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ML2251/52/53/54/56-XXX, ML22Q54
 2-Channel Mixing Oki ADPCM Algorithm-Based
Speech Synthesis LSI
Documents
For complete details, contact the
nearest Oki Sales
Office or Representative.
Description
This
document contains minimum specifications. For full specifications, please
contact your nearest Oki office or representative. GENERAL DESCRIPTION The
ML2250 family is a 2-channel mixing speech synthesis device with an on-chip
voice data (i.e., phrases) storing mask ROM and a flash memory. Besides playing
the built-in voice data, this device can output voice data that is input from
outside the device. This ML2250 family allows to select the playback method from
the 8-bit PCM, non-linear 8-bit PCM, 16-bit PCM, 2-bit ADPCM2, and 4-bit ADPCM2
algorithms. And the sound volume is adjustable as well. The ML2250 family
incorporates a 14-bit D/A converter, low-pass filter, and 1-bit DAC (PWM
output). It is easy to configure a speech synthesizer by externally connecting a
power amplifier and a CPU to the ML2250 family. The ML2250 family line-up
includes 2 types of products: with on-chip mask ROM, and with on-chip flash
memory.
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ML2251/52/53/54/56-XXX
This is a CMOS single chip speech
synthesis device with an on-chip mask ROM. Products with several sizes of mask
ROMs are available in the ML2250 family depending upon the total playback time
length. |
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ML22Q54
The ML22Q54 is a speech synthesis device with a
4-Mbit flash memory built in. The voice data can be easily written to the flash
memory using a special tool. The on-chip flash memory product is suitable for
the diversified low volume production or short delivery time applications that
the on-chip mask ROM product cannot support. The ML22Q54 is most suitable for
evaluation because the circuit configuration is the same as the on-chip mask ROM
product. | A combination of fixed and variable messages
can be written because it is easy to write to the built-in flash memory. It is
also possible to store and read data, other than voice, to/from an area in the
flash memory not used as voice data.
Features
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Non-linear 8-bit PCM, 8-bit PCM, 16-bit PCM, 2-bit ADPCM2, and 4-bit ADPCM2
algorithms |
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Serial input/parallel input selectable |
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Phrase control table function i.e., user definable phrase
control table function |
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2 channels mixing function |
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Master clock frequency: 4.096 MHz |
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Sampling frequency: 4.0 kHz, 5.3 kHz, 6.4 kHz, 8.0 kHz, 10.7
kHz, 12.8 kHz, 16.0 kHz, 21.3 kHz, 25.6 kHz, 32.0 kHz, 42.7 kHz, 48 kHz
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Maximum number of phrases: 256 phrases |
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Sound volume adjustment function built in (2 sounds
independently adjustable in 29 steps) |
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External voice data can be input |
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1-bit D/A converter, and14-bit D/A converter built in
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Built-in low-pass filter: Digital filter |
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Package: 44-pin plastic QFP (QFP44-P-910-0.80-2K)
(ML2251-XXXGA/ML2252-XXXGA/ML2253-XXXGA/ML2254-XXXGA/ML2256-XXXGA/ML22Q54GA-MC)
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