Circuit for separating one type signal component from another
First Claim
1. A signal component separating circuit receptive of a time varying signal having, in amplitude, a pulsing component coexisting with a reciprocating component where it is desired to utilize the pulsing component, comprising in combination:
- a comparator; and
first and second channels, each receptive of said signal and coupled to respective inputs of said comparator, each of said channels comprising a unity gain amplifier having an input connected to receive said signal and an output and further comprising a peak detection and holding circuit (PDH), the input of which is connected to said output of said unity gain amplifier, each PDH comprising a charging and discharging circuit, wherein the second channel charging and discharging circuit has a faster charging and discharging time than the first channel charging and discharging circuit and wherein the second channel PDH attenuates the input signal more than the first channel PDH such that the first channel signal at said comparator is greater in magnitude than said second channel signal at said comparator except when pulses of said pulsing component are present whereby said comparator is responsive to the first and second channel signals for producing an output signal corresponding to the presence of said pulses.
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Accused Products
Abstract
A signal component separating circuit is responsive to a signal having a pulsing component and a reciprocating component for providing a signal corresponding to the pulsing component. The circuit includes first and second channels the outputs of which are coupled to respective inputs of a comparator circuit which produces the signal corresponding to the pulsing component of the input signal.
Each of the channels includes a peak detection and holding circuit which includes a charging and discharging circuit. The second channel peak detection and holding circuit has a faster charging and discharging time than the first channel peak detection and holding circuit. The second channel peak detection and holding circuit attenuates the input signal more than the first channel peak detection and holding circuit. As a result the signal in the first channel is greater in amplitude than the signal in the second channel except when the pulses are present.
22 Citations
11 Claims
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1. A signal component separating circuit receptive of a time varying signal having, in amplitude, a pulsing component coexisting with a reciprocating component where it is desired to utilize the pulsing component, comprising in combination:
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a comparator; and first and second channels, each receptive of said signal and coupled to respective inputs of said comparator, each of said channels comprising a unity gain amplifier having an input connected to receive said signal and an output and further comprising a peak detection and holding circuit (PDH), the input of which is connected to said output of said unity gain amplifier, each PDH comprising a charging and discharging circuit, wherein the second channel charging and discharging circuit has a faster charging and discharging time than the first channel charging and discharging circuit and wherein the second channel PDH attenuates the input signal more than the first channel PDH such that the first channel signal at said comparator is greater in magnitude than said second channel signal at said comparator except when pulses of said pulsing component are present whereby said comparator is responsive to the first and second channel signals for producing an output signal corresponding to the presence of said pulses. - View Dependent Claims (2, 3, 4, 5)
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6. A heart rate monitor comprising a continuous wave microwave transceiver having a transmitting/receiving antenna capable of being directed toward the heart of a patient and, when so directed, for producing a signal having a periodically pulsing component, the period corresponding to the period of successive heart beats and having a reciprocating component corresponding to breathing of said patient, said heart rate monitor further comprising in combination:
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a comparator; and first and second channels coupled to receive said pulsing and reciprocating signal, said first and second channels being coupled to respective inputs of said comparator, each channel comprising a peak detection and holding circuit (PDH) receptive of said pulsing and reciprocating signal and coupled at its output to the comparator, each PDH comprising a charging and discharging circuit, the second channel charging and discharging circuit having a faster charging and discharging time than the first channel charging and discharging circuit, the second channel PDH attenuating the input signal more than the first channel PDH, said comparator being receptive of the two peak detected and held signals for producing a signal having a component corresponding to the time when the pulsing component of the input signal representing heart beat is present. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification