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Tag Archives: pro audio
speaker audio quality and power is not directly related
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speaker audio quality and power there is no direct relationship. Power decision maximum sound speakers that
can be issued, feels like all the speakers the sound of how shocking. Accordance with international
standards, the power of the two marking methods: rated power with instantaneous peak power.
The former refers to driving an 8Ω speaker to the provisions of the waveform continuous analog signal, after
a certain interval and repeat a certain number of times, the speaker does not occur any damage to the maximum
electric power within the rated range; The latter refers to the speaker a short period of time can withstand
the maximum power
Line array speakers use techniques
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Line array speaker\\ s use of technology: First, what is the goal of high-quality sound system? Provide clearly defined, from seat to seat as consistent as possible frequency coverage. However, traditional methods of speaker group, the interference due to the interaction between the speakers, to achieve this goal, there are inherent limitations.
Provide better sound quality (less comb filtering), better coverage, more efficient use of amplifier power system.
Car speakers
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car audio lead the most fundamental condition – playback sound. Sound system, at least you want to include the following points are raised, to be eligible as sound alike, that any sound system, car audio is no exception.
Car audio installation dimensions and mounting techniques
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The vast majority of cars on the stereo installed in the dashboard or the location of the sub-dashboard, while the narrow space within the dashboard, the volume of car audio console is bound to be limited on a common mounting holes standard size, called the DIN (German Industrial Standard) size. The standard DIN size 178 mm × 50 mm × 153 mm (length × width × depth). Some more advanced car audio console with multi-disc CD audio system, mounting hole size of 178 mm × 100 mm × 153 mm, also known as 2 times the DIN size, more common in the Japanese machine. Individual brands of car audio console is a non-standard size, can only specify to install certain types of car audio. Therefore, the purchase of car audio, must pay attention to the audio host size and the instrument panel mounting hole size whether adaptation.
Car audio installation in addition to the instrument panel mounting hole size, more importantly, the entire sound system installation, especially the speakers and mechanical installation techniques. Because the pros and cons of the sound of a car, not only with the sound quality of relations, also has a direct relationship with the sound installation techniques.
An overview of the audio installation techniques on the overall effect
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Ktv sound more often only know to appreciate, but have forgotten how to install, because the installation is not good, the overall effect of that sound will not be perfect, install audio also need some tips. Like to share with you the next Xiaobian 6 Click Install the sound you need to know!
An electronic device, otherwise it will malfunction. There must be specially trained personnel to install, in order to ensure security.
Disassembly technology: audio-conversion process, the original car stereo removed, whether disassembly is a modification of the fundamental problem, because now dashboard surface can not see the screws, so it is necessary to pry open the decorative parts to see the screws, the demolition operation requires professional and strict, or easy to dismantle bad. The second step, a wiring, dress speakers, it is necessary to removable door panels, door, dashboard, seats, decorative plates, in the disassembly process, the need for special tools, to keep the original intact, otherwise it will not pretty and sealed well to produce noise.
3, whether the product is qualified: many counterfeit brand-name equipment, at the time of purchase must distinguish now on the market, otherwise no end of trouble. Some inexpensive equipment, from the appearance is not out of the quality problems, however, the inner components are inferior, the circuit is designed to not meet the standards, poor sound quality of this equipment do not say, it is prone to failure. even produced naturally. Must be factory authorized shops to buy, to ease of use.
4, how the sound quality? Not buy brand-name products will certainly be nice, brand-name plant varieties can be divided into high, medium and low grade buy is not necessarily nice, the most fundamental work by a professional system, installation and commissioning, to good effect . Not a simple matter of a few lines casually connected, the sound field positioning, phase can not be wrong, otherwise the effect would be disastrous.
5, taking into account the after-sales service: car audio is in motion, environmental degradation slightly, such as: temperature, humidity, vibration, dust, easy to make the sound to produce a variety of failures, maintenance, warranty and maintenance is a very important issue. Cheap parallel imports to buy, renovate and clearance products, theft machine, the warranty card is false, there is no after-sales service, once the damage need maintenance fees, or scrap, whether it is worth. Now store the sale of the equipment is not necessarily expensive, a lot of cost of good equipment, you can enjoy good service, why not.
