JPS6238585A - Electronic still camera - Google Patents

Abstract

PURPOSE:To monitor recorded sound by providing a recording/reproducing changeover switch which connects a head to designated one of a sound recording circuit and a sound reproducing circuit and a monitor switch which sends a control signal to the recording/reproducing changeover switch to reproduce sound. CONSTITUTION:If the control signal from a pulse generator 34 falls when the write of sound signals to a sound storage memory 27 is terminated approximately, the control signal from a monostable multivibrator 35 is sent to a synchronization control circuit 29, a polarity switching circuit 36, and a recording/ reproducing changeover switch 21. A head driving signal which moves heads 11 and 22 for an extent corresponding to two tracks is sent from the synchronization control circuit 29 to a head drive circuit 31, and the polarity switching circuit 36 switches a motor 37 from the reverse rotation state to the forward rotation state, and the motor 37 moves heads 11 and 22 forward for the extent corresponding to two tracks. When the recording/reproducing changeover switch 21 receives a trigger signal, the state is switched from sound reproducing side to the recording side, and the storage state is confirmed by a speaker 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The electronic still camera of the present invention will be explained according to the following items.

A. Industrial field of application B0 Overview of the invention C0 Prior art 0 Problems to be solved by the invention E1 Means for solving the problems F9 Effects G. Examples [Figures 1 to 3] a. Appearance [Figures 1 and 2] b0 circuit configuration [Figure 3] C8 circuit operation H1 Effects of the invention (A, industrial application field) The present invention is a novel electronic still camera, particularly an electronic still camera having a recording function. It is related to still cameras.

(B. Summary of the Invention) The present invention provides an electronic still camera having a recording function equipped with an audio recording circuit, in which an audio reproducing circuit and a head are connected to the audio recording circuit and the audio recording circuit so that the recorded audio can be played back. A recording/playback selector switch that is connected to the playback circuit designated by the switch control signal, and a monitor switch that sets the sound to be played back by the switch control signal that is sent to the record/playback selector switch. According to such an electronic still camera, when the monitor switch is operated, the head is connected to the audio playback circuit via the recording/playback selector switch, and the audio playback state is set in which the audio is played back by the audio playback circuit. The audio recorded by the audio recording circuit can be monitored.

(C, prior art) Instead of capturing images on silver halide photosensitive film as a camera,
2. Description of the Related Art Electronic still cameras have been developed that photoelectrically convert images using a solid-state imaging device such as a COD (charge-coupled device) and further magnetically record the converted images on a magnetic disk. Techniques were also developed to add a recording function to this electronic still camera;
It has been published in Publication No. 4. According to such an electronic still camera with a recording function, it is possible to record messages, explanations, etc. from the photographer or the photographed person along with the video.

(D. Problems to be Solved by the Invention) By the way, conventional electronic still cameras with a recording function were not provided with an audio monitoring function. As a result, it is not possible to check whether the audio has been recorded properly, and for example, even if you went to a recreational area and took a photo with an explanation about the subject, the explanation may be cut off, or the explanation may be cut off. After returning home, you may realize that the end of the video was cut off, or that the explanation was difficult to hear due to too much noise, and you may not be able to retake the photo.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to enable monitoring of the recorded sound after recording video and sound in an electronic still camera with a recording function.

(E. Means for Solving the Problems) In order to solve the above problems, the electronic still camera of the present invention has an audio playback circuit and a head that are specified by a switch control signal among the audio recording circuit and the audio playback circuit. The apparatus is characterized in that it is provided with a recording/playback changeover switch connected to the recording/playback changeover switch, and a monitor switch which sets the state for audio playback by sending the switch control signal to the recording/playback changeover switch.

(F. Effect) Therefore, according to the electronic still camera of the present invention, by operating the monitor switch, the head is connected to the audio playback circuit via the recording and playback switch, and the recorded sound is played back by the audio playback circuit. It is possible to realize an audio playback state that is similar to the above. Therefore, it is possible to monitor the sound recorded by the sound recording circuit immediately after photographing.

(G. Embodiment) [FIGS. 1 to 3] The electronic still camera of the present invention will be described in detail below according to the embodiment shown in the accompanying drawings.

1 to 3 show an example of the implementation of the electronic still camera of the present invention.

(a, external appearance) [Figures 1 and 2] Figures 1 and 2 show the external appearance of an electronic still camera. In the drawings, 2 is the camera body, and 3 is the front center of the camera body 2. 4 is a microphone installed in one corner of the front of the camera body 2,
5 is an optical viewfinder, 6 is a shutter button provided on the top of the camera body 2, and 7 is a camera body 2
A speaker 8 is provided on the back of the camera body 2, and 8 is a monitor switch provided on the back of the camera body 2.

