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VOICE

Eletech Electronics, Inc.

16019 Kaplan Avenue

Industry, CA 91744, U.S.A.

Tel: (626) 333-6394 Fax: (626) 333-6494

Eletech Enterprise Co., Ltd.

531-3F Chung-Cheng Road

Hsin Tien, Taipei Hsien, Taiwan

Tel:+886 2-2218-0068 Fax:+886 2-2218-0254

http://www.eletech.com

FEATURES

n Plays messages stored in external EPROM chips

n CVSD technique with adjustable sampling rate from

16K to 128K bps for different voice quality

n Dual-channel audio output

n Up to 64 segments per channel

n Built-in RC oscillator or use external clock

GENERAL DESCRIPTIONS

The VP-1608 is a CMOS LSI speech processor chip based

on the CVSD (Continuously Variable Slope Delta) modula-

tion technique. The VP-1608 not only combines the func-

tions of the VP1000 and the VP1600 together, but also

provides extended direct EPROM addressing (up to 8M

bits) and dual-channel audio output.
Note that although the dual-channel output provided by

the VP1608 can be used as a stereo output, it will be hard

to do so since the VP-880 Voice Development System does

not allow stereo voice digitization.

VP-1608

Digital Voice Processor

VP-1608 (PLCC68) Pin Assignment

n Direct EPROM addressing up to 8M bits

n Low power, single voltage operation

n Microprocessor interface

n Low-cost VP-880 system available for quick and easy

voice development

Therefore the dual-channel output is usually used in appli-

cations where sound synchronization is not critical. For

example, in a game equipment, channel A can be playing

a continuous background sound when channel B plays

short sound effects based on the player's action.
The dual-channel output is available on two separate

output pins. They can be used independently, or mixed

together externally. Each channel may control up to 64

sound segments stored in 4 different EPROM banks, with

up to 16 segments in each bank.
Each segment stored in the EPROM is represented by a

unique binary code: 2 bits for the bank code and 4 bits for

the segment code. A valid code plus a strobe signal are all

it takes to activate a certain segment.
The VP-1608 can operate in a wide range of sampling rates

(from 16 to 128 Kbps). A higher sampling rate usually

produces better sound quality at the expense of higher

memory cost. As a rule of thumb, start with 32 Kbps. A 1M

EPROM can store 32 seconds of sound at this rate.
Thanks to the chip's high internal integration, very little

external components are required to build a VP-1608

based design. The VP880 Voice Development System is

available for quick and easy in-house voice development.

APPLICATIONS

n Dual channel, multiple message playback

n Sound effects generator

n Digital announcer for consumer, industrial, security

and telecommunication products

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage, V

- V

.................................. 0 to 5.5V

Input Volotage, V

........................................... V

to V

Operating Temperature, T

...................... -10

C to 60

Storage Temperature, T

.......................... -20

C to 80

* Stresses above those listed under "Absolute Maximum

Ratings" may cause permanent damage to the device. This

is a stress rating only and functional operation of the

device at these or any other conditions above those

indicated in the operational sections of this specification

is not implied.

ELECTRICAL CHARACTERISTICS

Symbol

Parameter

Min.

Typ.

Max.

Units

Supply Voltage

4.5

5.5

Standby Current

DRIVE

Output Current V

=2.4V

SINK

Output Current V

=0.4V

Input Voltage (High)

3.5

Input Voltage (Low)

1.5

Internal Scan Clock

MHz

Sampling Clock

128

KHz

RESET

Reset Pulse Width

Strobe Input Pulse Width

SIE

Strobe Inhibit Time After EOS

(1)

1.5

DSP

Delay Time From Strobe To Play

(2)

150

Edge-Triggered Reset Interval

Data Setup Time For INA ~ INF

350

Data Hold Time For INA ~ INF

Internal Load Pulse For INA ~ INF

ECS

Address Valid Time For Ch. B EPROM

250

READ

Internal Latch Pulse For Ch. B EPROM Data

Address Stable Time For Ch. B

125

Note:
(1) EOS = End-Of-Speech
(2) Based on 1M EPROM scanning.

VP-1608..........................................................................................2

VOICE

PIN DESCRIPTIONS

A0 ~ A19:

Address output to EPROM. Both channels share the same

address lines in a 50-50 time sharing fashion. Pin ECS

(described below) must be examined to tell who's address

is valid at any particular moment.
ANG1 & ANG1\:

Differential audio output for channel A, connect to LM324

or LM358.
ANG2 & ANG2\:

Differential audio output for channel B, connect to LM324

or LM358.
ANGD1:

Audio feedback input for channel A.
ANGD2:

Audio feedback input for channel B.

