JP2006302461A - Optical disk player - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk player capable of normally playing back even an optical disk having a difference between the boost amount of an equalizer having a best jitter value and a boost amount having a best error rate, or an optical disk having a best boost amount changed even in the middle of playing back. <P>SOLUTION: When an equalizer adjust mode is set during playing back, an equalizer adjust screen 242 showing the graph La of jitter values and the graph Lb of error rates is displayed by a display device 24. Then, when the up or down key of a remote controller is operated, the boost amount of the equalizer is increased/decreased. Accordingly, the graphs La and Lb shown in the equalizer adjust screen 242 are changed, and jitter values indicated by the graphs La and Lb, and/or a boot amount during error rate adjustment is set in the equalizer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to an optical disc reproducing apparatus for reproducing information recorded on an optical disc, and in particular,
The present invention relates to a process for adjusting the boost amount of an equalizer that controls the gain of an RF signal amplified by an RF amplifier.

As is known in the past, in an optical disk playback device that plays back information recorded on an optical disk such as a CD (compact disk) or DVD (digital versatile disk), the playback operation of the loaded optical disk is optimal. Therefore, the values of various parameters in the reproduction operation are automatically adjusted for each optical disc. The automatically adjusted parameters include, for example, focus balance, tracking balance, and RF signal equalizer characteristics. In addition, as an index for automatic adjustment of various parameters, the jitter value of the RF signal that is a reproduction signal read from the optical disc (the time variation of the clock obtained from the RF signal with respect to the standard clock) and the error of the RF signal A rate is used, and various parameters are automatically adjusted so that the jitter value and error rate are minimized.

The equalizer adjustment is performed to compensate for the deterioration of the signal waveform of the RF signal, which is a reproduction signal obtained by electrically reading information on the optical disk. The RF signal contains various frequency components. The higher the frequency, the lower the level (for example, 3T when the amplitude of the RF signal is small, and 14T when it is large). The jitter value of the RF signal is increased and deteriorated. Therefore, an equalizer adjustment is performed to boost frequency components of the RF signal so as to boost low-frequency components and to make the jitter value small (good).
JP 2002-74845 A JP-A-62-235827 JP-A-6-215307 JP-A-8-70324 JP 2001-357541 A

As described above, conventionally, in an optical disc reproducing apparatus, a jitter value of an RF signal that is a reproduction signal read from the optical disc and an error rate of the RF signal are used, and these jitter value and error rate are minimized. Various parameters are automatically adjusted. Such automatic adjustment is performed at the start-up of the operation of the device after the optical disk is loaded. After that, playback operation using the set various parameters is performed. Is done.

Among the various parameters, there is also an equalizer boost amount that controls the gain of the RF signal amplified by the RF amplifier. This boost amount is added to the jitter value of the RF signal when the apparatus is started after the optical disc is loaded. Is set based on. That is, when the apparatus is started up after the optical disk is loaded, a place where the jitter value of the RF signal becomes the best is searched, and the boost amount is set with the best jitter value to perform the equalizer adjustment.

However, depending on the optical disc, there are rare optical discs in which the best boost amount of the equalizer changes during reproduction, and in which the boost amount is better adjusted by the error rate than the jitter value. In other words, there are rare optical disks in which the boost amount point at which the jitter value is the best and the boost amount point at which the error rate is the best are different.

For example, as shown in FIG. 5, when the horizontal axis is taken as the boost amount of the equalizer and the vertical axis is taken as the jitter value or the error rate, as shown by the line L1, the error rate is between the boost amounts P1 and P2. For example, when the level becomes zero level (or the same level) for a long time, the point at which the error rate is minimized cannot be specified, and thus the point at which the boost amount is the best is not known. On the other hand, when viewed in terms of the jitter value as indicated by the line L2, the jitter value is the minimum (best) at the point a, and the boost amount point corresponding to the point a is the point where the boost amount is the best. I understand that.

