KR100203273B1 - Zoom mike for camcorder - Google Patents
Zoom mike for camcorder Download PDFInfo
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- KR100203273B1 KR100203273B1 KR1019960042116A KR19960042116A KR100203273B1 KR 100203273 B1 KR100203273 B1 KR 100203273B1 KR 1019960042116 A KR1019960042116 A KR 1019960042116A KR 19960042116 A KR19960042116 A KR 19960042116A KR 100203273 B1 KR100203273 B1 KR 100203273B1
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- acoustic signals
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- zoom
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- 230000009977 dual effect Effects 0.000 claims abstract description 8
- 230000005236 sound signal Effects 0.000 claims description 12
- 238000000605 extraction Methods 0.000 claims description 2
- 238000001454 recorded image Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 210000001565 alc Anatomy 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B31/00—Associated working of cameras or projectors with sound-recording or sound-reproducing means
- G03B31/02—Associated working of cameras or projectors with sound-recording or sound-reproducing means in which sound track is on a moving-picture film
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- 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
- H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- General Physics & Mathematics (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
- Studio Devices (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
개시된 내용은 캠코더에서 카메라 줌잉기능 수행시 촬영되는 피사체 중심의 음향신호만을 강조하여 기록할 수 있도록 한 캠코더의 줌 마이크장치에 관한 것이다. 본 발명의 장치는 소정거리내의 음향신호를 입력받기 위한 이중마이크와, 피사체와의 거리에 따라 이중 마이크를 통해 입력된 두 음향신호를 증폭기에서 서로 다른 크기로 증폭하여 이를 자동레벨조절기에 의해 두 음향신호의 근거리부분이 동일한 레벨을 갖도록 조절한다. 이에, 자동레벨조절기로부터 두 음향신호를 입력받아, 입력되는 제어신호에 의해 하나의 음향신호를 위상반전한다. 따라서, 동일한 레벨을 갖는 근거리부분의 음향신호는 덧셈기에서 제거되며, 피사체 중심의 원거리부분의 음향신호만을 추출/기록한다. 따라서, 기록되는 영상에 매칭되는 음향신호의 줌기능을 기록할 수 있는 효과를 제공한다.The present invention relates to a zoom microphone device of a camcorder capable of emphasizing and recording only an acoustic signal in the center of a subject to be photographed when a camcorder performs zooming of a camera. The apparatus includes a dual microphone for receiving an acoustic signal within a predetermined distance, and an amplifier for amplifying the two acoustic signals inputted through the dual microphone according to the distance between the object and the object, The near portion of the signal is adjusted to have the same level. Thus, two acoustic signals are received from the automatic level controller, and the phase of one acoustic signal is reversed by an input control signal. Therefore, the acoustic signal of the near portion having the same level is removed from the adder, and only the acoustic signal of the far portion of the object center is extracted / recorded. Therefore, it is possible to record the zoom function of the acoustic signal matched to the recorded image.
Description
본 발명의 목적은 캠코더에서 이중 마이크(Double Microphone)를 통해 입력된 음향신호를, 피사체 중심의 주변 음향신호를 강조하여 기록하므로써 음향의 줌효과를 나타낼 수 있도록 캠코더의 줌 마이크장치를 제공함에 있다.An object of the present invention is to provide a zoom microphone device of a camcorder so that a sound signal input through a double microphone in a camcorder can be emphasized and recorded in the vicinity of a center of a subject to thereby exhibit a zoom effect of sound.
본 발명은 영상과 음향을 동시에 줌잉(Zoomming)하는 기록재생장치에 관한 것으로서, 특히 캠코더에서 음향의 줌효과를 극대화하기 위하여 이중 마이크를 통해 입력된 음향신호를 피사체 중심으로 기록한다. 즉, 피사체 중심의 주변 음향신호를 강조하여 기록할 수 있도록 한 캠코더의 줌 마이크장치에 관한 것이다.The present invention relates to a recording and reproducing apparatus for simultaneously zooming an image and sound, and in particular, a sound signal inputted through a dual microphone is recorded at the center of a subject to maximize the zoom effect of the sound in the camcorder. That is, the present invention relates to a zoom microphone device of a camcorder capable of emphasizing and recording a peripheral acoustic signal at the center of a subject.
일반적으로 캠코더(Camcorder)와 같은 영상과 음향을 동시에 기록 및 재생할 수 있는 기록재생장치에서는, 초점거리를 자유롭게 바꿀 수 있는 줌렌즈(Zoom Lens)를 채용하여 영상을 연속적으로 확대 또는 축소시킨 후 기록한다. 이에 반하여 음향은 영상 줌잉상태에 상관없이 촬영자 중심의 주변 음향신호만 크게 기록되어 재생시 영상에 매칭되는 음향은 제대로 들리지 않고 잡음만 들리게 된다. 최근에는 지향성마이크셀을 사용하여 그 길이를 가변시켜 마이크의 지향성을 조절하므로써 영상과 마찬가지로 음향도 줌잉을 수행할 수 있도록 한다.2. Description of the Related Art In general, a recording and reproducing apparatus capable of simultaneously recording and reproducing images and sounds such as a camcorder employs a zoom lens which can freely change a focal distance, and continuously enlarges or reduces an image to record. On the other hand, only the ambient sound signal of the center of the photographer is recorded regardless of the image zooming state of the sound, so that the sound that matches the image at the time of reproduction is not heard properly, and only the noise is heard. In recent years, the directional microphone cell is used to vary the length of the microphone, thereby adjusting the directivity of the microphone, so that the sound can be zoomed in the same manner as the image.
