JP2001285771A - Disk variable speed reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To intellectually recognize a reproduction speed corresponding to the contents of video images or the contents of audio information and to vary the reproduction speed. SOLUTION: In this reproducing device capable of double speed reproduction, a motion information detection part 161 obtains detection signals VDL for detecting image motions by using video signals reproduced from a disk 10. An audio information judgment part 162 obtains the detection signals ADL for detecting an audio level by using audio signals reproduced from the disk 10. A comparison part 160 compares a user set level with the detection signals VDL and/or ADL and a main MPU part 16 sets a double speed reproduction mode in the case that a detection signal level is higher.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk variable-speed playback device applied to, for example, a device for playing a digital multi-function disk (DVD).

[0002]

2. Description of the Related Art A conventional disk reproducing apparatus is provided with a function of switching a reproduction mode such as normal reproduction and double speed reproduction. However, if this function is normal playback,
Normal playback at a constant speed is continued from the beginning to the end, and in the case of double speed playback, the set double speed is continued from the beginning to the end.

[0003] However, depending on the contents of the image, there is a case where it is desired to skip the reproduction even in the normal reproduction. For example, there is a case where the video is reproduced for a long time (for example, a desert landscape continues) with almost no change in the image content and close to a still image.

Switching to the double-speed playback mode in such a case is inconvenient because the playback speed is too fast this time when there is a motion in the video content (for example, when an animal appears).

[0005]

As described above, in the conventional reproducing apparatus, there is switching between the normal reproducing mode and the double-speed reproducing mode, but it may be inconvenient depending on the contents of the video.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a variable reproducing speed device capable of intelligently recognizing a reproducing speed according to the contents of video or audio information and changing the reproducing speed.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a reproducing apparatus capable of double-speed reproduction, which detects motion information of an image using a video signal reproduced from a recording medium. Detecting means, comparing means for comparing the motion information detected by the motion detecting means with a level set by a user, and speed variable means for changing a reproduction speed based on the comparison information obtained from the comparing means. It is provided with.

According to another aspect of the present invention, in a reproducing apparatus capable of double-speed reproduction, a level detecting means for detecting an audio level using an audio signal reproduced from a recording medium, and a detection signal from the frequency detecting means set by a user. And a speed varying means for changing the reproduction speed based on the comparison information obtained from the comparing means.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.
The DVD (Digital Versatile Disk) video player has a disk drive unit 12 that drives the DVD 10 to rotate and reads information recorded on the DVD 10.

The information read from the disk drive unit 12 is input to a data processing unit 13. The data processing unit 13 executes error correction processing, demodulation processing (16 → 8-bit conversion) of the read data, and the like. The disk drive unit 12 includes a disk motor, a pickup head, a head feeding device, a focus servo mechanism, a tracking servo mechanism, a speed control unit, and the like.

The data output from the data processing unit 13 is input to the separation unit 140 of the decoder unit 14. The separation unit 140 separates the main video packet, the sub video packet, and the audio packet, and supplies each packet to the corresponding video decoding unit 141, sub video decoding unit 142, and audio decoding unit 143.

The video decoding section 141 decodes a video signal compressed based on, for example, the MPEG2 standard based on the DVD standard. The sub-picture decoding unit 142 decodes sub-pictures (characters, characters and graphics of video subtitles, etc.) that have been run-length compressed based on the DVD standard. The audio decoding unit 143 can decode linear PCM information based on the DVD standard, Dolby (registered trademark) type compression information, and the like.

The main video signal decoded by the video decoding unit 141 and the sub video signal decoded by the sub video decoding unit 142 are input to the video processing unit 144. Here, luminance adjustment, color adjustment, and the like are performed, and the sub-video signal is selectively multiplexed on the main video signal. The reason that selective multiplexing is described is that, in the DVD standard, for example, as subtitles corresponding to a main video, character subtitles of a plurality of countries (up to 32 types) can be recorded. Can be selected by the user. Also,
It is also possible to make no selection and not display at all.

