JPH0734588B2 - Compressed voice recorder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a compressed audio recording device for use in an electronic still camera or the like, which compresses and records the collected audio data in a storage medium such as a magnetic disk.

[Prior Art] For example, some electronic still cameras can record not only video signals but also audio signals on a magnetic disk.

In a conventional electronic still camera, when a release push button switch is pressed to take a picture, immediately after that, recording is possible for a fixed time.

However, if there is a disturbing sound at the time of shooting, it cannot be recorded, and even if it is recorded, proper recording cannot be performed. Even if there is no interfering sound at the beginning of recording, appropriate recording cannot be performed if the interfering sound is temporarily generated during recording.

Therefore, an audio shutter is provided independently of the release push button switch so that recording can be started at any time.When the audio shutter is pressed, audio data is stored in memory continuously for a predetermined time, for example 15 seconds. By pressing the start push button switch and the end push button switch while playing the sound by pressing the playback push button switch, the start point and the end point of the selected portion within this 15 seconds are designated, and only the necessary portion is recorded on the recording medium, Also, a configuration has been proposed in which the additional voice switch is pressed to additionally store in the memory from the end point (JP-A-61-280004).

[Problems to be Solved by the Invention] However, since it is necessary to temporarily write the collected voice data into the memory before selecting a necessary portion, there is room for selection only in a short time range of about 15 seconds.

If you want to make additional recording, you must store it in the memory for 15 seconds, play it back, press the start push button switch and end push button switch in the middle of playback to select the required portion, and then press the additional voice switch. Therefore, the operation is complicated and the time required for the operation becomes long. Therefore, you may miss the chance of additional recording.

Furthermore, since there is no configuration to stop recording, when you press the switch for additional voice, all of the remaining time is used for memory, and when you try to make additional recording, playback starts from the beginning and the end push button switch is pressed in the middle of playback, Next, a very complicated operation of pressing the switch for additional voice is required.

In view of the above problems, an object of the present invention is to provide a compressed voice recording in which it is possible to easily select a desired portion from an arbitrary time width without missing a recording opportunity, record a voice, and record the voice on a recording medium. To provide a device.

[Means for Solving the Problems] In order to achieve this object, in the present invention, as shown in FIG. 1, after the voice collected by the microphone is A / D converted and once written in the memory, In a compressed audio recording device that compresses and reads the written audio data on the time axis, performs D / A conversion, and writes the compressed audio data to a storage medium, a sound collection switch that inputs a sound collection start command and a sound collection stop command. , A cancel switch for inputting a cancel command,
A sound recording switch for inputting a sound collection command, a sound collection volume display for displaying a sound collection volume, a sound data write address storage unit for storing a sound data write address to the memory, and a sound collection start command, Audio data is written to the memory based on the audio data write address, the audio data write address is updated, and a signal according to the audio data write address is supplied to the sound volume display means to collect sound volume. Is displayed, the sound collection stop command is received, the writing is stopped, the cancel command is received, the voice data in the memory is erased, the voice data write address is set to the initial value, and the recording command is received. And a control unit for writing the compressed audio data to the storage medium after the audio data written in the memory is time-axis compressed and read.

[Embodiment] An embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram of an electronic still camera to which the present invention is applied.

In FIG. 2, reference numeral 10 denotes a system controller, which switches the recording / playback changeover switches 12A and 12B and the video / audio changeover switch 12C in accordance with the setting mode to directly control other constituent elements or a timing control circuit 14. Control through.

16 is a sound collection switch, the system controller 10 receives an odd-numbered operation as a sound collection start command,
The even-numbered operation is received as a sound collection stop command. By this sound collection start command, the audio signal input to the microphone 18 and converted into an electric signal is amplified by the recording amplifier 20, the noise is removed by the recording / playback selector switch 12A, the noise reduction circuit 22, and the filter 24, and the recording is performed. /
It is periodically digitally converted via the reproduction changeover switch 12B and the A / D converter 26 and sequentially written in the audio memory 28. This write address is designated by the value of the audio data write address 30 written in a predetermined address of the RAM which is a component of the system controller 10. The value of the audio data write address 30 is sequentially incremented by a signal from the timing control circuit 14 according to the writing to the audio memory 28. When the system power is turned on, the voice data write address 30 is set to the initial value.

32 is a cancel switch, and when this is operated,
The contents of the voice memory 28 are all cleared (all voice data is erased), and the voice data write address 30 is set to the initial value.

A volume collection indicator 34 displays the volume collection level according to the value of the voice data write address 30. FIG. 3 shows a concrete example of the volume collecting indicator 34.
The display bars are arranged side by side. The display bar is
LED or LCD, etc. The volume collector 34 is provided on the back of an electronic still camera (not shown),
The number of display bars proportional to the volume of sound collected is lit, and the display bars corresponding to the time zone currently being collected are blinking.

