I thought the OG Mac was only 1 channel at 11.25khz quality. Just wondering how the DTMF tones worked out the speaker, if they had Save the tones as samples or it was calculated on the fly?
I remember the Amiga 4 channels, 11.25khz, 8 bit sample rate, 2 for each side or you could use more of the CPU to calculate more than one sample per channel.
I remember there were some blue box software on the Amiga because of the whole wArEz scene happening at the end of the 80s-mid 90s when the price of phone calls over copper was expensive and now you can use VOIP which has destroyed lots of industries but has also been good for developing nations for people trying to call back home.
Quote from: pTeK on June 02, 2024, 05:05:19 PMI thought the OG Mac was only 1 channel at 11.25khz quality. Just wondering how the DTMF tones worked out the speaker, if they had Save the tones as samples or it was calculated on the fly?
You could easily do either. Generating a DTMF tone is not difficult: for each sample you just calculate two sine values and add them together --- and there are lots of tricks for speeding that up if you have the need.
Multi-channel hardware is not required if you can generate the tone fast enough. If you had the hardware, you could of course achieve the same effect by having one channel play one sine wave at one frequency while the second channel plays a different frequency. But with a bit of coding effort I don't think that generating a DTMF tone would have taxed the 68000 all that much.