Decaying sounds synthesis with PWM

[HankMcSpank]

Hello everyone

I know such sound are basically tones with exponentially decaying envelope and wondering if their spectrums can be somewhat emulated with appropriate modulation of frequency and/or duty cycle of a PWM output (say the PIC PWM module) without using an external Programmable Gain Amplifier for the envelope.

Constructing bell-esque sounds using synths normally involves several sine waves and complicated algorithms (eg think Yamaha DX7) ...I'd hazard a guess & say that reading/playing a sample would be the best way to achieve what you want (ie no recourse to external envelope shaping hw)

[Jerson]

I guess you can do this. I can hazard a way to do it. Use the Timer/CCP module to generate the frequency/ies you need. Another output is used as envelope control which snubs the output. So, you have frequency and amplitude modulation in effect. Never tried it, so, don't hold me to this. Just an idea that can work

[ScaleRobotics]

Some different ways to do sound here: http://www.picbasic.co.uk/forum/showthread.php?t=8113