JPS647512Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a disc player used to play back a disc on which program information is recorded, such as a digital audio disc. The present invention relates to a program selection device capable of accurately and quickly selecting a desired piece of program information from among pieces of program information.

The digitized audio signal is recorded as program information on a rotating disk-shaped recording medium to form a digital audio disk, and the recorded digital audio disk is applied to a disk player to obtain a reproduced audio signal. A digital audio disk system has been proposed as a system that can relatively easily obtain high-quality reproduced audio signals. Program information recorded on such digital audio disks is usually accompanied by address data, and when played back on a disk player, based on this address data,
It is possible to selectively reproduce desired pieces of recorded program information.

A disk on which address data is recorded along with program information, such as such a digital audio disk, is formed as shown in FIG. 1, for example. In FIG. 1, reference numeral 1 denotes a disc main body, which has a through hole 2 in the center for engaging a rotating part of the disc player when it is mounted on the disc player. A recording section 3 is placed around this through hole 2.
is formed in a ring shape. The recording section 3 has a through hole 2.
A narrow pitch spiral recording track is formed surrounding the recording track, and a plurality of program information and accompanying address data are stored on this recording track, for example.
The information is recorded to be reproduced from the inner circumferential side of the recording section 3, that is, the through-hole 2 side, toward the outer circumferential side, that is, toward the outer circumferential edge of the disk 1. In that case, for example,
For each program information recorded, 1, 2, 3,
. . . Addresses are assigned sequentially as m-1, m, m+1, . ing.
Each of the parts labeled with addresses 1 to n in the figure is a part in which address data corresponding to each address is recorded, and will be generally referred to as the part of address n hereinafter. In each of these parts, there are a large number of tracks, assuming that one round of the spiral recording track is counted as one track.

When playing the disc 1 as shown in FIG. 3 is scanned while reading the address data by the information reading means, and the information reading means is stopped at a position where the address data corresponding to the address of the desired program information is obtained. However, each portion where address data corresponding to each address is obtained extends over a predetermined range in the radial direction of the disk.
A situation arises in which the position where the information reading means stops is not constant within that range. For example, in the disk shown in FIG. 1, when the desired program information address is m, the information reading means reaches the part at address m from the part at address m-1, and the part at address m+1. In the case of arriving from the side, the stopping position is a position close to the boundary with the address m-1 part within the address m part and a position close to the boundary between the address m+1 part, respectively. It will end up being different. In this way, the fact that the stop position of the information reading means is not constant in the part where the address data corresponding to the address of the desired program information is obtained means that when the selected desired program information is reproduced, the reproduction start position is This results in the inconvenience that the value is not constant.

The present invention is intended to avoid the above-mentioned inconvenience, and in a disc player, the information reading means is placed at the tail end of the part of the disc where the program information immediately before the desired program information is recorded. It is an object of the present invention to provide a program selection device equipped with a drive control system for an information reading means that can perform position control so as to accurately position the information reading means at a corresponding position. Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows an example of a program selection device for a disk player according to the present invention. Reference numeral 1 designates a disk as shown in FIG. 1, on which a spiral recording track is formed on which program information accompanied by address data is recorded. For example, an audio signal is converted into a binary code signal. , digital data recorded with binary encoded address data.
It is an audio disc. This disk 1
is applied to a disc player having a built-in program selection device according to the present invention by being engaged with its rotation part 4, and is given a predetermined rotation by a disc rotation motor 5. The program information accompanied by the address data recorded on the disc 1 is read by an information reading means, for example, an optical head 6 in the case of an optical disc player in this example. The optical head 6, which is this information reading means, irradiates the disk 1 with a laser beam, receives the reflected laser beam modulated according to the program information with the address data recorded on the disk 1 as a read laser beam, The light is guided to the light-receiving element, and a reproduced signal is obtained by photoelectric conversion in the light-receiving element. The obtained reproduced signal passes through a regenerative amplifier circuit 7, and then is waveform-shaped by a waveform shaping circuit 8 to become a proper digital signal representing program information with address data, and then sent to a decoder 9.
supplied to From the decoder 9, program information S is obtained as a binary code signal from which address data has been removed, and address data Q is detected as a binary code signal. The program information S is sent, for example, to a circuit block (not shown) that processes it to obtain the final reproduced audio signal, while the address data Q is fed to an address/data decoder 10 that decodes it. be done. The address/data decoder 10 extracts the contents of the address data Q, that is, the address data corresponding to the address p of the program information being played back.
Q _p is decoded to obtain at its output a decoded output signal S _p representing the address p.

