Because FREQOUT is using PWM with the ability to output two tones at the same time, so filtering is required to produce a, relatively clean, sinewave-looking tone.
even at 64mhz, FREQUOUT provides very low volume, distorted audio, while SOUND, even on 4Mhz 628A chip, produces loud and clear sound.
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Published on - 31st May 2010 17:24
Number of Views: 16146
Since this question has come up again, I thought I'd throw this module out to the masses. It is something I worked on a while back, with DT's help. Amid life's other priorities, it got put on the shelf to collect dust.
The basic idea is that by adding the module as an INCLUDE and inserting a couple of commands inside your code, you can have the PIC send timing data to your PC via the hardware serial port. It's made for 18F PICs (although some 16Fs may work too). You also need a timer that is not being used for anything else.
1) Instructions are included, as well as a small example.
2) It worked well for me, and as I recall, DT in testing.
3) Use it however you want.
4) I won't be able to offer much support, but figure there are enough knowledgeable folks around here that can help those who need it.
Re: Why SOUND statement produces loud and clear sound, but FREQOUT - does not?
Because FREQOUT is using PWM with the ability to output two tones at the same time, so filtering is required to produce a, relatively clean, sinewave-looking tone.
Ioannis Yesterday, 18:06On the otjher hand, SOUND...