(b. Circuit Configuration) [FIG. 3] FIG. 3 is a circuit block diagram showing the circuit configuration of the internal circuit of the electronic still camera 1.

Reference numeral 9 denotes a solid-state image sensor that captures an image of light incident through the lens 3 and converts it into an electrical signal. The video signal recording circuit 10 appropriately processes the signal output from the image sensor 9 so that it can be recorded.The output of the video signal recording circuit 10 is sent to the recording head 11, and is magnetically The information is magnetically recorded on the disk 12.

13 is an amplifier that amplifies the sound collected by the microphone 4 and converted into an electrical signal; 14 is an encoder having a noise reduction function that reduces noise from the signal output from the amplifier 13; and 15 is the signal output from the encoder 14. Converting analog audio signals to digital signals A
16 is an audio storage memory that stores the audio signal converted into a digital signal, 17 is a D/A converter that converts the audio signal read from the audio storage memory 16 into an analog signal, and 18 is a high frequency converter. 19 is an FM modulator for FM modulating the audio signal; 20 is an amplifier for amplifying the signal FM modulated by the FM modulator 19; It is connected to the head 22, and when in the recording mode, the audio signal output from the amplifier 20 is recorded on the magnetic disk 12 by the audio head 22.

23 is an FM demodulator which receives an audio signal from the audio head 22 via the recording/playback switch 21 and demodulates the audio signal. Specifically, the input terminal of the FM demodulator 23 is connected to one switching terminal of the recording/playback changeover switch 21, the common terminal of the recording/playback changeover switch z1 is connected to the audio head 22, and the input terminal of the recording/playback changeover switch z1 is connected to the audio head 22. 2
The other switching terminal of L is connected to the output terminal of the amplifier 20. 24 is a low-pass filter; 25 is a de-emphasis circuit that performs de-emphasis processing to restore the emphasized high frequency range; 26 is an A/D converter that converts an analog audio signal into a digital signal; 27 is the A/D An audio storage memory 28 stores audio signals converted into digital signals by the converter 26; 28 is an audio storage memory 27;
D/ which converts the audio signal output from the
The audio signal converted into an analog signal by the D/A converter 28 is reproduced by the speaker 7.

29 is a synchronous control circuit (system controller) which receives signals from the shutter button 6 and the switch control circuit 30 and sends the shutter signal to the video signal recording circuit 10, the A/D converter 15, the audio storage memory 16, or the A/D converter 15, the audio storage memory 16, or the A/D converter 15; Sends a write control signal to the D converter 26 and the audio storage memory 27, and sends a read control signal to the audio storage memory 16 and the D/A converter 17 or the audio storage memory 27 and the D/A converter 28.・Head drive circuit 31 - A motor that sends a head drive signal to move the head 11.22 in the tracking direction (direction that intersects the track), and sends a disk rotation control signal to the motor control circuit 32 to rotate the disk 12. 3
Rotate 3.

The switch control circuit 30 includes a pulse generator 34 that generates one pulse when the monitor switch 8 is turned on (in other words, when an audio reproduction command signal is generated from the monitor switch 8), and a pulse generator 34 that generates one pulse. A monostable multivibrator 35 generates one pulse having a predetermined pulse width in synchronization with the falling edge of . The switch control circuit 30 synchronizes the output signal of the pulse generator 34 (used as a trigger signal) and the output signal of the monostable multivibrator 35 (used as a retrigger signal) with the synchronous control circuit 29, the recording/playback switch 21, and the output signal of the monostable multivibrator 35 (used as a retrigger signal). The signal is sent to a polarity switching circuit 36, which will be described later.

The head drive circuit 31 appropriately amplifies the head drive signal from the synchronization control circuit 29 and sends it to the head drive motor 37 via the polarity switching circuit 36 . Polarity switching circuit 3
6 receives a signal from the switch control circuit 30 as a polarity switching signal, and switches the polarity of the head drive signal applied to the motor 37 according to the designation of the switching signal. The motor 37 is a DC motor that rotates in response to a head drive signal, and rotates forward or reverse depending on the polarity of the head drive signal. 38
is a recording head control mechanism (although it is shown as an electronic circuit in FIG. 3, it is actually a mechanism) that converts the rotation of the motor 37 into a linear movement to move the heads 11 and 22 in the tracking direction. ).

(c, circuit operation) Next, circuit operation will be explained.

