DMAS Design [SPDIF-Optical]

[Ferather]

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An upgrade for optical pulses, and PowerDAC's, both apply to the DMAS sound system.

Note: The total THD, THD+N for the main DMAS audio output should be extremely low (SoC mostly).
Conversion to power (main THD point) is done by each speaker (PowerDAC).

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[Ferather]

Here is a SFX digital filter (I got the idea from ferrite beads), it attenuates frequencies beyond the set value, which is set to 22kHz. Human hearing range is 20Hz-20kHz so 22kHz is above.
Digital sample rate divided by two, equals the maximum frequency it can represent (without aliasing), 44.1 = 22.5kHz, 48 = 24kHz audio frequency.

In an ADC situation (analogue to digital), if a DMAS was to support analogue, an analogue filter would do a similar job.
Oversampling allows the higher frequencies to be captured, then removed (down sampled).


Technically speaking, in 32 bit float terms, the attenuation should amount to 'silent aliasing' if any occurred.

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