JP2002171482A - Recorder and video camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the sound volume of narration of a photographer independently of an audio signal of a photographing object and select the presence/ absence of recording/reproduction of the narration. SOLUTION: A video camera is provided with a narration microphone that records the narration of the photographer and an audio encoder independently encodes each of total 3 channels of audio data obtained from an L channel recording microphone, an R channel recording microphone and the narration microphone to generate an audio stream.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video camera for recording video and audio, and more particularly to a camera for recording narration of a photographer.

[0002]

2. Description of the Related Art As an example of a technique for clearly recording a narration of a photographer, Japanese Unexamined Patent Publication No. 6-245119 selects a left and right microphone which has a good sound collecting state for a sound emitted by the photographer. An audio signal recording device for deriving and recording an audio signal from a good one is described.

[0003]

However, the above-described audio signal recording apparatus has a problem that once recorded in the narration recording mode, it is not possible to control the presence or absence of narration and the volume of the narration during reproduction. There is also a problem that narration not intended by the photographer and voices of people near the photographer are recorded. Furthermore, since the photographer is close to the sound collecting microphone, there is a possibility that the narration may be recorded at a higher volume than the sound near the photographing target.

In view of the above problems, it is an object of the present invention to provide a recording / reproducing apparatus such as a video camera capable of controlling the volume of a narration of a photographer independently of the sound of the photographing target even when reproducing the narration. . It is another object of the present invention to provide a recording / reproducing apparatus capable of selecting whether to record and reproduce narration.

[0005]

In order to solve the above-mentioned problems, a recording apparatus according to the present invention comprises a first signal input means,
A second signal input unit; and a third signal input unit.
A signal input from the first signal input means is recorded in a first recording area of the recording medium, and a signal input from the second signal input means is recorded in a second recording area of the recording medium. A recording apparatus for recording a signal input from the third signal input means in a third recording area of the recording medium.

A video camera according to the present invention includes an Lch and Rch recording microphone for collecting left and right sounds of a shooting target, respectively, and a narration recording microphone for collecting a photographer's voice. The audio obtained from the microphone for recording, the microphone for recording Rch, and the microphone for recording narration are independently encoded for each channel to generate an audio stream.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings.

First, a first embodiment of the present invention will be described. FIG. 1 is a diagram showing a first video camera of the present invention. As shown in FIG. 1, the video camera includes a recording medium 10, a multiplexer 20, a video encoder 30, an audio encoder 40, a camera 50,
Lc that circulates the left audio of the shooting target and converts it to a digital signal
The microphone includes a recording microphone 60, an Rch recording microphone 70 that collects right-side audio of a shooting target and converts it into a digital signal, and a narration microphone 80.

An image photographed by the camera 50 is converted into a digital signal. The video encoder 30 includes a camera 50
Performs an encoding process on the digital signal obtained from, and generates a video stream. Lch recording microphone 6
0 collects the Lch sound of the shooting target and converts it into a digital signal. The Rch recording microphone 70 collects the Rch sound of the shooting target and converts it into a digital signal. The narration microphone 80 converts the voice emitted by the photographer into a digital signal. The audio encoder 40 is an Lch recording microphone 60
, Rch recording microphone 70 and narration microphone 80
, And independently encodes each channel for each channel to generate an audio stream. The multiplexer 20 receives the encoded streams from the video encoder 30 and the audio encoder 40, and performs audio and video synchronization processing. Then, the generated AV stream is written to a recording medium 10 such as a magnetic tape, a semiconductor memory, or an optical disk.

According to the present invention having the above-described configuration, a clear narration can be obtained by placing a microphone close to the photographer and recording on an independent channel. Also,
Since the Lch recording microphone 60 and the Rch recording microphone 70 do not need to collect sound near the photographer, the directivity to the photographing target can be greatly increased, and the sound near the photographing target can be clearly recorded. . As described above, by recording the narration of the photographer on an independent channel, the narration can be determined.