하지만, 위의 종래 지향성 마이크장치는 줌효과가 마이크의 지향성에 의해서만 좌우되는 문제가 있었다. 그래서, 이중 마이크를 사용하여 입력되는 음향신호중 근거리의 음향신호는 억제하고, 원거리의 음향신호를 크게하므로써 음향 줌잉을 수행할 수 있는 캠코더의 줌 마이크장치를 제시한다.However, in the conventional directional microphone device, there is a problem that the zoom effect depends only on the directivity of the microphone. Thus, a zoom microphone device of a camcorder capable of performing acoustic zooming by suppressing a near-acoustic signal of an acoustic signal input by using a dual microphone and enlarging a sound signal of a long distance is presented.
도 1은 본 발명에 따른 캠코더의 줌 마이크장치를 나타내는 구성도,1 is a configuration diagram showing a zoom microphone device of a camcorder according to the present invention;
도 2는 도 1장치의 동작을 설명하기 위한 파형도,Fig. 2 is a waveform diagram for explaining the operation of the apparatus of Fig. 1,
※도면의 주요 부분에 대한 부호의 설명[Description of Drawings]
11,12 : 마이크 13,14,20 : 증폭기11, 12: Microphones 13, 14, 20: Amplifier
15,16 : 자동레벨조절기(ALC) 17 : 스위칭부15, 16: automatic level controller (ALC) 17:
18 : 위상반전기 19 : 덧셈기18: Phase Reversal 19: Adder
따라서, 본 발명에 따른 캠코더의 줌 마이크장치는, 소정거리내의 음향신호를 입력받기 위한 적어도 둘 이상의 마이크와, 상기 이중마이크를 통해 입력되는 두 음향신호를 서로 다른 크기로 증폭하는 증폭기와, 상기 증폭기에서 증폭된 두 음향신호의 근거리부분이 동일한 레벨을 갖도록 레벨 조절하는 자동 레벨조절기, 및 상기 자동레벨조절기로부터 인가되는 두 음향신호에서 동일한 레벨을 갖는 근거리부분은 제거하고, 피사체 중심의 원거리부분의 음향신호만을 추출하여 기록하는 음향추출/기록부를 포함한다.Therefore, the zoom microphone device of the camcorder according to the present invention includes at least two microphones for receiving acoustic signals within a predetermined distance, an amplifier for amplifying two acoustic signals inputted through the dual microphones at different magnitudes, An automatic level controller for adjusting the level of the near portion of the two acoustic signals amplified in the first level to have the same level and a second level controller for removing the near level portion having the same level in the two acoustic signals applied from the automatic level controller, And an acoustic extraction / recording unit for extracting and recording only the signal.
이하에서, 첨부한 도면들을 참조하여, 본 발명의 바람직한 실시예를 상세히 기술하기로 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 1은 본 발명에 따른 캠코더의 줌 마이크장치를 나타내는 구성도이다. 도시된 바와 같이, 본 발명의 장치는 이중 마이크(11,12)와, 마이크(11,12)를 통해 입력되는 음향신호를 서로 다른 크기로 증폭하기 위한 복수개의 증폭기(13,14,), 및 증폭된 음향신호를 자동으로 레벨 조정하여 새추레이션(Saturation) 발생을 방지하는 자동레벨조절기(Automatic Level Control; ALC)(15,16)를 구비하고 있다. 또한, ALC(15,16) 각각에는 미도시된 제어수단을 통해 입력되는 제어신호(CTL)에 따라 스위칭해 동작하는 복수개의 스위치(SW1,SW2)로 된 스위칭부(17)가 연결된다. 스위칭부(17)에는 제 1스위치(SW1)를 통해 입력되어 음향신호를 위상반전하는 위상반전기(18)와, 위상반전된 음향신호와 제 2스위치(SW2)를 통해 입력되는 음향신호를 합하여 근거리 음향신호는 제거하고 원거리 음향신호만을 추출하는 덧셈기(19)가 연결된다. 덧셈기(19)에는 추출한 원거리 음향신호를 강조하기 위해 일정 크기로 증폭하는 증폭기(20)가 연결되도록 구성된다.1 is a configuration diagram showing a zoom microphone device of a camcorder according to the present invention. As shown in the figure, the apparatus of the present invention includes dual microphones 11 and 12, a plurality of amplifiers 13 and 14 for amplifying acoustic signals inputted through the microphones 11 and 12 to different magnitudes, And automatic level control (ALC) 15 and 16 for automatically adjusting the level of the amplified sound signal to prevent the occurrence of saturation. Each of the ALCs 15 and 16 is connected to a switching unit 17 composed of a plurality of switches SW1 and SW2 which are operated by switching according to a control signal CTL input through control means not shown. The switching unit 17 is provided with a phase inverter 18 for inputting a sound signal through the first switch SW1 and inverting the phase of the sound signal and an acoustic signal inputted through the second switch SW2 An adder 19 is connected which removes the near acoustic signal and extracts only the far acoustic signal. The adder 19 is connected to an amplifier 20 for amplifying the extracted far-field sound signal to a predetermined magnitude.
