The decoder is a device that is responsible for converting the digital signals in the computer into analog signals needed for speakers, amplifiers, amps, and headphones. It is used to provide better sound quality than the sound card. Some decoders also have USB. Auxiliary parts such as digital sound card and headphone amplifier circuit.
First of all, the following explanation only discusses the core playback part of the sound card and the core decoding part of the decoder, because these two parts are the most corresponding, many independent sound cards also have a recording input part, a headphone amplifying circuit part, etc., and there are many decodings. The device is equipped with a USB digital sound card that can be directly connected to the computer with USB. There are also many decoders equipped with headphone amplifier circuits, which can push headphones, and so on.
The core playback portion of the sound card is compared to the core decoding portion of the decoder:
The core playback part of the sound card consists of the main control part and the digital to analog conversion and analog output parts.
The main control part consists of one or more chips, called the main control chip or the main control chipset. It is responsible for the connection and communication with the computer, and controls, coordinates and controls the whole sound card. It is the backbone of the sound card.
The digital to analog conversion and analog output sections are digital to analog conversion sections of digital to analog conversion chips or CODEC chips (codecs, which are digital to analog conversion and analog to digital conversion functions), and chip out to output insertion The analog output circuit between the holes is used to convert the digital signal in the computer into the analog signal finally required by the speaker speaker and the earphone speaker to emit sound. The conversion of digital signals to analog signals is an indispensable and inevitable task in electronic audio playback, and must be done.
A separate decoder came into being. In fact, the two-channel decoder should not be called a decoder. This is just a habitual name. It should be called a "digital to analog converter."
The purpose of the decoder is to convert digital signals to analog signals.
The core decoding part of the decoder consists of a digital signal receiving part, a digital to analog conversion and an analog output part.
The digital signal receiving part is the gateway of the decoder, which is responsible for welcoming the received digital signal, doing some translation, and then handing the signal to the following digital to analog conversion and analog output part.
The digital-to-analog conversion and analog output sections are identical to the sound card above, and the structural principle is the same, and the same work is done. It is used to convert the digital signal in the computer into the analog signal that the speaker speaker and the headphone speaker need finally to make a sound.
Here you can see that, in fact, the decoder is doing the same job as the core playback part of the sound card, so why do you need a decoder?
Because the decoder:
1, large space, you can install more components to form a more complex and complete circuit
2. It can install precision switching power supply or transformer. Compared with the PCI slot of the sound card, the power supply is good, the power supply quality is high, and the voltage is stable and accurate. Electricity is like food, water, and air. It has a great impact on the sound quality of sound cards and decoders. Just as people eat unclean things, they will diarrhea. If the voltage and decoder are not accurate or unstable, the sound quality will be greatly reduced. It will not work properly.
The sound card is limited by the size and power supply.
Therefore, the decoder's sound quality is better than the independent sound card, can achieve better sound quality than the sound card, a good decoder can easily push the independent sound card beyond the clouds.
So, what is the difference in use?
The sound card can be directly connected to the computer, and then connected to the speaker, amplifier, amp or headphones.
The decoder requires a sound card to provide him with a format-compliant digital signal, generally in SPDIF format (coaxial or optical fiber), professional AES/EBU and ADAT formats, and Lezhibang also independently developed the MULINK format. This sound card is either a general onboard integrated sound card or a stand-alone sound card installed on a computer, or is installed in the shell of the decoder, and is integrated with the decoder, and can be directly connected to the decoder by USB.
Different sound cards are connected to the decoder, and there will be different results, because the digital output quality of different sound cards is different, and the performance is accurate, that is, the difference between the signals output by different sound cards and the ideal precision signals without distortion is Different. A digital output sound card is closer to an undistorted ideal signal. The accuracy of integrated sound cards is generally poor.
Because the sound signal is different from the general digital signal. Generally like a document, a picture, their content has nothing to do with time, one bit of 010101 is correct, the data is correct. But the sound is not, it has a strict relationship with time, it has a clear playing speed and rhythm with the passage of time, and the audio data in the computer is recorded as a data point (sampling point) every other time. form. During playback, there is a time signal in the computer to command (generally the crystal is used to send this signal), each time a signal is played, a data point is played, and tens of thousands per second - hundreds of thousands of data points are connected together to become us. The sound that I heard. Then the problem comes. The components that provide time, such as the crystal oscillator, can't be absolutely accurate, there will be errors, just like the clock goes fast or slow, or a little faster, a little slow, then, between the data points The interval will also change, causing the time-base jitter error (Jitter) that people often say. Good sound card, decoder, and many technical points are placed here to improve the accuracy of the clock signal, thus improving the sound quality. More audio and video knowledge, all in the home theater network (), WeChat: cnhifi.
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