KR930015711A - Microphone signal circuit of video camera - Google Patents
Microphone signal circuit of video camera Download PDFInfo
- Publication number
- KR930015711A KR930015711A KR1019920020895A KR920020895A KR930015711A KR 930015711 A KR930015711 A KR 930015711A KR 1019920020895 A KR1019920020895 A KR 1019920020895A KR 920020895 A KR920020895 A KR 920020895A KR 930015711 A KR930015711 A KR 930015711A
- Authority
- KR
- South Korea
- Prior art keywords
- microphone signal
- low
- pass filter
- circuit
- level
- Prior art date
Links
- 239000003990 capacitor Substances 0.000 claims abstract 12
- 238000000034 method Methods 0.000 claims abstract 2
- 238000001514 detection method Methods 0.000 claims 6
- 230000000903 blocking effect Effects 0.000 claims 2
- 230000005669 field effect Effects 0.000 claims 1
- 230000000593 degrading effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Tests Of Electronic Circuits (AREA)
- Testing Or Measuring Of Semiconductors Or The Like (AREA)
- Circuit For Audible Band Transducer (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
비디오 카메라에 마련된 마이크로폰에서 입력된 신호를 처리하는 회로로서, 음질 저하를 수반하지 않고 마이크로폰의 윈드 커팅 사운드 성분을 제거할 수 있고, 동시에 필터 회로의 커패시터를 저용량화할 수 있도록, 마이크로폰 신호의 저주파 성분의 레벨을 검출하여 하이 패스 필터의 저역 차단 주파수 및 로우 패스 필터의 고역 차단 주파수를 제어하고, 윈드 커팅 사운드가 크게됨에 따라 마이크로폰 신호의 저주파 성분도 크게 되므로, 하이 패스 필터를 저주파 성분 신호의 레벨이 클때, 저역 차단 주파수가 높게 되고, 그 레벨이 낮을때, 저역 차단 주파수가 낮게 되도록 제어하며, 로우 패스 필터는 마이크로폰 신호의 저주파 성분의 레벨이 클때, 고역 차단 주파수가 낮게 되고, 그 레벨이 낮을 때, 고역 차단 주파수가 높게 되도록 제어한다.A circuit for processing a signal input from a microphone provided in a video camera, which can remove the wind-cutting sound component of the microphone without degrading the sound quality and at the same time reduce the capacitor of the filter circuit. By detecting the level, it controls the low cutoff frequency of the high pass filter and the high cutoff frequency of the low pass filter, and as the wind cutting sound gets louder, the low frequency component of the microphone signal becomes larger. When the low cutoff frequency is high and the level is low, the low cutoff frequency is controlled to be low, and the low pass filter is low when the level of the low frequency component of the microphone signal is high, and the high cutoff frequency is low, when the level is low, Control the cutoff frequency to be high.
이러한 비디오 카메라의 마이크로폰 신호 회로를 사용하는 것에 의해, 마이크로폰의 윈드 커팅 사운드 성분이 하이 패스 필터에 의해 제거됨과 동시에 마이크로폰 신호의 고주파 성분이 로우 패스 필터에 의해 양호한 밸런스로 제거되므로, 실용상의 관점에서, 사운드 기록을 좋은 음질로 항상 실행할 수 있고, 하이 패스 필터에 사용될 저항이 부귀환 기술에 의해 큰 비저항으로 되고 그 값이 제어되므로, 필터 회로의 커패시터를 저용량화 및 소형화할 수 있다.By using the microphone signal circuit of such a video camera, since the wind cutting sound component of the microphone is removed by the high pass filter and the high frequency component of the microphone signal is removed by the low pass filter in good balance, from a practical point of view, Sound recording can always be performed with good sound quality, and the resistance to be used for the high pass filter becomes a large specific resistance by the negative feedback technique and its value is controlled, so that the capacitor of the filter circuit can be made smaller and smaller.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.
제1도는 본 발명에 따른 마이크로폰 신호 회로의 기본 원리를 도시한 블럭도, 제2도는 마이크로폰의 윈드 커팅 사운드 스펙트럼의 1예를 도시한 도면, 제3도는 본 발명에 따른 마이크로폰 신호 회로의 하나의 실시예의 회로도.1 is a block diagram showing the basic principle of the microphone signal circuit according to the present invention, FIG. 2 is a diagram showing one example of the wind-cutting sound spectrum of the microphone, and FIG. 3 is one embodiment of the microphone signal circuit according to the present invention. Example schematic.
Claims (11)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3342740A JP2918730B2 (en) | 1991-12-25 | 1991-12-25 | Scan circuit for digital logic |
JP91-342740 | 1991-12-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR930015711A true KR930015711A (en) | 1993-07-24 |
KR970000072B1 KR970000072B1 (en) | 1997-01-04 |
Family
ID=18356130
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019920020895A KR970000072B1 (en) | 1991-12-25 | 1992-11-09 | Microphone signal circuit of video camera |
Country Status (2)
Country | Link |
---|---|
JP (1) | JP2918730B2 (en) |
KR (1) | KR970000072B1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3671948B2 (en) | 2002-09-24 | 2005-07-13 | ソニー株式会社 | Semiconductor integrated circuit and its test method |
US8566658B2 (en) | 2011-03-25 | 2013-10-22 | Lsi Corporation | Low-power and area-efficient scan cell for integrated circuit testing |
US8615693B2 (en) | 2011-08-31 | 2013-12-24 | Lsi Corporation | Scan test circuitry comprising scan cells with multiple scan inputs |
US11444617B2 (en) * | 2016-12-02 | 2022-09-13 | Semiconductor Components Industries, Llc | Set and reset pulse generator circuit |
-
1991
- 1991-12-25 JP JP3342740A patent/JP2918730B2/en not_active Expired - Fee Related
-
1992
- 1992-11-09 KR KR1019920020895A patent/KR970000072B1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
KR970000072B1 (en) | 1997-01-04 |
JPH05172897A (en) | 1993-07-13 |
JP2918730B2 (en) | 1999-07-12 |
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Patent event code: PA01091R01D Comment text: Patent Application Patent event date: 19921109 |
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