Re: Older Hardware Still Works

Subject	Re: Older Hardware Still Works
Newsgroups	comp.os.linux.misc
References	(11 earlier) <107hopd$3pna1$15@dont-email.me> <GqycnRdrn408ygD1nZ2dnZfqn_idnZ2d@giganews.com> <mg55hiFbvqnU2@mid.individual.net> <107kipo$d4vh$28@dont-email.me> <mg6r6kFkdaqU5@mid.individual.net>
From	c186282 <c186282@nnada.net>
Date	2025-08-15 01:37 -0400
Message-ID	<ntmcnc1LSPoSWgP1nZ2dnZfqn_GdnZ2d@giganews.com> (permalink)

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On 8/14/25 3:19 PM, rbowman wrote:
> On Thu, 14 Aug 2025 12:54:32 +0100, The Natural Philosopher wrote:
> 
>> I'm messing with a pi PICO at the moment for PWM, and crude audio looks
>> entirely possible - especially if you stored the waveforms in flash to
>> avoid having to calculate them in real time.
> 
> https://github.com/cleversonahum/dtmf-generator/blob/main/dtmf-
> generator.py
> 
> I didn't read it carefully but I think this would allow you to create
> a .wav for each digit.

   Probably.

   It might be better than real-time synthesis, esp
   on low-end units like Pico's, Ard's and PICs.

   What we seems to be lacking here is hard DATA ...
   just HOW sensitive are modern telcom systems to
   'perfect' DTMF tones ? Dunno if they still filter
   to detect each freq, or look for some kind of
   beat tone. This has probably changed some since
   the 1970s.

   When I was a kiddie, a teacher took us to the
   nearby ATT/BELL telcom HQ. In the front office
   were human 'operators'. But the other 95% of
   the big brick building was dedicated to
   relay-based dialing/connecting units. Just
   FASCINATING ... tubes full of disks. As
   people dialed the disks would rotate and
   move up and down, physically connecting
   hard lines. Dunno HOW anyone figured out
   all those hardwire connections ....