6, the installation environment: installation of some shops in the open air, and the staff\\ s uniforms dirty, sound installation finished, but the interior of the car and the car looks dirty. Buy a new car sound change is a good thing, but to bring many negative consequences, is a sad thing. Specialty store in the indoor operation, and its benefits, clean, and ensure the car clean inside and outside. 2, independent of temperature, easy to damage when the temperature is too low when the demolition of plastic parts. 3, protected from the weather, rain, wind can work properly. Because of the lighting, so during the day, black day will work. 5, the customer has a good lounge.
These are the professional and non-professional technical difference, this is also the difference between high and low price of non-professional, and ultimately is a value concept, is to choose the price or option value. Do not install the audio as it is an easy thing, not a line to connect audio ring on the bin, not only the sound quality does not guarantee, as well as adverse factors and pitfalls in which, therefore the emphasis to go to a specialty store installation, can be guaranteed.
Several speakers sound
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The vast majority of speakers or traditional cone monomer before and after the movement sound more academic argument, the speaker called the electric Electrokinetic the Dynamic or Dynamic (Moving Coil). Seventy years, in addition to materials, continuous improvement, do you think the speaker technology really has improved? The following are several common speakers sound way: First, the moving coil. The basic principles from the law of Fleming left hand, a current line was perpendicular to the magnetic field lines into the magnet north and south pole, the line was by the interaction of the magnetic field lines and current movement to a diaphragm attached to in root Road line, with the current changes in the diaphragm to produce before and after exercise. More than 90 percent of the cone monomer are moving coil designs. Second, the electromagnetic. Erected in the middle of a U-shaped magnets can move to cut the plate (armature), when current flows through the coil, the armature will be affected by the magnetization of the magnet to produce the phenomenon of absorption denounced and driven diaphragm movement. The cost of this design but the results are poor, so the use of the telephone tube with a small headphone. Third, inductive. Similar to the electromagnetic theory, but the armature doubling on the voice coil in the magnet and asymmetric, when the signal current through two armature for different magnetic flux pushing each other and exercise. Electromagnetic is different is that the inductor can be regenerated at lower frequency, but the efficiency is very low. Fourth, the static type. The basic principle is the Coulomb (Coulomb) law, usually in the plastic quality of the diaphragm with aluminum vacuum vaporization of inductive material handling, two diaphragm placed face to face, which is a plus positive current hypertension, another piece will be sensitive a small current through each other to attract repulsion to push the air can sound. Electrostatic monomer due to the quality of light and scattered small vibration, so it is easy to get crystal clear treble, bass move the skills needed, but it\\ s not efficient, the use of DC original and easy to gather dust. Has successfully developed static and dynamic hybrid speaker, to solve the problem of insufficient electrostatic body bass, the headphones use of electrostatic is also very extensive. Five planar. The first design developed by the Japanese SONY voice coil design is still moving coil as the theme, but the cone diaphragm into a honeycomb structure of the flat diaphragm, because few people empty effect, better features, but the efficiency is low . Six, ribbon type. Traditional voice coil design, the diaphragm is very thin metal, the direct current flowing into the Dao to vibration pronunciation. It is the voice coil diaphragm, so the quality is very light, occasional return should be excellent, high-frequency response is also very good. However, the efficiency of ribbon speakers and low-impedance amplifier has been a great challenge, the Apogee can be represented. Another way is the voice coil, but the voice coil printed directly on the plastic sheets, so you can solve some of the low impedance, leader in Magnepang such design. Seven and a horn. Diaphragm to promote in the horn at the bottom of the air, because the sound transmission is not diffusion efficiency is very high, but because of the shape of the horn length will affect the sound you want to replay the bass is not easy, now mostly used in the giant PA system or tweeter. Eight other Dr. Hale ribbon development in 1973, improved design, known as the sea-ear speaker, very good in theory, Taiwanese users are very rare. Piezoelectric titanate piezoelectric material, coupled with the voltage to stretch or shrink the pronunciation of design, the Pioneer once high polymer modified piezoelectric design with their tweeter. The ion speaker (Ion) is free of charged molecules will use high-pressure discharge air quality of the charged only impose AC voltage due to the vibration sound can only be used in high frequency above the monomer.
