Serial digital bit stream code detector

Details Serial digital bit stream code detector Serial digital bit stream code detector

1975-06-16

1977-11-29

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

179 15BS, 325419, 328 75, H03K 13256

Patent

active

040607976

ABSTRACT:
A code detector for detecting the presence or absence of particular binary digital signalling codes in the digital bit stream from extension telephones of a digital PABX telephone system. The detector is connected to a telephone being monitored and receives digital data from the telephone, which data may be random speech data or a signalling code. The detector consists essentially of a ROM which uses each of the data bits arriving in serial form as the least significant bits of the address for a micro-program stored in the ROM which provides the other address bits, thus causing the program to be stepped through a sequence of addresses which depend upon the sequence of the incoming data bits. For a program to end up at a specified address the ROM must receive the code which is unique in causing the program to arrive at that address. The detector then outputs a code representative of the detected code.

REFERENCES:
patent: 3790821 (1974-02-01), Adamson
patent: 3818143 (1974-06-01), Vrba et al.
patent: 3851109 (1974-11-01), Downs et al.
patent: 3873781 (1975-03-01), Nissim
Susskind, "Notes on Analog-Digital Conversion Technique," The Technology Press, MIT, 1957, pp. 27-29.
Susskind, Notes on Analog-Digital Conversion Techniques, Technology Press, MIT, 1957, pp. 4-27 to 4-29 & 4-32.
Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/72, pp. 1-8.

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