JP2759971B2 - Imaging device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an imaging device capable of recording audio.

[Conventional technology]

Electronic still cameras capable of audio recording are known,
The configuration is shown in FIG. In FIG. 2, reference numeral 10 denotes an imaging lens, 12 denotes a shutter, 14 denotes a solid-state imaging device such as a CCD imaging device, 16 denotes a driving circuit of the imaging device 14, and 18 denotes a timing signal generator for supplying a timing signal to the driving circuit 16. Circuit, 20 is an image signal processing circuit that converts the output of the image sensor 14 into a still video signal, 22 is an FM modulation circuit, 24 is a recording amplifier, 26 is a magnetic head, 28 is a magnetic sheet, 30 is a magnetic sheet
This is a motor that rotates 28. 32 is a microphone, 34 is an audio signal processing circuit, 36 is an A / D converter, 38 is an audio memory, 4
0 is a D / A converter, 42 is an FM modulation circuit, and 44 is a recording amplifier.

In FIG. 2, when pressed by a release switch (not shown) of the electronic still camera, the shutter 12 opens,
Subject light enters the image sensor 14 through the lens 10. The image sensor 14 is driven by R, G,
Outputs B signal. The imaging signal processing circuit 20 converts the output of the imaging device 14 into a luminance signal Y and color difference signals RY and BY,
The modulation circuit 22 performs FM modulation. The output of the F modulation circuit 22 is amplified by a recording amplifier 24 and recorded on a magnetic sheet 28 by a magnetic head 26.

At this time, the audio signal input by the microphone 32 is subjected to noise reduction processing by an audio signal processing circuit 34, converted into a digital signal by an A / D converter 36, and written into an audio memory 38. When the recording of the video signal on the magnetic sheet 28 is completed, the data stored in the audio memory 38 is read out, returned to an analog signal by the D / A converter 40, FM-modulated by the FM modulation circuit 42, and applied to the recording amplifier 44. . The output of the recording amplifier 44 is recorded on the magnetic sheet 28 by the magnetic head 26. However,
This audio signal is basically recorded on the track next to the track on which the video signal was previously recorded, and the track on which the audio is recorded has a corresponding video so that the corresponding video can be easily found at the time of reproduction. Information for specifying the track on which the signal is recorded (eg, track number) is recorded.

[Problems to be solved by the invention]

However, in the above-mentioned conventional example, since the mechanical shutter is used, there is a disadvantage that the sound of the shutter operation is mixed and recorded when the sound is input. In particular, in continuous shooting, so-called continuous shooting mode, shutter sound is mixed continuously and for a long time.

Normally, a related audio signal is recorded on a track adjacent to a recording track of a video signal. However, when a conventional electronic still camera is operated in a continuous shooting mode,
During continuous shooting, the audio signal is stored in the audio memory, and after recording each video signal of the continuous shooting on the magnetic sheet, the stored audio data of the audio memory is read out,
The information is recorded on the magnetic sheet together with the information on the recording track of the corresponding video signal. As a result, in extreme cases, video signals are recorded on all tracks (typically 50) of the magnetic sheet, and there are no tracks left for recording the audio signals stored in the audio memory. There can be.

Considering the time of reproduction, first, the audio recording track is reproduced and stored in the audio memory, and then the head is moved to the track where the corresponding video signal is recorded to reproduce the track, and the video signal is reproduced. At the same time as reproducing, the audio signal stored in the audio memory is reproduced. However, when playing back the magnetic sheet recorded and recorded in the continuous shooting mode, the track on which the audio is recorded and the track on which the corresponding video signal is recorded may be separated. In this case, the magnetic head must be moved frequently during reproduction.

Therefore, an object of the present invention is to provide an imaging device that does not have such a defect.

[Means for solving the problem]

An image pickup apparatus according to the present invention is an image pickup apparatus having an audio recording unit for recording an audio signal, and a first recording mode in which an image signal is recorded and an audio signal is not recorded, and an image signal and an audio signal are recorded. Selecting means for selecting a second recording mode; and, when the first recording mode is instructed by the selecting means, imaging of a subject using a mechanical shutter, and selecting the second recording mode by the selecting means. When the instruction is given, there is provided a control means for executing the imaging of the subject without using the mechanical shutter.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The embodiment of the present invention is configured in the same manner as in FIG. 2, but as the image pickup device 14, an image pickup device having an electronic shutter function, for example, a frame interline type image pickup device is used. When the audio recording mode for simultaneously recording audio is not selected, shooting is performed using the mechanical shutter 12 in the same manner as in the conventional example, and when the audio recording mode is selected, the image sensor itself is moved. Shoot using the electronic shutter function. In this way, the shutter sound
32 can be prevented from being mixed.

FIG. 1 shows an operation flowchart of one embodiment of the present invention. When the magnetic sheet is inserted (S1), an empty track is searched outward from the innermost track, and the magnetic head is moved to the beginning of the empty track (S2). When not in the audio recording mode, the camera waits for a shutter release (S4), performs photographing using the mechanical shutter 12, reads a signal from the image sensor (S5), and records a video signal on a magnetic sheet (S5).
6) The magnetic head is moved by one track (S7).

In the case of the audio recording mode (S3), the magnetic head is moved to the outer periphery of one track to secure an empty track for recording an audio signal (S8). Then, the electric charges stored in the imaging element are read out in the field (S9). The reason for this field reading is that although the electric charge can be stored using the electronic shutter in the field mode, the reading is shifted by one vertical scanning period (1 V) for each field in the frame mode, so that the mechanical shutter is not linked. In this case, the charge accumulation time of each field of the image sensor, that is, the shutter timing is different.

When the shutter is released (S10), photographing is performed by the electronic shutter, and at the same time, the audio signal input from the microphone is converted into a digital signal and temporarily stored in the audio memory (S11, 12). Then, the video signal is recorded on the magnetic sheet (S13), the magnetic head is returned to the previously secured empty track for audio recording (S14), and stored in the audio memory, and the audio signal is recorded on the magnetic sheet. (S15).

In this way, by securing an empty track for audio recording in advance, the recording track of the video signal and the recording track of the corresponding audio signal can be adjacent to each other. Further, the problem that there is no empty track in which an audio signal can be recorded after recording a video signal is also solved.

〔The invention's effect〕

As can be easily understood from the above description, according to the present invention, even when audio is recorded simultaneously, shutter noise does not mix.

[Brief description of the drawings]

FIG. 1 is an operation flowchart of one embodiment of the present invention, and FIG.
The figure is a configuration block diagram of a conventional example. 10… shooting lens, 12… shutter, 14… image sensor,
16 ... Drive circuit, 26 ... Magnetic head, 28 ... Magnetic sheet, 30 ... Motor, 32 ... Microphone

Continuation of front page (58) Fields investigated (Int.Cl. ⁶ , DB name) H04N 5/781 H04N 5/335

Claims (2)

(57) [Claims] 1. An image pickup apparatus having audio recording means for recording an audio signal, comprising: a first recording mode for recording an image signal and not recording an audio signal; and a second recording mode for recording an image signal and an audio signal. Selecting means for selecting a recording mode, and when the first recording mode is instructed by the selecting means, executes imaging of a subject using a mechanical shutter,
A control unit configured to execute imaging of a subject without using a mechanical shutter when the second recording mode is instructed by the selection unit. 2. The apparatus according to claim 1, wherein said control means is configured to execute recording of a field image signal when said second recording mode is instructed by said selection means. An imaging device according to any one of the preceding claims.