Specifications

28 System Overview
The assembly can install into any of the following components.
• BA23 pedestal or single-box rack
• BA123 world box
• H9642 cabinets
2.3 Functional Description
This section describes how the DTC04 module and the TLI assembly
operate.
2.3.1 DTC04 Module
The DTC04 module consists of three functional blocks: the main
processor, signal processor, and Q-bus interface. These blocks
communicate through interrupts and 64 Kbyte windows into the main
processor’s 1 Mbyte memory space.
Main Processor
The main processor consists of an 8 MHz Intel 80186 microprocessor
coupled to the 1 Mbyte shared memory. The main processor performs the
following functions:
• Controls communication with the host system.
• Implements the text-to-vocal tract control portion of text-to-speech
translation.
• Performs buffer management for speech recording and playback.
• Processes that part of speech recognition that is not handled by the
signal processor.
Signal Processor
The signal processor consists of a Texas Instruments TMS320C25 or
TMS320 family digital signal processor, 64 Kbytes of high-speed static
random access memory, and a shared-memory interface. The shared-
memory interface provides communication between the main processor
and signal processor. The signal processor performs the following
functions:
• Implements the vocal tract model that the text-to-speech system uses.
• Compresses and expands stored speech.