KR100245146B1 - Apparatus for video disc - Google Patents

Abstract

The video disc decoder includes a decoding section for decoding the first picture data read from the video disc into second picture data. The PAL encoder operates to encode the second picture data generated by the decoding means into a PAL video signal. The converting unit converts the PAL video signal to a video signal of another format by operating the PAL video signal generated by the PAL encoder to remove a horizontal scan line in the raster area and convert the vertical synchronization frequency. The input acts to point to the delineated part of the raster in response to the user's request. The control unit operates to control the conversion unit to move the position of the line deleted portion in response to the conversion of the user's request.

Description

Equipment for video discs

1 is a block diagram of a playback apparatus according to a first embodiment of the present invention.

2 is a block diagram of the NTSC / PAL encoder of FIG.

3 is a flowchart of a segment of the CPU control program of FIG.

4 is a diagram showing a first condition of a raster area in which horizontal scanning lines have been removed and a raster area in which horizontal scanning lines are not removed.

5 is a diagram showing a second condition of a raster region in which the horizontal scanning line has been removed and a raster region in which the horizontal scanning line is not removed.

FIG. 6 is a diagram showing third conditions of the raster area from which the horizontal scan line has been removed and the raster area from which the horizontal scan line has not been removed.

7 is a block diagram of a part of a playback apparatus according to a second embodiment of the present invention.

8 is a block diagram of the NTSC / PAL encoder of FIG.

9 is a flowchart of a segment of the CPU control program of FIG.

* Explanation of symbols for main parts of the drawings

1: CD player 2: drive amplifier

2A: Spindle Motor 2B: Optical Pickup Head

2C: actuator for optical pickup head 3: CPU

4: Command input unit 5: CD decoder / servo circuit

5A: RF unit 70: signal processing and video playback unit

80: audio processing circuit

[Purpose of invention]

[Technical field to which the invention belongs and the prior art in that field]

[Background of invention]

[Field of Invention]

The present invention relates generally to a device for a video disc, such as a compact disc (CD) or a digital video disc (DVD). The present invention relates in particular to an apparatus for decoding compressed picture data read from a video disc and a reproduction apparatus for reproducing information from a video disc.

[Description of the Prior Art]

The video CD of the first type stores an image signal of an NTSC system. The video CD of the second type stores the picture signal of the PAL system. Since NTSC systems and PAL systems are not compatible with each other, there are NTSC video CD players and PAL video CD players.

Advanced video CD players can handle both NTSC video CDs and PAL video CDs. Advanced Video CD players have the ability to convert PAL picture signals to NTSC picture signals. The number of horizontal scan lines in the PAL system constituting the raster is larger than the number of horizontal scan lines in the NTSC system. During conversion of the PAL picture signal to an NTSC picture signal, the enhanced video CD player deletes a portion of the PAL picture signal corresponding to a predetermined horizontal scan line extending in the selected area of the PAL raster. Therefore, the display information in the selected area of the PAL raster is deleted every frame. The selected area is fixed for all frames. Since the selected area of the PAL raster is fixed as described above, an improved Video CD player has the following problem. In some cases, the selected area of the PAL raster corresponds to display information that is important to the user. Since the selected area of the PAL raster is fixed, important display information is inevitably deleted and therefore not available to the user.

[Technical problem to be achieved]

[Summary of invention]

It is an object of the present invention to provide an apparatus for an improved video disc.

Decoding means for decoding the first picture data read from the video disc into second picture data, and a PAL encoder for encoding the second picture data generated by the decoding means into a PAL video signal, and generated by the PAL encoder. Converting the PAL video signal to a horizontal scanning frequency in the region of the raster and converting the horizontal synchronization frequency, and thus converting means for converting the PAL video signal into a video signal of another format, and raster in response to a user's request A video disc decoder comprising an input unit for indicating the position of the line erased region of the control unit and a control means connected to the input unit for controlling the converting means to move the position of the line deleted region in response to a user request. It is a first aspect of the present invention.

A second aspect of the present invention is based on the first aspect of the present invention and an NTSC encoder for encoding second picture data generated by decoding means into an NTSC video signal, and first picture data read from a video disc. Determining means for determining whether the PAL system corresponds to the NTSC system and providing the second image data to the PAL encoder when the determining means determines that the first image data corresponds to the PAL system, And a switching means connected to the determining means for providing second image data to the NTSC encoder when the determining means determines that the data corresponds to an NTSC system.

According to a third aspect of the present invention, there is provided a driving apparatus for driving a video disk, reading means for reading first image data from the video disk, and second image data for the first image data read from the video disk. Decoding means for decoding the video signal, a PAL encoder for encoding the second image data generated by the decoding means into a PAL video signal, and a horizontal scanning line in the region of the raster for the PAL video signal generated by the PAL encoder. And a converting means for converting the PAL video signal into a video signal of another format, an input unit for indicating the position of the line erased area of the raster in response to a user's request. The converting means moves the position of the line erased area in response to the change of the user's request. A disk reproducing apparatus is provided which includes a converting means and a control means connected to an input unit for locking control.

A fourth aspect of the present invention is based on the third aspect of the present invention and includes an NTSC encoder for encoding second image data generated by decoding means into an NTSC video signal, and a first picture read from a video disc. Determining means for determining whether the data correspond to the PAL system or the NTSC system, and providing the second image data to the PAL encoder when the determining means determines that the first image data corresponds to the PAL system, And a switching means connected to the determining means for providing the second image data to the NTSC encoder when the determining means determines that the picture data of the image corresponds to the NTSC system.

A fifth aspect of the present invention provides a first aspect for deleting horizontal scan lines and changing vertical sync frequencies in an area of a raster for decoding first picture data of a PAL system read from a video disc into second picture data. Decoding means operative to process the image data of an imager, an NTSC encoder for encoding the second image data generated by the decoding means into an NTSC video signal, and the position of the line erased area of the raster in response to a user's request And a decoding means for controlling the decoding means to move the position of the line erased region in response to a change in the user's request, and a control means connected to the input portion.

A sixth aspect of the present invention provides a driving apparatus for driving a video disk, reading means for reading first image data of the PAL system from the video disk, and second first image data read from the video disk. Decoding means operative to process the first image data to delete the horizontal scanning line in the region of the raster and to change the vertical synchronizing frequency for decoding into the image data of the second image; and a second image generated by the decoding means. An NTSC encoder for encoding data into an NTSC video signal, an input for indicating the position of the line erased area of the raster in response to the user and the request, and an area where the decoding means is line erased in response to a change in the user's request A disk comprising a converting means and a control means connected to the input for controlling movement of the position of To provide a raw device.

A seventh aspect of the invention processes first means for reading video information of a first format from a video disc and processes video information of the first format to delete horizontal scanning lines in the region of the raster, and therefore Second means for converting video information of a first format into video information of a second format different from the first format, and a second means for moving the line erased region associated with the raster in response to a user's request. It is to provide a device for a video disc comprising the means of three.

[Configuration and Function of Invention]

Detailed description of the preferred embodiments

[Example of FIG. 1]

Regarding FIG. 1, the reproducing apparatus includes a CD player 1 having a spindle motor 2A, an optical pickup head 2B, an actuator 2C for the optical pickup head, and a drive amplifier 2 . The spindle motor 2A rotates the spindle 10. The video CD placed in the CD player 1 rotates as the spindle 10 rotates. In general, the video CD rotates at a constant linear velocity (CLV) while being driven. The drive amplifier 2 is electrically connected to the spindle motor 2A, the optical pickup head 2B, and the head actuator 2C.

The CD player 1 also includes a CPU 3, a command input section 4, an indicator 4A, a CD decoder / servo control circuit 5, and an RF section 5A. The RF section 5A is electrically connected between the optical pickup head 2B and the CD decoder / servo control circuit 5. The CD decoder / servo control circuit 5 is electrically connected to the drive amplifier 2 and the CPU 3. The CPU 3 is electrically connected to the command input unit 4 and the indicator 4A.

It should be noted that the CD player 1 can be replaced with a DVD player. In this case, the DVD is used instead of the video CD.

The operation of the playback device of FIG. 1 is changeable between different modes such as "play", "stop", "search", and "pause". Also, the operation of the playback device in FIG. 1 can be changed between the first predetermined mode, the second predetermined mode, and the third predetermined mode. During the first predetermined mode of operation, the playback device in FIG. 1 reads information from the PAL video CD and outputs it as a video signal in the read information PAL format. During the predetermined second mode of operation, the playback device in FIG. 1 reads information from the PAL video CD, changes the read information into a video signal in NTSC format, and outputs an NTSC video signal. During the third predetermined mode of operation, the playback device in FIG. 1 reads information from an NTSC video CD, and outputs the read information as a video signal in NTSC format.