The audio signal decoded by the audio decoder 143 is converted to a digital / analog (D / A) converter 145.
And converted into an analog signal.

An output video signal from the video processing section 144 and an audio output signal from the D / A converter 145 are guided to the AV output section 15 and supplied to a display and a speaker system connected thereto, respectively. Also in the audio system, for example, it is possible to select or combine streams of 9 channels.

The main MPU 16 has a function of controlling the entire system, and has an input unit 1 for giving an operation input (input by key operation or remote control operation).
7 is also connected, and a display unit 18 for displaying an operation state (operation mode such as reproduction, fast-forward, frame advance) is also connected.

A system time clock (STC) section 20 generates a system clock which is a basis for the timing of the entire reproducing apparatus, and supplies it to each circuit block.
The STC unit 20 also has a function of adjusting the reference time information inside the playback device to the time information reproduced from the disc. Therefore, the decoding time and the output time of each of the decoding units 141, 142, 143 can be synchronized.

Next, the characteristic operation of the above device will be described.

In the main MPU 16, blocks showing the features of the present invention are shown. Either one or both of the image motion information detection information from the motion information detection unit 161 and the detection information from the audio information determination unit 162 can be input to the comparison unit 160.

The comparing section 160 compares, for example, the level of the motion information obtained from the motion information detecting section 161 with the set level from the level setting section 17 provided in the input section. Then, the determination result is supplied to the reproduction speed control unit 163. The reproduction speed control unit 163 controls the disk reproduction speed through the disk drive unit 12.

FIG. 2 is a flowchart showing the characteristic operation of the apparatus according to the present invention. First, when the reproduction is started, it is determined whether or not the mode is the variable speed reproduction mode (steps A1 and A2). If the user desires the variable speed mode, the user can set the variable speed mode via the input unit 17. When the variable speed mode is set, the user can set and input a level to the level setting unit 17 provided in the input unit.

When the variable speed mode is set, the comparing section 160 in the main MPU section 16 controls the detection level VDL obtained from the average value of the motion vectors from the motion information detecting section 161 and the level setting section 163. Comparison with the set level RL is performed (step A3). When the detection level VDL> the setting level RL, the double speed reproduction is executed via the reproduction speed control unit 163. During the double speed reproduction period, the detection level VDL is constantly compared with the set level RL.

When the detection level VDL is smaller than the set level RL (VDL <RL), normal reproduction is executed (A4), while when the detection level VDL is opposite (VDL> RL), double speed reproduction is performed (step A5). ).

During this playback, it is also determined whether or not the playback end time has come (A6). If it is not the end time, the process returns to step A2, and if the end time comes, the playback ends.

The present invention is not limited to the above embodiment. In the above-described embodiment, the detection level VDL is obtained based on the average value of the motion vectors of the image (for example, the average value of several to several tens of frame sentences) and is compared with the set level RL. However, the detection level is not limited to this, and the detection level may be a detection level ADL obtained based on the audio level.

FIG. 3 shows a detection level A using an audio level.
10 is a flowchart showing an operation when performing double-speed reproduction when the detection level ADL becomes higher than a set level RL based on the DL.

The detection level ADL obtained from the average value (several seconds to several tens of seconds) of the audio level of the audio information determination section 162 is compared with the set level RL set in the level setting section 163 (step B1). , B2, B3). When the detection level ADL> the set level RL, the double speed reproduction is executed via the reproduction speed control unit 164. During the double speed reproduction period, the detection level ADL is constantly compared with the set level RL.

When the detection level ADL is smaller than the set level RL (ADL <RL), normal reproduction is performed (B4), while when the detection level is opposite (ADL> RL), double-speed reproduction is performed (step B5). ).

During this playback, it is also determined whether or not the playback end time has come (B6). If it is not the end time, the process returns to step B2, and if the end time comes, the playback ends.

