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Re: Hello and a Sony PCM D100 question

Subject: Re: Hello and a Sony PCM D100 question
From: madl74
Date: Fri Jun 20, 2014 7:07 am ((PDT))
> Hi David,               Sony has two techniques, the first is noise shapi=
ng via "Super bit mapping" - this is used if the record bit depth is 16 bit=
 - basically uses noise shaping/dithering to shove the noise above 20 Khz.


Ah, but "super bit mapping" sounds much better than "dither". I don't know,=

but my guess is that the double A to D conversions are probably out of sync=

to get a better dither and less low level "gravel". Just a guess, but if
they were doing an identical job, one would be redundant. Do they use two 2=
bit ADC's for the second 16 bit conversions?

>  Why is DSD better?

Theoretically, it doesn't produce harmonic artefacts in tune with the
sampling frequency. Effectively the sampling rate is random at audio
frequencies. I've never seen any proof that it is better than 24 bit and
higher sampling rates as used in studio setups. Wild sounds are essentially=

"low-fi" at source, so I have no hangups using 16 bits and economical
digital sampling rates.

>  3.5mm sockets I don't consider as a "toy"

I've lost recordings from the 3.5mm jack coming out and they are prone to
crackle if moved, especially with DC on them as with PIP. I use balanced
land lines up to 200 metres long and balanced and floating XLR's are the
only way over distance. They go into an SQN mixer and then to my toy Tascam=

via the 3.5 line in.

"Toy" sounds pejorative, but with care you can get high quality if not high=

reliability from toy recorders.

David Brinicombe

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