The tone input section 4 has a key indicating each of the different modes of operation of the playback device. The command input section 4 also has a key indicating a horizontal scanning line to be deleted. The key of the command input unit 4 can be operated by the user.

The reproducing apparatus of FIG. 1 also includes a signal processing and video reproducing section 70 and an audio signal processing circuit 80. The signal processing and video reproducing section 70 is connected to the CD decoder / servo control circuit 5 and the CPU 3. The audio signal processing circuit 80 is connected to the CD decoder / servo control circuit 5 and the signal processing and video reproduction unit 70.

The signal processing and video reproduction unit 70 includes a CPU 30, an SRAM 32, a DRAM 34, a ROM 36, an MPEG decoder 75, a video signal processing circuit 76, an NTSC / PAL encoder 78 ), And crystal resonators 74, 77, 79. The CPU 30 is connected to the CPU 3, the CD decoder / servo control circuit 5, the SRAM 32, and the MPEG decoder 75. The DRAM 34 and the ROM 36 are connected to the MPEG decoder 75. The video signal processing circuit 76 is connected between the MPEG decoder 75 and the NTSC / PAL encoder 78. The NTSC / PAL encoder 78 is connected to the CPU 30. The crystal resonator 74 is connected to the MPEG decoder 75 to generate a fixed frequency clock signal at the MPEG decoder 75. The crystal resonator 77 is connected to the video signal processing circuit 76 to generate a fixed frequency clock signal at the video signal processing circuit 76. The crystal resonator 79 is coupled to the NTSC / PAL encoder 78 to generate a fixed frequency clock signal at the NTSC / PAL encoder 78. The MPEG decoder 75 is connected to a CD decoder / servo control circuit 5 and an audio signal processing circuit 80. The video signal processing circuit 76 includes an interface, a D / A converter, and a synchronization signal generator.

The audio signal processing circuit 80 is connected to the CD decoder / servo control circuit 5 and the MPEG decoder 75. The audio signal processing circuit 80 includes a digital filter and a D / A converter.

A signal having compressed video information and audio information is reproduced by the optical pickup head 2B from the video CD. The reproduced signal is transmitted from the optical pickup head 2B to the CD decoder / servo control circuit 5 via the RF section. The reproduced signal is subjected to a CD decoding process which is inverse with respect to the CD encoding process by the CD decoder / servo control circuit 5. The resulting reproduced signal is provided from the CD decoder / servo control circuit 5 to the MPEG decoder 75 and subjected to the MPEG decoding process opposite to the MPEG encoding process by the MPEG decoder 75. The MBEG decoding process restores original video information and original audio information from the reproduced signal provided to the MPEG decoder 75. The reconstructed video information is transmitted from the MPEG decoder 75 to the NTSC / PAL encoder 78 through the video signal processing circuit 76. The video information is encoded by NTSC / PAL encoder 78 into a video signal in NTSC format or PAL format. The NTSC format or PAL format video signal is transmitted from the NTSC / PAL encoder 78 to an external device (not shown) as an output signal from the playback device in FIG. The recovered audio information is transmitted from the MPEG decoder 75 to the audio signal processing circuit 80. The audio information is converted and separated into a left channel audio signal and a right channel audio signal by the audio signal processing circuit 80. The left channel audio signal and the right channel audio signal are transmitted from the audio signal processing circuit 80 to an external device (not shown) as an output signal from the reproduction device of FIG.

The CPU 3 has a pair of input / output ports, a processing unit 3, a ROM, and a RAM. The CPU 3 operates according to the control program stored in the internal ROM. Similarly, the CPU 30 has a pair of input / output ports, a processing unit, a ROM, and a RAM. The CPU 30 operates in accordance with a control program stored in an internal ROM.

As mentioned above, the operation of the playback apparatus of FIG. 1 can be changed among different modes including "playback", "stop", "search", and "pause", and the first predetermined mode and And a second predetermined mode, and a third predetermined mode. The command input section 4 has keys for indicating different modes of each of the playback device operations. The CPU 3 reads the operation mode information generated by the command input section 4 in response to the operation of the key in the command input section 4. The CPU 3 generates a control signal in response to the operation mode information, and outputs the generated control signal to the CD decoder / servo control circuit 5. The CD decoder / servo control circuit 5 adjusts the head actuator 2C through the drive amplifier 2 in response to a control signal from the CPU 3, thereby relating to the video CD of the CD player 1. Thus, servo control of the optical pickup head 2B is implemented. The CPU 3 transmits operation mode information to the CPU 30.

