Multi-channel or split-frequency, low frequency, telemetry circuit and method between transmitters and receivers
First Claim
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1. A digital telemetry system, comprising:
- a low frequency transmitter including an oscillator controlled synthesizer which is a software direct synthesis providing a 4-phase output based on a predetermined fixed frequency look up table; and
a low frequency, narrow bandwidth, receiver, said receiver comprising;
a buffer amplifier which receives an input signal and provides an amplified output signal;
a bandpass filter which receives the output signal from the buffer amplifier and provides a filtered frequency signal, said bandpass filter being adjustable for selection of a center channel frequency based on programmed operation of a decoder;
a squelch switch which receives the filtered frequency signal from the bandpass filter and provides an output signal having a high signal to noise ratio;
a mixer circuit which receives inverted and non-inverted signals from the squelch switch, as well as 4-phase output signals from a synthesizer in order to perform coherent detection with an increased sensitivity and to provide an output signal which is the rectification of base band data;
an adjustable lowpass filter which receives the output signal from the mixer and provides a filtered output signal; and
a window detector circuit which receives the filtered output signal and provides a receiver output signal.
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Abstract
A multi-channel system is provided for both wide-band and narrow band low frequency transmission/reception of digital telemetry. The multi-channel system uses coherent detection having a high selectivity, and a quadrature detector having a high sensitivity. A filter is provided to average out noise. The multi-channel system oscillator is software controlled for scanning/multiplexing. The multi-channel system is used for data transmission over inductive, infrared, sonic and cable links.
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Citations
3 Claims
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1. A digital telemetry system, comprising:
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a low frequency transmitter including an oscillator controlled synthesizer which is a software direct synthesis providing a 4-phase output based on a predetermined fixed frequency look up table; and
a low frequency, narrow bandwidth, receiver, said receiver comprising;
a buffer amplifier which receives an input signal and provides an amplified output signal;
a bandpass filter which receives the output signal from the buffer amplifier and provides a filtered frequency signal, said bandpass filter being adjustable for selection of a center channel frequency based on programmed operation of a decoder;
a squelch switch which receives the filtered frequency signal from the bandpass filter and provides an output signal having a high signal to noise ratio;
a mixer circuit which receives inverted and non-inverted signals from the squelch switch, as well as 4-phase output signals from a synthesizer in order to perform coherent detection with an increased sensitivity and to provide an output signal which is the rectification of base band data;
an adjustable lowpass filter which receives the output signal from the mixer and provides a filtered output signal; and
a window detector circuit which receives the filtered output signal and provides a receiver output signal. - View Dependent Claims (2, 3)
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Specification
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Current AssigneeAcumen Associates Incorporated (Roper Technologies, Inc.)
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Original AssigneeAcumen Associates Incorporated (Roper Technologies, Inc.)
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InventorsSham, Ka Yiu, Wong, Philip Lim-Kong
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Primary Examiner(s)LEGREE, TRACY MICHELLE
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Application NumberUS09/179,881Time in Patent Office1,154 DaysField of Search455/500, 455/212, 455/575, 455/73, 455/91, 455/213, 455/218, 455/222, 455/266, 455/326, 455/334, 455/339, 455/260, 455/255-258, 455/263, 455/265, 379/106.01, 375/145, 340/870.11, 331/4, 331/9, 331/16, 331/31, 331/32, 331/34, 331/42, 331/DIG.2, 381/4US Class Current455/500CPC Class CodesG08C 17/02 using a radio linkH04L 5/06 the signals being represent...Y10S 331/02 Phase locked loop having lo...
