From analogue-request@magnus.acs.ohio-state.edu Fri May 7 12:19:24 1993 Received: by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA29146; Fri, 7 May 93 12:16:40 -0400 Errors-To: analogue-request@magnus.acs.ohio-state.edu Sender: analogue-request@magnus.acs.ohio-state.edu Received: from acid-rain.lucid.com by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA29141; Fri, 7 May 93 12:16:37 -0400 Received: by acid-rain.lucid.com (4.1/SMI-4.1) id AA04949; Fri, 7 May 93 09:16:33 PDT Date: Fri, 7 May 93 09:16:33 PDT From: till@lucid.com (Don Tillman) Message-Id: <9305071616.AA04949@acid-rain.lucid.com> To: analogue@magnus.acs.ohio-state.edu In-Reply-To: 's message of Thu, 6 May 93 06:43:51 -0400 <9305061043.AA21087@quark.magnus.acs.ohio-state.edu> Subject: Pitch To Voltage converter Reply-To: till@lucid.com Status: OR [Rick, ignore the previous message I sent, I goofed up the To: line and sent it to you only.] Date: Thu, 6 May 93 06:43:51 -0400 From: Date: Thu, 06 May 93 12:42:08 N I'd be grateful if anyone could direct me to the schematic of a pitch-to-voltage converter. Or even a general idea of how they work. Well, you haven't told us anything specific about how you want to use the PtV converter so you'll get some answers that won't be applicable. What do you want to use it for? What's the frequency range you want to cover? What's the input signal look like? How fast does the conversion have to work? How accurate does the conversion need to be? Do you want a linear or a log output? From: Peter Cassidy Date: Thu, 6 May 93 15:07:11 BST OK. Here's one, straight from the R.S catalog: I don't know anything about this one (it's not in my Radio Shack catalog) so I can't comment. Date: Thu, 06 May 93 10:34:08 -0400 From: Yoshiaki_Ohshima@SPEECH1.CS.CMU.EDU i think f-to-v converter ic's are commercially available. but i'm not certain if they are to your need. so i speak of things in general. the principle is, if i recall correctly, trigger a one shot pulse (like 555) by the edges of the frequency counter output (like the one you use in the octaver or the divider circuit) and integrate it. the read out from the integrator capacitor tracks the number of pulses with a certain time constant to your spec. True enough, but these devices won't be too useful for electronic music work (I'm guessing that's the context of Rick's request). For instance, if there's any grunge or noise in the input signal, then the output voltage will be way off. There are far better methods like using a phase locked loop or digitally counting the time between pulses. for some instruments such as guitars, building a reliable frequency counter is not easy. Absolutely! For guitars the signal waveform is very ragged and constantly changing (string harmonics are almost never integral multiples of the fundamental and the harmonic conent changes drastically depending on how you play and what note you're playing), the waveform level is all over the place, and guitarists generally do not play very cleanly. Also there's a need for the conversion to take place in a cycle or two. Certainly difficult. -- Don From analogue-request@magnus.acs.ohio-state.edu Thu May 6 12:22:58 1993 Received: by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA01999; Thu, 6 May 93 11:20:29 -0400 Errors-To: analogue-request@magnus.acs.ohio-state.edu Sender: analogue-request@magnus.acs.ohio-state.edu Received: from att-out.att.com by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA01994; Thu, 6 May 93 11:20:26 -0400 From: wbf@aluxpo.att.com Received: from alux1.cnet.att.com by aluxpo (4.1/DCS-aluxpo-040293) id AA12267; Thu, 6 May 93 11:15:43 EDT Received: by alux1.cnet.att.com (4.1/DCS-aluxpo_client-022293) id AA07077; Thu, 6 May 93 11:15:43 EDT Date: Thu, 6 May 93 11:15:43 EDT Original-From: aluxpo!wbf (William Fox) Message-Id: <9305061515.AA07077@alux1.cnet.att.com> To: analogue@magnus.acs.ohio-state.edu Subject: Re: FTV Status: OR Subject: Re: FTV converter I'm not familiar with the device that Peter suggested. In the past, I noticed that many F-to-V chips required a pulse input. This may be derived by low pass filtering your source (you can play with that) and then use a comparator to do zero crossing detection. Apply this pulse to the F-to-V chip. I make no claims as to usefulness. Bill Fox From analogue-request@magnus.acs.ohio-state.edu Thu May 6 11:23:23 1993 Received: by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA01999; Thu, 6 May 93 11:20:29 -0400 Errors-To: analogue-request@magnus.acs.ohio-state.edu