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An analog signal (in red) encoded to 4-bit PCM digital samples (in blue); the bit depth is four, so each sample's amplitude is one of 16 possible values (16 = 2 4). In digital audio using pulse-code modulation (PCM), bit depth is the number of bits of information in each sample , and it directly corresponds to the resolution of each sample.
In fact, it is possible to transmit only the sign and implied MSB for each sample with an average of only 3.65 bits per sample. This coding scheme is used to implement the "lossy" mode of WavPack. In the "fast" mode the output of the non-adaptive decorrelator is simply rounded to the nearest codable value for the specified number of bits.
Sample rate Bit rate Bits per sample Latency CBR VBR Stereo Multichannel G.711: companding A-law or μ-law, PCM: 8 kHz 64 kbit/s 8 bit 125 μs (typical) Yes No No No G.711.0: Lossless compression of G.711: 8 kHz 0.2–65.6 kbit/s 8 bit 5–40 ms No Yes No No G.711.1: MDCT, A-law, μ-law: 8, 16 kHz 64, 80, 96 kbit/s 16 bit 11.875 ms Yes Yes No No
CD audio, for example, has a sampling rate of 44.1 kHz (44,100 samples per second), and has 16-bit resolution for each stereo channel. Analog signals that have not already been bandlimited must be passed through an anti-aliasing filter before conversion, to prevent the aliasing distortion that is caused by audio signals with frequencies higher ...
ALAC supports up to 8 channels of audio at 16, 20, 24 and 32 bit depth with a maximum sample rate of 384 kHz. ALAC data is frequently stored within an MP4 container with the filename extension.m4a. This extension is also used by Apple for lossy AAC audio data in an MP4 container (same container, different audio encoding).
more sample rates (from 8 to 96 kHz) than MP3 (16 to 48 kHz); up to 48 channels (MP3 supports up to two channels in MPEG-1 mode and up to 5.1 channels in MPEG-2 mode); arbitrary bit rates and variable frame length. Standardized constant bit rate with bit reservoir; higher efficiency and simpler filter bank.
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A Sony PCM-501ES EIAJ LPCM Adapter on a Sony SL-HF360 VTR. The Sony PCM-1600 was the first commercial video-based 16-bit recorder. The 1600 (and its later versions, the 1610 and 1630) used special U-matic-format VCRs also furnished by Sony for transports, such as the BVU-200B (the first model of VCR optimized to work, and sold with, the PCM-1600 in 1979), [2] BVU-800DA, VO-5630DA, and the ...