Although the audio information determination section 162 detects the audio level, the present invention is not limited to this, and the audio information determination section 162 may be applied to a case where the DC component of the audio frequency is continuous. This is because, in the case where the DC component is continuous, an image having a relatively unchanged image often follows.

In the above embodiment, the comparing section 160 independently compares the set level RL with the detection level VDL that has detected the image motion or the detection level ADL that has been detected from the audio level or detected from the audio frequency. I explained that it will be done. However, the present invention is not limited to this, and a mechanism in which the combination of these detection levels and the set level RL are compared may be used.

FIG. 4 shows various embodiments of the comparison unit 160. FIG. 4A shows that the detection signal VDL obtained from the motion information or the detection signal ADL obtained from the audio information is used as the detection signal adopted by the comparison unit 160 by the switch 3.
This is an example in which selection is made in step 2 and input to the comparator 31 is possible. In this case, the set level RL may be made variable by the operation unit 171.

FIG. 4B shows an example in which both the detection signal VDL obtained from the motion information and the detection signal ADL obtained from the audio information are taken into the comparator 31 via the OR circuit 33. In this case, one of them is set level R
When it exceeds L, double speed reproduction is performed.

FIG. 4C shows a case where both the detection signal VDL obtained from the motion information and the detection signal ADL obtained from the audio information are input to the AND circuit 33, and when both of them exceed the set level at the same time, the double-speed reproduction is performed. Become.

FIG. 5 is a diagram showing an example of the motion information detecting section 161. The video signal is input to the field delay unit 42 via the input unit 41. The video signal one field before and the direct video signal which is the output of the field delay unit 42 are input to the subtractor 43 and pixels before and after the field are subjected to a subtraction process. Thereby, the subtracter 43 outputs
A difference signal corresponding to the image motion is obtained. The difference signal is input to the averaging circuit 44, and the difference signal for several fields or several tens of fields is averaged.

The output of the averaging circuit 44 is
5 is input and divided. Divisors k1, k2, k3
Is switched according to, for example, double speed, and is given when k1 is 1x speed (normal reproduction), k2 is 2x speed, and k3 is 4x speed. k1 <k2 <k3. This is because the video signal supplied to the input unit 41 is thinned out from the original video signal in accordance with the speed, and the value of the motion vector is detected large, so that the detection sensitivity is reduced. Note that a subtractor may be provided instead of the divider 45.

The output of the divider 45 is input to a latch circuit 46, and its value is latched at each detection interval.
Used as the motion information detection level VDL.

FIG. 6 shows various embodiments of the audio information determination unit 162.

FIG. 6A is an example of a circuit for obtaining a detection signal ADL according to the level of an audio signal. An audio signal is supplied to an input unit 51, and the audio signal is input to a detector 52 and subjected to, for example, amplitude detection. This detection output is input to the averaging circuit 53 and averaged for several seconds or tens of seconds. The output of the averaging circuit 53 is input to and divided by a divider 54 whose divisor is switched according to the double speed state. The output of the divider 54 is latched at regular intervals by a latch circuit 55, and the latch output is derived as a detection signal ADL. The divider 54 is provided because the frequency of the audio signal changes according to the double-speed reproduction. Note that a subtractor may be provided instead of the divider 54.

FIG. 6B shows an example in which a low-pass filter (LPF) is provided instead of the detector 52. This example
This is an example devised based on an empirical phenomenon that when the DC component is large, there are many scenes with little motion as an image.
The other parts are the same as in the example of FIG.

FIG. 6C shows still another embodiment. In this example, a plurality of low-pass filters 61, 62, and 63 having low-pass characteristics are provided in parallel on an input unit 51, and the output thereof can be selectively adopted by a switch 64 according to the double speed. is there.

The upper limit pass frequencies f1, 2 for normal reproduction
The relationship between the upper limit pass frequency f2 in the case of double speed and the upper limit pass frequency f3 in the case of triple speed is f1>f2> f3. In this case, the divider 54 may be omitted.

