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| Distortion-cancellation circuit for audio peak limiting |
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| Level control circuit for low and medium sound |
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| Stereoscopic video display system |
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| Endoscope automatic light control apparatus and endoscope apparatus making use of the same |
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Recording device and video device using the same
| Details |
Inventors: Maeda, Hiroyuki;
Assignee: Rohm Co., Ltd. (Kyoto, JP)
Primary Examiner: Isen; Forester W.
Assistant Examiner:
Attorney, Agent or Firm: Fay, Sharpe, Beall, Fagan, Minnich & McKee
A recording device comprising, a wind pressure sensor either foraged integral with the microphone or disposed at the vicinity of the microphone and detecting the wind pressure acting thereon; a recording circuit; a filter circuit which cuts off low sound components corresponding to the wind sound; a selection circuit which sends out the sound signal collected by the microphone to the recording circuit via the filter circuit in response to a control signal and, when no control signal is received, sends out the sound signal to the recording circuit while bypassing the filter circuit; and a control circuit which generates the control signal when the signal from the wind pressure sensor exceeds a predetermined level. |
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DETAILED DESCRIPTION An object of the present invention is to realize a recording device which is designed to record sounds without caring wind pressures.
Another object of the present invention is to realize a recording device which is designed to cut off automatically wind sound components in response to the wind pressure while eliminating a change-over switch for cutting off wind sound components.
A further object of the present invention is to realize a video device which is designed to cut off automatically wind components in response to the wind pressure while eliminating a change-over switch for cutting off wind sound components.
A still further object of the present invention is to realize a video device which is designed to record sounds clearly in both outdoors and indoors.
The constitution of the recording device according to the present invention, which automatically detects a wind pressure and automatically performs the wind sound reduction processing, comprises a wind pressure sensor either formed integral with a MIC or disposed at the vicinity of the MIC and detecting the wind pressure acting thereon, a recording circuit, a filter circuit which cuts off low sound components corresponding to the wind sound, a selection circuit which sends out a sound signal collected by the MIC to the recording circuit via the filter circuit in response to a control signal and, when no control signal is received, sends out the sound signal to the recording circuit while bypassing the filter circuit and a control circuit which generates the control signal when the signal from the wind pressure sensor exceeds a predetermined level.
Further, a modified constitution of the above further comprises an AGC circuit, and the control circuit generates a band selection signal as the control signal and further generates a set signal which sets a lower gain limit of the AGC circuit, and the filter circuit includes a filter having a plurality of cutoff frequencies and is disposed in front of the AGC circuit
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