Chapter 1 Outline; Features - NEC mPD7755 User Manual

CHAPTER 1 OUTLINE
The
~PD7755
/7756 is a speech synthesis LSI that employs
the waveform coding method. By combining the ADPCM coding
method and phoneme method, natural synthesized speech has
been realized. Also, the wide range of the operating volta-
ges, compact package, standby function, etc., make these
LSIs ideal for various application systems such as battery-
driven systems.
1.1 Features
Synthesizing method
Sampling frequency
:Combined ADPCM and phoneme methods
:4,
5, 6 or 8kHz
Bit rate (speech) :8 to 32kbps
Built-in speech data ROM :96K bits
(~PD7755
256K bits (~PD7756
Synthesizing time :12 sec. max. (~PD7755
Built-in D/ A converter
32 sec. max. (~PD7756
:9-bit resolution
current output
Built-in standby function:Popc o rn noise suppressor
Supply voltage
Process
package
incorporated
:2.7 to 5.5V
:CMOS
:18-pin plastic DIP
1-1