FIG. 7 is a diagram shown to explain the effect of the present invention.

FIG. 7 (O) shows how the level of the detection information changes when one video title is normally reproduced. FIG. 7A shows a case where the setting level of the user is A. Here, the relationship between the levels is A <B <C. In FIG. 7A, since the motion detection level is always higher than the set level, double-speed reproduction is performed, and one title ends in a short time. FIG. 6B shows a case where the user setting level is B. In this case, at the motion detection level A, normal reproduction is performed, and the motion detection levels B, C
During the period, the double speed reproduction is performed. FIG. 9C shows a case where the user setting level is C. In this case, normal reproduction is performed at the motion detection levels A and B, and double-speed reproduction is performed during the period of the motion detection level C.

As described above, according to the present invention, when an image is to be skipped and reproduced, it is automatically transferred to normal reproduction in an important moving scene or in a section where the sound level is sufficient and important, and Double-speed playback can be performed in scenes without sound or in scenes without sound.

[0047]

As described above, according to the present invention, the reproduction speed can be varied by intelligently recognizing the reproduction speed according to the content of the video or the content of the audio information.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart shown to explain an operation example of the first embodiment of the apparatus of the present invention;

FIG. 3 is a flowchart for explaining an operation example of the second embodiment of the apparatus of the present invention;

FIG. 4 is a diagram showing various examples of a comparison unit in FIG. 1;

FIG. 5 is a diagram showing various embodiments of a motion information detection unit in FIG. 1;

FIG. 6 is a diagram showing various embodiments of the audio information detection unit in FIG. 1;

FIG. 7 is an explanatory diagram for explaining the effect of the device of the present invention.

[Explanation of symbols]

10: disk, 12: disk drive device, 13:
Data processing unit, 14 decoder unit, 15 AV output unit,
16: Main MPU section, 17: Input section, 160: Comparison section, 161: Motion information detection section, 162: Voice information determination section.

Claims (6)

[Claims] 1. A reproducing apparatus capable of double-speed reproduction, comprising: a motion detecting means for detecting motion information of an image using a video signal reproduced from a recording medium; and a user detecting the motion information detected by the motion detecting means. A disk variable speed playback device comprising: a comparison unit that compares the level with a set level; and a speed variable unit that changes a playback speed based on comparison information obtained from the comparison unit. 2. A reproducing apparatus capable of performing double-speed reproduction, comprising: level detecting means for detecting an audio level using an audio signal reproduced from a recording medium; and detecting a detection signal from the detecting means with a level set by a user. A disk variable speed reproducing apparatus comprising: comparing means for comparing; and variable speed means for changing a reproducing speed based on the comparison information obtained from the comparing means. 3. A reproducing apparatus capable of double-speed reproduction, wherein: a detecting means for detecting a level of a signal having a frequency equal to or lower than a specific frequency of an audio signal reproduced from a recording medium; and a detection level from the detecting means set by a user. A disc variable speed reproducing apparatus comprising: a comparing means for comparing with a level; and a speed varying means for changing a reproducing speed based on comparison information obtained from the comparing means. 4. A reproducing apparatus capable of double-speed reproduction, comprising: a motion detecting means for detecting motion information of an image using a video signal reproduced from a recording medium; and a user detecting the motion information detected by the motion detecting means. First comparing means for comparing with a set level; level detecting means for detecting an audio level using an audio signal reproduced from the recording medium; and a level set by a user for a detection signal from the level detecting means. A variable speed reproducing device for changing a reproducing speed based on the comparison information obtained from the first and / or second comparing device. . 5. The motion detection means according to claim 1, wherein the detection sensitivity is controlled in accordance with a reproduction speed.
Or the disk variable speed playback device according to 3 or 4. 6. The disk variable speed reproducing apparatus according to claim 1, wherein the level detecting means controls the detection sensitivity according to a reproducing speed.