AV功放的作用和具体功能（The function and function of AV
amplifier）
The role of AV amplifier and specific features. txt upwind direction, more suitable for flight. I am not afraid of the million people to stop, I am afraid of surrender. You are one minutes angry and you lose 60 minutes of happiness. Busyness is a kind of happiness, let us have no time to experience the pain, rushing is a kind of happiness, let us really feel life on the ground, exhaustion is a kind of enjoyment, let us no time empty. Life is like "breathing" "Shout" is for a breath, "suction" is to fight for a breath. AV amplifier is the control center of Home theater system. It has to do a lot of things, from selecting the source you want to enjoy, to amplifying sound signals to drive the speaker. Its role is very similar to the stereo we are familiar with, but there are many differences. Stereo and AV amplifier can choose between different program sources, you can control playback volume, but also amplify the sound signal to drive the speaker, but, AV power amplifier has three unique features, is not the stereo amplifier:
(1) Decoding the surround sound signal in some form; 2 processing multi-channel (instead of only two channels like stereo amplifiers); 3 the input port and output port with image signal. Its schematic diagram shows. Another major function of AV amp is to decode the sound signals from LD, VHS, DSS, or DVD pic
kup. The so-called decoding is to pick up the original sound signal from the source equipment, convert them to the left, middle, right and left surround and right surround several road analog sound signals. Finally, the AV amplifier is also equipped with 5-channel power amplifiers, used to amplify
analog sound signals to drive home theater speakers.
AV amplifier brands are numerous, they are not the same in performance, characteristics and flexibility of use, but in order to complete the same task, have the following specific features:
Receive images and sound signals from a variety of source devices (LD, VCR, DSS, DVD), select the desired signal, send them to the image monitor and speaker (this function is called program source switch);
According to the voice signal encoding format is Dolby Surround sound, Dolby Digital or DTS, the original sound signal corresponding surround sound decoding;
Pick up AM and FM broadcast signals;
Adjust the volume;
Adjust the initial performance of the system, for example, fine tune the level of each channel;
Send the bass to the appropriate speaker and subwoofer (called Bass management);
Thx processing (when equipped with such a processing circuit);
The 5-way signal is amplified and sent to drive the left, middle, right, left surround and right surround sound speaker.
Now, we introduce the program source selection, input and output port connection, surround sound decoding and power amplification, etc.
Program Source Selection
In the Home AV system, AV amplifier first to receive from a variety of program sources of sound and image signals. In this way, you will be free to choose one of the program sources, send its signal to the speaker and image monitor, to enjoy. To do this, you simply press a key on the power amplifier panel or on the remote control. At this point, the panel is often displayed,
Tell you what program sources are currently selected, and on some machines, there may be bright lights next to the corresponding selection keys.
AV amplifiers have many different brands and models, and the number of programs they can connect to is different. For example, some AV amplifiers can connect two AV sources (sound and image signals) and an audio signal source (such as a CD player), and a set of program sources to connect to a VCR (VCR). Also some AV power amplifier, can connect 4 av source, plus two groups can connect two video recorder's AV program source and so on.
The input and output ports are connected to any AV amp, and are equipped with two input ports that are only fed into the audio signal, one for the CD player and the other to be connected to the tape recorder. If you intend to connect with the general record Player (LP), the AV amp should also have a A-level input
jack labeled "Phono".
All audio input and output ports on AV amp are using RCA sockets (commonly known as plum plugs). The video port is useful for the RCA socket and is also useful for the newer S-video sockets; The former is used to enter a composite video signal, which is used to enter a video signal that has been separated by the chroma signal and luminance information. The use of S-video cable, only when the program source is a DSS decoder box, DVD player and with S-VHS (High-definition video recorder) pl
ayback high-definition video (relatively rare), will have a better effect. If the program source is a DSS receiver, DVD player or high-definition video recorder, then, buy its s video input and output socket AV receiver, will be able to obtain a higher quality picture. Of course, to make the benefits of S-video connection come out, your image monitor must also have an S-video input socket. In many AV amplifiers, a combination of video signal sockets and S video outlets is available for your choice.
AV amplifier also has 5 sets of output terminals, used to amplify the power of the audio signal to the speaker. These 5 sets of outputs correspond to the left, centre, right, left, and right surround sound 5 channels. There is also a sixth output end, next to the "Subwoofer out" logo, dedicated to connect a subwoofer (also can not be). The other 5 groups of speakers connected terminals output is strong signal, this set of subwoofer output is low level signal, but also need a separate amplifier to magnify. Most subwoofer inside is already fitted with an amplifier, so you can feed this low level subwoofer directly to it.
AV amplifier Video Output port, logo is "Monitor out" (monitor connection end). Its role is to feed the input amplifier video signal to the image monitor. Regardless of the type of video source selected by the amp, the video signal is exported from this port. The port connected to the image monitor can be a composite video signal output socket or an S-video output socket; In some AV amplifiers, both outlets
connect to和connect with的区别are installed.
An AV amplifier with two types of video input and output sockets is installed, and a problem must be noted in the use. If you connect a program source with an S-video cable to your AV amp,
But when you connect the AV amp to the image monitor using a composite video cable, you don't see the image on the monitor. The S-video connection between the AV amp and the image monitor must also be used between the program source and the AV amp.
The AV amp also has three different types of different ports. They are used to enter digital audio signals, but they are different for the type of signal. This is to be careful when connecting, don't make a mistake. The first digital input port, which is used to accept Dolby Surround sound. This is a
two-channel digital audio signal, almost all of the LD disk loaded with this signal, called PCM (Pulse code modulation, a digital audio signal encoding mode) channel. Many laser disc players are equipped with a digital output terminal, if the digital output of the laser player directly connected with the digital input terminal of AV amplifier, it is better to get the sound quality by bypassing the analog-to-digital conversion circuit in the laser player and in the AV amplifier. In the

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