GENERAL DESCRIPTION

The ST3024 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, audio playback, motion-JPEG playback, and JPEG-baseline decoder.

FEATURES

■ DSP based voice/audio processor nOperation voltage

– Core logic: 2.25V~2.7V

– 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 3MHz source

_ 12M~30MHz PLL output

■ Triple clock sources

_ Crystal..................................3MHz

_ External input...… … … … ......3MHz

■ 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

■ MCU interfaces

_ 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

_ AB-repeat

_ Time stretch (speed up x 2, speed down x 2)

_ Combine syllable

_ Encryption

_ Audio Playback (CBR, VBR – all bit rates)

_ Forward/backward play, AB-repeat

_ Spectrum gain

_ Time stretch (speed up x 1.5, speed down x 1.5)

_ Combine syllable

_ Encryption

_ Wav Playback

_ Forward/backward play, AB-repeat

_ Wav Record {(MS-ADPCM(3.8:1)}

_ Software AGC

_ Motion-JPEG playback

_ JPEG-baseline decoder

_ RS-Word, RS-PY

_ TTS