D0 ~ D7:

Data input from EPROM.
ECS:

EPROM Channel Select output. This signal is used to

indicate who's address is on the address lines. When the

ECS is low, the address is for channel A. When the ECS is

high, the address is for channel B.
If both channels share one EPROM, this signal is usually

connected to the highest address line so that each channel

uses exactly half the EPROM space. If more than one

EPROM are used, this signal is usually used by the address

decoder to select the proper EPROM.
ENV1:

Envelop input for channel A, to be connected to INT1 with

a feedback resistor.

VP-1608..........................................................................................4

VOICE

CHA

SEGMENT CONTROL

BANK

CONTROL

CHB

SEGMENT CONTROL

CHA & CHB

TIME SHARING

CIRCUIT

CHA CLOCK &

ADDRESS GENERATOR

HIGH SPEED

SPINNER

CHB CLOCK &

ADDRESS GENERATOR

CHA CVSD

DEMODULATOR

CHA

FLAG

RECEIVER

CHB

FLAG

RECEIVER

CHB CVSD

DEMODULATOR

ADDRESS

MULTIPLEXER

ANGD1

ANG1

ENV1

INT1

ANGD2

ANG2

ENV2

INT2

D0 ~ D7

ECS

A0 ~ A19

OSC1 & OSC2

I/O2

RESET2

INE, INF

SE, SF

INA ~ IND

I/O1

RESET1

VCC

VDS

VAS

Block Diagram

VP-1608..........................................................................................5

VOICE

ENV2:

Envelop input for channel B, to be connected to INT2 with

a feedback resistor.
INT1:

Integrator output for channel A, to be connected to an

external RC integration circuitry.
INT2:

Integrator output for channel B, to be connected to an

external RC integration circuitry.
I/O1:

Strobe input/Busy output for channel A, active low. To

play a message on channel A, place the segment/bank

code on INA to INE and strobe this pin with a low pulse.

During the playback this pin becomes an active-low "busy"

output. If this pin is held low at the end of playback, the

message will be re-triggered.
I/O2:

Same as I/O1 except that this pin is for channel B.
INA ~ IND:

Input for segment code in binary format. INA is the LSB

and IND is the MSB.
INE, INF:

Input for bank code in binary format, max. 4 banks. INE is

the LSB and INF is the MSB.

OSC1, OSC2:

Internal oscillator pins for external RC components. It

external clock source is to be used, feed it through the

OSC2 pin. Note that both channels share the same clock,

so their sampling rate must be the same.
RESET1:

Reset input for channel A, active low. On the falling edge

of this reset signal, channel A playback is stopped and all

internal counters for channel A are cleared.
RESET2:

Reset input for channel B, active low. On the falling edge

of this reset signal, channel B playback is stopped and all

internal counters for channel B are cleared.
SCK, TEST:

For factory use only, do not make any connection.
SE, SF:

Output for EPROM bank select. These two pins are actually

latched outputs for INE and INF.
VDD:

Input, supply voltage.
VDS & VAS:

VDS is digital ground and VAS is analog ground. Connect

the two grounds together close to the power source to

minimize noise.

APPLICATION NOTES

1. EOM (End Of Message) Flag

The EOM flag consists of six consecutive bytes of "AA", or

"10101010" in binary format. After a trigger signal is

received, the VP-1608 uses the internal 8MHz system clock

to scan through memory space and finds the correct

message by counting the number of EOM flags. For

example, to find the 5th message, it must scan through

each and every memory location until it finds 4 EOM flags.

The first byte following the 4th EOM flag is the first byte

of the 5th message.
2. Creating Master EPROM File on the VP-880 System

Follow these steps to create the master EPROM file:
1. To maximize the EPROM usage, arrange your sound

segments in banks of 16 or less, so that the total combined

length for each bank is about the same. Do not mix

channel A and channel B together.
2. Based on the total combined length of the largest bank,

select a highest sampling rate that will fully utilize the

EPROM. Use the following equation:

Sampling Rate (Kbps) =

EPROM Size (K-bits) / Total Length (Second)

3. Digitize and edit each segment as a separate file. Use

the "ROM Data Management" function to combine up to

16 messages into a "bank file". The first filename entered

in the "ROM Data Management" is the first segment in that

bank, and etc.
4. Depending on the hardware design, each EPROM chip

may contain one or more sound banks. It is also possible

to use just one EPROM to store all sound segments of both

channel A and channel B. If you need to combine several

bank files into one for programming into one EPROM chip,

use the following DOS command:
COPY /b file_1+file_2+..+file_n destination_file
Do not use the "ROM Data Management" function to

combine bank files, otherwise each bank file will be

considered as a single message file.

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: VP-1608

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: VP-1608