IDM Mailing Archive

There's been a lot of discussion on the frequency ranges that people can hear. There's one big problem with this and it's that most cartridges e.g. Stanton 500 & 600's have a frequency range of 20Hz to 20kHz. This is probably due to too much electrical noise at the low frequency end and limited by the mass of the stylus at the high frequency end. noise at This means that when you're out bouncing all night the low frequencies you think you're hearing are probably the vibrations of the floor due to the power of the speakers. I'm sure you could get a bigger frequency range from a CD-ROM player as it's possible to sample at up to ~45kHz.

On Tue, 16 May 1995, derek wrote:

quoted 13 lines There's been a lot of discussion on the frequency ranges that

> There's been a lot of discussion on the frequency ranges that > people can hear. There's one big problem with this and it's that most > cartridges e.g. Stanton 500 & 600's have a frequency range of 20Hz to > 20kHz. This is probably due to too much electrical noise at the low > frequency end and limited by the mass of the stylus at the high frequency > end. noise at This means that when you're out bouncing all night the low > frequencies you think you're hearing are probably the vibrations of the > floor due to the power of the speakers. I'm sure you could get a bigger > frequency range from a CD-ROM player as it's possible to sample at up to > ~45kHz. > > >

**** should be more soon with the release of 96 bit sampling ! ***

If you ask an audiologist, they'll tell you most adult human beings have hearing that rolls off somewhere between 16khz and 20khz, and that as they get older, their hearing rolls off even more. If you ask an audiophile he'll tell you his CD's sound different if you coat the edges with red magic marker, and that he can hear the difference between different brands of speaker wire. While you can't hear a signal at > 20khz, if one of sufficient strength is mixed with an audible signal, subharmonics and phase interference may produce audible artifacts. This is not the same as hearing a 30khz tone. There are two proposals to increase sampling rate & # bits per sample in digital audio that have some merit, but neither is made necessary by the need to transmit signals people can't hear. Increasing the sample width from 16 to 18 or 20 bits has the effect of increasing the resolution of very quiet passages. Increasing the sample rate beyond 44khz allows you to construct simpler filters to roll off the aliasing and other crap that creeps in over the Nyquist limit. Life is too short to waste on this sort of bullshit. Please stop this discussion or move it somewhere else. -- kent.williams@cadsi.com -- Can a filter sweep the noise floor? How to program computers: Sit still. Stare at Screen. Type. Repeat.