Re: Alpha Micro...
The odd 44.1 kHz sampling rate of CDs:
1) Has to be more than twice highest audio plus a margin for a practical pre-filter to avoid aliasing.
2) Was to suit an adapter that fitted the digital audio into a video signal so that a Betamax could record the audio.
Stereo used 19 kHz for the 38 kHz DSBSC carrier pilot tone because it was deemed that an upper limit for HiFi was 15kHz to 18 kHz. The later 20 kHz HiFi spec is largely an arbitrary number and later digital audio used 48 kHz simply because it was higher and a round number.
Using 192 kHz ADC simply allows cheaper simpler filters and then DSP can easily downsample to 48 kHz. Then on playback interpolation to 192 kHz allows a cheap filter on the DAC.
Old AM audio TVs had about 10 kHz and FM Radio and FM audio TVs typically had up to 15 kHz. All of that sounded better due to decent sized speakers in decent sized wooden cabinets. The 4" satellite TV speakers are a cruel joke. A 6" driver is a minimum. Built in TV speakers are now terrible, yet few have external speaker sockets, you need a separate amp.