JP2008123615A - Information recording / reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording and reproducing device which makes seek operation noise or drive operation noise such as change noise of speed of rotations of a spindle motor, inconspicuous as much as possible. <P>SOLUTION: The device has a detecting means detecting an audio signal level from a microphone 15. When it is detected during photographing that the audio signal level is a preset level or above, an image and audio data of a buffer memory 26 are recorded in an optical disk 9. When data of a preset second threshold value or above are stored in the buffer memory 26, the image and audio data of the buffer memory 26 are recorded in the optical disk 9. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an information recording / reproducing apparatus for recording or reproducing image and audio data on an information recording medium such as an optical disk.

  2. Description of the Related Art Conventionally, there is a camera-integrated disc recording / reproducing apparatus in which an image input unit or an audio input unit having an image pickup element and an information recording / reproducing apparatus for recording / reproducing an image, audio information, etc. on a disc recording medium are integrated.

  A general operation sequence when using a disk recording / reproducing apparatus incorporating a disk recording medium will be described. Usually, simultaneously with the operation of the recording start button, the spindle motor is activated to rotate the disk, the head is moved to the recording start position, and then recording of actual image and audio data is started. Since it takes several seconds until then, there is a possibility of missing recorded images and sounds that are important to keep.

  Therefore, Patent Document 1 discloses a method of starting image and sound recording from the moment when recording is started, temporarily storing it in a storage means, and recording the stored recording data on a disk after preparation for recording is completed. ing. Further, Patent Document 2 discloses a method in which all data being shot is stored in a storage unit such as a buffer memory, and recorded from the buffer memory to a disk after shooting is completed.

Further, in the conventional information recording / reproducing apparatus, when the temperature in the apparatus changes by a predetermined temperature or more, there is a method in which the learning operation is performed by moving the head to the test area of the disk. The learning operation is for determining an optimum recording condition such as the recording laser power, and when the ambient temperature of the disc has a temperature change equal to or higher than a predetermined temperature, the parameter is changed to perform recording or reproduction.
Japanese Patent Laid-Open No. 11-4410 JP 2001-357599 A

  In Patent Document 1, there is a problem that noise is generated by recording a spindle starting sound for starting up the apparatus or a sound of a seek operation for moving the optical head to a target address position. In particular, since the test area for performing the learning operation as described above is on the inner circumference side of the disk, the sound of the seek operation that moves the optical head to the inner circumference side during the learning operation and the rotation change sound of the spindle are generated. Recorded and made noise.

  Therefore, Patent Document 2 describes that the servo operation is not executed while the audio information is being input. However, intermittent recording of the data stored in the buffer memory during recording of the moving image and the audio on the disk is performed. It does not assume operation. Further, as the amount of data increases, the capacity of the buffer memory increases.

  An object of the present invention is to provide an information recording / reproducing apparatus capable of making a drive operation sound such as a seek operation sound or a rotation speed change sound of a spindle motor as inconspicuous as possible by a simple method.

  The present invention has a detecting means for detecting a sound signal level from the sound input means, and when the sound signal level is detected by the detecting means at a predetermined level or more during shooting, the image and sound data in the buffer memory are detected. Is recorded on the information recording medium. When data exceeding a preset threshold value is accumulated in the buffer memory, the image and audio data in the buffer memory are recorded on the information recording medium.

  According to the present invention, since the recording operation to the optical disk is executed when the sound input during shooting is large, the seek operation sound for moving the optical head to the target position and the rotation speed change until the spindle motor reaches the target rotation speed. Drive operation sound such as sound can be kept as inconspicuous as possible. Further, since the learning process is executed when the voice input during shooting is large, the drive operation sound can be made as inconspicuous as possible.

  Next, the best mode for carrying out the invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of an information recording / reproducing apparatus according to the present invention. In the figure, reference numeral 11 denotes a camera unit having an optical component such as a lens as an imaging system, and reference numeral 12 denotes a CCD imager as an imaging device.

  The image light formed on the imaging surface of the CCD imager 12 is converted into an electrical imaging signal by the CCD imager 12, and the imaging signal obtained by the CCD imager 12 is sent to the gain control A / D converter 13. The gain control A / D converter 13 performs processing such as gain adjustment and digital conversion, and the obtained image data is supplied to the signal processing means 14.

  Reference numeral 15 denotes a microphone for inputting sound. The audio signal from the microphone 15 is supplied to the A / D converter 17 via the microphone amplifier 16 and supplied to the signal processing means 14 as digital audio data.

  The signal processing circuit 14 performs encoding / decoding processing, modulation / demodulation, ECC addition, or conversion into a recording format for recording on the optical disc 9 as an information recording medium in order to convert image data and audio data into recording data. Reference numeral 26 denotes a buffer memory for temporarily storing recording data, and 28 denotes recording / reproducing means for recording the recording data on the optical disk 9 (reproduction will be described later).

  Reference numeral 27 denotes an optical head for recording or reproducing an image, sound or the like on the optical disk 9. The optical head 27 includes a light emitting element (semiconductor laser) 24 that outputs a light beam with a predetermined power and a light receiving element (photodiode) 25 that detects reflected light from the optical disk 9. In addition, the actuator includes a half mirror, a collimator lens, an objective lens, and an actuator 23 that controls focusing and tracking of the light beam by driving the objective lens in a direction perpendicular to the disk surface and in a radial direction.

  A signal from the recording / reproducing means 28 is recorded on the optical disk 9 by driving the semiconductor laser 24 of the optical head 27. The servo control means 18 performs servo control necessary for optical recording, for example, focus and tracking control by control of the actuator 23 of the optical head 27, and rotation control of the optical disk 9 for controlling the spindle motor 19. Further, a rack for positioning the optical head 27 at the address position in the radial direction on the optical disc 9, seek control by the pinion 21 and the seek motor 22, and the like are performed.

  The focus and tracking control is performed based on the detection of a focus error signal and a tracking error signal indicating the positional deviation of the focus and tracking of the optical head 27. In the seek control, a position on the optical disk 9 is detected by an address signal or the like on the optical disk 9, and control is performed according to the detected position. These controls and management are performed by a control microcomputer which is the system control means 20.

  Next, when the recorded information on the optical disk 9 is reproduced, the information written on the optical disk 9 is read by the optical head 27 as a difference in the amount of reflected light from the disk surface. A signal from the optical head 27 is supplied to the signal processing means 14 via the recording / reproducing means 28 and converted into original image data or the like. This data is displayed on an image display means (not shown) such as an LCD. These controls and management are also performed by the system control means 20.

  The optical disk 9 has a test area used for determining the servo conditions and recording conditions of the apparatus in order from the inner circumference side, a management information area for managing user data recorded on the optical disk on the outer circumference side, and a user on the outer circumference side. A data recording area is arranged. User data and management information are created by the signal processing means 14, converted into a recording signal by the recording / reproducing means 28, and recorded on the optical disk 9. Recording position management is performed by the system control means 20, and system control for determining servo conditions and recording conditions is also performed by the system control means 20.

  Next, the configuration of the microphone amplifier 16 and the A / D converter 17 will be described. In general, in an information recording / reproducing apparatus having an audio input means, in order to record an input audio at a predetermined audio signal level, the gain of an amplifier provided at the preceding stage of the recording stage is set at the time of audio recording. A circuit that automatically adjusts according to the level is provided.

  As such a circuit, for example, there is a digital detection type automatic level adjustment circuit (hereinafter referred to as an ALC circuit) using a programmable gain amplifier (hereinafter referred to as PGA) as shown in FIG. In the present embodiment, the ALC circuit in FIG. 2 is a circuit in which the microphone amplifier 16 and the A / D converter 17 in FIG. 1 are combined.

  In the ALC circuit of FIG. 2, the input audio signal amplified by the PGA 10 is first A / D converted by the A / D converter 17 at the subsequent stage of the PGA 10. Next, the level detection unit 8 detects the level of this digital signal (the signal level of the output of the PGA 10), and the gain control unit 7 compares this detection level with a predetermined reference level.

  Based on the comparison result, a control signal is output from the gain control unit 7 to the PGA 10, and the gain of the PGA 10 is adjusted so that the output audio signal from the PGA 10 has a predetermined audio signal level according to the control signal.

  Specifically, when the level of the digital signal detected by the level detection unit 8 is higher than a predetermined reference level, an operation (attack operation) is performed in which the amplifier gain of the PGA 10 is lowered step by step. When the digital output signal level is lower than the predetermined reference level, an operation (recovery operation) for raising the PGA 10 step by step is performed.

  By continuously adjusting the gain by the attack operation and the recovery operation until the digital signal level reaches a predetermined reference level, the gain of the amplifier can be recorded at the input audio signal level. Therefore, the audio signal level input to the microphone 15 can be determined from the control signal level output from the gain control unit 7 to the PGA 10, and the system control means 20 monitors the audio signal level.

  Next, the operation of this embodiment will be described using the flowchart of FIG. First, when a shooting start button (not shown) is pressed, the system control unit 20 starts shooting and the input data is stored in the buffer memory 26. A first threshold value is set in the buffer memory 26, and when the amount of data stored in the buffer memory 26 exceeds the first threshold value, control is performed to record data in the buffer memory 26 on the optical disc 9.

  Furthermore, a second threshold value is set in the buffer memory 26 to prevent frequent recording operations on the optical disc 9 when there is an audio input of a predetermined level or more from the microphone 15 (when there is little data in the buffer memory). To prevent recording). In S301, it is determined whether or not the amount of data stored in the buffer memory 26 is greater than or equal to the second threshold value during shooting.

  In S302, the level detection unit 8 detects whether or not the audio signal level input from the microphone 15 is equal to or higher than a predetermined level. If sound of a predetermined level or higher is detected, the data stored in the buffer memory 26 is recorded on the optical disc 9 in S304. If an audio signal of a predetermined level or higher cannot be detected in S302, the process proceeds to S303, and it is determined whether the data accumulation amount is equal to or higher than the first threshold.

  If it is greater than or equal to the first threshold, the data stored in the buffer memory 26 is recorded on the optical disc 9 in S304. If it is less than or equal to the first threshold value in S303, the process proceeds to S302 and waits for input of a sound of a predetermined level or higher. If there is no voice input of a predetermined level or more after waiting, the data in the buffer memory 26 is recorded on the optical disk 9 when the data accumulation amount is the first threshold value or more in S303.

  An example of recording control according to the flowchart of FIG. 3 is shown in FIG. FIG. 4A is a diagram showing the audio input level input to the microphone 15, and the predetermined input audio used as a reference from the control signal level output from the gain control unit 7 to the PGA 10 as the audio signal level input from the microphone 15. Set the level. The predetermined input voice level is set to a level larger than the seek sound and the noise at the time of changing the rotation speed.

  FIG. 4B shows the relationship between the amount of data stored in the buffer memory 26 during shooting and the recording process. The first threshold value and the second threshold value are shown in the figure. During shooting, image data and audio data are stored in the buffer memory 26. When the data accumulation amount becomes equal to or higher than the first threshold level, a recording operation is executed, and the accumulated data in the buffer memory 26 is recorded on the optical disc 9.

  That is, when the amount of data stored in the buffer memory 26 exceeds the first threshold value, the spindle motor 19 is started, the optical head 27 is sought to the target address position, and the data in the buffer memory 26 is recorded on the optical disk 9. In addition, if the amount of data stored in the buffer memory 26 is greater than or equal to the second threshold when the audio input level from the microphone 15 is greater than or equal to a predetermined level, data is recorded on the optical disc 9.

  In the present embodiment, when the amount of data stored in the buffer memory 26 exceeds the second threshold at the time of shooting and audio input of a predetermined level or more from the microphone 15 continues, recording on the optical disk 9 is performed. Thus, when the audio input level is high and the data amount exceeds the second threshold, data is recorded on the optical disc. For this reason, recording to the optical disk is not performed frequently, and drive operation sounds such as a seek operation sound and a rotation change sound that the spindle motor 19 reaches to the target rotation speed become inconspicuous.

  The above is the description of the recording control operation for recording the image data and the audio data in the buffer memory 26 on the optical disc 9.

  Next, an operation for recording the disc management information on the optical disc 9 will be described. Normally, in a camera-integrated disc recording / reproducing apparatus, when shooting is stopped, image data and audio data are recorded on the optical disc 9 and then disc management information is recorded in a predetermined management information area of the optical disc 9.

  If there is an instantaneous interruption such as the battery of the device being disconnected before the photographing is stopped, the recorded data cannot be reproduced, so the management information is updated during the photographing. The management area area is on the inner circumference side of the optical disc 9, and the sound of the seek operation for moving the optical head 27 and the rotation change sound of the spindle motor 19 are recorded on the inner circumference side, resulting in noise. Therefore, it is desirable to record the management information when the management information is updated when a voice input of a predetermined level or higher is received.

  In the present embodiment, when a predetermined amount or more of data is accumulated in the buffer memory 26 and an audio input of a predetermined level or more is received, the operation of recording the data in the buffer memory 26 on the optical disk is executed. Alternatively, when there is an audio input of a predetermined level or higher, a recording operation in which management information is recorded on the optical disc can be executed to realize recording with reduced noise such as a seek sound and a spindle rotation speed change sound.

  Next, a second embodiment of the present invention will be described. FIG. 5 is a flowchart showing the recording operation of this embodiment. In this embodiment, a temperature sensor (not shown) is provided in the apparatus, and the optimum recording laser power is controlled by the system control means 20 when a temperature change is equal to or greater than a predetermined temperature change amount and an audio input exceeding a predetermined level is detected. A learning operation for determining a recording condition such as is performed.

  The apparatus configuration of the present embodiment is the same as that of FIG. 1, and a temperature sensor is arranged around the optical disc 9 as described above. The method for detecting the audio input level from the microphone 15 is the same as in FIG.

  In FIG. 5, first, when a shooting start button (not shown) is pressed, the system control means 20 starts shooting, accumulates input data in the buffer memory 26, and accumulates a predetermined amount or more of data, the buffer memory 26 data is recorded on the optical disk 9. Until the predetermined amount of data is accumulated, the servo operation is stopped, and the data is recorded on the optical disc by the intermittent operation.

  The learning operation is a process performed using the time when the intermittent operation is stopped. First, in S501, for example, the ambient temperature of the optical disk 9 is detected by a temperature sensor provided in the optical head 27, and it is determined whether or not a temperature change greater than a predetermined temperature change amount has occurred. When the temperature change of the ambient temperature of the optical disk 9 is equal to or greater than the predetermined temperature change amount in S501, the process proceeds to S502. In S502, the sound level detection unit 8 detects whether or not the sound input to the microphone 15 is equal to or higher than a predetermined level as described above.

  When a sound of a predetermined level or higher is detected in S502, a learning process for determining an optimum recording laser power or the like is executed in S504. Thereby, since the learning operation is executed when the voice input from the microphone 15 is large, similarly, the driving sound such as the seek operation sound or the spindle motor rotation speed change sound generated during the learning operation becomes inconspicuous.

  In the learning process, the learning process is generally performed by seeking the optical head to a predetermined test area on the inner circumference side of the optical disc. When the disc recording medium is a rewritable recording medium such as an RW disc, the recorded data can be erased, so the learning process may be executed in an unrecorded area of the user data area.

  If no sound of a predetermined level or higher can be detected in S502, the process proceeds to S503. In S503, when the elapsed time is equal to or longer than a predetermined time set in advance, the process similarly proceeds to S504 to execute the learning process.

  In the present embodiment, when there is a temperature change that is equal to or greater than a predetermined temperature change amount and there is an audio input that is greater than or equal to a predetermined level, a learning process such as determining the optimum recording laser power is executed. Therefore, drive sounds such as seek operation sounds and spindle motor rotation speed change sounds can be made inconspicuous.

1 is a system block diagram showing an embodiment of an information recording / reproducing apparatus according to the present invention. It is a block diagram which shows an automatic level adjustment circuit. It is a flowchart which shows the recording process which concerns on this invention. It is a figure explaining an example of recording control of the present invention. It is a flowchart which shows the learning process which concerns on this invention.

Explanation of symbols

7 Gain Control Unit 8 Level Detection Unit 9 Optical Disk 10 Programmable Gain Amplifier (PGA)
DESCRIPTION OF SYMBOLS 11 Camera part 12 CCD imager 13 Gain control A / D converter 14 Signal processing means 15 Microphone 16 Microphone amplifier 17 A / D converter 18 Servo control means 19 Spindle motor 20 System control means 21 Rack, pinion 22 Seek motor 23 Actuator 24 Light emitting element 25 Light receiving element 26 Buffer memory 27 Optical head 28 Recording / reproducing means

Claims (3)

An information recording / reproducing apparatus comprising: an imaging unit; an audio input unit; and a buffer memory for temporarily storing the image data captured by the imaging unit and the audio data input by the audio input unit. Detecting means for detecting an audio signal level, and recording the image and audio data of the buffer memory on an information recording medium when the audio signal level is detected by the detecting means at a predetermined level or more during photographing. A characteristic information recording / reproducing apparatus. 2. The information recording / reproducing apparatus according to claim 1, wherein when data exceeding a preset threshold value is accumulated in the buffer memory, image and audio data of the buffer memory are recorded on the information recording medium. A temperature detecting means for detecting an ambient temperature of the information recording medium, a temperature detecting means for detecting a temperature change equal to or greater than a preset temperature change amount by the temperature detecting means at the time of shooting, and detecting the audio signal level; The information recording / reproducing apparatus according to claim 1, wherein the learning operation is performed when the audio signal level is detected to be equal to or higher than a preset level.

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