Speaker headphone entry talk headset speaker
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In the previous section, we took great lengths to explain the technical characteristics of speakers with electric speakers [the pros and cons], on the sound principles of the speaker, headphones electric speaker and the speaker does not have any difference, but Because the use is not the same, so the technical requirements are not the same, this talk on a headset with speakers.
Headset speaker also called the drive, electric speaker sound principle, also called habitual moving coil speaker. Its design must meet the small-diameter, lightweight needs. Otherwise can not be installed to the ear shell.
Requires both light can not harm the performance of Nd-Fe-B has become the preferred material of the magnet, it has a very high flux density up to ferrite 7-14 times, a normal headset NdFeB magnets, you can easily adsorption from the objects of weight a few times.
Most of the headphones is not divided by design, it is actually a full-band speakers are responsible for a very wide frequency response, this is not an easy thing. To achieve the full band sound of a single diaphragm, the diaphragm needs to be done very light thin and there is a certain intensity, speakers with diaphragm almost failed. Moving coil speaker diaphragm, the thin PVC material specific formula manufacturers confidentiality], the thickness of the thinnest can reach a few microns, in order to enhance the diaphragm strength, the diaphragm is generally suppressed to strengthen lines, which can improve the high frequency response, and the split vibration to produce a certain deterrent effect.
The structure of the cone speakers, fold ring and centering piece is used as a suspension system, dome speaker diaphragm repression fold ring suspension, moving coil loudspeaker suspension system, but with the diaphragm have been integrated, this dome speakers are very similar, basically, can be dynamic speakers as a derivative form of the dome speakers.
The voice coil is also key, because it must be very thin diaphragm, voice coil weight will impact on the working status of the diaphragm, copper voice coil weight heavier, more CCAW Voice Coil CCAW Voice so-called Copper- CladAluminumWire, Chinese as aluminum, copper-clad wire, it effectively reduces the weight of the voice coil. This voice coil of the speaker using the speaker application, but the scope of application is relatively small point.
Headset design, there is a speaker, after all, common, that is, moving iron speakers, it\\ s very small, so much for which the design of the ear headphones. Speakers using the speaker in a similar type, called the electromagnetic speaker, or call the speaker of the reed. Moving iron speakers can be regarded as a derivative of the electromagnetic speakers simplify varieties.
Moving iron speaker power, drive a U-shaped iron plates, conduction to the shell sound, its sound principles and dynamic speakers. This type of speaker of the biggest advantages is the high sensitivity in the early period for hearing aid design, widely used in-ear headphone design in recent years things. Moving iron speakers also have a greater disadvantage of the performance of the frequency response is not enough, the sound of the metal taste is too strong, However, as technology advances, these shortcomings have better improvement.
In order to overcome some shortcomings of the moving iron speakers, and some high-end models and custom headphones, multi-speaker plus the divider to achieve a more perfect frequency response, such as Ultimate Ears the UE 7 Pro, with two woofer, a tweeter, which are located in two separate cavities. The earplugs interior design divider, high-frequency, low frequency via the two catheters output, reverb in the ear canal. This is somewhat similar frequency of the speaker and the multisection.
Headphone speakers did not use the special features on the principle, in front of the introduction of large format on the speaker, also applies to the headphone speakers will not repeat it here, but special headset applications, will lead to the design of the headphone speakers by volume, weight , etc., constraints, design space is small. Headset design for a class of flat-panel electrostatic loudspeaker applications, but few in number, not as a basic knowledge of science, interested can read the relevant technical information.
How to choose a good quality speaker
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How to choose a good quality speaker
How to choose a good quality speakers, the sound is often reflected in the contents of the clear, specific and objective, but the sound quality and sound is extremely abstract, subjective and inconvenience to the exchange. So how can we choose a speaker does sound good, you tell us about it below:
First; clear and cloudy, audio sound system is felt to be clear and uniform frequency response to a wide, especially in the high frequency with density, reverberation due to better distinguish the sound of musical instruments and position, whereas it called turbidity.
Second; round and hairy, round is the distortion, especially in small high-frequency distortion sound, these sound feeling happy, sweet. Bass is not muddy, not blunt tenor, treble is not harsh. Hairy and relatively mellow, voice of the main feeling is rough, there is audible distortion. Five percent if the sound distortion, most people have scared feeling. Professionals can hear thirty percent.
