“ADPCM Speech Processor For Solid State Recorder

The M6258V is a complex and highly integrated ADPCM speech processor, implemented in CMOS technology for low power consumption. The integrated A/D and D/A converters make the chip more self-contained, relieving the need for external conversion circuitry. The device comprises internally. A DRAM controller permitting the use of DRAMs alternatively to SRAMs and ROMS to store speech data. In other words, less periphery, thus less system vulnerability a voice detection circuit and phrase select provision are successfully added features for increased performance.