Method and device for detecting the presence of one or more puls

Details Method and device for detecting the presence of one or more puls Method and device for detecting the presence of one or more puls

1979-08-21

1981-07-14

Smith, Jerry

Boots, shoes, and leggings

179 84VF, 328138, G06F 1520, G01R 2314

Patent

active

042790174

ABSTRACT:
According to the method of the invention two successive samples from each of two signal channels to be detected are alternately fed and not fed to the detection device. In consequence of this, fewer interference products are obtained, so that the processing time can remain relatively short. Moreover the two multi-frequency code samples (MFC-samples) of two channels can be processed simultaneously. A device (FIG. 3) examines on a time division basis the signalling time slots of two pulse code modulated frames of multi-channel signals (PCM-frames). Under the control of a microprocessor circuit (27) the pulse code modulated selected multi -frequency signal samples are processed in an input control circuit (28) when they are correlated with one another by being multiplied by sine and cosine reference series signals from a buffer (29). The correlation results are fed to accumulators (30, 33). Under the control of a second microprocessor circuit (40) the correlation results are compared in a processing circuit and transferred to the equipment that follows.

REFERENCES:
patent: 3882283 (1975-05-01), Proudfoot
patent: 3962645 (1976-06-01), Stewart
patent: 4068309 (1978-01-01), Drukarch
patent: 4109109 (1978-08-01), Mooleron

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