Accident sound detector
First Claim
1. An accident sound detector and recorder for detecting and recording accident sounds based on sound signals detected by an ambient sound detector installed near a road, the accident sound detector comprising:
- amplifying means for amplifying sound signals detected by an ambient sound detector installed near a road to produce amplified sound signals,sound-threshold-exceeded detecting and recording means for comparing the amplified sound signals output from said amplifying means with a threshold to detect whether the amplified sound signals exceed the threshold, for outputting the amplified sound signals as sound-threshold-exceeded detection signals when the amplified sound signals exceed the threshold, and for recording the sound-threshold-exceeded detection signals as records,counter means for counting records recorded in a first period of time by said sound-threshold-exceeded detecting and recording means as a record count, andamplification controller means for comparing the record count counted by said counter means within the first period of time with a reference number of records and producing a record-count-exceeded signal when the record count exceeds the reference number, and controlling gain of said amplifying means according to the record-count-exceeded signal.
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Accused Products
Abstract
An accident sound detector counts the number of records of detected accident sounds in a predetermined period of time. The accident sound detector varies the amplification of input sound signals according to the number of records or their variation to limit the number of records, thereby making it possible to increase the recording time of a recording medium without overwriting the records. The detector includes an amplifier for amplifying a sound signal from an ambient sound detector. An accident sound detector circuit and a record controller detect and record an accident sound by comparing an output value from the amplifier to a threshold. A counter circuit counts the number of detected signals of the accident sound detector circuit. A comparator compares the count value of the counter circuit with a reference count value. An amplification controller circuit controls the amplification of the amplifier based on output of the comparator.
22 Citations
5 Claims
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1. An accident sound detector and recorder for detecting and recording accident sounds based on sound signals detected by an ambient sound detector installed near a road, the accident sound detector comprising:
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amplifying means for amplifying sound signals detected by an ambient sound detector installed near a road to produce amplified sound signals, sound-threshold-exceeded detecting and recording means for comparing the amplified sound signals output from said amplifying means with a threshold to detect whether the amplified sound signals exceed the threshold, for outputting the amplified sound signals as sound-threshold-exceeded detection signals when the amplified sound signals exceed the threshold, and for recording the sound-threshold-exceeded detection signals as records, counter means for counting records recorded in a first period of time by said sound-threshold-exceeded detecting and recording means as a record count, and amplification controller means for comparing the record count counted by said counter means within the first period of time with a reference number of records and producing a record-count-exceeded signal when the record count exceeds the reference number, and controlling gain of said amplifying means according to the record-count-exceeded signal. - View Dependent Claims (2, 3, 4, 5)
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Specification