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Older Hardware Still Works c186282 <c186282@nnada.net> - 2025-08-10 23:05 -0400
  Re: Older Hardware Still Works rbowman <bowman@montana.com> - 2025-08-11 04:15 +0000
    Re: Older Hardware Still Works c186282 <c186282@nnada.net> - 2025-08-11 00:42 -0400
      Re: Older Hardware Still Works rbowman <bowman@montana.com> - 2025-08-11 06:17 +0000
        Re: Older Hardware Still Works c186282 <c186282@nnada.net> - 2025-08-11 03:11 -0400
          Re: Older Hardware Still Works Marc Haber <mh+usenetspam1118@zugschl.us> - 2025-08-11 11:21 +0200
            Re: Older Hardware Still Works The Natural Philosopher <tnp@invalid.invalid> - 2025-08-11 11:59 +0100
              Re: Older Hardware Still Works Marc Haber <mh+usenetspam1118@zugschl.us> - 2025-08-11 17:16 +0200
            Re: Older Hardware Still Works c186282 <c186282@nnada.net> - 2025-08-11 13:12 -0400
              Re: Older Hardware Still Works Marc Haber <mh+usenetspam1118@zugschl.us> - 2025-08-11 22:22 +0200
                Re: Older Hardware Still Works c186282 <c186282@nnada.net> - 2025-08-11 20:34 -0400
                Re: Older Hardware Still Works Marc Haber <mh+usenetspam1118@zugschl.us> - 2025-08-12 06:36 +0200
                Re: Older Hardware Still Works c186282 <c186282@nnada.net> - 2025-08-12 01:25 -0400
                Re: Older Hardware Still Works Richard Kettlewell <invalid@invalid.invalid> - 2025-08-12 08:31 +0100
            Re: Older Hardware Still Works rbowman <bowman@montana.com> - 2025-08-11 19:35 +0000
              Re: Older Hardware Still Works Marc Haber <mh+usenetspam1118@zugschl.us> - 2025-08-11 22:23 +0200
          Re: Older Hardware Still Works rbowman <bowman@montana.com> - 2025-08-11 19:30 +0000
            Re: Older Hardware Still Works Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-08-11 22:20 +0000
              Re: Older Hardware Still Works rbowman <bowman@montana.com> - 2025-08-12 02:00 +0000
                Re: Older Hardware Still Works c186282 <c186282@nnada.net> - 2025-08-11 23:25 -0400
                Re: Older Hardware Still Works "Carlos E. R." <robin_listas@es.invalid> - 2025-08-12 10:18 +0200
                Re: Older Hardware Still Works not@telling.you.invalid (Computer Nerd Kev) - 2025-08-13 09:32 +1000
                Re: Older Hardware Still Works Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-08-13 03:55 +0000
                Re: Older Hardware Still Works c186282 <c186282@nnada.net> - 2025-08-13 01:39 -0400
                Re: Older Hardware Still Works John-Paul Stewart <jpstewart@personalprojects.net> - 2025-08-12 09:25 -0400
                Re: Older Hardware Still Works c186282 <c186282@nnada.net> - 2025-08-13 01:37 -0400
                Re: Older Hardware Still Works The Natural Philosopher <tnp@invalid.invalid> - 2025-08-13 11:18 +0100
                Re: Older Hardware Still Works c186282 <c186282@nnada.net> - 2025-08-13 23:27 -0400
                Re: Older Hardware Still Works rbowman <bowman@montana.com> - 2025-08-14 04:04 +0000
                Re: Older Hardware Still Works c186282 <c186282@nnada.net> - 2025-08-14 02:06 -0400
                Re: Older Hardware Still Works "Carlos E. R." <robin_listas@es.invalid> - 2025-08-14 10:59 +0200
                Re: Older Hardware Still Works The Natural Philosopher <tnp@invalid.invalid> - 2025-08-14 12:56 +0100
                Re: Older Hardware Still Works rbowman <bowman@montana.com> - 2025-08-14 19:12 +0000
                Re: Older Hardware Still Works c186282 <c186282@nnada.net> - 2025-08-15 01:25 -0400
                Re: Older Hardware Still Works The Natural Philosopher <tnp@invalid.invalid> - 2025-08-15 14:49 +0100
                Re: Older Hardware Still Works The Natural Philosopher <tnp@invalid.invalid> - 2025-08-15 14:47 +0100
                Re: Older Hardware Still Works The Natural Philosopher <tnp@invalid.invalid> - 2025-08-14 12:54 +0100
                Re: Older Hardware Still Works rbowman <bowman@montana.com> - 2025-08-14 19:19 +0000
                Re: Older Hardware Still Works c186282 <c186282@nnada.net> - 2025-08-15 01:37 -0400
                Re: Older Hardware Still Works rbowman <bowman@montana.com> - 2025-08-15 07:22 +0000
                Re: Older Hardware Still Works c186282 <c186282@nnada.net> - 2025-08-15 03:46 -0400
                Re: Older Hardware Still Works Andy Burns <usenet@andyburns.uk> - 2025-08-15 08:50 +0100
                Re: Older Hardware Still Works Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-15 08:43 +0000
                Re: Older Hardware Still Works The Natural Philosopher <tnp@invalid.invalid> - 2025-08-15 14:57 +0100
                Re: Older Hardware Still Works Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2025-08-15 13:07 -0700
                Re: Older Hardware Still Works rbowman <bowman@montana.com> - 2025-08-16 08:02 +0000
                Re: Older Hardware Still Works The Natural Philosopher <tnp@invalid.invalid> - 2025-08-15 14:48 +0100
                Re: Older Hardware Still Works rbowman <bowman@montana.com> - 2025-08-13 19:42 +0000
                Re: Older Hardware Still Works The Natural Philosopher <tnp@invalid.invalid> - 2025-08-14 12:37 +0100
                Re: Older Hardware Still Works Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-08-12 18:47 +0000
                Re: Older Hardware Still Works Andy Burns <usenet@andyburns.uk> - 2025-08-13 08:05 +0100
                Re: Older Hardware Still Works c186282 <c186282@nnada.net> - 2025-08-13 22:22 -0400
                Re: Older Hardware Still Works rbowman <bowman@montana.com> - 2025-08-14 04:14 +0000
                Re: Older Hardware Still Works c186282 <c186282@nnada.net> - 2025-08-14 02:41 -0400
                Re: Older Hardware Still Works rbowman <bowman@montana.com> - 2025-08-14 18:57 +0000
                Re: Older Hardware Still Works c186282 <c186282@nnada.net> - 2025-08-15 00:35 -0400
                Re: Older Hardware Still Works The Natural Philosopher <tnp@invalid.invalid> - 2025-08-14 12:45 +0100
                Re: Older Hardware Still Works Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-08-12 18:47 +0000
                Re: Older Hardware Still Works Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-08-13 03:58 +0000
      Re: Older Hardware Still Works John Ames <commodorejohn@gmail.com> - 2025-08-11 09:20 -0700
  Re: Older Hardware Still Works "Carlos E.R." <robin_listas@es.invalid> - 2025-08-11 11:47 +0200
    Re: Older Hardware Still Works The Natural Philosopher <tnp@invalid.invalid> - 2025-08-11 12:00 +0100
      Re: Older Hardware Still Works Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-17 01:10 +0000

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