However, when the point c at which the error rate is minimized as shown by the line L3 and the point a at which the jitter value is minimized as shown by the line L2 are shifted from the boost amount, the jitter value is reduced. When the boost amount is adjusted at the point a that becomes the minimum, the error rate at this time increases as shown by the point b on the line L3. When the boost amount is adjusted with the jitter value in this way, there are rarely optical disks that increase the error rate. For such an optical disk, the boost amount needs to be adjusted with the error rate.

However, since the conventional optical disk reproducing apparatus adjusts the boost amount only by the jitter value, the reproduction accuracy is lowered for a rare optical disk that should be adjusted by the error rate rather than the jitter value. Or a first problem that makes reproduction difficult.

In addition, in the case of recording and rewritable optical discs, when adding data, the equalizer boost amount is adjusted once on the innermost circumference of the optical disc at start-up. The recording state when data is written on the innermost circumference of the optical disk and the recording state when data is written toward the outer circumference by increasing the number of sessions may be changed. In other words, the best value of the boost amount of the equalizer when adjusted on the innermost periphery of the optical disc may be different from the best value of the boost amount of the equalizer with respect to the outer peripheral direction of the optical disc.

For example, in the case where data is recorded by the recording drive of company A in the recording area on the inner circumference side and data is recorded by the recording drive of company B in the recording area on the outer circumference side, for the same optical disc. Each company may have different laser power, etc. Therefore, the best value of the equalizer boost amount on the inner periphery side of the optical disc may be different from the best value of the equalizer boost amount on the outer periphery side of the optical disc. .

However, since the conventional optical disk playback apparatus only adjusts the boost amount of the equalizer once at the innermost periphery of the optical disk at the time of start-up, the recording state changes on the outer peripheral side of the optical disk during playback. There is a second problem that cannot be dealt with and the reproduction accuracy is lowered or the reproduction becomes difficult.

In the prior art of Patent Document 1, the best jitter point is detected while monitoring the jitter value and the boost amount is determined. However, since the boost amount can be adjusted even at the error rate, The first and second problems cannot be solved.

In the prior art of Patent Document 2, the reproduction equalizer is adjusted while viewing the output of the envelope detection circuit with a display device such as a waveform tube. However, the jitter value and the error rate are not disclosed, and the waveform tube is not disclosed. A display device must be prepared.

In the prior art of Patent Document 3, a reproduction signal is input to an oscilloscope, and the reproduction equalizer is adjusted so that the error rate is reduced while observing the eye pattern. However, it is impossible to cope with a good optical disc, and an oscilloscope must be prepared.

In the prior art of Patent Document 4, the equalized reproduction signal is displayed on an oscilloscope in an eye pattern and adjusted while being observed. However, the jitter value and error rate are not disclosed, and the oscilloscope is not used. Must be prepared.

In the prior art of Patent Document 5, in the case of the equalizer characteristic of an RF signal, various parameters are automatically adjusted based on the point where the jitter value or error rate is minimized, but the jitter value and error rate are changed during reproduction. Therefore, the first and second problems cannot be solved.

The present invention has been made to solve the above-described problems. An optical disc in which the boost amount of the equalizer having the best jitter value and the boost amount having the best error rate are different, or the best boost amount in the middle of reproduction. An object of the present invention is to provide an optical disk reproducing apparatus that can normally reproduce even an optical disk in which a change occurs.