As described above, the command input section 4 also has a key indicating the horizontal scanning line to be deleted. The information of the horizontal scanning line to be deleted (that is, the horizontal scanning line indicated) is transmitted from the command input section 4 to the CPU 30 through the CPU 3. As shown in FIG. 2, NTSC / PAL encoder 78 includes PAL encoder 82, NTSC encoder 84, PAL-NTSC converter 86, D / A converter 88, and switch SW1, SW2). The input side of the switch SW1 is subject to the video information output from the video signal processing circuit 76 (see FIG. 1). The switch SW1 has two outputs, each followed by a PAL encoder 82 and an NTSC encoder 84. The switch SW1 can be changed between the position "a" and the position "b". When the switch SW1 is in position "a", the video information is transmitted from the switch SW1 to the PAL encoder. When the switch is in position “b”, the video information is sent from the switch SW1 to NTSC encoder 84. The switch SW1 is controlled by the signal output from the CPU 30 (see FIG. 1).

The PAL encoder 82 converts the video information, which is a digital non-interlace signal, into a digital interlaced signal in PAL format. Thus, the device 82 encodes the video information into a digital video signal in PAL format. The NTSC encoder 84 converts the video information, which is a digital interlaced signal, into a digital interlaced signal in NTSC format. Thus, the device 84 encodes the video information into a digital video signal in NTSC format.

PAL-NTSC converter 86 follows PAL encoder 82. PAL-NTSC converter 86 receives a digital PAL video signal from PAL encoder 82. The PAL-NTSC converter 86 is notified by the CPU 30 of the horizontal scan line to be deleted (ie, the horizontal scan line indicated). The PAL-NTSC converter 86 converts the digital PAL video signal into a digital NTSC video signal while deleting or discarding a portion of the digital PAL video signal corresponding to the indicated horizontal scan line (ie, the horizontal scan line to be deleted). While converting the digital PAL video signal to a digital NTSC video signal, the PAL-NTSC converter 86 reduces the number of horizontal scan lines from 288 to 240 per field. In addition, the PAL-NTSC converter 86 increases the frequency (vertical frequency) of the vertical synchronization signal from 50 Hz to 60 Hz. As a special way of increasing the frequency of the vertical synchronization signal, each of the several fields represented by the PAL video signal is used as two fields related to the digital NTSC video signal.

The switch SW2 has three input sides, each of which follows a PAL encoder 82, an NTSC encoder 84, and a PAL-NTSC converter 86. Thus, the switch SW2 receives the digital PAL video signal from the PAL encoder 82. The switch SW2 receives a digital NTSC video signal at the NTSC encoder 84. The switch SW2 receives a digital NTSC video signal at the PAL-NTSC converter 86. A D / A converter 88 follows the output of the switch SW2. The switch SW2 is one of a digital PAL video signal output from the PAL encoder 82, a digital NTSC video signal output from the NTSC encoder 84, and a digital NTSC video signal derived from the PAL-NTSC converter 86. Select. The switch SW2 sends the selected digital video signal to the B / A converter 88. The switch SW2 may vary between position "a1", position "a2", and position "b". When the switch SW2 is in position "a1", the digital NTSC video signal is transmitted from the PAL-NTSC converter 86 to the D / A converter 88 via the switch SW2. When the switch SW2 is in position "a2", the digital PAL video signal is transmitted from the PAL encoder 82 to the D / A converter 88 via the switch SW2. When switch SW2 is in position “b”, the digital NTSC video signal is transmitted from NTSC encoder 84 to D / A converter 88 via switch SW2. The switch SW2 is controlled by the signal output from the CPU 30 (see FIG. 1).

The D / A converter 88 receives a digital video signal from the switch SW2. The D / A converter 88 converts the digital video signal into a corresponding analog video signal. The analog video signal is transmitted from the D / A converter 88 to an external device (not shown) as an output signal from the playback device in FIG.

3 is a flowchart of a segment of the control program for the CPU 30. As also shown in FIG. 3, the first step S1 of the program segment initializes the variable. Step S1 A subsequent step S2 fetches operation mode information and deleted line information from the command input unit 4 via the CPU 3. Further, step S2 receives an output signal of the MPEG decoder 75 representing the head information read from the video CD placed in the CD player 1.

