On 18.10.1999 at 14:25:35 [EMAIL PROTECTED] (Chris Wiles) wrote:
Hello Chris.
> 1. You can never have more than about 8Khz, mono, played back via a modem,
> over the telephone - so it this rate they will sound *quite* poor.
>
> 2. It depends on the sampling frequency of your modem. Unfortunately cheap
> Rockwall 'generic' modems have the *worst* ADPCM playback/conversion,
> resulting in the *worst* conversion from a WAV (or other sample format).
>
> A modem with a better ADPCM is the Pace and, even better (arguably the
> best), is the Solo, which plays back a 11000Hz, afaik.
> 4. The samples provided are 22Khz Mono WAV's and, if played back at this
> rate, sound fine. BUT when you convert them through your modem, they will
> convert *down* to the ADPCM of your modem, often under 8Khz! CD's play back
> at 44Khz, your modem plays back at 8Khz. See the difference? :)
First time I've sampled music for WilhelmTEL I've read the sound from CD
with CDDA over the SCSI-cable with 44.1kHz and converted it with some
programms down to 8kHz. The result was ugly and crackle. I have tested
this with more than one programm.
Then I put the audio-connector of my CD to my ISDN-Master II, later to my
Toccata, and sample the sounds with 8kHz. And the result was much better.
I thing, the problem is calculating the samplerate down with a programm.
If I ony reduce the samplerate to the half I have this effect.
When you know the exact samplerate of your modem and if you have a
sound-card, then play the sound with full samplerate and resample it
with your soundcard at exact the samplerate of your modem. I'm sure,
playing this samples with your modem sounds much better.
Greetings
Frank.
--
Frank Busse, Neuhofen/Pfalz, Germany
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