In order to achieve the above object, an invention according to claim 1 is directed to an optical pickup that optically reads information recorded on an optical disc, and an R that amplifies an RF signal output from the optical pickup.
In an optical disk reproducing apparatus including an F amplifier and an equalizer for controlling the gain of an RF signal amplified by the RF amplifier, jitter value detecting means for detecting a jitter value of the RF signal output from the RF amplifier; An error rate detection means for detecting an error rate of the RF signal output from the RF amplifier, an equalizer adjustment mode setting means for setting an equalizer adjustment mode in response to a key operation, and whether the equalizer adjustment mode is set An equalizer adjustment mode determining means for determining whether or not the detected jitter value exceeds a predetermined value, and determining whether or not the detected error rate exceeds a predetermined value An error rate determination means for determining that the equalizer adjustment mode is set. Or when the jitter value determining means determines that the jitter value exceeds a predetermined value, or the error rate determining means determines that the error rate exceeds a predetermined value. The equalizer adjustment screen display means for displaying the equalizer adjustment screen in which the jitter value and the error rate are displayed in a graph on the display device, and the equalizer boost by operating the up key or the down key of the operation means. A boost amount increasing / decreasing means for increasing or decreasing the amount, and a boost amount setting means for setting a boost amount at the time of adjustment of the jitter value or / and error rate in the graph shown on the equalizer adjustment screen to the equalizer. An optical disc comprising a system controller having To provide a reproducing apparatus.

In this configuration, when the equalizer adjustment mode is set by the equalizer adjustment mode setting means in response to the key operation, and when the jitter value detection means determines that the jitter value detected by the jitter value detection means exceeds a predetermined value Alternatively, when the error rate determination means determines that the error rate detected by the error rate detection means has exceeded a predetermined value, the equalizer adjustment screen is displayed as an equalizer adjustment screen in which the jitter value and error rate are displayed in a graph. It is displayed on the display device by the means. When the up key or down key of the operating means is operated, the boost amount of the equalizer is increased or decreased by the boost amount increasing / decreasing means, and this changes the graph shown on the equalizer adjustment screen. The boost amount at the time of adjusting the jitter value or / and the error rate is set in the equalizer by the boost amount setting means.

According to this configuration, the current jitter value and error rate can be viewed as a graph on the equalizer adjustment screen during playback, and it is immediately known that the jitter value and error rate are the best. You can also set the boost amount that results in a jitter value, or you can set the boost amount that results in the best error rate, so that the equalizer boost amount that gives the best jitter value and the boost amount that gives the best error rate Even an optical disc with a different value or an optical disc whose best boost amount changes during playback can be normally played back.

According to a second aspect of the present invention, there is provided an optical pickup for optically reading information recorded on an optical disc, an RF amplifier for amplifying an RF signal output from the optical pickup, and a gain of the RF signal amplified by the RF amplifier. In an optical disk reproducing device configured to include an equalizer to be controlled, an equalizer adjustment screen is displayed on the display device when the equalizer adjustment mode is set, and a graph-like jitter value or / or displayed on the equalizer adjustment screen is displayed.
And an optical disk reproducing apparatus comprising a system controller for setting an amount of boost at the time of adjusting an error rate in an equalizer.

In this configuration, when the equalizer adjustment mode is set, an equalizer adjustment screen is displayed on the display device, and the amount of boost at the time of adjustment of the graph-like jitter or / and error rate shown on the equalizer adjustment screen is determined. Set to equalizer.

According to this configuration, the current jitter value and error rate can be viewed as a graph on the equalizer adjustment screen during playback, and it is immediately known that the jitter value and error rate are the best. You can also set the boost amount that results in a jitter value, or you can set the boost amount that results in the best error rate, so that the equalizer boost amount that gives the best jitter value and the boost amount that gives the best error rate Even an optical disc with a different value or an optical disc whose best boost amount changes during playback can be normally played back.

According to a third aspect of the present invention, in the second aspect of the present invention, the system controller includes a jitter value detecting means for detecting a jitter value of the RF signal output from the RF amplifier, and an error in the RF signal output from the RF amplifier. An error rate detecting means for detecting a rate; an equalizer adjustment mode setting means for setting an equalizer adjustment mode in response to a key operation; an equalizer adjustment mode determining means for determining whether or not the equalizer adjustment mode is set; Equalizer adjustment screen display means for displaying an equalizer adjustment screen on which a jitter value and an error rate are displayed in a graph when the equalizer adjustment mode determination means determines that the equalizer adjustment mode is set; and Operating the up key or down key of the operating means Boost amount increasing / decreasing means for increasing or decreasing the equalizer boost amount, and boost for setting the graph-like jitter value or / and error rate boost amount shown in the equalizer adjustment screen to the equalizer Quantity setting means.

Therefore, the system controller can realize jitter value detection processing, error rate detection processing, equalizer adjustment mode setting processing, equalizer adjustment mode determination processing, equalizer adjustment screen display processing, boost amount increase / decrease processing, and boost amount setting manual processing. This allows you to see the current jitter value and error rate as a graph on the equalizer adjustment screen during playback, so you can quickly see where the jitter value and error rate are the best, and boost the best jitter value. You can set the amount, or you can set the amount of boost that gives the best error rate.

According to a fourth aspect of the present invention, in the third aspect of the invention, the system controller includes a jitter value determining unit that determines whether or not the jitter value detected by the jitter value detecting unit exceeds a predetermined value, and an error rate detecting unit. An error rate determination means for determining whether or not the error rate detected by the method exceeds a predetermined value; and when the equalizer adjustment mode determination means determines that the equalizer adjustment mode is set, or the jitter value is When it is determined by the jitter value determining means that the predetermined value has been exceeded, or when the error rate determining means has determined that the error rate has exceeded the predetermined value, the jitter value and the error rate are displayed in a graph. And an equalizer adjustment screen display means for displaying on the display device the equalizer adjustment screen shown in FIG. A.

Therefore, the system controller can realize the jitter value determination process and the error rate determination process, and when the jitter value exceeds the predetermined value or the error rate exceeds the predetermined value, other than being set to the equalizer adjustment mode. Even when an error occurs, the equalizer adjustment screen display process that displays the equalizer adjustment screen with the jitter value and error rate displayed in a graph can be realized on the display device. Even when the rate exceeds the predetermined value, the equalizer adjustment screen is displayed on the display device, so that you can know that the jitter value and error rate have deteriorated during playback, so you can change the boost amount. It is possible to adjust the equalizer so that the jitter value and error rate are improved.

As described above, according to the present invention, the jitter value detecting means for detecting the jitter value of the RF signal output from the RF amplifier, and the error rate detecting means for detecting the error rate of the RF signal output from the RF amplifier, , An equalizer adjustment mode setting means for setting the equalizer adjustment mode in response to a key operation, an equalizer adjustment mode determination means for determining whether or not the equalizer adjustment mode is set, and the detected jitter value has a predetermined value. Jitter value determining means for determining whether or not the error rate has been exceeded, error rate determining means for determining whether or not the detected error rate has exceeded a predetermined value, and the equalizer adjustment mode being set to the equalizer adjustment mode When judged by the judging means, or when the jitter value exceeds a predetermined value, the jitter value judging means When the error rate determination means determines that the error rate has exceeded a predetermined value, an equalizer adjustment screen showing the jitter value and error rate in a graph is displayed on the display device. Equalizer adjustment screen display means, boost amount increase / decrease means for increasing or decreasing the boost amount of the equalizer by operating the up key or down key of the operation means, and graph-like jitter shown on the equalizer adjustment screen Since the system controller has a boost amount setting means for setting the boost amount at the time of adjusting the value or / and error rate in the equalizer, the current jitter value and error rate are displayed on the equalizer adjustment screen during playback. Jitter values and errors can be seen as a graph You can quickly determine the best point at which the data rate is best, so you can set the boost amount that results in the best jitter value, or you can set the boost amount that results in the best error rate. Thus, even an optical disc in which the boost amount of the equalizer that achieves the best is different from the boost amount that provides the best error rate, or an optical disc in which the best boost amount changes during reproduction can be normally reproduced.

Further, according to the present invention, when the equalizer adjustment mode is set, an equalizer adjustment screen is displayed on the display device, and the graph-like jitter value or / and error rate adjustment time point indicated on the equalizer adjustment screen is displayed. Since the system controller that sets the boost amount in the equalizer is equipped, the current jitter value and error rate can be viewed as a graph on the equalizer adjustment screen during playback, and the jitter value and error rate are the best Can quickly set the amount of boost that results in the best jitter value, or you can set the amount of boost that results in the best error rate, and therefore the equalizer boost that gives the best jitter value. Optical disc with a different amount and boost amount that gives the best error rate, or during playback Even optical disks good boost amount is changed, it is possible to play normally.