Sender: analogue-request@magnus.acs.ohio-state.edu Received: from att-out.att.com by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA01994; Thu, 6 May 93 11:20:26 -0400 From: wbf@aluxpo.att.com Received: from alux1.cnet.att.com by aluxpo (4.1/DCS-aluxpo-040293) id AA12267; Thu, 6 May 93 11:15:43 EDT Received: by alux1.cnet.att.com (4.1/DCS-aluxpo_client-022293) id AA07077; Thu, 6 May 93 11:15:43 EDT Date: Thu, 6 May 93 11:15:43 EDT Original-From: aluxpo!wbf (William Fox) Message-Id: <9305061515.AA07077@alux1.cnet.att.com> To: analogue@magnus.acs.ohio-state.edu Subject: Re: FTV Status: OR Subject: Re: FTV converter I'm not familiar with the device that Peter suggested. In the past, I noticed that many F-to-V chips required a pulse input. This may be derived by low pass filtering your source (you can play with that) and then use a comparator to do zero crossing detection. Apply this pulse to the F-to-V chip. I make no claims as to usefulness. Bill Fox From analogue-request@magnus.acs.ohio-state.edu Thu May 6 07:00:07 1993 Received: by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA21357; Thu, 6 May 93 06:59:50 -0400 Errors-To: analogue-request@magnus.acs.ohio-state.edu Sender: analogue-request@magnus.acs.ohio-state.edu Received: from motgate.mot.com by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA21352; Thu, 6 May 93 06:59:48 -0400 Received: from pobox.mot.com ([129.188.137.100]) by motgate.mot.com with SMTP (5.65c/IDA-1.4.4/MOT-2.14 for ) id AA25559; Thu, 6 May 1993 05:59:46 -0500 Received: from comm.mot.com (il02dns1.comm.mot.com) by pobox.mot.com with SMTP (5.65c/IDA-1.4.4/MOT-2.14) id AA21560; Thu, 6 May 1993 05:59:45 -0500 Received: from dub-tse (dub-tse.comm.mot.com) by comm.mot.com (4.1/SMI-4.0) id AA22762; Thu, 6 May 93 06:01:35 CDT Message-Id: <9305061101.AA22762@comm.mot.com> Received: by dub-tse (16.6/16.2) id AA23065; Thu, 6 May 93 11:55:42 +0100 From: Peter Cassidy Subject: Re: pitch to voltage To: RICK@sara.nl Date: Thu, 6 May 93 11:55:41 BST Cc: ANALOGUE@magnus.acs.ohio-state.edu (Analogue Mail List) In-Reply-To: <9305061043.AA21087@quark.magnus.acs.ohio-state.edu>; from "RICK@sara.nl" at May 6, 93 6:43 am Mailer: Elm [revision: 66.25] Status: OR > From: Rick Jansen > > > I'd be grateful if anyone could direct me to the schematic of > a pitch-to-voltage converter. Or even a general idea of how they > work. > > Rick Jansen > -- > rick@sara.nl > This sounds like an interesting project. Have you looked at F-V convertor IC's (Freq to voltage convertors). They're commonly available. I'll have a look at specs, prices. There is a schematic available in the RS Data Library. I'll bring it in tomorrow from home !! -- Regards, Peter ------------------------------------------------------------------------------ | M O T O R O L A B . V . I R E L A N D | | ----------------------------------------- | | Peter Cassidy - T.S.E Dublin | Phone : 353-1-840-8866 Ext. 417 | | MACCVM : C10404 | X400 : peterc@comm.mot.com | ------------------------------------------------------------------------------ From analogue-request@magnus.acs.ohio-state.edu Thu May 6 06:44:11 1993 Received: by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA21092; Thu, 6 May 93 06:43:52 -0400 Errors-To: analogue-request@magnus.acs.ohio-state.edu Sender: analogue-request@magnus.acs.ohio-state.edu Received: from ohstvma.acs.ohio-state.edu by quark.magnus.acs.ohio-state.edu (5.65/3.910213) id AA21087; Thu, 6 May 93 06:43:51 -0400 Date: Thu, 6 May 93 06:43:51 -0400 From: Message-Id: <9305061043.AA21087@quark.magnus.acs.ohio-state.edu> Received: from OHSTVMA.ACS.OHIO-STATE.EDU by OHSTVMA.ACS.OHIO-STATE.EDU (IBM VM SMTP R1.2.1MX) with BSMTP id 6250; Thu, 06 May 93 06:44:02 EDT Received: from HASARA5.BITNET (NJE origin MAILGATE@HASARA5) by OHSTVMA.ACS.OHIO-STATE.EDU (LMail V1.1d/1.7f) with BSMTP id 6249; Thu, 6 May 1993 06:44:02 -0400 Received: from diamond.sara.nl by SARA.NL for analogue@magnus.acs.ohio-state.edu; 6 May 93 12:43 MET Received: by diamond.sara.nl (5.61-AIX-1.2/1.0), id AA108610, (for analogue@magnus.acs.ohio-state.edu, from sscprick@diamond.sara.nl Apparently-To: Status: OR ); Message-Id: <9305061142.AA108610@diamond.sara.nl> To: analogue@magnus.acs.ohio-state.edu Subject: PTV - Pitch To Voltage converter Date: Thu, 06 May 93 12:42:08 N From: Rick Jansen I'd be grateful if anyone could direct me to the schematic of a pitch-to-voltage converter. Or even a general idea of how they work. Rick Jansen -- rick@sara.nl She's a module and she's looking good