Third; full voice thick with dry, loudness large, medium and high volume of good sense, reverberation than enough, good transient response is called full, otherwise it is dry.
The fourth; bright and dark is the bright area in the whole sound of high, medium and bass on the basis of balance, treble slightly prominent, and is rich in harmonics, reverb moderate distortion. Refers to a serious lack of dark alt, bass relaxation, resolution of a difference.
Fifth; broad and thin wide sound frequency response is good, to sound bright enough bass, thin sound is often a lack of bass or treble.
Sixth; dry and wet, mainly refers to the reverb. Reverberation time is short, deep enough, the performance of dry. Reverb too, showed mixed, sometimes wet and dry sound determined by the software, but also caused by the listening environment.
Seventh; sense of sound is the sound bright, spread well and has some reverb, especially within the 800-5000 HZ sound more dense, the effect of the nearest concert hall, called the scene a sense of good.
Eighth; balance, wide frequency range, especially the access frequency of each unit speakers smooth, no bump, the integration of voice, broad, it sounds easy, pleasant, called balance.
Ninth; warm sense of well-being of the sound have a greater sense of individual differences. Cold voice distortion is extremely small, very balanced, good equipment, the physical indicators. The warm sound is the sound balance, distortion, based on smaller, more with some of the mellow, full of personality. Generally use some of transistor amplifier sound cool, warm tube there are charming. The sound of ice and warmth is not a derogatory term, which sound preference varies.
Above to introduce you to choose speakers that we should pay attention to the problem, you can refer to the time of purchase.
Car Audio Tips
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Car Audio Tips
The reason can be called a car audio system car audio, the most basic condition is that – there are sound playback capabilities. Car audio system, must contain at least the following points to be eligible as car audio, car audio systems that are any natural.
1 Software and the Media: What you want to listen? Traffic conditions of the program? Then you have to open radio stations, and transferred to the correct channel. Want to watch TV in the car? It is more simple, the LCD screen has long been one of the leading car audio systems, and even if you want to see DVD is the same. Listen to music? Your favorite album put a bar, whether it is CD, MD, cassette, which is just inside the singer s collection of songs, you like Liu Jialiang, I want to hear Hit-Pop, who put the album will come to hear it, buns bread differ from each other.
2 source: Multimedia software can decode the body, that of the source. This terminology may seem difficult to understand, in fact, very simple thing! Broadcast radio tuner called, commonly known as the radio; play called cassette audio cassette seat; The play CD album, called CD-Player, but also for compact discs – easy!
3 pre-signal control: Simply put, the first level is the level in the post, we will generally be called after the amplifier stage, so in between the sound source and amplifier, all the parts for the music signal processing, are known as pre- . For example, the host car audio volume control, is part of belonging to the former class, which controls the signal strength is the degree. Other audio equipment, the more often see some of the top-level control, as well as treble and bass adjustment, left and right balance, before and after volume adjustment, and Loudless loudness control. In addition, there are more complex audio equalizer (EQ), its function and bedside sound often seen with multi-frequency tone adjustment, the screen will display a different pattern of the same functionality. In addition, the digital sound processor (DSP) is now standard on many hosts, simply to say that simulate sports, dance or concert hall the sound features such as space. All in all, all about signal processing or adjustment of the institutions of the former class.
4 power amplification mechanism: the first level control most of the voice signal intensity are only a few volts, enough to drive the monomer (see section 5), so the signal must eat, \"Dali Wan,\" so that the signal strength stronger, so that it can watt (W) to calculate, so the success rate of the output signal to strengthen institutions, called the power amplifier, which is commonly known as the amplifier. In general, the total car audio system output value, which is all the amplifier system and the output power, have been used as a car audio system in the size of the series on the classification.
5 Speaker: mechanical sound waves into electrical energy is called the speaker. Perhaps the reader has to guess the speaker is commonly known as the horn! Right … … only half the story. Can signal into a sound body, in addition to the general common round or oval back and forth to the moving coil speaker monomer, there are other types of speakers! For example, with the sound of metal ribbon type (Ribbon), driven by electrostatic diaphragm planar electrostatic speakers, are also in place in the audio. But in car stereo moving coil speaker is still the mainstream, the impression that in addition to the United States and Taiwan EVIL Infinity-style vehicle with ribbon tweeter, other are common moving-coil monomer.