In short, according to these inventions, the boost amount of the equalizer can be arbitrarily changed in accordance with the situation of the optical disc to be reproduced.
It is possible to support reproduction with a special optical disc in which the boost amount with the best error rate is different or the best boost amount changes during reproduction.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a configuration of an optical disc reproducing apparatus according to an embodiment of the present invention.

In FIG. 1, this optical disk reproducing apparatus emits laser light and reproduces reflected light from the optical disk 1 to reproduce information recorded on the optical disk 1.
A spindle motor 2 that rotates the optical disc 1, a spindle drive circuit 19 that drives the spindle motor 2, a tracking drive circuit 17 that drives an actuator (not shown) that performs tracking servo of the optical pickup 3, and an optical pickup 3, a focus drive circuit 16 that drives an actuator (not shown) that performs focus servo, a sled 4 that moves the optical pickup 3 in the radial direction of the optical disc 1, and a sled drive circuit 18 that drives the sled 4. ing.

The optical disk reproducing apparatus also includes an RF amplifier 5 that amplifies an RF signal read by the optical pickup 3 during reproduction of the optical disk 1, an equalizer 20 that controls the gain of the RF signal from the RF amplifier 5, and a VCO (voltage controlled oscillator)
(Phase locked loop) 8 is provided with a data / synchronization signal separation circuit 6 that receives an RF signal from the equalizer 20 and separates the data from the synchronization signal, and receives data separated by the data / synchronization signal separation circuit 6 A data decoding error correction circuit 9 that performs error checking by decoding and corrects the data if there is an error and outputs correct data
And an AV decoding circuit 10 for inputting correct data from the data decoding error correction circuit 9 and decoding it to output a video signal and an audio signal.

Further, the disk reproducing apparatus detects a mirror signal indicating a mirror surface without a track on the optical disk 1 included in the RF signal from the RF amplifier 5 and counts the mirror surface. A tracking error detection circuit 11 for detecting a tracking error signal included in the RF signal, a focus error detection circuit 12 for detecting a focus error signal included in the RF signal from the RF amplifier 5, and a tracking error detection circuit 1
And a track cross detection circuit 13 for detecting a track cross based on the tracking error signal from 1 and outputting a track pulse.

In addition, the optical disk reproducing apparatus includes a CPU 15 that performs control and arithmetic processing, and the CPU 1
A flash ROM 23 in which programs and data necessary for the control and arithmetic processing of 5 are stored;
A RAM 21 for temporarily storing data necessary for control of the CPU 15 and arithmetic processing, and the CPU 1
5 includes a system controller 14 that controls each of the above-described components, and a remote controller 22 that transmits an operation signal to the system controller 14.

The system controller 14 performs control for focus servo of the optical pickup 3 based on the focus error signal included in the RF signal from the RF amplifier 5, and the optical pickup based on the tracking error signal included in the RF signal from the RF amplifier 5. 3 for tracking servo, control for driving the sled 4 via the sled drive circuit 18 to move the optical pickup 3 in the radial direction of the optical disc 1, control for rotating the spindle motor 2 via the spindle drive circuit 19 And so on.

Further, the system controller 14 includes a jitter value detection unit 141 that detects a jitter value of the RF signal output from the RF amplifier 5 and a component of the RF signal output from the RF amplifier 5 as the characteristic elements of the present embodiment. An error rate detecting means 142 for detecting an error rate, an equalizer adjustment mode setting means 143 for setting an equalizer adjustment mode in response to a key operation of the remote controller 22, and an equalizer adjustment for determining whether or not the equalizer adjustment mode is set. A mode determination unit 144; a jitter value determination unit 145 that determines whether or not the detected jitter value exceeds a predetermined value; and an error rate determination that determines whether or not the detected error rate exceeds a predetermined value. Means 146.

Further, the system controller 14 determines, when the equalizer adjustment mode determination unit 143 determines that the equalizer adjustment mode is set, or when the jitter value determination unit 145 determines that the jitter value exceeds a predetermined value. When the error rate determination means 146 determines that the error rate has exceeded a predetermined value, an equalizer adjustment screen showing the jitter value and error rate in a graph is displayed on the display device 24. By operating the equalizer adjustment screen display means 147 to be operated and the up key or the down key of the remote controller 22 (the up key or the down key if there is an up key and a down key in the main body operation unit not shown), the equalizer is displayed. Boo to increase or decrease the boost amount And a boost amount setting means 149 for setting the boost amount at the time of adjustment of the jitter value or / and error rate in the form of a graph shown on the equalizer adjustment screen to the equalizer 20. .

FIG. 2 is a configuration diagram showing an example of the arrangement of the operation keys of the remote controller 22 in the present embodiment. In FIG. 2, the remote controller 22 includes a power key PW, an up key (up direction key) a, a down key (down direction key) b, a left direction key c, a right direction key d, an enter key e, a playback key f, and a menu display. A key g and a plurality of other operation keys are provided. In particular, in the present embodiment, when the up key a is pressed in the equalizer adjustment mode, the boost amount of the equalizer 20 increases, and when the down key b is pressed, the boost amount of the equalizer 20 decreases.

FIG. 3 is a diagram showing a state where an example of an equalizer adjustment screen is displayed on the display device of the television receiver, for example, in the present embodiment. In the display device 24 shown in FIG. 3, reference numeral 241 denotes a video display screen on which a TV program video, a video reproduced by an optical disk playback device, and the like are displayed, and 242 denotes an equalizer adjustment screen. This equalizer adjustment screen 242 is a boost amount display area 243 for displaying the current boost amount of the equalizer 20.
A graph showing the jitter value display area 244 that shows the jitter value of the RF signal that changes when the boost amount is changed during reproduction, and the error rate of the RF signal that changes when the boost amount is changed during reproduction. The error rate display area 245 shown in FIG. In the jitter value display area 244, the horizontal axis indicates time, and the vertical axis indicates the level of jitter value. In the error rate display area 245, the horizontal axis indicates time, and the vertical axis indicates the error rate level.

In the jitter value display area 244, a line La shows a graph of jitter values that change when the boost amount of the equalizer 20 is increased during reproduction, for example, and the jitter value at the adjustment time t corresponds to the current boost amount. The jitter value to be displayed. From this jitter value graph,
It can be seen that the jitter value decreases in the time axis direction from the time point t1 (time point t1 is earlier than the adjustment time point t) to the adjustment time point t. If you continue to increase the boost amount,
When a place where the jitter value becomes larger appears, the boost amount is decreased, and if the boost amount is determined at the bottom of the jitter value graph, the boost amount at which the jitter value of the RF signal becomes the best is the equalizer 20. Will be set to.

In the error rate display area 245, the line Lb shows a graph of the error rate that changes when the boost amount of the equalizer 20 is increased during reproduction, for example, and the adjustment time t
The error rate at indicates the error rate corresponding to the current boost amount. From the graph of the error rate, it can be seen that the error rate decreases from the time point t2 (time point t2 is a time point before the adjustment time point t) to the adjustment time point t in the time axis direction. If you increase the boost amount as it is, and there is a place where the error rate increases, decrease the boost amount and determine the boost amount at the bottom of the error rate graph. The boost amount at which the rate is the best is set in the equalizer 20.

FIG. 4 is a flowchart for explaining processing for setting the boost amount of the equalizer in the present embodiment. A process for setting the boost amount of the equalizer will be described with reference to this flowchart and FIGS.

First, when an optical disc 1 to be played is loaded in the optical disc playback device (step S1).
Then, a startup operation is performed on the optical disc 1 (step S2). In this start-up operation, various parameters are automatically adjusted so that the jitter value of the RF signal that is the reproduction signal read from the optical disc 1 is minimized. This automatic adjustment has been performed conventionally.

