MX93031A

· High-quality (12.8kbps) speech compression/decompression algorithm for message recording/playback.Recording time can be about 21.7 minutes in one 16M bits DRAM.
· Low (4.8kbps) compression rate with silence management technique for voice prompt making.
· Support total 127 messages, maximum 7 OGMs and maximum 8 personal mailboxes.
· Support internal/external voice prompt. Up to 13K words on-chip maskable ROM space for system coding and internal voice prompt.
· DTMF generation and detection with near-end echo cancellation.
· Control code can be masked in; external mP is not required in DAM with full-duplex speakerphone system.
· Provide single low crystal solution (FLL).
· Provide standard sample program for customer development.
· Dual-Codec interface is provided
· Full duplex speaker phone with both acoustical echo canceller (AEC) and line echo canceller (LEC)
· Built-in CAS signal detector for monitoring the presence of CPE alerting signal in Calling Identity Delivery on Call Waiting.

· The MX93031A is an engine chip on which digital answering machine (DAM) with full duplex speakerphone is implemented. Besides, CAS tone detection capability for call-waiting in Caller-ID service has also been implemented as well.
· It provides speech processing / management modules, including speech compression/decompression, silence management, telephone line signal processing, internal-ROM voice prompt, ARAM management, line echo cancellation and acoustical echo cancellation, etc.
· By using this MX93031A, users do not need external microprocessors and can effectively reduce the overall system cost in DAM with full-duplex speakerphone system.