> On Jul 11, 2023, at 3:06 PM, Marc Howard via cctalk
> wrote:
>
> Try 1970.
> https://www.vintagecomputermusic.com/notran_system.php
>
> I worked in the same (computer graphics) lab with Hal. He wrote the
> seminal book on microprocessor generated music and later worked at Kurzweil.
That
I.com is also worth
> a look
>
> Martin
>
> PS Most contemporary audio work uses SigmaDelta converters, see e.g.
> Analog Devices AN-283 and MT-022
>
> -Original Message-
> From: Douglas Taylor via cctalk [mailto:cctalk@classiccmp.org]
> Sent: 11 July 2023 17
uses SigmaDelta converters, see e.g. Analog
Devices AN-283 and MT-022
-Original Message-
From: Douglas Taylor via cctalk [mailto:cctalk@classiccmp.org]
Sent: 11 July 2023 17:29
To: Mike Katz via cctalk
Cc: Douglas Taylor
Subject: [cctalk] Re: Talking PDP11
The DACs on the AAV11-C b
I wouldn't want to violate my NDA!
On July 11, 2023 12:42:57 p.m. EDT, Douglas Taylor via cctalk
wrote:
>Funny you mention that, I've got a Data Translation DT2766 and it is identical
>to the AAV11-C. I mean identical! In the day DT must have sold them based on
>2 selling points: (1)
Funny you mention that, I've got a Data Translation DT2766 and it is
identical to the AAV11-C. I mean identical! In the day DT must have
sold them based on 2 selling points: (1) Cheaper than DEC and (2) Exact
drop in replacement for the DEC AAV11-C.
Doug
On 7/11/2023 12:33 PM, Nigel
You might try looking for Data Translation products. I know some of the later
ad and da modules were made by them for DEC
On July 11, 2023 12:28:43 p.m. EDT, Douglas Taylor via cctalk
wrote:
>The DACs on the AAV11-C board are not marked in any revealing way. I think
>they are Burr Brown
> On Jul 11, 2023, at 11:20 AM, Will Cooke via cctalk
> wrote:
>
>
>
>> On 07/11/2023 9:59 AM CDT Paul Koning via cctalk
>> wrote:
>
>
>> But, judging by Wikipedia, the earlier Synclavier models were not digital
>> sampled waveform synthesizers but rather FM synthesizers. So I still
The DACs on the AAV11-C board are not marked in any revealing way. I
think they are Burr Brown DAC80, 24 pin, but I'm not sure. I wasn't
sure if they were working and was looking for a replacement.
Looking at the spec sheets DAC's seem to come in Voltage or Current
versions. Life got more
I originally used R-2R DACs but I was lucky enough to be able to buy a
couple of DAC08 chips at Radio Shack and built a circuit using 74LS244
latching buffers so that I could drive both channels of a single 8-bit
parallel port and 2 extra control lines (Select and Strobe).
On 7/11/2023 6:43
> On 07/11/2023 9:59 AM CDT Paul Koning via cctalk
> wrote:
> But, judging by Wikipedia, the earlier Synclavier models were not digital
> sampled waveform synthesizers but rather FM synthesizers. So I still wonder
> if anyone did it earlier than Sherwin.
>
> paul
Possibly the Computer
> On Jul 11, 2023, at 11:11 AM, Bill Degnan via cctalk
> wrote:
>
> Coincidentally I am doing research into this topic and here is a great
> article that you all would find on topic to this discussion
>
>
Coincidentally I am doing research into this topic and here is a great
article that you all would find on topic to this discussion
https://www.vintagecomputer.net/CISC367/creative%20computing%20mar-apr%201977%20UDel-Sound-Synthisizer.pdf
I have one of the U of Delaware Plato Synths btw...working
> On Jul 11, 2023, at 10:51 AM, William Donzelli via cctalk
> wrote:
>
> The Synclavier I was commercially available in 1977, based off the
> Dartmouth Digital Synthesizer of earlier times. The core was a New
> England Digital minicomputer architecture (they did sell just the
> minicomputer
The Synclavier I was commercially available in 1977, based off the
Dartmouth Digital Synthesizer of earlier times. The core was a New
England Digital minicomputer architecture (they did sell just the
minicomputer to the military, as a side).
