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Article #1027Re: RS-232 for voice
From: Steve Sampson
Date: Tue, 01 Aug 1989 05:02
Date: Tue, 01 Aug 1989 05:02
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You can forget all about the amplitude! Just pass the sign bit and it sounds great. (Pulse Width Modulation). There's a program on compuserve that basically digitizes via a comparator. The record program then samples one bit (comparator output) via interrupts and stores the resulting bits on disk. The playback outputs to the speaker. The quality is very acceptable. This program was also posted on the net, so check your ibm.pc area. I tried the circuit at 8 kHz and it was just a little less than telephone quality.
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!attctc!sampson From: sampson@attctc.Dallas.TX.US (Steve Sampson) Newsgroups: sci.electronics Subject: Re: RS-232 for voice Message-ID: <8840@attctc.Dallas.TX.US> Date: 1 Aug 89 05:02:13 GMT References: <9185@kean.mun.ca> <3999@cps3xx.UUCP> Organization: The Unix(R) Connection, Dallas, Texas Lines: 8