MSP53C691

The MSP53C691 is a standard slave synthesizer from Texas Instruments that accepts compressed speech data from other microprocessors/microcontrollers and converts it to speech. This allows the TI MSP53C691 to be used with a master microprocessor/microcontroller in various speech-related products such as security systems, learning aids, games, and toys. High quality, low bit-rate coders, easy interface with the master microcontroller, digital gain control, low power sleep mode, and low voltage operation makes this device ideal for products requiring long duration speech, less development cycle times, and peripheral device control through the slave device.

This device supports several speech synthesis algorithms that permit tradeoffs to meet the price performance requirements of various markets. The MSP53C691 implements a unique feature of playing a single channel FM music along with CELP or MELP speech data concurrently. This feature allows the user to speak a certain phrase in MELP or CELP with single channel music in the background.

The MSP53C691 is optimized to support a 4-bit wide data transfer protocol. The device has two status bits andthree control bits that control the communication protocol between the master and the slave. The MSP53C691 also has 1 bit (command/data) which differentiates between a command or speech data feeding into the slave.

In 4-bit mode, various commands are sent to the slave during speech to perform various tasks.

The MSP53C691 also supports the 8-bit wide data transfer but the support for commands is disabled during speaking-a-phrase. When speaking-a-phrase in 8-bit mode is complete, the MSP53C691 switches back to the 4-bit mode to receive the next command. Switching between 4-bit mode or 8 bit mode is permitted between speech data files.