PSB 2168

General General The PSB 2168 provides a solution for an embedded answering in an IOM®-2 based system.

The chip PSB 2168 features recording by DigiTape™, a family of high performance algorithms. Messages recorded with DigiTape™ can be played back with variable speed without pitch alteration. Messages recorded with a higher bitrate can be converted into messages with a lower bitrate arbitrarily. Current members of DigiTape (TM) span the range from 3.3 kbit/s to 10.3 kbit/s.

Furthermore the PSB 2168, V2.1 has a a caller ID decoder, DTMF recognition and generation and call progress tone detection. The frequency response of cheap microphones or loudspeakers can be corrected by a programmable equalizer.

Messages and user data can be stored in ARAM/DRAM or flash memory which can be directly connected to the PSB 2168. The PSB 2168 also supports a voice prompt EPROM for fixed announcements.

The PSB 2168 provides an IOM®-2 compatible interface with two channels for speech data.

Alternatively to the IOM®-2 compatible interface the PSB 2168 supports a simple serial data interface (SSDI) with separate strobe signals for each direction (linear PCM data, one channel).

The chip PSB 2168 is programmed by a simple four wire serial control interface and can inform the microcontroller of new events by an interrupt signal. For data retention the PSB 2168 supports a power down mode where only the real time clock and the memory refresh (in case of ARAM/DRAM) are operational.

The PSB 2168 supports interface pins to +5 V levels.