6 transport sector: a complete car audio system, a combination of wire components is essential, but the wire is often easily overlooked. In fact, wire good or bad, will directly affect the sound quality, because the wire from the material, stranded structure, the diameter of the insulation resistance value with the specifications on the design and so different, will affect the signal or power transmission. In the use of wire, due to the different needs of different equipment design-oriented wire, such as power, ground, start signal, horn, fiber and wire required for a particular system, are due to their different requirements on the design the difference. For example, the sound quality of speaker cable required, the purity of the material must be as high as possible, otherwise too many impurities will affect the sound full play. In addition, between the wire and terminal equipment is also very important contacts a solid or not, the contact area the size of the joint design and material, and ground is good, will have a significant impact on the sound effects.
Among the host is currently commercially available, many already have a source, pre-and post-class, include the audio form the basic structure. Why do I say? You see whether the host has single-disc CD, tape deck or radio? At least one of the different bar! That is, source friends. Look at car audio host, is not the size of the volume can be adjusted, but even the most low-end host has to adjust the treble and bass sound right! That is a first grade. In addition, the host is not there most of the output power it? If the car audio system, the speaker is pushed directly to the host, then the host must be included in a power amplifier, such as the common modified the original host or hosts will have most of the power output. The host did not have a built-in power amplifier with output, commonly known as the host of this dumb machine, only the signal output only. Do not think that the host would be more expensive, in fact, most of the dumb machines are among the most advanced flagship, as it will use the dumb machine will be installed car audio amplifier, so the internal parts of the host material is more advanced, the line structure of the walk more complete, so the price is also the most expensive!
Aspects of the power amplifier, if accompanied by sound adjustment, electronic crossovers, equalization, or other functions of the model parameters, it contains pre-and post-class two parts, that is, multi-purpose amplifier; if only purely for power amplifier the aircraft, that is only part of the after-class. If it is the speaker? Needless to say, after it is pure class. Even includes a passive crossover, only tailored for the speaker components, although it is also a control signal frequency and tone adjustment, but it still belongs to a part of the speaker system. Next time you see any one car audio equipment, you can self-analyze it! Car audio system size is, some people will think that his car filled with car audio really simple, and so it can be called the car stereo? I think if you complete the above conditions, you can specify the issue or you want to hear the sound, it can be called car audio, even if the host with the original equipment is only a few speakers. Conversely, if a there are several sources, many of the large Department of amplifier volume control system was not able to listen? If no speaker can sound it? Even if such a system the size is bigger, more equipment, do not be a car stereo.
Little careless car audio conversion
The size of car audio systems, depending on the individual requirements for sound quality. Whether your car sound system the size of the car, next time when you open the car s sound, as long as you want to listen to the music provided for your listening enjoyment services, is the most perfect car audio system.
But when you select a sound, the best brand to buy a package, it will not only have quality assurance, and product specifications must be very detailed and will guide you how to properly use, will avoid the embarrassment of using the wrong .
AV the role and specific functions of amplifier
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AV amplifier Knowledge entry – Features – Category articles: AV amplifier described in detail the role and reception of image and sound signals and other functions of knowledge. The following order by the purchase shopping network, available to you for reference.
AV amplifier s role and specific functions
Home theater systems AV amplifier is the control center. It needs to do many things, from the selection you want to listen to audio and video sources, up to amplify the sound signal to speaker-6/">drive speakers. Its role is very familiar with our stereo is very similar, but quite a number of differences. Stereo and AV amplifier can source in the different programs to choose between, you can control the playback volume, you can amplify the sound signal to drive speakers, however, AV amplifier has three unique features, is the stereo power amplifier does not have:
1), the surround sound signal to some form of decoding;
2), dealing with multi-channel (stereo amplifier rather than as only handle two-channel);
3), with the image signal input ports and output ports. The diagram shown. Another major role of the AV amplifier, is from the LD discs, VHS tapes, DSS signal or a DVD disc pick up the sound signal to decode. The so-called decoding equipment is picked up from the original sound source signal, converting them to left, right and left surround and right surround several analog audio signal. Finally, AV amplifier is also equipped with a 5-channel power amplifier inside, to the analog audio signal amplification, to drive home theater speakers.
