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From: oster@well.sf.ca.us (David Phillip Oster)
Newsgroups: comp.sys.mac
Subject: Re: Audio Phone Dialer Software
Message-ID: <18540@well.sf.ca.us>
Date: 16 Jun 90 01:27:49 GMT
References: <3397@ssc-vax.UUCP>
Reply-To: oster@well.sf.ca.us (David Phillip Oster)
Organization: Whole Earth 'Lectronic Link, Sausalito, CA
Lines: 55

In article <3397@ssc-vax.UUCP> housen@ssc-vax.UUCP (Kevin Housen) writes:
>he needs some software (preferably a DA) to generate
>appropriate dial tones.  This would be pretty easy to
>write, but I wanted to check first to see if there are
>any PD/shareware DAs that will do the trick.

Both hypercard and Address Book Plus (a commercial product from Power Up
Corporation, that I wrote) dial the phone by generating audio tones.
AB+ uses a d.a., but it is commerical software, not shareware or public domain.

You can just hold the reciever up to the Mac on later Macs, but my testing
shows that not all raw MacPluss have enough volume to generate all the tones
reliably enough for the phone system. Experiment.

To dial the phone, you need two simultaneous tones. Hypercard and I use
the Sound Driver's 4 voice synthesizer to produce two pairs of tones by
doubling up the voices. Apple Developer Tech Support has been saying for
some time that they want people to stop using Sound Driver and do everything
with Sound Manager. Unfortunately, at least as of System 6.0.4, 4 voice sound
was not supported by Sound manager on Macpluss.
Here are the numbers from my dialer:

typedef struct Freq2 {
	Fixed a, b;
}Freq2;

/* These are the frequencies for the touch tone phone pad.
	Source: The TV Typewriter Cookbook, Don Lancaster, p.178
	Units for the table in comments is Hertz.
	The actual table was generated by applying the formula:
	hz = 1000000 / ( 44.93 * 256  / rate )
	to the table to get a new table I can use at interrupt time.
	This table uses the same values hypercard does.
 */
static Freq2 freqs[] = {
	{ 0x000F5DDE, 0x000AD2C9},	/* { 1336, 941},	/* 0 */
	{ 0x000DE7EA, 0x00080453},	/* { 1209, 697},	/* 1 */
	{ 0x000F5DDE, 0x00080453},	/* { 1336, 697},	/* 2 */
	{ 0x0010FD06, 0x00080453},	/* { 1477, 697},	/* 3 */
	{ 0x000DE7EA, 0x0008DB46},	/* { 1209, 770},	/* 4 */
	{ 0x000F5DDE, 0x0008DB46},	/* { 1336, 770},	/* 5 */
	{ 0x0010FD06, 0x0008DB46},	/* { 1477, 770},	/* 6 */
	{ 0x000DE7EA, 0x0009CCB9},	/* { 1209, 852},	/* 7 */
	{ 0x000F5DDE, 0x0009CCB9},	/* { 1336, 852},	/* 8 */
	{ 0x0010FD06, 0x0009CCB9},	/* { 1477, 852},	/* 9 */
	{ 0x0012C9B2, 0x00080453},	/* { 1633, 697},	/* A */
	{ 0x0010FD06, 0x0008DB46},	/* { 1477, 770},	/* B */
	{ 0x0010FD06, 0x0009CCB9},	/* { 1477, 852},	/* C */
	{ 0x0010FD06, 0x000AD2C9},	/* { 1477, 941},	/* D */
	{ 0x000DE7EA, 0x000AD2C9},	/* { 1209, 941},	/* * */
	{ 0x0010FD06, 0x000AD2C9}	/* { 1477, 941},	/* # */
};
-- 
-- David Phillip Oster - Note new address. Old one has gone Bye Bye.
-- oster@well.sf.ca.us = {backbone}!well!oster