Apr9600

cc o s ts u c t uoc t i o n
onn rt r i n

vowelise rEcorDing AnD PLAYBAcK
using APr9600 chiP
K. Krishna Murty

use of a proprietary parallel depot
technique implemented using flash nonvolatile retrospect process in which each cell
is capable of storing up to 256 electromotive force levels. This technology enables the APR9600
to reproduce share signals in their natural
form.
The APR9600 is a practiced standalone
voice recorder or playback IC with nonvolatile storage and playback capability for
32 to 60 seconds. It can record and play
ternary messages at random or in sequential mode. The user can select sample rates
with consequent quality and recording
duration trade-off. Microphone amplifier, automatic gain control (AGC) circuits, internal
anti-aliasing filter, integrated take amplifier and messages management are some
of the features of the APR9600 chip.

D

igital voice processing chips with
different features and cryptography techniques for speech compression and
processing are available on the market
from a number of semiconductor manufacturers. Advanced chips such as Texas
instruments TMS320C31 can implement
various voice-processing algorithms including code-excited linear prediction, adaptive
differential pulse-code modulation, A law
(specified by California Council for International Trade), µ law (specified by Bell
Telephone) and vector sum-excited linear
prediction.




On the other hand, APR9600 singlechip voice recorder and playback device
from Aplus Integrated Circuits makes

Parts List
Semiconductors:
IC1
- APR9600 voice processor
IC2
- LM386 low-power audio
amplifier
T1-T3
- BC557 pnp transistor
D1
- 1N4001 rectifier diode
LED1-LED3
- Red LED
Resistors (all ¼-watt, ±5% carbon, unless
stated otherwise):
R1, R2, R4-R8,
R16, R17
- 100 kilo-ohm
R3, R10
- 390-ohm
R9
- 220-kilo-ohm
R11
- 1-ohm
R12(A)
- 33-kilo-ohm
R12(B)
- 5-kilo-ohm
R13, R14
- 4.7-kilo-ohm
R15
- 1-kilo-ohm
Capacitors:
C1, C3, C4, C6,
C8, C9, C11
C2
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