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use pwm to make speech synthesize

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well

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I have some question about my pwm speech synthesize module.
I write a pwm module use verilog to make speech synthesize,
I test this module on FPGA, I can hear the voice that i want to play.
but there is some high frequence noice in the speech.
can anybody give me some suggestion?
I think there is some problem with my low filter, but I do not know how to change it.
 

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