이와 같이 구성된 본 발명에 따른 캠코더의 줌 마이크장치에 대한 동작을 도 1 및 도 2를 참조하여 좀더 구체적으로 설명한다.The operation of the zoom microphone device of the camcorder according to the present invention constructed as above will be described in more detail with reference to FIGS. 1 and 2. FIG.
도 2는 도 1장치의 동작을 설명하기 위한 파형도이며, 도 1 및 도 2에 도시된 바와 같이 이중마이크(11,12)를 통해 입력되는 두 음향신호의 신호파형(S1)을 서로 다른 크기로 증폭하는 증폭기(13,14)를 통해 증폭된 두 음향신호를 근거리음향은 동일한 레벨을 갖고, 원거리 음향은 두 배정도 차이가 나게 자동레벨조절기(15,16)에서 레벨 조절에 적합한 신호파형(S2,S3)을 추출한다. 스위칭부(17)는 두 음향신호를 입력받아, 미도시된 제어수단의 제어신호(CTL)에 따라 하나의 음향신호를 위상반전기(18)로 출력한다. 즉, 피사체와의 거리가 근거리인 경우 스위칭부(17)에서는, 제 1스위치(SW1)의 절환접속자(C)가 제 1접점(A)에 절환접점되고, 제 2스위치(SW2)의 절환접속자(G)는 제 2접점(F)에 절환접속된다. 또한, 본 발명에 의한 원거리에있는 피사체에 대한 음향기록시, 제 1스위치(SW1)의 절환접속자(C)가 제 2접점(B)에 절환접점되고, 제 2스위치(SW2)의 절환접속자(G)가 제 2접점(E)에 절환접속한다.FIG. 2 is a waveform diagram for explaining the operation of the apparatus of FIG. 1, in which the signal waveforms S1 of the two acoustic signals input through the dual microphones 11 and 12 are different from each other The amplitudes of the two sound signals amplified by the amplifiers 13 and 14 are equal to each other, and the distances between the two sound amplitudes are equal to each other. , S3). The switching unit 17 receives the two acoustic signals and outputs one acoustic signal to the phase inverter 18 according to the control signal CTL of the control unit (not shown). That is, when the distance to the subject is short, the switching connector 17 of the first switch SW1 is switched to the first contact A and the switch connector 17 of the second switch SW2 (G) is switched and connected to the second contact (F). The switching connector C of the first switch SW1 is a switching contact to the second contact B and the switching connector C of the second switch SW2 is connected to the second contact B when sound is recorded on a subject at a long distance according to the present invention. G switchably connect to the second contact point E.
이에, 위상반전된 신호파형(S4)은 스위칭부(17)에서 출력되는 두 음향신호중 다른 하나의 음향신호와 덧셈기(19)에서 아날로그적으로 합성되어 추출된다. 즉, 근거리음향은 상쇄되고 피사체 중심의 원거리음향만을 추출한다. 추출된 원거리음향의 신호파형(S5)은 뒷단에 연결된 증폭기(20)에 의해 상쇄량만큼 보상하기 위해 일정크기로 증폭출력한다. 이에, 출력된 신호의파형(S6)을 기록매체에 기록한다.Thus, the phase-inverted signal waveform S4 is synthesized analogously by the adder 19 and the other one of the two acoustic signals output from the switching unit 17 and extracted. That is, the near-ear sound is canceled and only the far-center sound of the subject is extracted. The extracted signal waveform S5 of the far-end sound is amplified by a predetermined amount to compensate for the offset amount by the amplifier 20 connected to the rear end. Thus, the waveform S6 of the output signal is recorded on the recording medium.
상술한 바와 같이, 본 발명은 캠코더의 줌 마이크장치에 관한 것으로 줌 마이크장치를 구현하는데 있어 줌정도에 따라 피사체중심의 음향신호기록과 이를 영상에 매칭시켜 효과적으로 기록할 수 있다. 또한, 가정용 캠코더로 한정된 것이아닌, 방송용카메라 마이크장치로도 사용할 수 있는 효과를 갖는다.As described above, the present invention relates to a zoom microphone device of a camcorder, and in implementing a zoom microphone device, it is possible to record an acoustic signal at the center of a subject according to zoom magnification, Furthermore, the present invention can be used not only as a home camcorder but also as a camera microphone for broadcasting.
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