A D6305B EASYTAD Chip for an All- Digital Telephone Answering Machine VOICE PROMPT ROM Analog I/O 16M ARAM D6305B OR HOST controller 4M ARAM Figure 1. D6305B Block Diagram The D6305B chip is a digital speech/signal processing subsystem that implements all of the functions of speech compression, telephone line signal processing, memory management, and TRUESPEECH natural sounding voice prompting for an all digital answering machine. The D6305B is fully controlled by the system host through a simple interface protocol. The host controller provides activation and control of all system functions such as speech recording and playback, DTMF and tone generation, DTMF and call progress tone detection, and voice prompting. The fully digital solution has no moving parts, yielding high reliability. The chip’s programmability enables a full range of answering device features for the end user. The D6305B is a single-chip, digital signal processor that includes all of the necessary circuitry to interface with an external HOST, memory, and an analog front end. FEATURES • • • • • High-quality, variable low rate TRUESPEECH digital speech compression allowing 14-15 minutes of recording time per each 4 MB ARAM (Audio grade DRAM) Flexible storage of incoming messages (ICM) and outgoing messages (OGM). Supports multiple OGMs and multiple mailboxes TRUESPEECH natural-sound voice prompting, for Day/Time stamp and voice instructions DTMF generation and detection with near-end echo cancellation for superior performance Fully backwards compatible with D6305A. Host software compatible, pin-to-pin replaceable 6050302.2 • • • • • • • • Uses more relaxed ARAM specifications (standard ARAM) Will work with 1M x 4 (4MB) or 4M x 4 (16 MB) ARAMs Supports “offset playback” for jumps within a message Programmable Tone Generation and Tone Generation from tables 8-bit parallel HOST interface Storage of 32 telephone numbers for speed dialing Low power consumption Special commands for production line testing DSP GROUP, INC., 3120 SCOTT BLVD., SANTA CLARA, CA 95054 PH: 408-986-4300 FAX: 408-986-4323 EASYTAD - D6305B Product Overview CHIP CONFIGURATION • D6305B-11 Digital Speech Processor (80-pin PQFP) − 1 each ADDITIONAL SYSTEM COMPONENTS (supplied by the customer according to DSP Group’s specifications) • • D0000-29 Analog I/O Interface (16-pin DIP) − 1 each D0000-35B 4-MB ARAM Message Memory (SOJ) or D0000-36B 16-MB ARAM − Up to four devices per chipset - Up to two devices per chipset NOTES For Voice Prompt storage an external EPROM/ROM (access time of 400ns or less) is required. Each 16K x 8 block will support 19.5 seconds of voice prompt, up to 64K x 8 (for up to 78 seconds of voice prompt). TECHNICAL SPECIFICATIONS PARAMETERS Voice Bandwidth Voice Recording Time DTMF Detection Signal Level Accept Duration Reject Duration VOX Detection Level VCC Supply ICC Supply Current, Operating Mode Power Down Mode Operating Temperature Range Crystal Package MIN/TYP/MAX typical minimum minimum maximum minimum typ typ typical DATA 300-3,400 Hz 15 - 17 minutes COMMENTS 4 MB of ARAM storage -35 dB * 40 ms 23 ms -37 dB * 5V±10% 45 mA 3.5 mA 0° C to 70° C 29.4912 MHz 80-pin PQFP * 0.707 VRMS is defined as the 0 dB0 A DSP Group, Inc. 3120 Scott Boulevard Santa Clara, CA 95054 Tel: (408) 986-4300 Fax: (408) 986-4490 DSP Group Europe 18 rue de l’effort mutuel 91300 Massy France Tel: (33) 6-0768-6754 Fax: (33) 1-6010-5187 DSP Group Japan Koizumi Building - Sixth Floor 1-29-1, Nishi Gotanda Shinagawa-Ku Tokyo 141, Japan Tel: (81) 3-5496-1611 Fax: (81) 3-5496-1615 DSP Solutions, LTD. Unit 1923, 19/F Metro Centre 1 32 Lam Hing Street, Kowloon Bay Kowloon, Hong Kong Tel: 852-2750-7325 Fax: 852-2305-0640 DSP Technology, LTD. # A-1216, Champs-Elysse Center 889-5, Daechi-Dong, Kangnam-Ku Seoul, 135-280, Korea Tel: 822-554-7494 Fax: 822-554-7495 DSP Application, LTD. 10F-5, No. 333 Fu Hsing N. Road Taipei, Taiwan, R.O.C. Tel: 886-2-545-1892 Fax: 886-2-546-0899 TRUESPEECH is a registered trademark of DSP Group, Inc. 6050302.2 DSP GROUP, INC., 3120 SCOTT BLVD., SANTA CLARA, CA 95054 PH: 408-986-4300 FAX: 408-986-4323