Step S2 is followed by step S3 in response to the header information provided by step S2 whether the information read from the video CD corresponds to a PAL system or an NTSC system (i.e., the video CD is PAL). Determines whether it is a Video CD or an NTSC Video CD. When it is found that the information read from the video CD corresponds to the NTSC system, the program proceeds from step S3 to step S4. When it is found that the information read from the video CD corresponds to the PAL system, the program proceeds from step S3 to step S5.

Step S4 controls the switches SW1 and SW2 in the NTSC / PAL encoder 78. In particular, step S4 sets the switches SW1 and SW2 to the position "b". As a result, the output signal of the video signal processing circuit 76 is provided to the NTSC encoder 84 via the switch SW1. The output signal of the video signal processing circuit 76 is converted by the NTSC encoder 84 into a digital NTSC video signal. The digital NTSC video signal is transmitted from the NTSC encoder 84 to the D / A converter 88 via a switch SW2. The digital NTSC video signal is converted by the D / A converter 88 into a corresponding analog NTSC video signal. In this manner, the third predetermined mode of operation of the playback device in FIG. 1 is implemented. Thus, the playback apparatus in FIG. 1 reads information from an NTSC video CD and outputs the read information as a video signal in NTSC format. After step S4, the current execution cycle of the program segment ends.

Step S5 determines which of the first and second predetermined operation modes is indicated corresponding to the operation mode information fetched by step S2. When the second predetermined mode of operation appears to be pointed out, the program proceeds from step S5 to step S6. When the first predetermined mode of operation appears to be pointed out, the program proceeds from step S5 to step S7.

The step S6 controls the switches SW1 and SW2 in the NTSC / PAL encoder 78. In particular, step S6 sets the switch SW1 to the position "a". In addition, step S6 sets the switch SW2 to the position "a1". As a result, the output signal of the video signal processing circuit 76 is provided to the PAL encoder 82 via the switch SW1. The output signal of the video signal processing circuit 76 is converted into a digital PAL video signal by the PAL encoder 82. The digital PAL video signal is sent from the PAL encoder 82 to the PAL-NTSC converter 86. Step S6 outputs the deleted line information to the PAL-NTSC converter 86. PAL-NTSC converter 86 discards the digital PAL video signal while deleting or discarding a portion of the digital PAL video signal corresponding to the indicated horizontal scan line (i.e., the horizontal scan line to be deleted) indicated by the deleted line information. Convert to digital NTSC video signal. While converting the digital PAL video signal to a digital NTSC video signal, the PAL-NTSC converter 86 increases the frequency of the vertical sync signal from 50 Hz to 60 Hz. The digital NTSC video signal is transmitted from the PAL-NTSC converter 86 to the D / A converter 88 via a switch SW2. The digital NTSC video signal is converted by the D / A converter 88 into a corresponding analog NTSC video signal. In this manner, the second predetermined mode of operation of the reproduction device of FIG. 1 is implemented. Accordingly, the playback apparatus in FIG. 1 reads information from the PAL video CD, converts the read information into a video signal in NTSC format, and outputs an NTSC video signal. After step S6, the current execution cycle of the program segment ends.

Step S7 controls the switches SW1 and SW2 in the NTSC / PAL encoder 78. In particular, step S7 sets the switch SW1 to the position "a". In addition, step S7 sets the switch SW2 to the position "a2". As a result, the output signal of the video signal processing circuit 76 is provided to the PAL encoder 82 via the switch SW1. The output signal of the video signal processing circuit 76 is converted into a digital PAL video signal by the PAL encoder 82. The digital PAL video signal is transmitted from the PAL encoder 82 to the PAL-NTSC converter 86 via a switch SW2. The digital NTSC video signal is converted by the D / A converter 88 into a corresponding analog PAL video signal. In this manner, the first predetermined mode of operation of the playback equipment in FIG. 1 is implemented. Thus, the playback device in FIG. 1 reads information from the PAL video CD and outputs the read information as a PAL format video signal. . After step S7, the current execution cycle of the program segment ends.