(A) When the shutter button 6 is pressed, it is turned on, and recording and recording operations are performed.

Therefore, first, the recording operation will be explained.

The audio signal collected by the microphone 4 is amplified by the amplifier 13, the nozzle is removed by the encoder 14 having a nozzle reduction function, and then converted to a digital signal by the A/D converter 15, and then sent to the A/D converter 16. be remembered. The write control signal used for this write control has a frequency of, for example, 5 KHz, and is transmitted from the synchronous control circuit 29 to the A/D converter 15 and the audio storage memory 16.

When the audio signal of the audio for a predetermined period of time (for example, 10 seconds) is stored in the audio storage memory 16, reading is started. The readout control signal used to control the readout has a frequency of, for example, 3.
MHz, and the audio signal is read out from the audio storage memory 16 to the D/A converter 17 under the control of this signal. The audio signal is converted into the original analog signal by the D/A converter 17, and the pre-emphasis circuit 1
The high frequency range is emphasized by 8, frequency modulated by FMq modulator 19, and amplified by amplifier 20. Then, the output signal of the amplifier 20 is transferred to the recording/playback switch 21 which is switched to the recording side (amplifier 20 side) (this circuit is kept switched to the recording side except when the monitor switch 8 is pressed). ) to the audio head 22.
transmitted to. Then, the audio signal is magnetically recorded on the magnetic disk 12 by the head 22 . On the other hand, the voice storage memory 16 is connected from the synchronous control circuit 29 to the motor control circuit 32.
The motor 33 is rotated by sending out a disk rotation control signal during a period (1/60 second) during which audio signals are being read from the D/A converter 17 . As a result, the audio signal for 10 seconds stored on the magnetic disk 12 is magnetically recorded on one track with the time axis compressed to 1/600.

As described above, recording is also being performed while recording is being performed. In this recording operation, a video signal of one shot taken by the photographing element 9 is appropriately modulated by the video signal recording circuit 10, amplified, and magnetically recorded on the magnetic disk 12 by the recording disk 11. Two magnetic disks 11.22
Magnetic recording of video signals and audio signals onto the 7a disk 12 is simultaneously performed on two separate annular tracks adjacent to each other.

When the magnetic recording is completed, a head drive signal is sent from the synchronous control circuit 29 to move the heads 11 and 22 by two tracks to the head drive circuit 31, and this head drive signal is amplified by the head drive circuit 31, and the polarity is changed. The voltage is applied to the motor 37 via the switching circuit 36 and the motor 37
rotates (forward rotation) and enters the standby state for the next recording. As a result, Rad 11.22 is the head control mechanism 38
This moves the track forward by two tracks (proceeds from the track with the lower number to the track with the higher number), and enters a standby state for the next recording. Note that in a normal state, the polarity switching circuit 36 is in a switching state that causes the motor to rotate in the normal direction.

(E) After performing the magnetic recording described above, when the Yanitor switch 8 is pressed to turn on (in other words, when an audio playback command signal is generated from the monitor switch 8), the electronic still camera 1 plays back the recorded audio. Next, this audio reproduction operation will be explained.

When the monitor switch 8 is pressed and turned on, it becomes a trigger and a one-pulse control signal is generated from the pulse generator 34, and this control signal is sent to the synchronous control circuit 2.
9, it is sent as a trigger signal to the polarity switching circuit 36 and the recording/playback switching switch 21. Then, synchronous control circuit 2
9 sends a head drive signal to the head drive circuit 31 to move the rads 11 and 22 by two tracks, and the polarity switching circuit 36 enters a switching state that causes the motor 37 to rotate in the reverse direction. As a result, the motor 37 moves the head 11 for two tracks.
．． A head drive signal for moving the heads 11 and 22 is received with opposite polarity, and the heads 11 and 22 are moved backward by two tracks. In other words, the video from the top of the unrecorded Torad 11.22,
This will return you to the track where the audio was recorded. In addition, during this time, the recording/playback selector switch 21 is switched to the pulse generator 34.
The audio reproduction side (FM demodulator 23 side) by the control signal from
In other words, the state is switched to the audio playback state. Then, the synchronous control circuit 29 sends a disk rotation control signal to the motor control circuit 32 to rotate the motor 33. Then, the magnetic disk 12 rotates once in 1/60th of a second.