Reference numeral 11 denotes an address designation unit which generates a designation address signal S _n corresponding to a desired address m to be selected immediately before address m+1 where program information to be reproduced is recorded. The specified address signal S _n from this address specifying section 11,
The decoded output signal S _p from the address/data decoder 10 described above is derived from the three comparators 12, 13 and 14.
are supplied to each of them. These comparators 12, 13 and 14 output the decoding output signal S _p and the designated address signal.
Address p and address m are compared based on S _n , and when p>m, the comparator 12 outputs C ₁
The comparator 13 generates an output C ₂ when p=m, and the comparator 14 outputs an output C 2 when p<m.
Generate C ₃ . 15 and 16 are output switching sections, respectively, and 17, 18 and 19 are drive control sections. The drive control section 17 generates a control signal FR for fast forwarding in the reverse direction, the control signal JPR for backward track jump is generated from the drive control section 18, and the control signal FF for fast forwarding in the forward direction is generated from the drive control section 19. are generated, and these control signals FF, JPR, and FR are sent to the information reading means driving section 20.
According to each control signal, the drive unit 20
The optical head 6 is caused to perform a fast forward motion in the reverse direction, a track jump motion in the reverse direction, or a fast forward motion in the forward direction. That is, the drive control units 17 and 1
Numeral 9 constitutes a fast-forward control section, and drive control section 18 constitutes a track jump control section.
Here, the reverse direction is the direction from the outer peripheral edge of the disk 1 toward the central through-hole side, that is, the direction in which the addresses become smaller, and the forward direction is the direction from the through-hole side of the disk 1 to the outer peripheral edge side. , that is, the direction in which the addresses become larger.
The optical head 6 is connected to the recording section of the disk 1.
This is done by quickly jumping a predetermined number of recording tracks, for example 200 at a time, and the optical head 6 jumps the recording tracks of the disk 1 one to a few at a time on a small scale. This is done by finely jumping. Note that the optical head 6 reads address data both during the fast forward operation and during the track jump operation.

Next, to describe the program selection operation in more detail, the address specifying section 11 selects the desired address m.
is specified and the designated address signal S _n is sent to each comparison unit 1.
2, 13, and 14, first, the optical head 6 applies the address m on the disk to the side of the address larger than m, that is, the address m+.
When approaching from the part 1 side, initially p>m
Since the comparator 12 is in the state shown in _FIG . As a result, the first output C _1a is obtained from the output switching section 15, which is supplied to the drive control section 17, and the drive control section 17 supplies the reverse fast forward control signal FR to the drive section 20. As a result, the optical head 6 is fast-forwarded in the opposite direction toward the portion at address m. Then, when the optical head 6 reaches the address m, p=m and the comparator 13 outputs
C ₂ is obtained. The output C ₂ is supplied to the output switching unit 16, and the first output C _2a is supplied from the output switching unit 16.
is obtained and supplied to the drive control section 19, and the drive control section 19 supplies a forward fast forward control signal FF to the drive section 20. At the same time, the output C ₂ is also supplied to the output switching unit 15, which switches the output switching unit 15 to a state where it generates the second output C _1b as an output when an input is received, and further, the drive control unit 17
is also supplied to stop the supply of the reverse direction fast forward control signal FR to the drive section 20. This results in
The optical head 6 is fast-forwarded in the forward direction from the address m portion to the address portion greater than m. Then, when the optical head reaches the part of the address larger than m again, p>m and the comparator 1
Output C ₁ is obtained from output switching section 15.
supplied to From the output switching unit 15, this time,
The second output C _1b is obtained and supplied to the drive control section 18, which supplies a reverse track jump control signal JPR to the drive section 20. At this time, the output C ₁ is also supplied to the drive control section 19, and the supply of the forward fast forward control signal FF to the drive section 20 is stopped. As a result, the optical head 6 is placed in a track jump operation state in the opposite direction, and returns to the address m portion while performing a small and fine track jump. Also, the output
C _1b is also supplied to the output switching section 16, and when the output switching section 16 receives an input, it is switched to a state where the second output C _2b is generated as an output. Then, when the optical head 6 enters the part of the address m, p=m again and the output C ₂ is obtained from the comparator 13.
This is supplied to the output switching section 16. The second output C _2b is obtained from the output switching section 16 and is supplied to the drive control section 18 to stop supplying the reverse track jump control signal JPR to the drive section 20 . As a result, the drive unit 20 stops the optical head 6. At this time, the optical head 6 is stopped at the position entered by the track jump operation in the opposite direction from the side of the address larger than m, that is, the side of the address m+1, so that the stopping position is This is a portion close to the boundary between the portion at address m and the portion at address m+1, ie, the position corresponding to the end of the portion at address m.

