Recording device and video device using the same

• US 5,337,367 A
• Filed: 11/24/1992
• Issued: 08/09/1994
• Est. Priority Date: 11/26/1991
• Status: Expired due to Term

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: Maeda, Hiroyuki
• Primary Examiner(s): Isen, Forester W.
• Application Number:
  US07/981,063
• Time in Patent Office: 623 Days
• Field of Search: 381/92, 381/94, 381/95, 381/122
• US Class Current: 381/94.7
• CPC Class Codes: G01D 3/0365 the undesired influence being measured using a separate sensor, which produces an influence related signal
• CPC Class Codes: G11B 31/00 Arrangements for the associated working of recording or reproducing apparatus with related apparatus with cameras or projectors G03B31/00 ; recording/reproducing of music for electrophonic musical instruments G10H1/0033; automatic arrangements for answering calls or for recording messages for absent subscribers H04M1/64; telephonic communication systems adapted for combination with dictation recording and playback systems H04M11/10; connection of TV recorder with other related apparatus, e.g. TV camera or receiver, in which the TV signal is significantly involved H04N, e.g. H04N23/00, H04N5/765; combination of radio or TV with other apparatus, e.g. with vehicles H05K11/00
• CPC Class Codes: G11B 31/006 with video camera or receiver
• CPC Class Codes: H04N 5/772 the recording apparatus and the television camera being placed in the same enclosure
• CPC Class Codes: H04N 5/9202 the additional signal being a sound signal H04N5/9155, H04N5/92 take precedence

Abstract

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.

Claims

1. A recording device which selectively reduces wind sound components in a sound signal picked up by a microphone and records the same, comprising;

a wind pressure sensor either formed 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 components;

a selection circuit which sends out the sound signal collected by the microphone to said recording circuit via said filter circuit in response to a control signal and, when no control signal is received, sends out the sound signal to said recording circuit while bypassing said filter circuit;

a control circuit which generates the control signal when a signal from said wind pressure sensor exceeds a predetermined level;

an AGC circuit including an AGC amplifier disposed in front of said recording circuit and wherein said filter circuit is disposed in front of said AGC circuit; and

said control circuit setting a lower limit value of gain for said AGC amplifier in response to the wind pressure so as not to reduce the lower limit of the gain below a predetermined value.

2. A recording device according to claim 1, wherein said filter circuit includes a plurality of low range cutoff frequencies and said control circuit selects one of the plurality of low range cutoff frequencies in response to a signal level from said wind pressure sensor.

3. A recording device according to claim 1, wherein said control circuit generates the control signal to include a first and a second state;

said selection circuit sends out the sound signal to said recording circuit, while bypassing said filter circuit, when receiving the control signal in the first state; and

when receiving the control signal in the second state, said selection circuit sends out the sound signal collected by the microphone to said recording circuit via said filter circuit.

4. A recording device according to claim 3, wherein said filter circuit includes a plurality of filters having a low range cutoff frequency, said control circuit generates the second state to include a plurality of states, and said control circuit selects one of the plurality of filters dependent upon one of the plurality of states corresponding to a wind pressure value represented by a signal from said wind pressure sensor.

5. A recording device according to claim 4, wherein, when the wind pressure value represented by the signal from said wind pressure sensor is higher than a first predetermined value and is equal to or less than a second predetermined value the filter having a first cutoff frequency of which frequency is low among the plurality of low range cutoff frequencies is selected, and when the wind pressure value represented by a signal from said wind pressure sensor is higher than the second predetermined value, the filter having a second cutoff frequency which is higher than the first cutoff frequency is selected.

6. A video device including a recording device according to claim 1, further including a video camera integrated with said recording device.

7. A recording device which selectively reduces wind sound components in a sound signal picked up by a microphone and records the same, comprising;

a wind pressure sensor either formed 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 components;

a selection circuit which sends out the sound signal collected by the microphone to said recording circuit via said filter circuit in response to a control signal and, when no control signal is received, sends out the sound signal to said recording circuit while bypassing said filter circuit;

a control circuit which generates the control signal when a signal from said wind pressure sensor exceeds a predetermined level; and

said wind pressure sensor including a wind pressure plate which slants in response to a wind pressure from a vertical state and generates a signal in response to a slanted angle.

8. A recording device including a recording device according to claim 7, further including a video camera integrated with said recording device.

9. A recording device according to claim 7, wherein said filter circuit includes a plurality of low range cutoff frequencies and said control circuit selects one of the plurality of low range cutoff frequencies in response to a signal level from said wind pressure sensor.

10. A recording device according to claim 7, wherein said control circuit generates the control signal to include a first and a second state;

said selection circuit sends out the sound signal to said recording circuit, while bypassing said filter circuit, when receiving the control signal in the first state; and

when receiving the control signal in the second state, said selection circuit sends out the sound signal collected by the microphone to said recording circuit via said filter circuit.

11. A recording device according to claim 10, wherein said filter circuit includes a plurality of filters having a low range cutoff frequency, said control circuit generates the second state to include a plurality of states, and said control circuit selects one of the plurality of filters dependent upon one of the plurality of states corresponding to a wind pressure value represented by a signal from said wind pressure sensor.

12. A recording device according to claim 11, wherein, when the wind pressure value represented by the signal from said wind pressure sensor is higher than a first predetermined value and is equal to or less than a second predetermined value the filter having a first cutoff frequency of which frequency is low among the plurality of low range cutoff frequencies is selected, and when the wind pressure value represented by a signal from said wind pressure sensor is higher than the second predetermined value the filter having a second cutoff frequency which is higher than the first cutoff frequency is selected.