Communications – electrical: acoustic wave systems and devices – Receiver circuitry
Patent
1994-03-08
1995-07-11
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Receiver circuitry
H04B 106
Patent
active
054327555
ABSTRACT:
An ultrasonic detector for monitoring ultrasonic signals which have a selected ultrasonic frequency range and for producing an audible signal in response to the ultrasonic signals. The ultrasonic detector employs a sensor element which produces electrical signals in response to ultrasonic signals. Amplification and filter circuitry to remove all frequency components not within the selected range to produce a mixer input signal. An oscillator for producing a reference signal at a selected reference frequency. A mixer to receive the output of the filter circuitry and the oscillator to produce a mixed composite signal between 0 and 20 kHz and the composite signal amplitude corresponding to the input signal amplitude. The composite signal is passed through a low pass filter to produce a filtered composite signal. The filtered composite signal has a first component that is then amplified by a first amplifier to produce an audio signal which may be output to a suitable audio device. A second component of the filtered composite signal is amplified by a second amplifier, and a RSSI (Received Signal Strength Indicator) circuit is used to produce a strength indicator signal that may be displayed by a suitable visual display.
REFERENCES:
patent: 3500676 (1968-03-01), Palmer
patent: 3784754 (1974-01-01), Hagiwara et al.
patent: 3978915 (1976-09-01), Harris
patent: 4130734 (1978-12-01), Lee
patent: 4461022 (1984-07-01), Slagley
patent: 5089997 (1992-02-01), Pecukonis
patent: 5103675 (1992-04-01), Komninos
Martin Timothy J.
Pihulic Daniel T.
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