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PDF VP-1608F Data sheet ( Hoja de datos )
| Número de pieza | VP-1608F | |
| Descripción | Digital Voice Processor | |
| Fabricantes | Eletech Enterprise | |
| Logotipo |  |
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VP-1608F
Digital Voice Processor
FEATURES
! Plays messages stored in external EPROM chips
! CVSD technique with adjustable sampling rate from
16K to 128K bps for different voice quality
! Dual-channel audio output
! Up to 64 segments per channel
! Built-in RC oscillator or use external clock
! Direct EPROM addressing up to 8M bits
! Low power, single voltage operation
! Microprocessor interface
! Low-cost VP-880 system available for quick and easy
voice development
GENERAL DESCRIPTIONS
The VP-1608F is a CMOS voice processor chip based on
the CVSD (Continuously Variable Slope Delta) modulation
technique. The VP-1608F is exactly the same as the (now
obsolete) VP-1608 except that it is packaged in 64-pin QFP
instead of 68-pin PLCC.
Note that although the dual channel output provided by
the VP-1608F can be used as a stereo output, it will be
hard to do so since the VP-880 Voice Development System
does not allow voice digitization in stereo mode.
VP-1608F (QFP44) Pin Assignment
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 while channel B plays short
sound effects based on the player’s action.
The dual channel output is available on two separate out-
put pins. They can be used independently, or mixed to-
gether 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-1608F can operate in a wide range of sampling
rates (from 16 to 128 Kbps). A higher sampling rate usu-
ally 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-1608F
based design. The VP-880 Voice Development System is
available for quick and easy in-house voice development.
APPLICATIONS
! Dual channel, multiple message playback
! Sound effects generator
! Digital announcer for consumer, industrial, security and
telecommunication products
Eletech Enterprise Co., Ltd.
531-3F Chung-Cheng Road
Hsin Tien, Taipei Hsien, Taiwan
Tel:+886 2-2218-0068 Fax:+886 2-2218-0254
www.eletech.com
Eletech Electronics, Inc.
16025 Kaplan Avenue
Industry, CA 91744, U.S.A.
Tel: (626) 333-6394 Fax: (626) 333-6494
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
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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.
VOICE VP-1608..........................................................................................5
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