JPH0511650U - Integrated video camera - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an audio signal circuit of a video-integrated camera capable of easily adding an audio signal such as narration. [Structure] In a sound signal circuit of a video-integrated camera, a microphone 1 for converting sound into an electric signal, a recording amplifier 3, a reproduction equalizer amplifier 3, a mixing circuit 7, a mixing circuit output signal 7a, and a reproduction equalizer amplifier output. An audio signal circuit for a video-integrated camera, comprising: a third switch circuit SW3 for switching between the signal 5a and a signal for amplifying and outputting the output signal 7a of the mixing circuit during a mixing operation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a video-integrated camera.

[0002]

[Prior Art]

 FIG. 3 is a diagram for explaining an audio signal mixing system using a conventional video integrated camera, and FIG. 4 is a diagram for explaining an audio signal circuit of a conventional video integrated camera. A conventional technique will be described below with reference to the drawings.

Conventionally, when a magnetic tape to which an audio signal such as narration is added is produced using a video-integrated camera, the audio signal mixing system shown in FIG. 3 has been used.

That is, a reproduction video signal (not shown) and a reproduction audio signal A1 which are obtained by reproducing the captured magnetic tape from the video-integrated camera AA are output, and the former is directly supplied to the stationary video DD (VTR). On the other hand, the latter is supplied to the audio mixer BB. Then, the audio mixer BB obtains the audio mixer output signal B1 by using the mixing volume VR that changes the mixing ratio of the reproduced voice signal A1 and the narration signal C1 supplied from the external microphone C C, and defers this. Supply to video DD. Then, the reproduction video signal and the audio mixer output signal B1 were recorded on the stationary video DD to produce a magnetic tape with narration added.

Now, the audio signal circuit of the video-integrated camera AA will be described in detail with reference to FIG. 4. First, the audio is converted from the microphone 1 (MIC) built in the main body into an electric signal. The obtained microphone output signal is supplied to the automatic level control amplifier 2 (ALC AMP). The automatic level control circuit output signal 2a obtained by amplifying the microphone output signal to an appropriate level by the automatic level control amplifier 2 is the contact S21 in the recording amplifier 3 (REC AMP) and the second switch circuit SW2. Will be supplied to. Then, the recording amplifier 3 supplies the recording amplifier output signal obtained by compensating and amplifying the loss of the high frequency component due to the magnetic recording / reproducing in advance to the contact S11 in the first switch circuit SW1. Here, the first and second switch circuits SW1 and SW2 respectively play a role of switching between recording and reproduction, and the movable pieces S14 and S24 are connected to the contacts S11 and S21 during recording, and the movable piece S14 and S21 during reproduction. S24 is operated so as to be connected to the contacts S12 and S22, respectively.

By the first and second switch circuits SW1 and SW2, at the time of recording, the recording amplifier output signal is transmitted from the contact S11 in the first switch circuit SW1 to the contact S13 via the movable piece S14. Then, it is mixed with the bias signal output from the bias oscillator 4 (BAIS OSC) and recorded on the magnetic tape T using the magnetic head H. Further, the automatic level control circuit output signal 2a is transmitted from the contact S21 in the second switch circuit SW2 to the contact S23 via the movable piece S24, and then amplified to a predetermined output level by the output amplifier 6 (LINE AMP). Is output.

On the other hand, at the time of reproduction, a signal reproduced from the magnetic tape T by using the magnetic head H is transmitted from the contact S13 in the first switch circuit SW1 to the contact S12 via the movable piece S14 to reproduce the equalizer amplifier 5 (PB EQ AMP). Of course, the bias oscillator 4 does not oscillate during reproduction. Then, the reproduction equalizer amplifier 5 corrects the frequency characteristic and the amplified reproduction reproduction equalizer amplifier output signal 5a is transmitted from the contact S22 in the second switch circuit SW2 to the contact S23 via the movable piece S24. After that, it is amplified to a predetermined output level by the output amplifier 6 (LINE AMP) and output to the audio mixer BB in FIG. 3 as the reproduced audio signal A1.

Thus, conventionally, a magnetic tape obtained by adding narration to a magnetic tape taken by a video-integrated camera has been produced.

[0009]

[Problems to be solved by the device]

 However, since such an audio signal mixing system requires the audio mixer BB and the external microphone CC, it is difficult to easily add an audio signal such as narration in a general home.