The head 2 reads the audio signal recorded on the track while the magnetic disk 12 rotates once.
The audio signal read out by step 2 is transferred to FM via the recording/playback switch 21 which is switched to the audio playback side.
The signal is transmitted to the demodulator 23 and subjected to FM demodulation. The audio signal is passed through a low-pass filter 24 and a de-emphasis circuit 25.
The signal is input to the A/D converter 26 through the A/D converter 26 and converted into a digital signal. The audio signal converted into a digital signal is then written into the audio storage memory 27. A write control signal (3 MHz) for this write is sent from the synchronous control circuit 29.

When the writing of the audio signal to the audio storage memory 27 is completed,
The control signal generated from the pulse generator 34 falls. Then, in synchronization with the falling edge of the signal, a control signal is sent from the monostable multi-by-break 35 as a retrigger signal to the synchronization control circuit 29, the polarity switching circuit 36, and the recording/playback changeover switch 21. Then, a head drive signal is sent from the synchronization control circuit 29 to move the head 11.22 by two tracks to the head drive circuit 31, and the polarity switching circuit 36 returns from the switching state of rotating the motor 37 in the reverse direction to the switching state of rotating the motor 37 in the forward direction.

As a result, motor 37 advances head 11.22 by two tracks. Further, when the recording/playback changeover switch 21 receives a retrigger signal, it switches from the state of being switched to the audio playback side to the state of being switched to the recording side.

Further, upon receiving the retrigger signal, the synchronization control circuit 29 sends out the readout control signal (5 KHz) to the audio storage memory 27 and the D/A converter 28. As a result, the audio signal for 10 seconds stored in the audio storage memory 27 is
is read out to the A converter 28, and the D/A converter 2
8 converts the audio signal into an analog signal, and the audio signal converted into the analog signal is reproduced as audio (10 seconds) by the speaker 7.

By reproducing the audio through the speaker 7, it is possible to check whether the audio is properly stored on the magnetic disk 12.

In the above embodiment, the recording/playback changeover switch 21 receives a trigger signal from the switch control circuit 30 and switches from the recording side to the audio playback side, and then, while being switched to the audio playback side, the recording/playback changeover switch 21 switches from the recording/playback changeover switch 30 to the audio playback side. When a retrigger signal is received, the audio playback side returns to the recording side. However, when it receives a trigger signal from the switch control circuit 30, it switches to the audio playback side, but when about 1/60th of a second has passed after receiving the trigger signal, it automatically switches to the audio playback side (that is, without depending on the re-trigger signal). It may be possible to switch from the recording side to the recording side.

(H. Effects of the Invention) As is clear from the above, the electronic still camera of the present invention has a recording function that is equipped with an audio recording circuit that records audio via a head on a recording medium that records still images. In an electronic still camera having a Q@ function, which is equipped with an audio recording circuit that records audio via a head on a recording medium for recording still images, the audio recorded on the R medium is played back. a monitor switch that generates an audio playback command signal when an audio playback operation is performed; and a switch control that generates a switch control signal that causes an audio playback state when receiving the audio playback command signal from the monitor switch. circuit and said switch control signal to connect said head to said audio reproduction circuit if it is a switch control signal that causes an audio reproduction condition, otherwise to connect said head to said audio recording circuit. The device is characterized by having a recording/playback changeover switch.

Therefore, according to the electronic still camera of the present invention, by operating the monitor switch, the head is connected to the audio playback circuit via the recording/playback changeover switch, and an audio playback state is realized in which the sound is played back by the audio playback circuit. It is possible to monitor the audio recorded by the audio recording circuit.

[Brief explanation of drawings]

1 to 3 show an example of the implementation of the electronic still camera of the present invention, and FIG. 1 is a perspective view of the electronic still camera;
FIG. 2 is a perspective view of the electronic still camera seen from a different angle from FIG. 1, and FIG. 3 is a circuit block diagram showing the circuit configuration. Explanation of symbols 1...Electronic still camera, 4.13-20...Audio recording circuit, 7.23-28-Red Φ audio playback circuit, 8-Kai...Monitor switch, 21--Fist recording playback switch , 22・-sha head, 30...Switch control circuit Fig. 2

Claims (1)

[Claims] (1) In an electronic still camera having a recording function that is equipped with an audio recording circuit that records audio via a head on a recording medium that records still images, an audio reproducing circuit that reproduces the audio recorded on the recording medium; a monitor switch that generates an audio playback command signal when an audio playback operation is performed; a switch control circuit that generates a switch control signal that causes an audio playback state when receiving the audio playback command signal from the monitor switch; a recording/playback selector switch controlled by a signal that connects the head to the audio playback circuit when the signal is a switch control signal that causes an audio playback state, and otherwise connects the head to the audio recording circuit; An electronic still camera characterized by having