🚀 go-pugleaf

In article <C0F8Hp.84n@ve7frg.ampr.org> doug@ve7frg.ampr.org (Doug Collinge - VE7GNU) writes:
>If my CD with a "1 bit DAC" and the aid of "8 times oversampling"
>can produce audio as good as an older CD with no "oversampling" and
>a 16-bit DAC then can my circuit with an 8-bit DAC be replaced
>with a 1-bit DAC and 4-times oversampling?

	Welcome to marketing buzzword confusion hour.

	A "1-bit DAC" is a sigma-delta D/A converter, and if
you want to use it for CD output, it has to be 16-bit capable.
Because, the input to it will be a 16-bit number, more than likely.

	There are no CD players that have 'no oversampling';
perhaps an early multi-kilobuck unit or two with no oversampling
were produced, but I've never seen one.  The first inexpensive
CD players ($500 and under) were all 2x oversampling, and required
modest hand-trimmed filters.  4x oversampling units don't require
any hand-trimming of the filters (perhaps simply selected components),
but the NON-oversampling units would have required immense, elaborate,
twenty-adjustment-knob filters (not feasible in mass production,
and NEVER inexpensive).

	An eight-bit DAC is rarely linear to 16-bit precision,
and will not successfully reproduce CD sound.  The 'one-bit'
approaches ARE intended to be linear to that full 16-bit
precision.

	John Whitmore