AV amplifier brands, they are in performance, features and flexibility of use are not on the same, but in order to complete the same tasks, have specific functions such as these:
● receiving equipment from various sources (LD, VCR, DSS, DVD) picture and sound signals, select the desired signal, the images are sent to the monitor and speakers (this function is called the program source switching);
● According to the sound signal encoding format is Dolby Surround, Dolby Digital or DTS, the sound signal corresponding to the original surround sound decoder;
● pick up AM and FM radio signals;
● Adjust the volume;
● Adjust the initial setting system performance, for example, fine-tune the level of each channel;
● the bass delivery to the appropriate speakers and subwoofer (called bass management);
● the THX processing (when dealing with this circuit);
● After the 5-way signal amplifier to send drive left, right, left surround and right surround speakers.
Now, we have the program source selection, input and output port, surround sound decoding and amplification, etc. are described below:
Select the program source
In the home AV system, AV amplifier from a variety of programs to receive the first source of sound and picture signals. In this way, you can freely choose one program source, the signal it sent to the monitor speakers and images, enjoy. To do this, you only need to press or click on the amplifier panel a button on the remote control. At this time, there are often displayed on the panel, telling you what is currently selected program source; in some machines, it may be appropriate selection key next to the occurrence of light.
AV amplifier has many different brands and models, different models, they are able to connect the program source is not the same number. For example, some AV amplifier can be connected to two AV sources (sound and picture signals) and an audio signal source (eg CD player), then there is a group used to connect recorder (VCR) program source. And some AV amplifier, AV source can be connected to four, plus two sets of two recorders can be connected to the AV program source, etc.
Input and output ports to connect any one AV amplifier, equipped with only two groups fed Tone frequency signal input port; a CD player for the same connection, the other is for connection with the recorder. If you intend to ordinary phonograph (LP) connection, then, AV amplifiers should have a labeled \"PHONO\" input jack of the word.
AV amplifier all the audio input and output ports, use the RCA jack (commonly known as plum socket). Video port, RCA jack be useful, but also useful for the newer S-Video socket; the former is used to input composite video signal, which is used to input chrominance signal and luminance information has been separated from the video signal. Use S-video cable, DSS is only when the program source decoder box, DVD player and with S-VHS (High Definition Video Recorder) playback high-definition video (relatively rare), you will have a better effect. If the program source is the DSS receiver, DVD player or high-definition video recorder, then buy it with S-Video input and output sockets for AV receiver, will be able to obtain a higher quality picture. Of course, if the advantages of S-video connection to play out, you must also have the image monitor S-video input jack. In many AV amplifier, equipped with both composite video and S-video signal socket outlet available to you.
There are five groups of AV amplifier output terminal, used to power amplified audio signal transmission to the speakers. These five groups corresponding to the output of the left, middle, right, left surround and right surround channels 5. There is also a group of sixth output terminal, next to the printed \"SUBWOOFER OUT\" logo, designed to connect a subwoofer (you can not answer). The other five groups speaker output terminals are connected strong signal, this group of output terminals of the subwoofer output is low-level signals, but also requires a separate amplifier to be amplified. Most subwoofers have been equipped with an internal amplifier, it can be this low level subwoofer signal is fed to it directly.
AV amplifier s video output port, marked \"MONITOR OUT\" (the monitor connector). It is the role of the input video signal fed to the amplifier s image monitor. Amplifier regardless of what video source is selected, video signals are output from this port. This monitor is connected with the image port, which can be composite video signal output jack, it can be S-Video output jack; in some of the AV amplifier, you also installed the two sockets.
Installation of two video input and output sockets of the AV amplifier, the use must pay attention to a problem. If you put a program source with an S-video cable to connect your AV receiver, but the monitor is connected AV amplifier with image Shique using the composite video cable, then you will not see on the monitor image. In the program source and AV amplifier using S-Video connection between the AV amplifier and an image monitor must be used between the S-Video connection.
