Re: Speech Recognition using Butterworth filters

I'm aiming for the chip to recognize four commands
Google for old products:
* VRC008 by Interstate Corp. in 1981
singlechip / speakerindependent / 16 words
It was basically a Motorola MC6804P2 8 Bit Controller with
firmware in the 1,2kByte ROM. RAM was 64 byte.
Description of the software is in US Patent 4.388.495
Not much on the analog frontend there.
There was an evaluation-kit ELV008 with 12 words, but VRC008
probably never got into production.
* remake: VCP200 by Voice Control Products Inc early 90ies
Sold by Archer, from time to time at ebay.
You guessed it: Motorola MC6804J2 1kByte ROM, RAM 30 byte.
Speakerindependent fixed vocabulary 2-5 words for robots:
"yes on ; on off ; go turn-right left-turn reverse stop"
In the datasheet there is the analog circuit.
* remake of remake:
Stewart "low-cost Voice Recognition" Circuit Cellar Ink Feb. 1998
You will find the article on www plus the Intel-Hex
for the controller.
As usual: Motorola MC68HC705J1A 1kByte ROM, RAM 64 byte.
This time a serial external EEPROM from Ramtron 24LC04 ( exotic:
was selected because external "RAM" was needed )
was used to store the vocabulary. Therefore no longer speaker-
independent but trainable ( i don´t think thats a good choice ).
* remake of remake ( of remake ): "Mandar Gokhale V0.1"
Yes almost 10 years are gone, its time for another one.
Please note Motorola now is called Freescale, but the 68HCS908
is waiting...

The analog frontend in all of these variants is more or less identical.
It produces after (double-)differentiation a zero-crossing bitstream.
Therefore the controller did not need an A/D-converter only a timer
that was controlled by a portpin.

MfG JRD
.

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