Next, a second embodiment of the present invention will be described. FIG. 2 is a diagram showing a second video camera of the present invention. In the figure, the same parts as those in FIG. The encode / decode changeover switch 140 is connected to the side of writing to the recording medium 10 during encoding and to the side of reading from the recording medium 10 during decoding to distinguish between encoding processing and decoding processing. The demultiplexer 90 reads the AV stream via the encode / decode changeover switch 140, separates the video stream and the audio stream, and outputs them so that the audio and the video are synchronized. The video decoder 100 reads a video stream from the demultiplexer 90 and performs a decoding process to obtain a video signal. The monitor 130 displays a video signal output from the video decoder 100. The audio decoder 110 reads an audio stream from the demultiplexer 90, performs a decoding process, and outputs a total of three audio signals of Lch, Rch, and narration. The downmix circuit 120 reads the audio signal of 3ch from the audio decoder 110, and downmixes to 2ch using a fixed value or a downmix coefficient set by a user. Lch recording microphone /
The reproduction speaker 61 collects the Lch sound of the shooting target during recording, and outputs the Lch sound during reproduction. The Rch recording microphone / reproducing speaker 71 is used for recording when the recording target Rch
It collects audio and outputs Rch audio during playback.

In the present embodiment, when an AV stream in which narration is recorded on an independent channel is played, 3
By performing the downmix process on the ch, it is possible to adjust the volume of the voice near the shooting target and the voice of the narration.

As the downmix coefficient of the voice near the shooting target and the voice of the narration, a coefficient value prepared in advance may be used, or the user may adjust it during reproduction. Also, if the narration sound is muted during reproduction, the sound near the photographer can be almost cut off, so that even when the surroundings of the photographer are noisy, the sound near the shooting target can be reproduced clearly. Similarly, if the sound near the shooting target is muted during playback, the narration can be clearly reproduced even when shooting a noisy scene. As described above, in the second embodiment, the volume of the narration can be controlled by changing the downmix coefficient during playback.

Next, a third embodiment of the present invention will be described. FIG. 3 is a diagram showing a third video camera of the present invention. In the figure, the same parts as those in FIG. The narration volume adjustment circuit 150 adjusts the volume of the digital signal input from the narration microphone 80 and outputs the digital signal to the audio encoder 40. Volume adjustment circuit 151
After adjusting the volume of the digital signal input from the Lch recording microphone 60 and the Rch recording microphone 70, the digital signal is output to the audio encoder 40.

In the present embodiment, the narration sound and the sound near the shooting target are relatively adjusted in volume before recording, thereby reducing downmixing time during reproduction. The volume value to be adjusted may be a value prepared in advance or a value set by the photographer at the time of recording. Thus, by adjusting the volume at the time of recording, the volume of the narration can be controlled. In addition, sound near the shooting target,
Alternatively, the narration is muted, and the muted channel is not encoded by the audio encoder 40, so that the bit rate of the audio stream can be reduced and the recording time of the video camera can be extended.

Next, a fourth embodiment of the present invention will be described. FIG. 4 is a diagram showing a fourth video camera of the present invention. In this figure, the same parts as those in FIG. Downmix circuit 230
Is the digital signal obtained from the Lch recording microphone 60 and R
The digital signal obtained from the ch recording microphone 70 is down-mixed and a monaural digital signal is output. The selector 240 selects two of a digital signal obtained from the Lch recording microphone 60, a digital signal obtained from the Rch recording microphone 70, a monaural digital signal obtained from the downmix circuit 230, and a digital signal obtained from the narration microphone 80. Select one channel and output.

In the present embodiment, the selector 240
By selecting a channel and performing audio encoding processing, a narration can be clearly recorded even with a conventional audio encoder limited to two channels. By limiting the channels to be encoded to two channels, the bit rate of the generated bit stream can be reduced and the recording time can be extended. As described above, by limiting the number of channels to two, there is an effect that a conventional audio encoder can use the present technology.

Next, a fifth embodiment of the present invention will be described. FIG. 5 is a diagram showing a fifth video camera of the present invention. In this figure, the same parts as those in FIG. Zoom controller 160
Controls the movement of the zoom lens of the camera 50 based on the operation of the photographer.

In the present embodiment, the voice intended by the photographer is recorded by linking the volume adjustment of the narration volume adjustment circuit 150 and the volume adjustment circuit 151 with the control signal of the zoom controller 160. That is, when zooming in, the photographer wants to record around the distant shooting target, and sharpens the directivity of the camera so that the sound near the shooting target is played back at the center. Relatively increase the volume of the sound. Conversely, when zooming out, it is desired to record the sound of the shooting target and the entire vicinity, and by controlling the volume relative to the narration relatively low, it is possible to shoot the video intended by the photographer. .

