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Subject:Converting 16-bit 44hz mono wavforms to 8-bit 8hz mono
Posted by: t00le
Date:10/25/2000 7:31:00 PM

Hi.


I have a need to convert some 16-bit wav files to 8-bit due
to a PBX we are installing. When I do the conversion it
makes the 8-bit wav file sound like it was being played
from an old phonograph at the turn of the century.

Any ideas as to why the conversion is so nasty? I have
tried changing codecs and they all seem to have the same
effect.

I know it can be done since a co-worker had done it, but he
quit. :/

Thanks in advance!


John

Subject:Re: Converting 16-bit 44hz mono wavforms to 8-bit 8hz mono
Reply by: Rednroll
Date:10/25/2000 11:33:00 PM

First try normalizing the file which will give the best resolution
when converting to 8 bit. Then Try putting a Low Pass filter on the
waveform with the cutoff frequency at 4Khz. Then do the conversion.

Actually your sound is sounding like you described, well it should
because you shouldn't get any frequencies above 4Khz with an 8khz
sampling Frequency and 8 bit is really poor resolution also, and
that's giving it the graniness.

john wrote:
>>Hi.
>>
>>
>>I have a need to convert some 16-bit wav files to 8-bit due
>>to a PBX we are installing. When I do the conversion it
>>makes the 8-bit wav file sound like it was being played
>>from an old phonograph at the turn of the century.
>>
>>Any ideas as to why the conversion is so nasty? I have
>>tried changing codecs and they all seem to have the same
>>effect.
>>
>>I know it can be done since a co-worker had done it, but he
>>quit. :/
>>
>>Thanks in advance!
>>
>>
>>John

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