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TI's new family of processors for digital telephone answering devices (DTADs) doubles message recording time to 28 minutes. This new product family of DTAD processors enables full-duplex speakerphone, caller ID, and caller ID on call waiting functions.
The TMS320 DSP-based family of DTAD processors offer advanced speech compression software and interface directly to Samsung and Toshiba NAND flash memory. The MSP58C81x and MSP58C83x families offer 45 I/O lines, an 8-bit A/D convertor with 3 multiplexed input lines, 20k words of internal ROM, 1.3k words of internal RAM, all built around a standard TMS320C25 DSP core. The MSP58C81X allows 14 minutes of record time with 4 MB of memory while the MSP58C83X family recording time climbs to 28 minutes with 4 MB of memory. Both families provide NAND flash interface.
Complete software modules for advanced features such as caller ID, caller ID on call waiting, and full-duplex speakerphone are also available. With these software modules, as well as customer-developed software, additional features and system control functionality can be masked into on-chip ROM. Also, by integrating system-control software onto the DSP, a microcontroller device that might otherwise be used for system control can be eliminated entirely, reducing significantly the system's hardware costs. Custom-developed software also offers DTAD vendors the opportunity to incorporate differentiated capabilities into their systems.
The MSP58C83X family of DTAD processors is compatible with TI's advanced MELP (Mixed Excitation Linear Prediction) voice compression algorithm that is capable of recording times of 28 minutes with 4 MB of ARAM or NAND flash memory. Unlike competing vocoders (voice coder/decoder software) that use silence compression to achieve unpredictable recording times, MELP uses fixed-rate compression at 2.4K bps to achieve 28 minutes of very high quality voice recording.
The MSP58C83X is available in 100-pin quad flat packs (QFP) at US $6.85 in 100,000-unit pricing, while the MSP58C81X, also in 100-pin quad flat packs (QFP), is US $6.35 in 100,000-unit pricing.