As described above, during the second predetermined operation mode of the reproduction device of FIG. 1, the digital PAL video signal corresponding to the indicated horizontal scanning line (i.e., the horizontal scanning line to be deleted) indicated by the deleted line information. Part of is deleted or discarded. The deleted horizontal scan line extends to the area of the PAL raster that is movable in response to the deleted line information. In particular, the area of the PAL raster occupied by the deleted horizontal scanning line is moved by operating the associated key in the command input section 4 which changes the content of the deleted line information. Under the first condition, the horizontal scan line of the upper region of the PAL raster is deleted as shown in FIG. Under the second condition, the horizontal scan lines of the upper and lower regions of the PAL raster are deleted as shown in FIG. In such a case, the number of deleted horizontal scan lines in the upper region will increase by decreasing the number of deleted horizontal scan lines in the lower region. This change in the number of deleted scan lines in the upper and lower regions can be implemented by using a variable register operated by hand in the command input section 4. Under the third condition, the horizontal scan line of the lower region of the PAL raster is deleted as shown in FIG.

As described above, the area of the PAL raster occupied by the deleted horizontal scanning line is moved by operating the associated key in the command input section 4 which changes the contents of the deleted line information. In the case where the output video signal of the reproduction device of FIG. 1 is indicated by the display (not shown), the image on the display screen is scrolled when the deleted line information changes.

It should be noted that the first predetermined mode of operation of the playback apparatus of FIG. 1 can be omitted. In this case, the position "a2" of the switch SW2 becomes unnecessary.

It should be noted that the third predetermined mode of operation of the playback device in FIG. 1 can be omitted. In this case, NTSC encoder 84 becomes unnecessary.

It should be noted that the D / A converter 88 may be moved to the video signal processing circuit 76. In this case, the NTSC / PAL encoder 78 is modified to analog type.

Second Embodiment

7 shows a part of a playback apparatus according to the second embodiment of the present invention. The playback apparatus in FIG. 7 is similar to the playback apparatus in FIG. 1 except for the design change pointed out below. The playback device in FIG. 7 replaces the CPU 30A, MPEG decoder 75A, and NTSC / PAL encoder 78A in place of the CPU 30, MPEG decoder 75, and NTSC / PAL encoder 79 of the playback device in FIG. ).

The MPEG decoder 75A is controlled by the CPU 30A to implement a decrease in the number of horizontal scan lines and an increase in the vertical frequency in conjunction with converting the reproduced PAL video information into NTSC video information. The CPU 30A informs the MPEG decoder 75A of the start horizontal scan line and the end horizontal scan line, and the portion of the image to be displayed is located between the start and end of the horizontal scan line. The MPEG decoder 75A uses the information of the start line and the end line to implement a reduction in the number of horizontal scan lines. The CPU 30A receives the line information deleted from the type input unit 4 via the CPU 3. When the operation mode information transmitted from the command input unit 4 to the CPU 30A via the CPU 3 includes a request for a change of the digital PAL video signal into a digital NTSC video signal, the CPU 30A is deleted. The start line and the end line are determined corresponding to the line information. The CPU 30A then informs the MPEG decoder 75A of the determined start line and the determined end line.

As shown in FIG. 8, NTSC / PAL encoder 78A includes PAL encoder 82, NTSC encoder 84, D / A converter 88, and switches SW3 and SW4. The input side of the switch SW3 depends on the video information output from the video signal processing circuit 76 (see Fig. 7). The switch SW3 has two output sides followed by a PAL encoder 82 and an NTSC encoder 84, respectively. The switch SW3 can be changed between the position "a" and the position "b". When switch SW3 is in position "a", the video information is sent from switch SW3 to PAL encoder 82. When the switch SW3 is in position "b", the video information is transmitted from the switch SW3 to the NTSC encoder 84. The switch SW3 is controlled by the signal output from the CPU 30A (see Fig. 7).

The PAL encoder 82 converts video information that is a digital interlaced signal into a digital interlaced signal in PAL format. Thus, the device 82 converts the video information into a digital video signal in PAL format. NTSC encoder 84 converts video information that is a digital interlaced signal into a digital interlaced signal in NTSC format. That is, the device 84 converts the video information into a digital video signal in NTSC format.

The switch SW4 has two input sides followed by a PAL encoder 82 and an NTSC encoder 84, respectively. That is, the switch SW4 receives the digital PAL video signal from the PAL encoder 82. The switch SW4 receives the digital NTSC video signal from the NTSC encoder 84. The output side of the switch SW4 is followed by the D / A converter 88. The switch SW4 selects one of the digital PAL video signal output from the PAL encoder 82 and the digital NTSC video signal output from the NTSC encoder 84. The switch SW4 sends the selected digital video signal to the D / A converter. The switch SW4 can vary between position "a" and position "b". When the switch SW4 takes the position "a", the digital PAL video signal is transmitted from the PAL encoder 82 to the D / A converter 88 via the switch SW4. When switch SW4 takes position " b ", the digital NTSC video signal is transmitted from NTSC encoder 84 to D / A converter 88 via switch SW4. The switch SW4 is controlled by the signal output from the CPU 30A (see Fig. 7).