A recording switch 36 is operated, and when this is operated, the system controller 10 causes all the audio data written in the audio memory 28 to be written in a predetermined track of the magnetic disk 38. That is, the audio data written in the audio memory 28 is sequentially read, analog-converted by the D / A converter 40, the waveform is smoothed by the low-pass filter 42, and then, in the synthesizing circuit 44, as is known, For each sector of a predetermined track on the magnetic disk 38, a start flag, a control code and an end flag supplied from the system controller 10 are added before and after the compressed audio signal from the low pass filter 42. This addition is standardized. Then, after the high-frequency range is coordinated by the pre-emphasis circuit 46 and then FM-modulated by the audio recording / reproducing circuit 48, a predetermined track of the magnetic disk 38 is transferred via the video / audio switch 12C and the magnetic head 50. FM-modulated voice data is recorded. The magnetic disk 38 is rotated by the spindle motor 52, and the spindle motor 52 servo-controls the rotation of the spindle motor 52 using the pulse (feedback signal, DSP pulse shown in FIG. 5) from the PG coil 56. Further, the magnetic head 50 is moved and tracked by the tracking servo circuit 58 in the radial direction of the magnetic disk 38 based on a control command from the system controller 10.

At the time of reproduction, the audio data read by the magnetic head 50 is supplied to the audio recording / reproducing circuit 48 via the video / audio changeover switch 12C, appropriately amplified and then FM demodulated, and then the de-emphasis circuit 60. , A process having the characteristic opposite to that of the pre-emphasis circuit 46 is performed, and then the high-frequency component is removed by the low-pass filter 62, and then the A / D
Digital data is converted by the converter 64, and the compressed audio data is sequentially written in the audio memory 28. This audio data is read from the audio memory 28 at a speed inversely proportional to the compression rate,
That is, the time axis is expanded, analog-converted by the D / A converter 66, the waveform is smoothed through the recording / playback changeover switch 12B and the filter 24, and the noise reduction circuit 22
Noise is reduced by the recording / playback selector switch 12
A. After being appropriately amplified through the reproduction amplifier 68, it is supplied to the speaker 70 and the reproduced sound is emitted from the speaker 70.

Reference numeral 72 is a video recording / reproducing circuit, which appropriately processes the pixel signal supplied from the image pickup device 74 and outputs an FM-modulated composite video signal. This signal is sent to the magnetic disk 38 via the video / audio switch 12C and the magnetic head 50.
Is recorded on a predetermined track of. Also, the video recording / playback circuit
72 amplifies and FM demodulates the composite video signal read by the magnetic head 50, and outputs it to the terminal 76.

FIG. 4 is a flowchart corresponding to the program written in the ROM of the system controller 10.
This will be described with reference to the timing chart shown in the figure.

When the system power of the electronic still camera is turned on, initialization processing is performed in steps 100 to 106.

That is, in step 100, all the display bars of the volume collection indicator 34 are turned off, the volume N is set to 0, and
Flag F indicating whether or not the collection volume is full at 102
CS0 is set to 0, the flag FCS1 for distinguishing between the sound collection start command and the sound collection stop command is set to 0 in step 104, and the count value of the timer indicating the sound collection volume is cleared in step 106.

Next, at step 108, it waits until the sound collection switch 16, the cancel switch 32, or the recording switch 36 is operated and interrupted.

As shown in FIG. 5, when the sound collection switch 16 is operated, sound collection is started and the sound collection volume is displayed on the sound collection volume display 34.

That is, re-interruption is prohibited in step 110, the process proceeds to step 120 through the determination processing in steps 112 to 118, and the flag FCS1 is set to determine the next command from the sound collection switch 16 as the sound collection stop command. .

Next, the timer is started in step 122, and step 1
At 24, writing to the audio memory 28 is started.

Next, at step 126, the value of the timer t is t> Δt
It is determined whether or not (N + 1).

Here, Δt is, for example, 1/10 of the maximum volume, and is equal to the maximum volume divided by the number of display bars of the volume display 34. The initial value of N is 0 (step 10
0).

Next, at step 128, the volume collecting indicator 34 shown in FIG.
The (N + 1) th display bar from the bottom blinks, and step 13
At 0, the Nth and lower display bars are lit. The other display bars are turned off in step 100. From this blinking display, it is possible to know that the sound is currently being collected. Next, in step 132, the interrupt mask is reset, and re-interruption by the sound collection switch 16, the cancel switch 32, or the recording switch 36 is enabled.

Next, the process returns to step 126, and the above processing is repeated.

When an affirmative decision is made in step 126, the routine proceeds to step 134, where it is decided whether or not t> Tmax.
Here, Tmax is the maximum sound collection volume (see FIG. 3).

If a negative determination is made in step 134, the value of N is incremented in step 136, and step 1
Return to 26. Next, by the processing of steps 128 and 130, the display bar a of the volume collection indicator 34 shown in FIG.
Is blinking.

In this way, in the sound collection volume display 34, the number of display bars proportional to the sound collection volume is sequentially turned on from the lower side, and the display bar corresponding to the current sound collection section is blinked.

