ST
ST3004
Speech Decoder/Encoder
Notice: Sitronix Technology Corp. reserves the right to change the contents in this document without prior notice. This is not a final specification.
Some parameters are subject to change.
1. FEATURES
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DSP based voice/audio processor
Operation voltage
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Core logic: 2.25V~2.7V
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I/O pads: 3.0V~3.6V
Voltage regulator for core logic
Low Voltage Reset (LVR)
_ 2.5V low voltage reset
One PLL to generate high system frequency from a
4MHz source
_ 12M~28MHz PLL output
Tow clock sources
_ Crystal...........................................................4MHz
_ External input...…
… … … … … … … … … …
......4MHz
Low power down current
_Typical current: 3uA
One 16-bit programmable Timer
One clocking output
One external interrupt
_ Edge/level trigger supported
One 14-bit direct-drive DAC
–
Maximum current: 145mA
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MCU interfaces
_ Serial mode
_ Parallel mode
Two Serial PORT interfaces(SP)
_ Programmable data length from 8-bit to 16-bit
_ I2S, Left/Right Justified interfaces to external DAC/ADC
Speech playback/recorder
_ Low Bit Rate Compression (LBRC)
_ 1.2K/1.6K/2.4Kbps@8KHz playback
_ 1.6K/2.2K/3.3Kbps@11.025KHz playback
_ High Bit Rate Compression (HBRC)
_ 12K/16K/24Kbps@8KHz playback
_ 16.5K/22K/33Kbps@11.025KHz playback
_ 24K/32K/48Kbps@16KHz playback
_ 12k/16k/24kbps@8KHz encoder
_ PCM playback
_ TTS
_ LPC
_ RS-Word
_ RS-PY
_ Time stretch (half~double speed)
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2. GENERAL DESCRIPTION
The ST3004 is a highly integrated and cost-effective DSP
based audio processor for various consumer applications. It
consists of one powerful DSP for advanced voice decoder and
encoder algorithms of natural speech with less memory. It
provides low bit rate compression (LBRC) for voice playback
and high bit rate compression (HBRC) for audio or better voice
quality. Both LBRC and HBRC can playback simultaneously.
For encoder, it has capability to compress PCM raw data from
MCU and send back encoded data to MCU. TTS, LPC,
RS-Word, and RS_PY algorithms are also available for various
voice applications. ST3004 can adjust playback frequency
(half~double speed) without pitch shifting.
System clock comes from 4MHz crystal or external input.
ST3004 has 32 I/Os and these can be either GPIO or
functional pins. Each pin can be programmed to input or output.
One external interrupt pin can be requested by external
devices.
One internal 14bit DAC can provide significant volume
equipping with internal amplifier. For particular application or
recorder, two general audio interfaces are supported to
interface with external DAC/ADC. Audio interface can be
configured to I2S or Left/Right Justified compatible mode.
There are serial and parallel interfaces for various connections
with different MCUs.
Ver 0.8
1
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11
2007-06-12
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