The D / A converter 88 receives the digital video signal from the switch SW4. The D / A converter 88 converts the digital video signal into a corresponding analog video signal. The analog video signal is transmitted from the D / A converter 88 to an external device (not shown) as an output video signal from the playback device in FIG.

9 is a segment flowchart of a control program for the CPU 30A. As shown in FIG. 9, the first step S1 of the program segment initializes the variable. Step S1 A subsequent step S2 fetches operation mode information and deleted line information from the command input unit 4 via the CPU 3. In addition, step S2 receives an output signal of the MPEG decoder 75A representing the head information read from the video CD located in the CD player 1 (see FIG. 1).

Step S2 is followed by step S3 in which the information read from the video CD corresponding to the head information provided by step S2 corresponds to a PAL system or an NTSC system (that is, the video CD is a PAL video CD). Or NTSC Video CD). When the information read from the video CD appears to correspond to the NTSC system, the program proceeds from step S3 to step S8. When the information read from the video CD appears to correspond to the PAL system, the program proceeds from step S3 to step S5.

Step S8 controls the switches SW3 and SW4 in the NTSC / PAL encoder 78A. In particular, step S8 sets the positions of the switches SW3 and SW4 to "b". As a result, the output signal of the video signal processing circuit 76 is provided to the NTSC encoder 84 via the switch SW3. The output signal of the video signal processing circuit 76 is converted by the NTSC encoder 84 into a digital NTSC video signal. The digital NTSC video signal is transmitted from switch NTSC encoder 84 to D / A converter 88 via switch SW4. The digital video signal is converted by the D / A converter 88 into a corresponding analog NTSC video signal. In this manner, the third predetermined mode of operation of the playback apparatus of FIG. 7 is implemented. Thus, the playback apparatus in FIG. 7 reads information from the NTSC video CD, and outputs the read information as a video signal in NTSC format. After step S8, the current execution cycle of the program segment ends.

Step S5 determines which of the first predetermined operation mode and the second predetermined operation mode appears in correspondence with the operation mode information fetched by step S2. When it is found that the second predetermined mode of operation is shown, the program proceeds from step S5 to step S9. When it is found that the first predetermined mode of operation is shown, the program proceeds from step S5 to step S11.

Step S9 determines the start line and the end line corresponding to the deleted line information. The next step S9 informs the MPEG decoder 75A of the determined start line and end line. In this case, the MPEG decoder 75A outputs a segment of the sequentially recovered video information corresponding to the continuous horizontal scanning line between the determined start line and the end line to the video signal processing circuit 76. Thus, the MPEG decoder 75A reduces the number of horizontal scan lines. In addition, the MPEG decoder 75A realizes an increase in the vertical frequency. These processes realized by the MPEG decoder 75A correspond to conversion of PAL video information into NTSC video information.

Step S9 The next step S10 controls the switches SW3 and SW4 in the NTSC / PAL encoder 78A. In particular, step S10 sets the position of the switch SW3 to "b". In addition, step S10 sets the position of the switch SW4 to "b". As a result, the output signal of the video signal processing circuit 76 is provided to the NTSC encoder 84 via the switch SW3. The output signal of the video signal processing circuit 76 is converted by the NTSC encoder 84 into a digital NTSC non-ideal signal. The digital NTSC video signal is transmitted from the NTSC encoder 84 to the D / A converter 88 via a switch SW4. The digital NTSC video signal is converted by the D / A converter 88 into a corresponding analog NTSC video signal. In this way, the second predetermined mode of operation of the playback apparatus of FIG. 7 is implemented. Thus, the playback apparatus of FIG. 7 reads information from the PAL video CD, converts the read information into a video signal in NTSC format, and outputs an NTSC video signal. After step S10, the current execution cycle of the program segment ends.

