From:
>
> 1 bit systems operate in the 3 MHz sampling rate range, not 44.1 kHz.
>
> They could be getting the additional dynamic range (120 dB rather than 96 dB)
> by nonlinear conversion. Some of the earlier pre-DAT, pre-CD digital audio
> systems (and the audio system on early 8mm camcorders) used a nonlinear 12
> bit
> system. Essentially these systems say that up in the upper volume levels the
> step from one encoded audio level is small, but that at lower levels the
> steps
> are larger. This yields a wider dynamic range, and hence lower noise floor,
> at
> the risk of audible "stairstepping" in the lower level signals, since the
> larger change from one encoded level to the next is closer to being
> noticeable.
I think I've come across how they are doing it. Apparently there is a
4bit shift register. So there is a offset for the 16 bits transmitted.
That get's you a lot closer to 120 dB dynamic range.
They do specifically say it's linear. So, not a nonlinear system.
Walt
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"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
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