The main features of digital audio

1, high signal to noise ratio

The digital audio recording format is a binary code, and it is only necessary to judge "0" or "1" during playback. Therefore, the noise of the recording medium has little effect on the signal-to-noise ratio of the reproduced signal. The analog audio recording format is a continuous sound signal, which is affected by noise such as tape during the recording and playback process, and is superimposed on the sound signal to deteriorate the sound quality. Although noise reduction measures are taken in the analog sound, it cannot be fundamentally Eliminate it.

2, low distortion

In the process of analog audio recording and playback, the nonlinearity of the head introduces distortion. Therefore, measures such as AC bias recording must be taken, but the distortion still exists. In digital audio, the magnetic head only works in the state of magnetic saturation or non-magnetic, indicating 1 or 0, and there is no linear requirement for the magnetic head.

3, good repeatability

The digital audio equipment is copied and reproduced multiple times, and the sound quality does not deteriorate. In the traditional analog cassette recording, the noise recorded on the tape is increased every time it is re-recorded, so that the signal-to-noise ratio is reduced by about 3 dB for each dubbing. The sub-band is not as good as the master tape, the sun band is not as good as the sub-band, and the sound quality is successive. Deterioration.

4, small jitter rate

The digital sound reproduction system functions as a time base correction circuit, and the rotation system and the instability of the drive system do not cause chattering, so that it is not necessary to require a precision mechanical system like that in the analog recording.

5, strong adaptability

The digital audio record is a binary code, and various processing can be performed as a numerical operation, and the hardware can be operated without using hardware, and it is convenient for microcomputer control, so the adaptability is strong.

6, easy to integrate

Due to the digitization, it is convenient to use ultra-large-scale integrated circuits, and the whole machine is convenient to debug, stable in performance, high in reliability, convenient for mass production, and can reduce costs.