Here, when the reproduction key f of the remote controller 22 is pressed (step S3), the system controller 14 rotates the spindle motor 2 via the spindle drive circuit 19, whereby the optical disk 1 rotates and the optical pickup 3 is rotated. As a result, the recording information of the optical disc 1 is optically read out, and an RF signal, which is a reproduction signal, is output from the optical pickup 3, and the reproduction operation for the optical disc 1 is started (step S4).

The remote controller 22 for the user to set the apparatus to the equalizer adjustment mode when the image quality of the reproduced video displayed on the display device 24 is reduced during the reproduction after the reproduction operation is started in this way. When the key operation is performed, the equalizer adjustment mode setting unit 143 of the system controller 14 sets the equalizer adjustment mode. As a key operation of the remote controller 22 for setting the equalizer adjustment mode, for example, when the menu display key g of the remote controller 22 is pressed, the equalizer adjustment screen 242 may be displayed on the display device 24.

The fact that the equalizer adjustment mode has been set means that the equalizer adjustment mode determination means 14
4 (step S5), the equalizer adjustment screen display means 147 of the system controller 14 displays the equalizer adjustment screen 242 in which the jitter value and the error rate are displayed in a graph through the AV decoding circuit 10. 24 (step S8).

The equalizer adjustment screen 242 is displayed when the jitter value determining means 145 determines that the jitter value of the RF signal from the RF amplifier 5 detected by the jitter value detecting means 141 exceeds a predetermined value (step S6), or when the error rate determination means 146 determines that the error rate of the RF signal from the RF amplifier 5 detected by the error rate detection means 142 has exceeded a predetermined value (step S7). . Even in such a case, the equalizer adjustment mode is set, and the equalizer adjustment screen 242 is displayed on the display device 24.

Then, when the user looks at the equalizer adjustment screen 242 displayed on the display device 24 and presses the up key a of the remote controller 22, the system controller 14 detects that the up key a is pressed (step S9). Thereby, the boost increase / decrease means 148 increases the boost amount of the equalizer 20 (step S10). On the other hand, when it is detected that the down key b is pressed (step S11), the boost increasing / decreasing means 148 decreases the boost amount of the equalizer 20 (step S12).

When the boost amount of the equalizer 20 is increased or decreased in this way and the best jitter value or / and the best error rate are determined, the boost amount setting means 149 determines the boost amount at the time of adjusting the jitter value or / and the error rate by the equalizer. 20 is set (step S13).
. Until the equalizer adjustment mode is terminated by operating the remote controller 22 (step S).
14) The processing from step S5 to step S14 is repeated.

As described above, according to the present embodiment, the current jitter value and error rate can be viewed as a graph on the equalizer adjustment screen during playback, and it is immediately understood that the jitter value and error rate are the best. This allows you to set the amount of boost that results in the best jitter value, or you can set the amount of boost that results in the best error rate,
Even an optical disc in which the boost amount of the equalizer having the best jitter value and the boost amount having the best error rate are different, or an optical disc in which the best boost amount changes during reproduction can be normally reproduced.

In short, according to the present embodiment, since the boost amount of the equalizer can be arbitrarily changed according to the situation of the optical disc to be reproduced, the boost amount with the best jitter value, the boost amount with the best error rate, It is possible to play back even with special optical discs where the best boost amount changes during playback.

It is a block diagram which shows the structure of the optical disk reproducing | regenerating apparatus concerning one Embodiment of this invention. It is the block diagram which showed an example of arrangement | positioning of the operation key of a remote control in the said embodiment. In the said embodiment, it is a figure which shows a mode that an example of the screen for equalizer adjustment is displayed on the display apparatus of a television receiver, for example. It is a flowchart for demonstrating the process for setting the boost amount of an equalizer in the said embodiment. It is a figure which shows the relationship of the jitter value and error rate with respect to the boost amount for demonstrating the optical disk from which the boost amount of the equalizer where a jitter value becomes the best, and the boost amount where an error rate becomes the best.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 3 Optical pick-up 5 RF amplifier 14 System controller 20 Equalizer 22 Remote control (operation means)
141 Jitter value detection means 142 Error rate detection means 143 Equalizer adjustment mode setting means 144 Equalizer adjustment mode determination means 145 Jitter value determination means 146 Error rate determination means 147 Equalizer adjustment screen display means 148 Boost amount increase / decrease means 149 Boost amount setting means a Up key b Down key