AV amplifier there are different types of the other three ports. Although they are used to input digital audio signals, but require different types of signals. This connection is to be careful, do not mistake. The first digital input port for receiving Dolby surround sound. This is a two-channel digital audio signal encoding, almost all of the LD disk are loaded with these signals, called PCM (pulse code modulation, a digital audio signal encoding) channel. Many laser disc player is equipped with a digital output terminal, if the laser disc player s digital output directly to the AV amplifier is connected to the digital input, this time due to the laser disc player around in the digital-analog conversion circuit and AV in The analog-digital conversion circuit, the resulting sound quality is better. In good quality AV receiver, most are in the digital domain Dolby Pro Logic decoding, that is, dealing with 1 and 0 signals. Digital connection, you can make the laser disc player and AV amplifier connected between the more direct. The other two digital audio signal input port, not to accept the PCM digital audio signal. One, next to the can labeled \"AC-3 RF\" word is used to input read from the LD drive the RF modulation, \"Dolby Digital\" signal. What kind of rest, without modulation is used to enter the \"Dolby Digital\" bit stream, such as the DVD player to output such a signal. In some AV receivers, the two \"Dolby Digital\" input ports into one, the machine can be modulated signal is sent, \"Dolby Digital\" or non-modulated signal, \"Dolby Digital\" signal, automatic conversion to complete the corresponding decoder. In some models, that enter the non-modulated \"Dolby Digital\" signal port can accept PCM signals, the machine will automatically signal in between these two forms of conversion.
It should be noted that the Dolby Digital surround sound signal RF modulation, is only a transitional measure, in order to facilitate the Dolby Digital surround sound recording in LD disk. However, the use of Dolby Digital surround sound audio and video sources (such as DVD and DSS), the output of all \"non-modulated\" or \"bit stream\" Dolby Digital surround sound signal.
Surround decoding
AV amplifier In addition to selecting the video source you want to enjoy, but also to decode the surround sound signal. Where almost all of the AV amplifier are installed Dolby Pro Logic decoding circuit; relatively new machine, you also have a separate channel Dolby Digital and DTS decoding. Typically, the universal AV receiver can only decode Dolby Pro Logic surround sound; in higher-priced products, the separation was equipped with digital surround sound format decoder. However, the low-cost receivers are now starting to have this decoder.
Dolby Pro Logic surround sound decoding signals, there are two ways: one is to decode the analog signal, a digital signal is decoded. If your AV amplifier is digitally Pro Logic decoder, a digital input jack, you can put player s digital output to your AV receiver in Pro Logic decoder is directly connected.
Power amplifier
AV amplifier has better amplifier to amplify the sound signal, the final drive home theater speakers. It is only with the two amplification stereo amplifier (left and right) of different, usually has 5 amplified channels (Left, Center, Right, Left Surround, Right Surround). Amplifier rated output power is the wattage per channel to represent, varies widely between different machines, low-only about 25 watts, high 150 watts.
Most of the AV amplifier, the power available for the front channels for the surround channels available than the larger. For example, a marked in the front three channels each provide 70 watts of power, AV amplifier, two surround channels to each one may provide only 35 watts. Reduced to two channels provide the power behind the possible reason is that home theater sound in the total output, two surround speakers emit sound is supposed to be released than the previous three speakers sound small. In addition, when using the Dolby Surround format, the surround sound box of the drive signal frequency response has been compressed, only from 100Hz to 7000Hz, 20Hz to 20,000 Hz, not from the entire audio bandwidth; surround speakers do not have to replay the bass, So you can use less power amplifier to drive.
Since Dolby Surround format products sold in the market has been dominant, manufacturers of power designed to surround the smaller, it seems nothing wrong. However, when the Dolby Digital and DTS surround sound formats since the advent of surround sound formats, because they are full-bandwidth surround channels, manufacturers have started a new product to the AV amplifier 5 channel all offer the same great power . For example, high-quality AV receiver including Dolby Digital decoding, surround speakers to provide their power, usually with the front three speakers to provide power as large.
In addition, some AV amplifier manufacturers in the design of the central channel when the power is also very stingy. They mistakenly believe that, through the central channel of the signal than the left or right channel by a small signal. So they reduce the power of the center channel amplifier. However, as consumers become more knowledgeable, these manufacturers were forced to change practices, has been provided for the front three channels of the same size, or roughly the same power. In fact, home theater systems, the role of the central channel of the largest, almost all of the dialogue to be replayed by it, in addition to some of the music and many sound effects.