Registers – Transfer mechanism – Traveling pawl
Patent
1975-10-14
1977-05-03
Smith, Jerry
Registers
Transfer mechanism
Traveling pawl
23515131, 324 78D, 324 79D, 328134, 328138, G01R 2302, G01R 2314
Patent
active
040216535
ABSTRACT:
An improved detection arrangement for detecting the presence of a given tone in a received input signal. A reference generator, in the form of a reference clock and a programmable divider, produces a first reference frequency, equal to the frequency of the tone, and at an arbitrary phase angle thereto. A second generator output is in quadrature to the first. Each reference signal is product detected with the input signal via exclusive OR gates.
A unique digital low pass filter, operating in a time multiplex mode, receives the gate outputs, removes all high frequency components therefrom, and produces pairs of output binary number encoded signals, each of which is representative of a vector component of a detected tone. Threshold detector circuitry monitors the outputs indicating an above threshold condition at its output in response to predetermined combinations of the binary numbers. The combinations represent all input vectors whose resultant absolute magnitude exceeds a chosen threshold.
A second detector samples the threshold detector output, recording the number of samples over threshold during a given interval. If the number exceeds a selected minimum an output signal is produced which indicates the presence of a received tone.
REFERENCES:
patent: 3568067 (1971-03-01), Williford
patent: 3636446 (1972-01-01), Genter et al.
patent: 3701012 (1972-10-01), Lang
patent: 3764924 (1973-10-01), Caplan et al.
patent: 3812432 (1974-05-01), Hanson
patent: 3820021 (1974-06-01), Clarisse
Sharp Ronald Edward
Willard David Frank
Hamley James P.
King Patrick T.
Motorola Inc.
Smith Jerry
Southard Donald B.
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