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UPD7759GC-3BH Datasheet

  • UPD7759GC-3BH

  • ADPCM SPEECH SYNTHESIZER LSIs

  • 18頁

  • NEC   NEC

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DATA SHEET
MOS INTEGRATED CIRCUIT
碌
PD7759
ADPCM SPEECH SYNTHESIZER LSIs
The
碌
PD7759 is an external ROM type speech synthesis LSI employing the waveform coding
method. In addition to the ROM capability of up to 1 Mbit, the
碌
PD7759 realizes the synthesis of
speech sounds of any length by using the ADPCM data transferred from an external ROM.
As the synthesizing method, it adopts the ADPCM method and the PCM + waveform element method.
The ADPCM method is suitable for synthesizing clear and natural speech sounds, and the PCM + waveform
element method is for the synthesis of sound effects and melodies. And by using them together, the
碌
PD7759 realizes the long-time synthesis of high-quality sounds.
Because of the short turn-around time of speech analysis, the
碌
PD7759 can perform the quick system
development using a PROM, or the evaluation of an on-chip ROM type of the
碌
PD7755 family.
FEATURES
5
q
Synthesizing method
q
Sampling frequency
q
Bit rate (speech)
q
Number of Messages
5
q
External speech data ROM
Parameters
Speech data ROM
(External)
Products
Speech (ADPCM)
50 sec. (TYP.)
Synthesizing time
Note1
: ADPCM, PCM + waveform element methods used together
: 5, 6 or 8 kHz
: 20 to 32 K bps
: 256 (MAX.)
Melodies & sound effects
Note2
(PCM + waveform element)
340 sec. (TYP.)
碌
PD7759
1 Mbits
Note 1.
The synthesizing time for the speech is the value for a 6 kHz sampling.
2.
The synthesizing time for the melodies & sound effects is variable according to their tone.
q
Speech output
q
Host CPU interface
q
Standby mode
q
Supply voltage
q
CMOS technology
: Current sink type analog output, 9-bit D/A converter
: Compatible with a 4/8-bit CPU
: Pop-noise preventive circuit incorporated
: 2.7 to 5.5 V
ORDERING INFORMATION
Part Number
Package
40-pin plastic DIP (600 mil)
52-pin plastic QFP (s 14 mm)
s
Quality grade
Standard
Standard
碌
PD7759C
碌
PD7759GC-3BH
Please refer to "Quality grade on NEC Semiconductor Devices" (Document number IEI-1209) published by
NEC Corporation to know the specification of quality grade on the devices and its recommended applications.
The information in this document is subject to change without notice.
Document No. IC-2323A
(O.D.No.
IC-6960D)
Date Published January 1993
Printed in Japan
The mark
5
shows revised points.
漏
1988, 1993

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