Step S11 controls the switches SW3 and SW4 in the NTSC / PAL encoder 78A. In particular, step S11 sets the position of the switch SW3 to "a". In addition, step S11 sets the position of the switch SW4 to "a". As a result, the output signal of the video signal processing circuit 76 is provided to the PAL encoder 82 via the switch SW3. The output signal of the video signal processing circuit 76 is converted into a digital PAL video signal by the PAL encoder 82. The digital PAL video signal is transmitted from the PAL encoder S2 to the D / A converter 88 via a switch SW4. The digital PAL video signal is converted by the D / A converter 88 into a corresponding analog PAL video signal. In this way, the first predetermined mode of operation of the playback device in FIG. 7 is implemented. Thus, the playback apparatus in FIG. 7 reads information from the PAL video CD and outputs the read information as a video signal in the PAL format. After step S11, the current execution cycle of the program segment ends.

It should be noted that the first predetermined operation mode of the playback apparatus in FIG. 7 may be omitted. In this case, the PAL encoder 82 and the switches SW3 and SW4 are unnecessary.

It should be noted that the third predetermined mode of operation of the playback device in FIG. 1 may be omitted.

Note that the D / A converter 88 may be moved to the video signal processing circuit 76. In this case, the NTSC / PAL encoder 78A is modified to an analog type.

Claims (7)

Decoding means for decoding the first picture data read out from the video disc into second picture data, a PAL encoder to encode the second picture data generated by the decoding means into a PAL video signal, and a raster ( conversion means for processing the PAL video signal generated by the PAL encoder to remove the horizontal scanning line in the region of the raster and to change the vertical tuning frequency, thereby converting the PAL video signal into a video signal of another format; A control unit connected to the conversion means and the input unit for controlling the input unit for indicating the position of the line deleted region in response to the user's request, and the converting means to move the position of the line deleted region in response to the user's request change Means comprising a video disc decoder. The NTSC encoder according to claim 1, wherein the NTSC encoder for encoding the second picture data generated by the decoding means into an NTSC video signal, and the first picture data read from the video disc correspond to the PAL system or the NTSC system. Determining means for determining whether the first picture data corresponds to the PAL system, and providing the second picture data to the PAL encoder when the determining means determines that the first picture data corresponds to the PAL system, and determining means that the first picture data corresponds to the NTSC system. And switching means coupled to the determining means for providing the second picture data to the NTSC encoder in the determination. Drive means for driving a video disc, reading means for reading first image data from the video disc, decoding means for decoding the first image data read from the video disc into second image data; A PAL encoder for encoding the second picture data generated by the decoding means into a PAL video signal, and processing the PAL video signal generated by the PAL encoder to delete the horizontal scanning line in the area of the raster and to change the vertical tuning frequency And conversion means for converting the PAL video signal into a video signal of another format, an input portion for indicating the line erased area of the raster in response to a user's request, and a line deleted in response to the user's request change. Connected to the conversion means and the input to control the conversion means to move the position of the area Disk reproducing apparatus comprising a control means. 4. The NTSC encoder according to claim 3, wherein the NTSC encoder for encoding the second picture data generated by the decoding means into an NTSC video signal, and the first picture data read from the video disc correspond to the PAL system or the NTSC system. Determining means for determining whether the first picture data corresponds to the PAL system, and providing the second picture data to the PAL encoder when the determining means determines that the first picture data corresponds to the PAL system, and determining means that the first picture data corresponds to the NTSC system. And switching means connected to the determining means for providing the second picture data to the NTSC encoder at the time of determination. To decode the first picture data of the PAL system read from the video disc into the second picture data, to delete the horizontal scan line in the area of the raster and to process the first picture line to change the vertical tuning frequency. Decoding means, an NTSC encoder for encoding the second image data generated by the decoding means into an NTSC video signal, an input portion for indicating the position of the line erased area of the raster in response to a user's request, and a user And control means coupled to the input means for controlling the decoding means to move the position of the line erased region in response to a required change of the. Drive means for driving the video disc, reading means for reading the first image data of the PAL system from the video disc, and first image data read from the video disc into second image data, Decoding means operative to process the first image data to delete the horizontal scan line and convert the vertical tuning frequency in s, an NTSC encoder for encoding the second image data generated by the decoding means into an NTSC video signal; Control means connected to the decoding means and the input portion for controlling the input portion for indicating the line erased region of the raster in response to the user's request, and the decoding means for controlling the position of the line erased region in response to the user's request change. Disc playback apparatus comprising a. First means for reading video information of the first format from the video disc, and processing the video information of the first format to delete the horizontal scanning line in the region of the raster, and thus video information of the first format Second means for converting the information into video information of a second format different from the first format, and third means for moving the line erased region associated with the raster in response to a user's request. Device for video discs.