As described above, by linking the narration with the zoom, there is an effect that the volume of the narration can be adjusted according to the photographed image.

Next, a sixth embodiment of the present invention will be described. FIG. 6 is a view showing a sixth video camera of the present invention. In the figure, the same parts as those in FIG. Narration adjustment circuit 170
Receives a digital signal from a narration microphone and outputs a narration digital signal to an audio encoder when a sound having a certain volume or more is input.

In the present embodiment, the recording is performed only when the photographer speaks at a certain volume in consideration of the recording of the narration, and at other times, the bit rate is reduced by muting to reduce the recording time. To extend. In addition, voices other than narration near the photographer are cut off during recording, so that narration can be reproduced more clearly. As described above, by determining and recording only the narration intended by the photographer, there is an effect of clearly recording the narration.

Next, a seventh embodiment of the present invention will be described. FIG. 7 is a view showing a seventh video camera of the present invention. In the figure, the same parts as those in FIG. The changeover switch 180 switches the audio signal output from the narration microphone 80 according to the selection of the photographer. The voice recognition circuit 190 receives the digital signal of the voice collected by the narration microphone 80 from the changeover switch 180, recognizes the input voice, and outputs a corresponding control signal. System controller 200
Controls the operation of each part of the video camera, and when there is a control signal output from the voice recognition circuit 190, controls the entire system according to the content of the control signal.

In this embodiment, the photographer not only records the narration using the narration microphone 80, but also
It enables the video camera to be controlled by the words spoken. In the conventional video camera operation during shooting by button operation, types of operation contents are limited. However, the control by voice recognition makes it possible to easily perform operations such as fade-in and mosaic effects at the time of screen switching and color tone changes such as color and black and white during shooting. As described above, the provision of the voice recognition circuit has an effect of enabling control of each part of the video camera.

Next, an eighth embodiment of the present invention will be described. FIG. 8 is a diagram showing an eighth video camera of the present invention. In the figure, the same parts as those in FIG. The headphone-type narration microphone 220 is detachable from the video camera body, and is attached to the head of the photographer to convert narration emitted by the photographer into a digital signal. The receiving circuit 210
A narration digital signal output by the headphone-type narration microphone 220 is received and output to an audio encoder.

In the present embodiment, the directivity of the narration microphone can be enhanced by making the narration microphone detachable from the video camera body and recording the narration close to the mouth of the photographer. Also, even if the video camera is taken away from the eyes, the narration microphone is at the mouth of the photographer, so that a clear narration can be recorded. The photographer can listen to the output of the microphone for recording Lch and Rch from the headphones, and can perform a narration while checking the recorded sound. The eighth embodiment has an effect of blocking noises around the photographer by clearly collecting the narration of the photographer using headphones.

[0027]

According to the present invention, the narration by the voice of the photographer is recorded on an independent channel, so that the voice near the photographing target and the narration voice can be clearly recorded.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the present invention.

FIG. 3 is a block diagram showing a third embodiment of the present invention.

FIG. 4 is a block diagram showing a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a fifth embodiment of the present invention.

FIG. 6 is a block diagram showing a sixth embodiment of the present invention.

FIG. 7 is a block diagram showing a seventh embodiment of the present invention.

FIG. 8 is a block diagram showing an eighth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 recording medium 20 multiplexer 30 video encoder 40 audio encoder s 50 camera 60 Lch recording microphone 61 Lch recording microphone / reproduction speaker 70 Rch recording microphone 71 Rch recording microphone / reproduction speaker 80 narration microphone 90 demultiplexer 100 video Decoder 110 Audio decoder 120 Downmix circuit 130 Monitor 140 Encode / decode changeover switch 150 Narration volume adjustment circuit 151 Volume adjustment circuit 160 Zoom controller 170 Narration adjustment circuit 180 Changeover switch 190 Voice recognition circuit 200 System controller 210 Reception circuit 220 Headphone type narration microphone 230 Downmix circuit 240 Selector