Next, when the optical head 6 approaches the portion of the address m on the disk 1 from the side of the portion of the address smaller than m, that is, the portion of the address m-1, the state is initially p<m. An output _C3 is obtained from the comparator 14, which is supplied to the drive controller 19, and the drive controller 19 supplies a forward fast-forwarding control signal FF to the drive unit 20. As a result, the optical head 6 is fast-forwarded in the forward direction toward the portion of address m. Then, when the optical head 6 reaches the address m, p=m, and the comparing section 1
3 gives the output C ₂ . The output C ₂ is supplied to the output switching unit 16, and the first output C _2a is obtained from the output switching unit 16 and is supplied to the drive control unit 19, which subsequently outputs a control signal for forward fast forwarding. FF is supplied to the drive section 20. Therefore,
The optical head 6 continues to be fast-forwarded in the forward direction. At this time, the output C ₂ is also supplied to the output switching section 15,
The output switching unit 15 is switched to a state where it generates the second output C _1b as an output when an input is received. Eventually, when the optical head 6 passes beyond the address m and reaches the address larger than m, p>m
As a result, an output C ₁ is obtained from the comparator 12. The output C ₁ is supplied to the output switching unit 15, and the second output C _1b is obtained from the output switching unit 15 and is supplied to the drive control unit 18, which outputs a control signal for reverse track jump. JPR drive unit 2
Supply to 0. At this time, the output C ₁ is also supplied to the drive control section 19 and is used as a forward fast forward control signal.
The supply of FF to the drive unit 20 is stopped. As a result, the optical head 6 is placed in a track jump operation state in the opposite direction, and returns to the address m portion while performing a small and fine track jump. Further, the output C _1b is also supplied to the output switching unit 16, and the output switching unit 16 is switched to a state where it generates the second output C _2b as an output when an input is received.
Then, when the optical head 6 enters the part of the address m, p=m again and the comparator 13 outputs
C ₂ is obtained and supplied to the output switching section 16 . The second output C _2b is obtained from the output switching section 16, which is supplied to the drive control section 18, and is sent to the drive section 2 of the reverse track jump control signal JPR.
Stop the supply to 0. As a result, the drive section 2
0 causes the optical head 6 to stop. In this case too,
In the same manner as described above, the optical head 6 is stopped at the position where it entered the part of address m by a track jump operation in the opposite direction from the part of the address larger than m, that is, the part of address m+1. The location is address m+1 of address m part
This is a portion close to the boundary with the portion of address m, that is, a position corresponding to the end of the portion of address m.

As described above, whether the optical head 6 approaches the desired address m on the disk 1 from the address larger than m or the optical head 6 approaches the desired address m on the disk 1 from the address larger than m, the optical The head 6 is stopped at a position corresponding to the end of the portion of the desired address m, and the stopping position remains constant, so that the desired program information can be selected accurately. For example, in this example, program information with address data corresponding to address m+1 following address m can be reliably reproduced from the beginning with some time margin. In this case, the optical head 6 is in a fast forward operation state until it reaches a position near the target position, and is in a track jump operation state from the vicinity position to the target position, so that the optical head 6 can be quickly moved to the target position. , is done accurately.

As explained above, according to the present invention, when a program selection operation is performed in a disk player, the information reading means is caused to perform a fast-forward operation and a track jump operation, thereby allowing the information reading means to perform a fast-forward operation and a track-jump operation. It is possible to quickly and accurately stop the playback of the selected program information at the end of the portion where the program information immediately preceding the desired program information is recorded. You can always do it right the first time, with plenty of time to spare.

The present invention can be applied not only to an optical disc player having an optical head as an information reading means for reproducing digital audio discs as in the above embodiment, but also to various other disc players. Of course, the present invention can also be applied to a disc player equipped with various information reading means for reproduction.

[Brief explanation of the drawing]

FIG. 1 is a partial plan view showing an example of a disk on which address data is recorded along with program information, and FIG. 2 is a block connection diagram showing an example of a program selection device according to the present invention. In the figure, 1 is a disk, 6 is an information reading means (optical head), 9 is a decoder, 10 is an address/data decoding section, 11 is an address specifying section, 12, 13
and 14 are comparison sections, 15, 16, 21 and 22 are output switching sections, 17, 18 and 19 are drive control sections,
20 is an information reading means driving section.

Claims (1)

[Scope of utility model registration request] a decoder for decoding address data in a reproduced signal obtained from a disk having a recording track on which a plurality of program information and address data that changes according to each of the plurality of program information are recorded; and a designated address signal. an address specifying section that generates an address signal; a comparison section that compares a decoding output signal from the decoding section with the specified address signal; and an information reading means for the disk based on the comparison output from the comparison section. a fast forward control section for fast forwarding to a first position corresponding to a portion where address data corresponding to program information desired to be reproduced is recorded; and the information reading means based on a comparison output from the comparison section. Then, the recording track is moved from the first position to a second position corresponding to a portion of the disk where address data corresponding to the program information immediately preceding the program information desired to be reproduced is recorded. A program selection device for a disk player, comprising a track jump control section that continuously performs small track jumps.