The truth is that there were quite a few digital synths
And by 1979 there was the fairlight...
https://en.wikipedia.org/wiki/Fairlight_CMI
73 Eugene W2HX
Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos
>Speaking of old computerized music playing technology, there are two from the
>PLATO system at the University of Illinois
> On Jul 11, 2023, at 7:43 AM, ste...@malikoff.com steven--- via cctalk
> wrote:
>
>> On 07/10/2023 11:31 PM AEST Mike Katz via cctalk
>> wrote:
>> Way back in the 80's I was able to do stereo 4 part harmony on a 2 MHZ
>> 6809 using two 8-bit D/A converters.
>
> Much the same here. I
> On 07/10/2023 11:31 PM AEST Mike Katz via cctalk
> wrote:
> Way back in the 80's I was able to do stereo 4 part harmony on a 2 MHZ
> 6809 using two 8-bit D/A converters.
Much the same here. I recounted this on VCFed a few months ago about building a
simple 2-chip 8-bit ladder DAC with
On 7/10/23 11:19, Douglas Taylor via cctalk wrote:
I'm looking to see if it possible to do something
similar. Just blasting raw 12bit samples from memory out
the D/A board.
A fine point would be to use the KWV11-C realtime clock
board for the sample rate control. No interrupts, just
> On Jul 10, 2023, at 12:19 PM, Douglas Taylor via cctalk
> wrote:
>
> I'm looking to see if it possible to do something similar. Just blasting raw
> 12bit samples from memory out the D/A board.
> A fine point would be to use the KWV11-C realtime clock board for the sample
> rate control.
I'm looking to see if it possible to do something similar. Just
blasting raw 12bit samples from memory out the D/A board.
A fine point would be to use the KWV11-C realtime clock board for the
sample rate control. No interrupts, just polling.
Harder is taking an existing MPG or WAV audio clip
On my Apple ] [ with 48k memory I used to be able to sample audio from the
cassette port and store about 30 seconds of audio that was fairly decent
quality upon playback. With a 1MB RAM board installed I was able to sample
the entire ~5 minutes of Led Zeppelin's Over The Hills And Far Away from
> On Jul 9, 2023, at 9:19 PM, Douglas Taylor via cctalk
> wrote:
>
> Wow! Actual engineers responding...
>
> It looks like I could only do the most rudimentary audio.
>
> 1. Sample Rate: You got maybe 20K samples to store in lower memory. At 7KHz
> sample rate that would allow 3 seconds
siccmp.org]
Sent: 10 July 2023 02:20
To: Martin Bishop via cctalk
Cc: Douglas Taylor
Subject: [cctalk] Re: Talking PDP11
Wow! Actual engineers responding...
It looks like I could only do the most rudimentary audio.
1. Sample Rate: You got maybe 20K samples to store in lower memory. At 7KHz
sa
to speech
of 1980's (i.e. contemporary period) standard.
Have fun
Martin
-Original Message-
From: Douglas Taylor via cctalk [mailto:cctalk@classiccmp.org]
Sent: 10 July 2023 02:20
To: Martin Bishop via cctalk
Cc: Douglas Taylor
Subject: [cctalk] Re: Talking PDP11
Wow! Actual
Wow! Actual engineers responding...
It looks like I could only do the most rudimentary audio.
1. Sample Rate: You got maybe 20K samples to store in lower memory. At
7KHz sample rate that would allow 3 seconds of audio. Voice only.
2. Samples: They must be 12 bits. Converting a modern audio
You just did use it to play "audio" :<)
The 6 us settling time corresponds to a sampling rate of ~167 kHz, not that you
will ever get there or would wish to.
The theoretical (real) sampling rate required for a given bandwith is Fs = 2
Bw. That requires brick wall filters and it is a lot of
On 7/9/23 13:46, Douglas Taylor via cctalk wrote:
I have a PDP-11/53 and have just started playing with an
AAV11-C D/A board. It is a 4 channel D/A convertor with
12 bit resolution.
Can it be used to play an audio bit stream?
Here is simple code used to see if the thing was actually
> On 07/09/2023 1:46 PM CDT Douglas Taylor via cctalk
> wrote:
>
>
> I was surprised to see that it took ~34 ms to run through all the
> numbers from 0-, that is about 34 Hz. The manual says the 'settling
> time' is 6 microseconds. Is this fast enough for audio?
>
> How would you
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