Claims (4)

An optical pickup that optically reads information recorded on an optical disc, an RF amplifier that amplifies an RF signal output from the optical pickup, and an equalizer that controls the gain of the RF signal amplified by the RF amplifier In the optical disc reproducing apparatus, the R
Jitter value detection means for detecting the jitter value of the RF signal output from the F amplifier, error rate detection means for detecting the error rate of the RF signal output from the RF amplifier, and equalizer adjustment mode in response to key operation Equalizer setting mode setting means for setting to, equalizer adjusting mode determination means for determining whether or not the equalizer adjustment mode is set, and jitter value determination for determining whether or not the detected jitter value exceeds a predetermined value Means, an error rate determination means for determining whether or not the detected error rate exceeds a predetermined value, and when the equalizer adjustment mode determination means determines that the equalizer adjustment mode is set, or When the jitter value determining means determines that the jitter value exceeds a predetermined value, or -When the error rate determination means determines that the rate has exceeded a predetermined value, an equalizer adjustment screen display means for displaying an equalizer adjustment screen in which the jitter value and the error rate are displayed in a graph on the display device; Boost amount increase / decrease means for increasing or decreasing the boost amount of the equalizer by operating the up key or the down key of the operation means, and the adjustment of the jitter value or / and error rate in the form of a graph shown on the equalizer adjustment screen An optical disk reproducing apparatus, comprising: a system controller having boost amount setting means for setting a boost amount at a time point in the equalizer. An optical pickup that optically reads information recorded on an optical disc, an RF amplifier that amplifies an RF signal output from the optical pickup, and an equalizer that controls the gain of the RF signal amplified by the RF amplifier When the equalizer adjustment mode is set, the equalizer adjustment screen is displayed on the display device when the equalizer adjustment mode is set, and the graph-like jitter value or / and error rate indicated on the equalizer adjustment screen is adjusted. An optical disk reproducing apparatus comprising a system controller for setting the boost amount of the equalizer in the equalizer. The system controller includes a jitter value detecting means for detecting a jitter value of an RF signal output from the RF amplifier, an error rate detecting means for detecting an error rate of the RF signal output from the RF amplifier, and responding to a key operation. The equalizer adjustment mode setting means for setting the equalizer adjustment mode, the equalizer adjustment mode determination means for determining whether or not the equalizer adjustment mode is set, and the equalizer adjustment mode determination that the equalizer adjustment mode is set By operating the equalizer adjustment screen display means for displaying on the display device an equalizer adjustment screen in which the jitter value and the error rate are displayed in a graph when determined by the means, and the up key or the down key of the operation means. Increase equalizer boost amount or A boost amount increasing / decreasing means for decreasing, and a boost amount setting means for setting, in the equalizer, a boost amount at the time of adjustment of a graph-like jitter value or / and error rate shown on the equalizer adjustment screen. Claim 2
An optical disk reproducing device according to claim 1. The system controller includes: a jitter value determination unit that determines whether or not the jitter value detected by the jitter value detection unit exceeds a predetermined value; and whether the error rate detected by the error rate detection unit exceeds a predetermined value. An error rate determination means for determining whether or not the equalizer adjustment mode is determined by the equalizer adjustment mode determination means, or that the jitter value exceeds a predetermined value. When the error rate determination means determines that the error rate has exceeded a predetermined value, an equalizer adjustment screen showing a jitter value and an error rate in a graph is displayed on the display device. 4. An equalizer adjustment screen display means for enabling Of the optical disc playback apparatus.

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