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February 8, 2017 - 11:07pm
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Digital Audio and "Digital RIAA"
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The reasons for RIAA encoding/compression are unique to the physical requirements of LP record mastering and LP playback physical issues, which do not exist with digital recording and playback.
From a technical standpoint, what you propose is more comparable to Dolby encoding/decoding, although that is quite different technically also.
I think that you will find that what you propose would not achieve the results you have in mind.
You know a Analog RIAA, amplifies higher frekvenses and lowers low frequences (at recording) Otherwise at playback...
Why do you see "The Digital RIAA" like a DOLBY thing?
Dolby, RIAA, etc. are forms of equalization; different specifics for different applications
There are various systems patented by Dolby Laboratories, but in general their goal is primarily to improve signal-to-noise performance in recording and playback, especially in tape recording.
One of the main reasons for creating the RIAA bass equalization is that you cannot physically record enough bass on an LP master to represent bass in music adequately, so the bass has to be reduced in amplitude to physically fit on the master and the resulting LP. The bass then gets amplified in the RIAA playback process by an extra amount that makes up for its de-emphasis in the mastering process and returns it to its correct level.
The bass that actually exists on the surface of an LP is at a severely reduced amplitude compared to the original music, so without going through an RIAA playback filter/amplifier there would be very little bass in the music.
The treble part of the RIAA equalization for LP mastering is similar to the Dolby systems, in that the treble is boosted above normal levels to increase the signal-to-noise ratio, and then when the LP treble is reduced back to its normal volume in the RIAA playback filter, that improved signal-to-noise ratio is maintained.
It's about the same? (are you trying to sell more LP?) a 10 bit 20 hz sine wave (with that amplitude) as it is, would ressemble, a 20480 hz 1 bit (with that amplitude) In sound volume!
They should actaully be of same soundvolume, and they probably will not sound the same, the 20480 hz sine tone would look like a square-wave.
If otherwise the "digital RIIA" was used it would more adequete, like 20 hz sinewave would be at something like maybe 5 bits and the 20480 hz sinewave would be 5 bits (of resolution) Definetaly more ideal.