JPH0244874A - Electronic still camera - Google Patents

Abstract

PURPOSE:To prevent a shutter sound at the time of synchronous recording from being mixed by reading an image by a photographing means by a field unit and a frame unit, and in addition, providing an electronic shutter function. CONSTITUTION:An image pickup element with the electronic shutter function, e.g., a frame interline type image pickup element is used as the image pickup element 14. Then, when a sound recording mode to record synchronously a sound is not selected, photographing is performed in a way similar to a traditional example by using a mechanical shutter 12, and when the sound recording mode is selected, the photographing is performed by using the electronic shutter function of the image pickup element itself. Thus, the mixing of the shutter sound from a microphone 32 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic still camera, and more particularly to an electronic still camera having an audio recording function.

[Conventional technology]

An electronic still camera capable of recording audio is well known, and its configuration is shown in FIG. In FIG. 2, 10 is a photographing lens, 12 is a shutter, 14 is a solid-state image sensor such as a CCD type image sensor, 16 is a drive circuit for the image sensor 14,
18 is a timing signal generation circuit that supplies a timing signal to the drive circuit 16; 20 is an imaging signal processing circuit that converts the output of the image sensor 14 into a still video signal; and 22 is an FM
A modulation circuit, 24 a recording amplifier, 26 a magnetic head, 28
is a magnetic sheet, and 30 is a motor that rotates the magnetic sheet 28. Further, 32 is a microphone, 34 is an audio signal processing circuit, 36 is an A/D converter, 38 is an audio memory, and 40 is a D
/A converter, 42 is an FM modulation circuit, and 44 is a recording amplifier.

In FIG. 2, when the release switch (not shown) of the electronic still camera is pressed, the shutter 12 opens and
Subject light enters the image sensor 14 through the lens 10. The image sensor 14 outputs R, G, and B signals in accordance with drive pulses from the drive circuit 16. Imaging signal processing circuit 20
represents the output of the image sensor 14 as a luminance signal Y and a color difference signal RY,
The FM modulation circuit 22 performs FM modulation. The output of the F modulation circuit 22 is amplified by the recording amplifier 24,
The information is recorded on the magnetic sheet 28 by the magnetic head 26.

At this time, the audio signal input by the microphone 32 is subjected to noise reduction processing in the audio signal processing circuit 34, and
The signal is converted into a digital signal by the D converter 36 and written into the 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 and converted back to an analog signal by the D/A converter 40, and the F
The signal is FM modulated by the M 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 in the trunk following the track on which the video signal was previously recorded, and the track where the audio is recorded has a corresponding link so that the corresponding video can be easily found during playback. Information (for example, track number) identifying the track on which the video signal to be recorded is recorded is recorded.

[Problem to be solved by the invention]

However, in the conventional example described above, since a mechanical shutter is used, there is a drawback that the operating sound of the shutter is mixed into the recording when audio is input. In particular, in continuous shooting, so-called continuous shooting mode, shutter noise is mixed in continuously and over a long period of time.

Also, normally, related audio signals are recorded on the track next to the video signal recording trunk, but when a conventional electronic still camera is operated in continuous shooting mode, the audio signal is recorded during continuous shooting. Store the signal in the audio memory,
After recording each video signal of continuous shooting on the magnetic sheet, the audio data stored in the audio memory is read out and recorded on the magnetic sheet together with information regarding the recording track of the corresponding video signal. As a result, in extreme cases, the video signal may be recorded on all tracks (usually 50 tracks) of the magnetic sheet, leaving no track for recording the audio signal stored in the audio memory. is possible.

When playing back, first, the audio recording track is played back and stored in the audio memory, then the head is moved to the track where the corresponding video signal is recorded, that track is played back, and the video signal is recorded. At the same time, the audio signal stored in the audio memory is played back. However, when playing back magnetic sheets recorded in continuous shooting mode,
The track on which audio is recorded may be separated from the track on which the corresponding video signal is recorded, so in this case, the magnetic head must be moved frequently during playback. .

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an electronic still camera that does not have these drawbacks.

[Means for Solving the Problems] The electronic still camera according to the present invention includes an audio input means, an audio memory means, an audio recording processing means for recording and processing audio signals, and whether or not the audio signals are simultaneously recorded during shooting. An electronic still camera comprising an instruction means for instructing the
The imaging means is characterized in that it can read out field by field and frame by frame, and is equipped with an electronic shutter function.

[Effect]

By using the above elevating means, it is possible to prevent the shatter sound from being mixed into the audio recording.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings.

The embodiment of the present invention is constructed in the same manner as shown in FIG. 2, but as the image sensor 14, an image sensor having an electronic shutter function, for example, a frame interline type image sensor is used. If the audio recording mode in which audio is simultaneously recorded is not selected, the mechanical shutter 12 is used to take pictures in the same way as in the conventional example, and if the audio recording mode is selected, the imaging device itself Take pictures using the electronic shutter function. By doing so, it is possible to prevent shatter noise from entering from the microphone 32.

FIG. 1 shows an operational flowchart of an embodiment of the present invention. When the magnetic sheet is inserted (sl), an empty track is searched outward from the innermost track, and the magnetic head is moved to the beginning of the empty trunk (S2). When not in audio recording mode, wait for shutter release (S4)
, take a picture using the mechanical shutter 12, read the signal from the image sensor (S5), record the video signal on the magnetic sheet (S6), and move the magnetic head one track (S7).
).

In the case of audio recording mode, turn the throat to the magnetic field.
The controller moves to the outer circumferential side of the trunk and secures an empty trunk for recording the audio signal (S8). Then, the accumulated charge of the image sensor is read out in the field (S9).

The reason for this field readout is that in field mode, charge can be accumulated using an electronic shutter, but in frame mode, the readout is shifted by one vertical scanning period (1) for each field, so the mechanical shutter is interlocked. This is because, if not, the charge accumulation time, that is, the shutter speed of each field of the image sensor would be different.

When the shutter is released (S10), an image is taken using 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 (Sll, 12). Then, the video signal is recorded on the magnetic sheet (513), the magnetic head is returned to the previously reserved empty track for audio recording (S14), and the audio signal stored in the audio memory is recorded on the magnetic sheet (S14). S15
).

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

〔Effect of the invention〕

As can be easily understood from the above description, according to the present invention, even when audio is simultaneously recorded, shatter sound is not mixed in.

[Brief explanation of the drawing]

FIG. 1 is an operation flowchart of an embodiment of the present invention, and FIG.
The figure is a configuration block diagram of a conventional example.

Claims (1)

[Claims] An electronic still camera comprising an audio input means, an audio memory means, an audio recording processing means for recording and processing an audio signal, and an instruction means for instructing whether or not to simultaneously record audio signals during shooting.
1. An electronic still camera, characterized in that its imaging means is capable of reading out fields and frames, and is equipped with an electronic shutter function.