Ultrasonic signal detector
First Claim
1. An ultrasonic detector for monitoring ultrasonic signals having ultrasonic frequencies over a selected range and for producing an audible signal in response thereto, comprising:
- (a) a sensor element operative in response to ultrasonic signals to produce an electrical signal;
(b) amplification and filter circuitry operative in response to the electrical signal to remove all frequency components thereof not within the selected range and to produce an input signal at a selected input frequency and signal amplitude;
(c) an oscillator operative to produce a reference signal at a selected reference frequency;
(d) a mixer operative to receive the input signal and the reference signal to produce a mixed composite signal at a frequency between 0 Hz and 20 kHz at a composite signal amplitude corresponding to the input signal amplitude, said mixed composite signal being spit into first and second components thereof;
(e) a first amplifier operative to amplify the first component of said mixed composite signal to produce an audio signal;
(f) a second amplifier operative to amplify the second component of said mixed composite signal;
(g) a received signal strength indicator circuit operative to monitor said second amplifier to produce a signal strength indicator signal that is linearly correlated to the input signal;
(h) an audio output device for producing an audio sound in response to said audio signal; and
(i) a visual display for producing visible output in response to said signal strength indicator signal whereby said visible output indicates the strength of the second component of said mixed composite signal.
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0 Petitions
Accused Products
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.
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Citations
25 Claims
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1. An ultrasonic detector for monitoring ultrasonic signals having ultrasonic frequencies over a selected range and for producing an audible signal in response thereto, comprising:
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(a) a sensor element operative in response to ultrasonic signals to produce an electrical signal; (b) amplification and filter circuitry operative in response to the electrical signal to remove all frequency components thereof not within the selected range and to produce an input signal at a selected input frequency and signal amplitude; (c) an oscillator operative to produce a reference signal at a selected reference frequency; (d) a mixer operative to receive the input signal and the reference signal to produce a mixed composite signal at a frequency between 0 Hz and 20 kHz at a composite signal amplitude corresponding to the input signal amplitude, said mixed composite signal being spit into first and second components thereof; (e) a first amplifier operative to amplify the first component of said mixed composite signal to produce an audio signal; (f) a second amplifier operative to amplify the second component of said mixed composite signal; (g) a received signal strength indicator circuit operative to monitor said second amplifier to produce a signal strength indicator signal that is linearly correlated to the input signal; (h) an audio output device for producing an audio sound in response to said audio signal; and (i) a visual display for producing visible output in response to said signal strength indicator signal whereby said visible output indicates the strength of the second component of said mixed composite signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 24)
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16. An ultrasonic detector for monitoring ultrasonic signals having ultrasonic frequencies over a selected range and for producing an audible sound corresponding thereto, comprising:
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(a) a sensor element responsive to a received ultrasonic signal to produce an electrical signal; (b) amplification and filter circuitry operative in response to the electrical signal to produce an input signal at an input signal frequency and amplitude; (c) an oscillator operative to produce a reference signal at a reference frequency and amplitude; (d) a Gilbert Cell mixer device to receive the input signal and the reference signal to produce a mixed composite signal at a composite frequency in an audio range and at a composite signal amplitude proportional to the input signal amplitude; (e) a first amplifier operative to amplify the composite signal to produce an audio signal; and (f) an audio output device for producing an audible sound in response to said audio signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 25)
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Specification