Related Audio Attribute
channel, sample rate, sample bits, sample format, bit rate
The PCM obtained from audio sampling contains three elements: channel, sample rate, and sample rate.
channel
When people hear the sound, they can locate the sound source. By setting the sound source to different positions, a better listening experience can be created. If the position of the audio is adjusted with the image, a better audio-visual experience will be obtained. Effect. Common channels are:
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Two channels, stereo, the most common type, including left and right channels
2.1 channels, adding a bass channel on the basis of two channels
5.1 channels, including one front channel, one front left channel, one front right channel, one surround left channel, one surround right channel, and one bass channel, first used in early theaters
7.1 channel, on the basis of 5.1 channel, the surround left and right channels are divided into surround left and right channels and rear left and right channels, mainly used in BD and modern theaters
Next is a two-channel audio system.
Sampling rate
Audio sampling is the conversion of sound from an analog signal to a digital signal. The sample rate is the number of times the sound is collected per second and is also the number of samples per second of the resulting digital signal. When sampling sound, common sample rates are:
8,000 Hz – telephone sampling rate, sufficient for human speech
11,025 Hz – sample rate for AM radio
22,050 Hz and 24,000 Hz – sample rate for FM radio
32,000 Hz – sampling for miniDV digital camcorder, DAT (LP mode)
44,100 Hz – Audio CD, also commonly used in MPEG-1 audio (VCD, SVCD, MP3) Sample rate 47 250
Hz – Sampling frequency
48,000 Hz for commercial PCM recorders – for miniDV, digital TV, DVD, DAT, movies, and pro audio Sampling rate 50,000 Hz for 2,000 – 96,000 or 192,000 Hz digital sound
for commercial digital sound recorders
– DVD-Audio, some LPCM DVD soundtracks, BD-ROM (Blu-ray Disc) and HD-DVD (High Definition DVD) soundtracks The sample rate used by the audio track
2.8224 MHz: The sample rate used by Direct Stream Digital’s 1-bit sigma-delta modulation process.
