Digital audio basic vocabulary

If the camera has audio connections, it is always a good idea to use them, even when also recording to a dedicated audio recorder. Think of the camera’s audio circuits as a basic two-track audio recorder. You won’t have the noise performance, frequency response, or control offered by even the simplest dedicated audio recorder, but camera audio provides a good backup and sync reference."
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Jon Tatooles, co-founder, Sound Devices, on recording multi-track sound for HD DSLR shoots
Sampling rates: 32k = basic DV cameras, 44.1k = CD, 48k = standard broadcasts, 96K = DVD audio
Bit depth
Waveforms
Audio meters
Mixing multiple audio tracks