If the sound collection switch 16 is operated during sound collection, an interruption occurs and the process proceeds to step 138 through the determination processing of steps 110 to 118, and writing to the audio memory 28 is stopped.

Then in step 140 the timer is stopped and step 1
42 at N + 1th blinking display bar (3rd,
The display bar c) shown in FIG. 5 is turned on. It is possible to know that the sound collection process is temporarily stopped by the disappearance of this blinking. Next, in step 144, the flag FCS1 is reset in order to determine the next command from the sound collection switch 16 as the sound collection start command, the interrupt mask is reset in step 108, and it waits for re-interruption.

When the sound collection switch 16 is operated in this state, an interruption occurs and the processing of steps 110 to 128 is performed, and the lit display bar c blinks again (see FIG. 5).

Recording is completed before the volume reaches the maximum, and the recording switch
If the 36 was operated and interrupted, step 11
The process proceeds to step 158 through the processes of 0 and 112, and if N = 0 is not satisfied, in step 160, all the audio data stored in the audio memory 28 are sequentially time-axis-compressed and the magnetic disk is processed.
Audio data write address recorded in 38 specified tracks
30 is set to the initial value.

Next, returning to the address 100, after initialization processing of steps 100 to 106 is performed, re-interruption is enabled in step 108 and waits for the interruption.

When the cancel switch 32 is operated during or after the sound collection processing, the process proceeds to step 152 through the processing of steps 110 to 114, the timer is stopped, and the contents of the voice memory 28 are cleared in step 154. , The contents of the voice data write address 30 are initialized, and then step 156
At, all display bars of the volume collection indicator 34 are turned off,
Return to step 100.

In the above embodiment, the case where the sound collecting volume indicator is composed of a plurality of display bars has been described, but the present invention is not limited to this, and the sound collecting volume indicator may be configured to display the sound collecting volume by numbers. Good.

Further, although the case where one sound collection switch is configured has been described, the sound collection switch may be configured using a switch that inputs a sound collection start command and another switch that inputs a sound collection stop command.

[Effects of the Invention] In the compressed voice recording device according to the present invention, in response to the voice collection start command from the voice collection switch, the voice data is written to the memory based on the voice data write address, and the voice data is written. The address is updated, and a signal corresponding to the voice data writing address is supplied to the sound collection volume display means to display the sound collection volume. Upon receiving a sound collection stop command from the sound collection switch, the writing is stopped, and the cancel switch. In response to a cancel command from, the voice data in the memory is erased and the voice data write address is set to the initial value,
In response to a recording command from the recording switch, the audio data written in the memory is time-axis compressed and read, and then the compressed audio data is written in the storage medium. There is an excellent effect that it is possible to easily select a necessary portion from an arbitrary time width and connect and record the voice to the recording medium.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. 2 to 5 relate to an embodiment of the present invention. FIG. 2 is a block diagram showing a configuration of an electronic still camera to which the present invention is applied, and FIG. 3 is a volume collection display shown in FIG. FIG. 4 is a diagram showing a specific configuration of the container 34, FIG. 4 is a flow chart showing a processing procedure of the system controller 10, and FIG. 5 is a timing chart used for explaining this flow chart. 18: Microphone, 38: Magnetic disk 44: Composite circuit, 50: Magnetic head 52: Spindle motor, 56: PG coil 70: Speaker 12A, 12B: Recording / playback switch 12C: Video / audio switch a to d: Display bar

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04N 5/781 5/928 7734-5C H04N 5/781 510 H

Claims (3)

[Claims] 1. A / D audio collected by a microphone
In the compressed audio recorder that converts the audio data and writes it to the memory once, then compresses the audio data for time-axis compression, reads it, performs D / A conversion, and writes the compressed audio data to the storage medium. A sound collection switch for inputting a sound stop command, a cancel switch for inputting a cancel command, a recording switch for inputting a recording command, a sound collection volume indicator for displaying the sound collection volume, and an address for writing voice data to the memory are displayed. A voice data write address storage means for storing the voice data, receiving a sound collection start command, writing voice data to the memory based on the voice data write address, and updating the voice data write address. A signal corresponding to the write address is supplied to the sound collection volume display means to display the sound collection volume, and upon receiving a sound collection stop command, the writing is stopped to cancel the sound collection. In response to a recording command, the audio data in the memory is erased, the audio data write address is set to an initial value, and the recording command is received, and the audio data written in the memory is time-axis compressed and read. A compressed voice recording apparatus comprising: a control unit that writes compressed voice data to the storage medium later. 2. The compressed voice recording apparatus according to claim 1, wherein the control means also causes the sound collection volume display means to display whether or not sound is being collected. 3. The sound collection volume display means includes a plurality of display elements, and the control means lights the display element in proportion to the sound collection volume and displays one of the display elements during sound collection. The compressed voice recording device according to claim 2, wherein the fact that the sound is being collected is displayed by blinking.