Nate, DSP is ICs and software. Of course anyone spending the high money to replace an 8880 is somewhat in the dark for most applications.
DSP is much more suitable and cost effective in more difficult things than DTMF decoding and encoding. 73, ron, n9ee/r >From: Nate Duehr <[EMAIL PROTECTED]> >Date: 2008/03/26 Wed PM 03:18:00 CDT >To: [email protected] >Subject: Re: [Repeater-Builder] DTMF Decoder > >Ron Wright wrote: > >>Dedicated circuits and ICs do a much better job. > >Disagree, but it's only semantics. > >We've got some DSP code here at work that'll kick an MT8800's ass any >day of the week, upside-down, and sideways. And it'll do it on 336 >phone lines AT THE SAME TIME. > >Last I checked, it will decode down to at least -31 dBmV and twist and >skew numbers are better than the 8800. Standard voice falsing tests >also perform better. > >And we didn't even write it, it's off-the-shelf DSP code from a vendor. > But it wasn't cheap. > >So, we're not going to find that code or hardware in any ham projects, >ever... > >(Actually I guess you could... they're relatively old AT&T DSP's, >available on the open market, and the company that made the code is also >out there... somewhere...) > >Maybe your idea is better phrased as something like this: > >"For low-budget jobs, dedicated circuits designed in the 1980's still do >a better job than hobbyist level software DSP in PC's." > >:-) > >Nate WY0X > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
