US4633234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sonic detector having digital sampling circuit
Assignee: AUDIO SENTRY Manufacturing Inc
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Filing: 1985-11-22
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Granted: 1986-12-30
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Expires: 2005-11-22
Abstract
Abstract A sonic detector for security applications or the like includes a digital sampling circuit which converts sound waves into digital pulses and stores the pulses in a counter that is periodically reset by a timing circuit. If a predetermined number of pulses are accumulated in the counter before the counter is reset, an alarm signal is generated to energize an alarm. The duration of the pulses may be altered to compensate for the effects of reflected sound which vary depending on the ambient acoustical environment. The number of pulses required to generate an alarm signal may be preprogrammed in accordance with the type of sounds to be detected. An anti-defeat circuit converts a continuous sound wave to the required number of digital pulses for generating an alarm.
Inventors
- 👤 David G. Gagnon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:05
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/16; G08B13/1654; G08B13/1672
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
48 words
An intrusion detection alarm device, comprising: a microphone; means for converting the output of said microphone into a plurality of electrical pulses; means for discretely counting said pulses; and means for producing an alarm when a prescribed number of said pulses have been counted by said counting means.
Claim 2
Dependent Claim
48 words
An intrusion detection alarm device, comprising: a microphone; means for converting the output of said microphone into a plurality of electrical pulses; means for discretely counting said pulses; and means for producing an alarm when a prescribed number of said pulses have been counted by said counting means.
Claim 3
Dependent Claim
41 words
The intrusion detector of claim 1, wherein said converting means includes means for sensing the amplitude of the output of the microphone and for converting to said electrical pulses only those parts of the output having amplitudes exceeding a prescribed value.
Claim 4
Dependent Claim
40 words
The intrusion detector of claim 1, wherein said converting means includes: a pulse generator having an output for delivering an output pulse, and said means for counting includes a counter for receiving and counting output pulses from said pulse generator.
Claim 5
Dependent Claim
55 words
The alarm device of claim 1, wherein said producing means includes: means for producing an alarm signal, an alarm switch responsive to said alarm signal, and means for preventing delivery of said alarm signal to said switch if said prescribed number of pulses are not counted by said counting means within a preselected time period.
Claim 6
Dependent Claim
40 words
The alarm device of claim 4, wherein said counting means includes a reset input for resetting the count of said counting means and said preventing means includes a timer and means for delivering a reset signal to said reset input.
Claim 7
Dependent Claim
27 words
The alarm device of claim 1, including means for selectively altering the duration of said electrical pulses in accordance with the acoustical characteristics of the ambient environment.
Claim 8
Dependent Claim
73 words
An intrusion detection system comprising: a microphone for converting sound waves into electrical signals; a first pulse generator for producing electrical pulses in response to said electrical signals; a counter for discretely counting said electrical pulses; a second pulse generator for producing an alarm pulse; and programmable means responsive to said counter for enabling said second pulse generator to produce said alarm pulse when the count in said counter reaches a prescribed value.
Claim 9
Dependent Claim
73 words
An intrusion detection system comprising: a microphone for converting sound waves into electrical signals; a first pulse generator for producing electrical pulses in response to said electrical signals; a counter for discretely counting said electrical pulses; a second pulse generator for producing an alarm pulse; and programmable means responsive to said counter for enabling said second pulse generator to produce said alarm pulse when the count in said counter reaches a prescribed value.
Claim 10
Dependent Claim
27 words
The apparatus of claim 7, including means for resetting the counter after a prescribed time interval that commences with a pulse produced by said first pulse generator.
Claim 11
Dependent Claim
16 words
The apparatus of claim 7, including means for visually displaying each count counted by said counter.
Claim 12
Dependent Claim
35 words
The apparatus of claim 7, wherein said counter includes a reset input and said second pulse generator includes an output connected with said reset input for resetting said counter after an alarm pulse is generated.
Claim 13
Dependent Claim
115 words
A circuit for detecting an intrusion comprising: a microphone operative to generate an alternating signal; means for converting the alterations in said signal into a plurality of electrical pulses; means for discretely counting said pulses; and means for producing an alarm when a prescribed number of said pulses have been counted by said counting means, said producing means including (1) means for producing an alarm signal, (2) an alarm switch responsive to said alarm signal, and (3) means for preventing delivery of said alarm signal to said switch if said prescribed number of pulses are not counted by said counting means within a preselected time interval commencing with a pulse produced by said conversion means.
Claim 14
Dependent Claim
115 words
A circuit for detecting an intrusion comprising: a microphone operative to generate an alternating signal; means for converting the alterations in said signal into a plurality of electrical pulses; means for discretely counting said pulses; and means for producing an alarm when a prescribed number of said pulses have been counted by said counting means, said producing means including (1) means for producing an alarm signal, (2) an alarm switch responsive to said alarm signal, and (3) means for preventing delivery of said alarm signal to said switch if said prescribed number of pulses are not counted by said counting means within a preselected time interval commencing with a pulse produced by said conversion means.
Claim 15
Dependent Claim
40 words
The alarm device of claim 11, wherein said counting means includes a reset input for resetting the count of said counting means and said preventing means includes a timer and means for delivering a reset signal to said reset input.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |