JP2006236422A - Optical disk reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk reproducing device which reproduces multichannel or 2-channel audio signals recorded to an optical disk in accordance with outputting modes of audio signals of external equipment without changing layers of the optical disk and executing an area-selecting operation. <P>SOLUTION: The optical disk reproducing device is provided with; a reading part which reads audio signals which are recorded to a first recording layer or a second recording layer, and management information; a signal processing part which subjects the audio signals read by the reading part to signal processing; an outputting part which outputs the audio signals which are subjected to the signal processing by the signal processing part; an inputting part which inputs information which indicates the outputting modes of audio signals of external equipment from the external equipment connected to the outputting part; and a control part which controls the reading part to make the reading part read from an optical disk, audio signals which conform to information indicating the outputting modes inputted from the inputting part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical disk reproducing apparatus for reproducing an audio signal recorded on an optical disk.

  There is a CD-DA (Compact Disc-Digital Audio) as an optical disc on which a digital audio signal is recorded. This CD-DA records a 16-bit digital audio signal sampled at a sampling frequency of 44.1 kHz at a track pitch of 1.6 μm. On the other hand, there is an optical disc with a high recording density in which a sampling frequency is 2822.4 kHz and a 1-bit digital audio signal subjected to delta-sigma modulation is recorded with a track pitch of 0.74 μm.

  This high recording density optical disc has a recording layer (hereinafter referred to as an HD (High Definition) layer) on which a 1-bit digital audio signal sampled at 2822.4 kHz and subjected to delta-sigma modulation is recorded, and at 44.1 kHz. There is a hybrid layer disc having two recording layers, a recording layer (hereinafter referred to as a CD layer) on which a sampled 16-bit digital audio signal is recorded. In addition to this hybrid layer disc, there is a single layer disc having only one HD layer and a dual layer disc having two HD layers. In the high recording density optical disc, the HD layer has a 2-channel stereo area for recording 2-channel digital audio signals and a multi-channel area for recording multi-channel digital audio signals up to 6 channels.

  Of these high recording density optical discs, hybrid layer discs usually have tracks in which digital audio signals of the same content are recorded in the 2-channel stereo area, multi-channel area and CD layer of the HD layer.

  An optical disc playback apparatus capable of playing back such an optical disc can switch playback between the HD layer and the CD layer (see, for example, Patent Document 1). In addition, when reproducing an HD layer, a 2-channel stereo area and a multi-channel area can be selected.

  Normally, an optical disc playback apparatus that plays back an optical disc on which a multi-channel audio signal is recorded is connected to an AV (Audio Visual) amplifier as an external device. The AV amplifier performs surround processing on the input audio signal and separates it into audio signals of each channel. The audio signal separated for each channel is converted into an analog signal and then output from a plurality of speakers connected to the AV amplifier.

  A plurality of speakers such as left and right front speakers, a center speaker, left and right surround speakers, and a subwoofer can be connected to the AV amplifier as a multi-channel speaker system. Also, the user can set the type of connected speaker, the presence or absence of the speaker, the playback level of each channel, and the like.

Japanese Patent Laid-Open No. 11-296861

  When a user uses a multi-channel speaker system (for example, 5.1 channel speaker system), the AV amplifier includes left and right front speakers, a center speaker, left and right surround speakers, and a subwoofer. Set the audio signal output mode to multi-channel. Here, when playing back a high recording density optical disc, the user operates the optical disc playback device to switch the playback layer to the HD layer, and then selects the multi-channel area, thereby connecting the speaker connected to the AV amplifier. Therefore, it is possible to listen to an audio signal having a surround effect.

  Further, the user may select a listening environment using a two-channel stereo speaker system (left and right front speakers). In this case, the user sets the audio amplifier to have two left and right front speakers and no other speakers, and sets the audio signal output form to two channels. Here, when a user plays an optical disc with a high recording density, by performing an operation of switching the layer to be played back to the CD layer or an operation of switching to the HD layer in the optical disc playback device, by selecting a 2-channel stereo area, A two-channel stereo audio signal can be heard from a speaker connected to the AV amplifier.

  As described above, when a user plays an optical disc with a high recording density using an optical disc playback device connected to an AV amplifier, the CD layer of the optical disc to be played is each time depending on the output format of the audio signal of the AV amplifier. And switching between HD layers and selecting the HD layer 2-channel stereo area and multi-channel area had to be performed.

  The present invention has been made to solve the above-mentioned problems, without switching between the CD layer and the HD layer of the optical disc to be reproduced and selecting the 2-channel stereo area and the multi-channel area of the HD layer. An object of the present invention is to provide an optical disk reproducing apparatus capable of reproducing multi-channel or two-channel audio signals recorded on an optical disk in accordance with the output form of an audio signal of an AV amplifier.

  In order to solve the above problems, the invention according to claim 1 of the present application includes a first recording layer having a stereo area in which a two-channel audio signal is recorded and a multi-channel area in which a multi-channel audio signal is recorded. A second recording layer on which two-channel audio signals are recorded; management information for managing the audio signals recorded on the first recording layer is recorded on the first recording layer and recorded on the second recording layer; In an optical disc reproducing apparatus for reproducing an optical disc in which management information for managing an audio signal is recorded on the second recording layer, reading the audio signal and management information recorded on the first recording layer or the second recording layer A signal processing unit that performs signal processing on the audio signal read by the reading unit, and an signal processing unit that performs signal processing. An output unit that outputs a video signal, an input unit that inputs information indicating an output form of an audio signal of the external device from an external device connected to the output unit, and information that indicates the output form input from the input unit And a control unit for controlling the reading unit so as to read an audio signal corresponding to the optical signal from the optical disc.

  Further, in the invention according to claim 2 of the present application, in the optical disc playback apparatus according to claim 1, when the information indicating the output form input from the input unit is information indicating multi-channel, the control unit includes: The reading unit is controlled to read a multi-channel audio signal from a multi-channel area of the first recording layer.

Further, in the invention according to claim 3 of the present application, in the optical disc reproducing apparatus according to claim 1, when the information indicating the output form input from the input unit is information indicating two channels, the control unit The reading unit is controlled to read a two-channel audio signal from the stereo area of the first recording layer.

  Further, in the invention according to claim 4 of the present application, in the optical disc reproducing apparatus according to claim 1, when the information indicating the output form input from the input unit is information indicating two channels, the control unit The reading unit is controlled to read two-channel audio signals recorded on the second recording layer.

  Further, in the invention according to claim 5 of the present application, in the optical disk reproducing apparatus according to claim 1, when the information indicating the output form input from the input unit is information indicating two channels, the control unit The signal processing unit is controlled to read the multi-channel audio signal from the multi-channel area of the first recording layer and to downmix the multi-channel audio signal into a 2-channel audio signal. It is characterized by controlling.

  According to the optical disk playback apparatus of the present invention, the audio signal output from the AV amplifier can be performed without switching the CD layer and the HD layer of the optical disk to be played back and selecting the 2-channel stereo area and the multi-channel area of the HD layer. According to the form, it is possible to provide an optical disc reproducing apparatus capable of reproducing multi-channel or two-channel audio signals recorded on an optical disc.

  Hereinafter, description will be given based on the embodiment of the present invention. An optical disc playback apparatus according to an embodiment of the present invention includes a hybrid layer disc having an HD layer and a CD layer recording layer, a single layer disc having only one HD layer, a dual layer disc having two HD layers, and a CD. And an optical disk reproducing apparatus capable of reproducing a digital audio signal recorded on an optical disk such as a DVD (Digital Versatile Disc).

  FIG. 1 is a block diagram showing a configuration of an optical disk reproducing apparatus according to an embodiment of the present invention. In FIG. 1, 1 is a turntable, 2 is a spindle motor, 3 is a servo control unit, 4 is an optical pickup, 5 is a reproduction amplifier, 6 is a signal processing unit, 7 is a memory control unit, and 8 is a RAM (Random Access Memory). , 9 is a DAC (Digital to Analog Converter), 10 is a digital interface (digital I / F), 11 is a control unit, 12 is an operation unit, and 13 is a display unit.

  The turntable 1 fixed to the spindle motor 2 mounts an optical disk. When a user operates an operation button provided on an operation unit (not shown) and an instruction to start reproduction is given, the servo control unit 3 performs control to rotate the spindle motor 2 at a predetermined linear velocity. The servo control unit 3 controls a focus servo circuit and a tracking servo circuit (not shown) so that the laser light from the optical pickup 4 serving as a reproduction unit correctly traces the pit row of the optical disk.

  The optical pickup 4 includes a laser diode and an objective lens (not shown). When reading a digital audio signal recorded on a CD or CD layer, a laser beam having a wavelength of 780 nm is used. When reading a digital audio signal recorded on an HD layer, a laser beam having a wavelength of 650 nm is used. Further, the optical pickup 4 can adjust the numerical aperture of the objective lens so that both the CD layer and the HD layer are focused.

  The digital audio signal read by the optical pickup 4 is shaped and amplified by the reproduction amplifier 5 and input to the signal processing unit 6. The signal processing unit 6 demodulates the digital audio signal read from the CD or CD layer, demodulates the digital audio signal read from the HD layer, extracts an error signal such as a focus error signal and a tracking error signal, and extracts a synchronization signal. A digital audio signal is input to the memory control unit 7. Further, the signal processing unit 6 performs a process of down-mixing the multi-channel digital audio signal into a 2-channel stereo digital audio signal under the control of the control unit 11.

  The memory control unit 7 controls the input digital audio signal to be input to the RAM 8. The RAM 8 stores the input digital audio signal. The digital audio signal stored in the RAM 8 is read out and input to the DAC 9 under the control of the memory control unit 7. The DAC 9 converts the digital audio signal into an analog audio signal. The analog audio signal converted by the DAC 9 is output from the output terminal.

  The digital audio signal read from the RAM 8 is input to the digital I / F 10 under the control of the memory control unit 7. The digital I / F 10 is a digital interface compliant with the HDMI (High-Definition Multimedia Interface) standard, and includes an HDMI terminal. HDMI is an extension of DVI (Digital Video Interface), an interface used to connect PCs and monitors. A single cable (HDMI terminal connection cable) is used to send and receive digital audio signals, digital video signals, and control information signals. ).

  The control information signal input to the digital I / F 10 indicates information about the external device connected to the HDMI terminal. When an AV amplifier is connected as an external device, the manufacturer name, product code, serial number, audio signal of the AV amplifier This represents information such as the output form. The input control information signal is input to the control unit 11 via the digital I / F 10.

  The control unit 11 controls the servo control unit 3, the signal processing unit 6, the memory control unit 7, the digital I / F 10, and the display unit 13. Further, the control unit 11 analyzes a control information signal input from the digital I / F 10. The operation unit 12 includes a playback button, a playback stop button, a fast forward button, and a fast reverse button. The display unit 13 displays the reproduction time of the currently reproduced track, the track number, information indicating whether or not the multi-channel audio signal is down-mixed into a 2-channel stereo audio signal, and the like.

  FIG. 2 is a diagram for explaining the connection between an optical disk reproducing apparatus and an AV amplifier according to an embodiment of the present invention. In FIG. 2, reference numeral 21 denotes an optical disk reproducing apparatus of the present embodiment, 22 denotes an HDMI compatible AV amplifier, 23 denotes an HDMI connection cable, and 24 denotes a video / audio connection code. The optical disk playback device 21 is connected to an AV amplifier 22 as an external device by an HDMI connection cable 23. Further, the optical disk playback device 21 is connected to the AV amplifier 22 by a video / audio connection cord 24. This is because the digital audio signal recorded on the optical disk may not be output depending on the type of the optical disk to be reproduced. In this case, the digital audio signal is converted into an analog audio signal and output. A plurality of speakers, monitors, etc. (not shown) are connected to the AV amplifier 22.

Next, the structure of the HD layer included in the high recording density optical disc described above will be described.
In the HD layer, a lead-in zone, a signal zone, and a lead-out zone are formed from the inner periphery to the outer periphery of the optical disc. The signal zone includes a master TOC area, an audio area, and an extra signal area. In the master TOC area, management information such as information about the disc, information about the area, and information about the track is recorded. The audio area includes a 2-channel stereo area in which 2-channel digital audio signals are recorded and a multi-channel area in which multi-channel digital audio signals up to 6 channels are recorded.

  The 2-channel stereo area and the multi-channel area have track areas in which digital audio signals are recorded in the order of track numbers, and an area TOC is arranged before and after the track area. The same information is recorded in these two areas TOC. In the area TOC arranged in the 2-channel stereo area, information for managing tracks of 2-channel digital audio signals recorded in the track area is recorded. The area TOC arranged in the multi-channel area stores information for managing tracks of multi-channel digital audio signals recorded in the track area. The extra signal area is an area where signals other than audio signals can be recorded.

  The CD layer has the same structure as the recording layer of the CD, and a lead-in area, a program area, and a lead-out area are formed from the inner periphery to the outer periphery of the optical disc. In the program area, 2-channel digital audio signals are recorded in units of tracks. In the lead-in area, TOC information for managing tracks recorded in the program area is recorded.

  Since the digital audio signal reproduced from the HD layer of the high recording density optical disc described above is currently prohibited from being output as a digital signal from the optical disc reproducing apparatus, an analog audio signal converted by the DAC 9 is outputted. In addition, digital audio signals reproduced from CD layers or CDs of optical discs with high recording density can be output as digital signals from the optical disc playback device, and therefore output from the HDMI terminal via the digital I / F 10. Can do.

  FIG. 3 is a flowchart for explaining the reproducing operation of the optical disk reproducing apparatus according to the embodiment of the present invention. As shown in FIG. 2, the optical disk reproducing apparatus of this embodiment is connected to an AV amplifier by an HDMI connection cable and a video / audio connection cord.

  Step S1 in the flowchart shown in FIG. 3 is a step in which the user mounts the optical disc on the optical disc reproducing apparatus of the present embodiment. In this embodiment, the optical disk to be mounted on the optical disk playback apparatus is the above-described high recording density optical disk.

  In step S2, the control unit 11 performs control to read information recorded in the master TOC area of the HD layer. When the optical disk is fixed to the turntable 1, the control unit 11 controls the servo control unit 3 so that the optical pickup 4 reads information recorded in the master TOC area of the HD layer. The information recorded in the read master TOC area is stored in a storage unit (not shown) built in the control unit 11.

  Step S3 is a step in which the control unit 11 analyzes the control information signal input from the AV amplifier via the digital I / F 10, and determines the output form of the audio signal of the AV amplifier. If the output form of the audio signal indicates multi-channel, the process proceeds to step S4. If the output form of the audio signal indicates two channels, the process proceeds to step S5.

  In this embodiment, the audio signal output form of the AV amplifier is multi-channel and 2-channel. When the audio signal output form of the AV amplifier is multi-channel, the user may set the output destination of the audio signal as a speaker, or the user may set the presence / absence of the speaker as being present in all speakers. is there.

  On the other hand, when the audio signal output form of the AV amplifier is 2 channels, the user has left and right front speakers when the user sets the output destination of the audio signal as a speaker provided in the HDMI monitor. In some cases, other speakers are not set.

  Step S4 is a step in which the control unit 11 performs control to reproduce the digital audio signal recorded in the multi-channel area of the HD layer. The control unit 11 controls the servo control unit 3 and the signal processing unit 6 so as to reproduce the digital audio signal recorded in the multi-channel area of the HD layer. The digital audio signal reproduced from the multi-channel area of the HD layer is converted into an analog audio signal by the DAC 9 and then output from the output terminal to the AV amplifier. Here, when the HD layer does not have a multi-channel area, the control unit 11 performs control to reproduce the digital audio signal recorded in the 2-channel stereo area of the HD layer.

  As described above, when it is determined that the output form of the audio signal of the AV amplifier is multi-channel in step S3, the optical disc playback apparatus of this embodiment is recorded in the multi-channel area of the HD layer of the optical disc in step S4. Playback of the digital audio signal started. Therefore, the optical disc playback apparatus of this embodiment outputs a multi-channel audio signal without the user performing an operation of switching layers and an operation of selecting an area according to the output format of the audio signal of the AV amplifier. Can do.

  Step S5 is a step of determining whether or not the HD layer of the optical disc on which the control unit 11 is mounted has a 2-channel stereo area. The control unit 11 determines the presence / absence of the 2-channel stereo area of the HD layer from the information recorded in the master TOC area read in step S2. If it is determined that the HD layer has a 2-channel stereo area, the process proceeds to step S6. If it is determined that the HD layer does not have a 2-channel stereo area, the process proceeds to step S7.

  Step S6 is a step in which the control unit 11 performs control to reproduce the digital audio signal recorded in the 2-channel stereo area of the HD layer. The control unit 11 controls the servo control unit 3 and the signal processing unit 6 so as to reproduce the digital audio signal recorded in the 2-channel stereo area of the HD layer. The digital audio signal reproduced from the 2-channel stereo area of the HD layer is converted into an analog audio signal by the DAC 9 and then output from the output terminal to the AV amplifier.

  As described above, the optical disk reproducing apparatus of the present embodiment determines that the output form of the audio signal of the AV amplifier is two channels in step S3, and has a two-channel stereo area in the HD layer of the optical disk to be reproduced in step S5. If it is determined, reproduction of the digital audio signal recorded in the 2-channel stereo area is started in step S6. Therefore, the optical disc playback apparatus of the present embodiment outputs a 2-channel audio signal without the user performing an operation of switching layers and an operation of selecting an area according to the audio signal output form of the AV amplifier. Can do.

  Step S7 is a step of determining whether or not the optical disc on which the control unit 11 is mounted has a CD layer. From the information recorded in the master TOC area read in step 2, the control unit 11 determines whether or not the mounted optical disk has a CD layer. If it is determined that the CD layer is provided, the process proceeds to step S8. If it is determined that the CD layer is not provided, the process proceeds to step S9.

  Step S8 is a step in which the control unit 11 performs control to reproduce the 2-channel digital audio signal recorded on the CD layer. The control unit 11 controls the servo control unit 3 and the signal processing unit 6 so as to reproduce the 2-channel digital audio signal recorded on the CD layer. The 2-channel digital audio signal reproduced from the CD layer is output from the HDMI terminal to the AV amplifier via the digital I / F 10.

  The optical disk playback apparatus of this embodiment determines that the output form of the audio signal of the AV amplifier is 2 channels in step S3, and determines that the HD layer of the optical disk to be played back does not have a 2-channel stereo area in step S5. If it is determined in step 7 that the CD layer is provided, playback of the 2-channel digital audio signal recorded in the CD layer is started in step S8. Therefore, the optical disc playback apparatus of the present embodiment outputs a 2-channel audio signal without the user performing an operation of switching layers and an operation of selecting an area according to the audio signal output form of the AV amplifier. Can do.

  In step S9, the control unit 11 performs control to downmix the digital audio signal reproduced from the multi-channel area of the HD layer into a 2-channel stereo digital audio signal. The control unit 11 controls the signal processing unit 6 to reproduce the digital audio signal recorded in the multi-channel area of the HD layer and downmix the reproduced multi-channel digital audio signal into a 2-channel stereo digital signal. . The downmixed digital audio signal is converted to an analog audio signal by the DAC 9 and then output from the output terminal to the AV amplifier.

  In step S9 of the flowchart shown in FIG. 3, the optical disk playback apparatus of the present embodiment downmixes the multi-channel digital audio signal played back from the multi-channel area into a 2-channel stereo digital signal. Even a single-layer disc having no 2-channel stereo area and no CD layer can output 2-channel audio signals.

  If it is determined in step S5 in the flowchart shown in FIG. 3 that the HD layer of the optical disk to be played back does not have a two-channel stereo area, the optical disk playback apparatus of this embodiment described above does not perform step S7 but performs step S9. You may make it perform the process of. In this case, the optical disk reproducing apparatus of this embodiment can output a two-channel audio signal without determining whether or not the optical disk to be reproduced has a CD layer.

1 is a block diagram showing a configuration of an optical disk reproducing apparatus that is an embodiment of the present invention. The figure explaining the connection of the optical disk reproducing device which is an Example of this invention, and AV amplifier. The flowchart explaining the reproduction | regeneration operation | movement of the optical disk reproducing | regenerating apparatus which is an Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Turntable, 2 ... Spindle motor, 3 ... Servo control part, 4 ... Optical pick-up, 5 ... Reproduction amplifier, 6 ... Signal processing part, 7 ... Memory control part, 8 ... RAM, 9 ... DAC, 10 ... Digital I / F, 11 ... control unit, 12 ... operation unit, 13 ... display unit, 21 ... optical disk playback device, 22 ... AV amplifier, 23 ... HDMI connection cable, 24 ... video / audio code

Claims (5)

A first recording layer having a stereo area in which a two-channel audio signal is recorded and a multi-channel area in which a multi-channel audio signal is recorded; and a second recording layer in which a two-channel audio signal is recorded. An optical disc on which management information for managing an audio signal recorded on the recording layer is recorded on the first recording layer, and management information for managing an audio signal recorded on the second recording layer is recorded on the second recording layer In an optical disc playback apparatus for playing back
A reading unit for reading an audio signal and management information recorded in the first recording layer or the second recording layer;
A signal processing unit that performs signal processing on the audio signal read by the reading unit;
An output unit for outputting an audio signal subjected to signal processing by the signal processing unit;
An input unit for inputting information indicating an output form of an audio signal of the external device from an external device connected to the output unit;
An optical disc reproducing apparatus comprising: a control unit that controls the reading unit so as to read an audio signal corresponding to information indicating the output form input from the input unit from the optical disc. The optical disk reproducing apparatus according to claim 1, wherein
When the information indicating the output form input from the input unit is information indicating multi-channel, the control unit reads the multi-channel audio signal from the multi-channel area of the first recording layer. An optical disc reproducing apparatus for controlling The optical disk reproducing apparatus according to claim 1, wherein
When the information indicating the output form input from the input unit is information indicating two channels, the control unit causes the reading unit to read an audio signal of two channels from the stereo area of the first recording layer. An optical disc reproducing apparatus characterized by controlling. The optical disk reproducing apparatus according to claim 1, wherein
When the information indicating the output form input from the input unit is information indicating two channels, the control unit causes the reading unit to read the two-channel audio signal recorded on the second recording layer. An optical disc reproducing apparatus characterized by controlling. The optical disk reproducing apparatus according to claim 1, wherein
When the information indicating the output form input from the input unit is information indicating two channels, the control unit reads the multi-channel audio signal from the multi-channel area of the first recording layer. And controlling the signal processing unit so as to downmix the multi-channel audio signal into a 2-channel audio signal.

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