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Address Bus
REVERB EFFECT CIRCUIT
Mix er
, Delayed
y' sound
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V \-n-31'25
kHz
Sample
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Mute Circuit
Sarnple/Hold Circuit
VCF output sound signal is digitized in built-in ADC in the DSP with sampling lrequency of 31 .25 KHz.
The digital sound data lrom built-in ADC is temporary stored in the RAM.
The stored data"in RAM is read by DSP (Digital Signal Processo0 and re-formed in a waveform in DAC2.
At this lime, DSR changes the reiding sieed by viring address signals' frequency in order to delay the
sound signal.
Since DAC2 output is'stepped waveform containing glitch noise, Sample/Hold Circuit removes the glitch
and Filter smoothes the stepped waveform.
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When the horn is not blown, CPU turns the FET off by signal PC4 to cut the sound off.
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Reverb effect is given by adding VCF output and delayed sound.
PC4 trom CPU
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