Description: The HM2007 Speech Recognition IC performs speech recognition independently in a stand alone mode, or it can function as a slave to a host processor in CPU mode. In stand alone mode, the circuit can recognize up to 40 words lasting one second each.
The chip provides the options of recognizing either forty .96 second words or twenty 1.92 second words. This circuit allows the user to choose either the .96 second word length (40 word vocabulary) or the 1.92 second word length (20 word vocabulary). For memory the circuit uses an 8K X 8 static RAM.
The chip has two operational modes; manual mode and CPU mode. The CPU mode is designed to allow the chip to work under a host computer. This is an attractive approach to speech recognition for computers because the speech recognition chip operates as a co-processor to the main CPU. The jobs of listening and recognition doesn't occupying any of the computer's CPU time. When the HM2007 recognizes a command it can signal an interrupt to the host CPU and then relay the command code. The HM2007 chip can be cascaded to provide a larger word recognition library.
Features of HM2007 IC Chip are as follows:
- Single chip voice recognition CMOS LSL.
- Maximum 40 words can be recognized for one chip.
- External 64K SRAM can be connected directly.
- Maximum 1.92 sec of word can be recognized
- A microphone can be connected directly
- Speaker- dependent isolates-word recognition system
- Multiple-chip configuration is possible
- Two control mode is supported: manual mode & CPU mode.
- Response time: less than 300ms
- 5V single power supply
- 45-pin PDIP, 52 pin PLCC, 48 pad bare chip.