NSAM265SR Datasheet | National Semiconductor

NSAM265SR NSAM265SF pact SPEECH Digital Speech Processors PRELIMINARY November 1995 NSAM265SR NSAM265SF pact SPEECH TM Digital Speech Processors General Description The NSAM265SR and the NSAM265SF are members of National Semiconductor’s pact SPEECH Digital Speech processors family These processors provide Digital Answering Machine (DAM) functionality to embedded systems Both processors are based on the NSAM265 Unless specified otherwise all references to the pact.. SPEECH processor in this document apply to both the NSAM265SR and the NSAM265SF The pact SPEECH processor integrates the functions of a traditional Digital Signal Processing (DSP) chip and a 16bit pact RISCTM embedded Risc processor core The device contains system support functions such as DRAM Controller Interrupt Control Unit Codec Interface MICROWl RETM interface WATCHDOGTM timer and a Clock Generator The pact SPEECH processor operates as a slave peripheral that is controlled by an external microcontroller via a serial MICROWIRE interface In a typical DAM environment the microcontroller controls the analog circuits buttons and display and activates the pact SPEECH by sending it mands The pact SPEECH processor executes the mands and returns status information to the microcontroller The pact SPEECH firmware implements voice pression and depression tone detection and generation message storage management on-chip speech synthesis for time and day stamp and support for user-defined voice prompts in various languages The NSAM265SR pact SPEECH supports DRAM ARAM for message storage while the NSAM265SF supports FLASH AFLASH In all other respects the processors are identical The pact SPEECH implements echo cancellation techniques to support improved DTMF tone detection during message playback The pact SPEECH supports speech synthesis the technology used to create voice prompts from predefined words and phrases stored in a vocabulary The pact SPEECH...