Therefore, the present invention provides a video-integrated camera that can easily add audio signals such as narration without using the audio mixer BB and the external microphone CC.

[0011]

[Means for Solving the Problems]

 The present invention provides the following configurations in order to solve the above problems.

In a video-integrated camera, a first reproduction audio signal synchronized with a reproduction video signal monitored by a viewfinder during reproduction from a recording medium and a second reproduction audio signal from the outside are selectively mixed. A video-integrated camera, characterized in that it is provided with a mixing circuit, and is capable of mixing the first reproduced audio signal with the second reproduced audio signal.

[0013]

【Example】

 FIG. 1 is a block diagram for explaining an audio signal circuit which is a main part of an embodiment of the present invention, and FIG. 2 is a block for explaining an audio signal circuit which is a main part of another embodiment of the present invention. It is a figure. Embodiments will be described below with reference to the drawings, but the same components as those in FIGS. 3 and 4 are designated by the same reference numerals and the description thereof will be omitted.

An example of the audio signal circuit which is the main part of the video-integrated camera according to the present invention will be described with reference to FIG. 1. The difference from FIG. 4 described above is that a mixing circuit 7 (MIX) is newly added. In addition, the second switch circuit SW2 is changed to the third switch circuit SW3. Therefore, the operation of these new configurations will be explained by understanding it during reproduction and recording.

First, at the time of reproduction, the mixing circuit 7 outputs the automatic level control circuit output signal 2a and the reproduction equalizer amplifier output signal 5a, which are obtained through the microphone 1 and the automatic level control circuit 2 for voice such as narration. The mixing circuit output signal 7a obtained by mixing the two by using the volume 7 which determines the mixing ratio with is supplied to the contact S31 in the third switch circuit SW3. The movable piece S35 in the third switch circuit SW3 is connected to the contact S31 when performing the mixing operation, while it is connected to the contact S33 when performing the normal reproducing operation. The output signal 2a of the automatic level control circuit is transmitted from the contact S31 to the contact S34 via the movable piece S35, and then supplied to the output amplifier circuit 6. In the latter case, the reproduction equalizer amplifier output signal 5a is moved from the contact S33 to the movable piece. After being transmitted to the contact S34 via S35, it is supplied to the post-output amplifier circuit 6.

In this way, the output amplifier output signal 6a obtained by respectively amplifying the mixing circuit output signal 7a and the reproduction equalizer amplifier output signal 5a by the output amplifier 6 according to the respective cases is not shown. Supplied for video etc. When performing a mixing operation, the mixing circuit output signal 7a is monitored by an earphone or the like from an audio signal monitor terminal (not shown), and the playback video signal is monitored by a viewfinder incorporated in the camera-integrated video. -A voice signal such as a voice signal can be added.

Next, at the time of recording, since the movable piece S35 in the third switch circuit SW3 operates so as to be connected to the contact S32, the automatic level control circuit output signal 2a moves from the contact S32 to the movable piece S35. After being transmitted to the contact point S34 via the, it is supplied to the output amplifier circuit 6, amplified here and supplied to a television monitor (not shown) or the like.

Now, another embodiment will be described with reference to FIG. 2. The difference between FIG. 2 and FIG. 4 is that the first and second resistors R1 and R2 and the fourth switch circuit SW4 are different. Is a newly added point. By adding such a new configuration, it is not possible to change the mixing ratio of the automatic level control circuit output signal 2a and the reproduction equalizer amplifier output signal 5a, but with a simple configuration. There is an advantage that the mixing operation is possible. Therefore, the operation of these new configurations will be explained by understanding it during reproduction and during recording.

First, during reproduction, when performing a mixing operation, the contact S41 in the fourth switch circuit SW4 and the movable piece S43 are connected, and the automatic level control circuit output signal 2a moves from the contact S41. After being transmitted to the contact S42 via the piece S43, it is supplied to the connection point RR via the first resistor R1. Further, since the regenerative equalizer amplifier output signal 5a is supplied to the connection point RR via the second resistor R2, the automatic level control circuit output signal 2a and the regenerative equalizer amplifier output signal 5a are the first and the first. The mixed audio signal obtained by mixing according to the ratio of the resistance values of the second resistors R1 and R2 is supplied to the contact S22 in the second switch circuit SW2. On the other hand, when performing a normal reproducing operation, the fourth switch circuit SW4 is opened so that the automatic level control circuit output signal 2a is not supplied to the connection point RR.

