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Part: MSM6722
Category:
Communication
-> Telephony
-> Speech
Description: Pitch Control ic For The Speech Signal
Company: Oki Semiconductor
Datasheet: Download MSM6722 datasheet File size : 439 kB
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Datasheet text preview:
E2D0046-39-21
¡ Semiconductor MSM6722
¡ Semiconductor Pitch Control IC for The Speech Signal
This version: Feb.M6722 MS 1999 Previous version: May. 1997
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. Speech pitch step reset (UP/DW mode) MSM6322 ·············· PRST pin only MSM6722 ·············· PRST pin and UP·C (DW·C) pin available. 2. Change in pitch MSM6322 ·············· Speech pitch is changeable in 17 steps.
Pitch step 16
DW
Pitch step 8 Pitch step 0
UP
MSM6722 ·············· The pitch step does not change if a signal is input to the UP·C (DW·C) pin when the pitch step is 16 or 0.
Pitch step 16
Pitch step 8 Pitch step 0
UP, DW
3. Additional THR/CHA pin This pin outputs a voice signal without passing the pitch conversion circuit including ADC·DAC.
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¡ Semiconductor
MSM6722
FEATURES
· Built-in microphone preamplifier · Built-in low-pass filters · Built-in 8-bit AD converter · Built-in 9-bit DA converter · Speech pitch alterable in 17 steps (including the no pitch change step) · Master clock frequency at 4 MHz · 5 V single power supply · Package : 24-pin plastic SOP (SOP24-P-430-1.27-K) (Product name : MSM6722GS-K) Chip
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¡ Semiconductor
MSM6722
BLOCK DIAGRAM
DVDD MIN SG MOUT LIN SG LOUT FOUT ADIN VOICE CHANGER CIRCUIT + + LPF ADC 8 + AVDD DGND AGND TEST
AOUT DAO PD (P3) UPC (P2) DWC (P1) PRST (P0) MS THR/CHG RESET XT XT
LPF
DAC
9
TIMING & CONTROL
OSC
PIN CONFIGURATION (TOP VIEW)
PD (P3) 1 UPC (P2) 2 DWC (P1) 3 PRST (P0) 4 MS 5 THR/CHG 6 TEST 7 DAO 8 AOUT 9 ADIN 10 FOUT 11 AVDD 12
,
24 23 22 21 20 19 18 17 16 15 14 13
SG CIRCUIT
SGC
SG
DVDD XT XT RESET DGND SG AGND SGC MIN MOUT LIN LOUT
24-Pin Plastic SOP
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Others parts begin by ms
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