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/232 H04N 5/91 C 5/765 G10L 3/00 551G 5/928 H04N 5/91 L 5 / 93 5/92 E H04R 3/00 320 5/93 GF term (reference) 5C022 AB65 AB66 AC31 AC69 AC72 AC74 5C053 GB01 GB11 JA01 JA02 JA05 JA12 KA30 LA01 5D015 KK01 5D020 BB01 BB03 5D044 AB05 AB07 DE14 GK08 GK11

Claims (11)

[Claims] 1. A recording device capable of recording a signal on a recording medium, comprising: a first signal input unit, a second signal input unit, and a third signal input unit; The signal input from the signal input means is recorded in a first recording area of the recording medium, the signal input from the second signal input means is recorded in a second recording area of the recording medium, 3. A recording apparatus for recording a signal input from a third signal input means in a third recording area of the recording medium. 2. A recording device for recording sound on a recording medium, comprising: a first microphone, a second microphone, and a third microphone, wherein the sound collected by the first microphone is provided. Is recorded in a first area of the recording medium, the sound collected by the second microphone is recorded in a second area of the recording medium, and the sound collected by the third microphone is A recording device for recording in a third area of a recording medium. 3. The recording apparatus according to claim 2, further comprising video recording means for recording a video, wherein said first microphone collects sound on the left side of a recording target to be recorded by said recording means, 2. The recording device according to claim 1, wherein the second microphone collects sound on the right side of the recording target, and the third microphone collects sound of a user of the recording device. 4. An Lch recording microphone for collecting Lch sound of a shooting target and converting it to a digital signal, and an R for collecting Rch sound of a shooting target and converting it to a digital signal.
a microphone for recording a ch, a narration microphone that collects a photographer's voice and converts it to a digital signal, and information compression for a digital signal obtained from the microphone for Lch recording, the microphone for Rch recording, and the narration microphone. An audio encoder that generates an audio stream; a camera that converts an image of a shooting target into a digital signal; a video encoder that compresses information on a digital signal obtained from the camera to generate a video stream; And a recording medium for storing an AV stream output from the multiplexer. A video camera, wherein the encoder encodes digital signals obtained from the Lch recording microphone, the Rch recording microphone, and the narration microphone as independent channels. 5. A recording medium storing an AV stream output from the multiplexer, a switch for switching input / output to and from the recording medium so as to write during recording and read the stored AV stream during reproduction. A demultiplexer that outputs a video stream and an audio stream so that audio and video are synchronized with an AV stream read from a medium; a video decoder that decodes a video stream obtained from the demultiplexer and obtains a video signal; A monitor that outputs a video signal obtained from a decoder; an audio decoder that decodes an audio stream obtained from the demultiplexer to obtain audio signals of Lch, Rch, and narration; and a sound signal that is obtained from the audio decoder. And a down-mix circuit to output the box, and change the volume of the recorded narration sound at the time of reproduction, Lc
5. The video camera according to claim 4, wherein the video signal is downmixed to h and Rch and output. 6. A narration volume adjustment circuit for adjusting a volume of a digital signal obtained from the narration microphone, a volume adjustment circuit for adjusting a volume of a digital signal obtained from the Lch recording microphone and the Rch recording microphone. The video camera according to claim 4, further comprising: adjusting a volume of the sound when recording the sound. 7. The video camera according to claim 6, wherein said audio decoder does not encode said channel when any channel is muted by said narration volume adjustment circuit or said volume adjustment circuit. 8. The video camera according to claim 6, wherein said narration volume adjustment circuit and said volume adjustment circuit perform volume adjustment according to a zoom operation of said camera. 9. A narration adjusting circuit which transmits a digital signal only when a digital signal obtained from the narration microphone is equal to or higher than a predetermined volume, wherein a word spoken by a photographer is selected and recorded. The video camera according to claim 4. 10. A voice recognition circuit for performing a voice recognition process on a digital signal obtained from the narration microphone, wherein a video camera can be controlled by a voice uttered by a photographer. Item 6. The video camera according to Item 5. 11. A headphone with a microphone detachable from a main body, and a receiving circuit for receiving an audio signal from the headphone, wherein digital audio obtained from the narration microphone is input from outside the video camera main body. Claim 4
The video camera according to claim 10.