In this way, according to each case, the mixing audio signal and the reproduction equalizer amplifier output signal 5a are supplied to the output amplifier 6 via the second switch circuit SW2 and are amplified there. The obtained output amplifier output signal 6a is supplied to a stationary video or the like (not shown).

Next, at the time of recording, the fourth switch circuit SW4 is opened, and the automatic level control circuit output signal 2a is supplied to the output amplifier 6 via the second switch circuit SW2. The output amplifier output signal 6a obtained by being amplified by is supplied to a television monitor (not shown) or the like.

The “mixed” described in the scope of utility model registration claims includes the case of outputting only the first reproduced sound signal and the case of outputting only the second reproduced sound signal. And the case of adding and outputting at the ratio of. Further, it goes without saying that the "second reproduced audio signal" includes, for example, the microphone output signal output from the microphone 1 in the above-described embodiment.

In the above-described embodiment, it goes without saying that the video-integrated camera can magnetically record and reproduce the video signal and the audio signal on the magnetic tape and can confirm the reproduced video signal with the viewfinder. is there.

In the above-described embodiment, the magnetic head H may be a rotary head, but it is of course a good choice.

In the above-described embodiment, the microphone 1 and the video-integrated camera body are connected by a connector, and when performing a mixing operation, a sound supplied from another sound signal source instead of the microphone 1 is used. Of course, signals may be used.

In the above-described embodiment, the audio signal supplied from the microphone output signal or another audio signal source may be a plurality of audio signals such as a stereo audio signal having left and right channels. Of course.

In the embodiment described above, the volume VR in the mixing circuit 7 may of course also be used as the zoom volume used for enlarging / reducing the screen size in the conventional recording.

In the above-described embodiment, the microphone 1 may be a known wireless microphone using FM modulation or the like. In such a case, the video integrated camera body may be provided with a known demodulation circuit. Of course.

Further, the wireless microphone is provided with a volume for varying the mixing ratio of mixing, and the first FM-modulated signal obtained by FM-modulating the signal corresponding to the mixing ratio of mixing obtained from this volume and the audio signal. The second FM modulated signal obtained by FM-modulating the signal is frequency-multiplexed and transmitted, and when received by the video-integrated camera body, the first and second FM-modulated signals are also transmitted using the bandpass filter. Of course, it is also possible to demodulate them by the first and second FM demodulation circuits and supply them to the mixing circuit 7 after separation into the above.

According to the above-described embodiment, since the audio mixer BB and the external microphone CC are unnecessary, it is possible to obtain a mixing voice signal to which voice signals such as narration are added with a simple configuration.

According to the above-described embodiment, the video-integrated camera can confirm the reproduced video signal on the viewfinder and can obtain the mixed audio signal to which the audio signal is added. Therefore, the audio related to the reproduced video signal can be obtained. It is possible to add a signal, and for example, a mixing audio signal to which a shooting date, a place, etc. are added can be obtained.

[0032]

[Effect of the device]

 As described above, according to the present invention, since the video integrated camera is provided with the mixing circuit, the first reproduced sound signal and the second reproduced sound signal from the outside can be mixed without separately providing an audio mixer. There is an effect that can be done.

Further, in the video-integrated camera to which the present invention is applied, since the reproduced video signal can be monitored by the view finder, the second reproduced audio signal related to the reproduced video signal can be mixed. The effect of being able to mix the shooting date, place, etc. with the first reproduced audio signal is provided.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining an audio signal circuit which is a main part of an embodiment of the present invention.

FIG. 2 is a block diagram for explaining an audio signal circuit which is a main part of another embodiment of the present invention.

FIG. 3 is a diagram for explaining an audio signal mixing system using a conventional video-integrated camera.

FIG. 4 is a diagram for explaining an audio signal circuit of a conventional video-integrated camera.

[Explanation of symbols]

 1 Microphone 3 Recording Amplifier 5 Playback Equalizer Amplifier (Playback Amplifier) 7 Mixing Circuit T Magnetic Tape

Claims (1)

Claims for utility model registration 1. In a video-integrated camera, a first reproduction audio signal synchronized with a reproduction video signal monitored by a viewfinder at the time of reproduction from a recording medium and a second reproduction from the outside. A video-integrated camera comprising a mixing circuit for selectively mixing an audio signal, wherein the first reproduced audio signal can be mixed with the second reproduced audio signal.