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MSM6722 Datasheet, PDF (1/21 Pages) OKI electronic componets – Pitch Control IC for The Speech Signal
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MSM6722
Pitch Control IC for The Speech Signal
FEDL6722-05
FEDLM67S2M2-607522
Issue Date: Feb. 27, 2002
GENERAL DESCRIPTION
The MSM6722 converts in real-time the pitch of the speech signal in a range of one octave upward
or downward.
Two pitch control methods can be selected. One is to change the pitch in 17 steps by two switch
inputs, and the other is to select one of 16 steps by four binary input lines.
Since a microphone preamplifier and a low-pass filter are built in, the pitch conversion set can
easily be configured by connecting a microphone, amplifier, and speaker in the peripheral
circuit. The MSM6722 is functionally compared to the MSM6322, as described below.
1. Method of reseting the speech pitch step (UP/DW mode)
MSM6322 ·············· PRST pin only
MSM6722 .............. Two methods are available. One is to reset by the PRST pin only, and
the other is to reset using the UPC and DWC pins coneurrently.
2. Change in pitch
MSM6322 ·············· Speech pitch is changeable in 17 steps.
Pitch step 16
DW
Pitch step 8
UP
Pitch step 0
MSM6722 ·············· The pitch step does not change if a signal is input to the UPC (DWC) pin
when the pitch step is 16 or 0.
Pitch step 16
Pitch step 8
UP, DW
Pitch step 0
3. Additional THR/CHA pin
This pin outputs a voice signal without passing the pitch conversion circuit including
ADC•DAC.
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