JPH02297759A - Information reproducing device - Google Patents

Abstract

PURPOSE:To shorten the time for dubbing a bit of information from a CD side to a cassette tape by providing a reverse read means for accessing reversely the information recorded on a recording medium capable of random access against its forward direction and reading the recorded information. CONSTITUTION:The subject device is constituted in such a manner that a CD player is provided with a reversely reproducing servo part 13 for controlling a spindle motor 1 to rotate in the reverse direction to its normal rotative direction, and at the time of reading, the information recorded from the outer circumferential side to the inner circumferential side of the CD is reversely read out by a 2nd pickup 14. Since the CD 11 is stored with the information from the inner circumferential side, when the information recorded on the CD 11 from the outer circumferential side to the inner circumferential side is read out and reproduced, the information is reproduced from its end side to its beginning side. By this method, the recording information can reversely be reproduced, while the dubbing time can be shortened.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an information reproducing device for reproducing recorded information recorded on a randomly accessible recording medium such as an optical disc, and particularly relates to an information reproducing device for reproducing recorded information recorded on a randomly accessible recording medium such as an optical disc. This invention relates to a CD player that plays back audio information recorded on a CD player.

[Conventional technology]

FIG. 9 shows a conventional CD player.

The CD player includes a spindle motor 1 that rotationally drives the CD 11, and a first pickup 2 that reads signals on the CD 11.
, a pickup servo unit 3 that controls the position of the first pickup 2, and an APC (\tomaLlc Power C) that controls the output of a semiconductor laser (not shown) to a constant level.
a servo section 5 that performs servo for the spindle motor 1 and the pickup system, a preamplifier section 6 that amplifies the signal from the first pickup 2, and a decoder section 7 that performs decoding based on the output signal of the preamplifier section 6. and a DAC section (Dlg) that converts the signal decoded by the decoder section 7 into an audio output signal.
ltal to^nalog Converter part)
8, a control section 9 that controls the entire CD player, and a display operation section 10 that performs various displays and operations.

When a reproduction start operation is performed on the display operation section 10, the control section 9 causes the spindle motor 1 to rotate at a predetermined rotational speed (200 to 500 r, p, m) via the servo section 5, and causes the pickup servo section 3 to rotate the spindle motor 1 at a predetermined rotation speed (200 to 500 r, p, m). The position of the first pickup 2 is controlled. At the same time, the APC 4 keeps the output of the semiconductor laser constant, and the first pickup 2 reads the information on the CD 11. The information read by the first pickup is converted into an electrical signal, and the converted signal is sequentially amplified by a preamplifier section 6, further decoded by a decoder section 7, and sent to a DAC section 8. The DAC section 8 converts digital/
An audio output signal 12 is generated by analog conversion.

Conventionally, when dubbing information played by a CD player onto a compact cassette tape (hereinafter referred to as a cassette tape), it is common to record each side individually on each of the eight sides of the cassette tape. .

[Problem to be solved by the invention]

In the conventional CD player described above, when dubbing information from the CD onto a cassette tape, it is necessary to reproduce the information one side at a time, resulting in a problem that the dubbing time becomes long.

Therefore, in order to shorten dubbing time, for example,
It is conceivable to double the running speed of the cassette tape. However, in this case, there are problems in that it is not necessarily advantageous in terms of sound quality due to the running stability of the cassette tape, and that the data conversion speed and rotation speed of the CD player must be doubled.

Furthermore, when using a cassette tape recorder that can record both sides A and B at the same time, both the forward playback signal and the reverse playback signal are required, so the problem is that the backward playback signal cannot be output. was there.

[Means to solve the problem]

In order to solve the above problems, the present invention is configured to include a backward reading means for accessing information recorded on a randomly accessible recording medium in a direction opposite to the forward direction and reading the recorded information.

Further, a first reading means reads arbitrary recorded information by forwardly accessing information recorded on a randomly accessible recording medium, and simultaneously with reading by the first reading means, The apparatus is configured to include a second reading means for accessing and reading any of the recorded information.

Further, the recording medium is a disc-shaped recording medium, and the disc-shaped recording medium and the first reading means rotate in a first rotation direction at a first rotational speed, and the disc-shaped recording medium and the second reading means are configured to relatively rotate at a second rotational speed in a second rotational direction opposite to the first rotational direction.

Furthermore, the first reading means and the second reading means are provided on the same surface of the disc-shaped recording medium.

Further, the first reading means and the second reading means are provided on different sides of the disc-shaped recording medium.

[Effect]

The present invention is configured to include a backward reading means for accessing and reading information recorded on a randomly accessible recording medium in a direction opposite to the forward direction, so that the recorded information can be reproduced in the reverse direction. .

Further, a first reading means reads arbitrary recorded information by forwardly accessing information recorded on a randomly accessible recording medium, and simultaneously with reading by the first reading means, Since the second reading means is provided for accessing and reading any of the recorded information, information can be reproduced in both forward and reverse directions at the same time.

Further, the recording medium is a disc-shaped recording medium, and the disc-shaped recording medium and the first reading means rotate relative to each other in a first rotation direction at a first rotational speed, and Since the second reading means is configured to rotate at a second rotational speed in a second rotational direction opposite to the first rotational direction, the information recorded on the disk-shaped recording medium can be read. Information can be played back independently in forward and reverse directions.

〔Example〕

Embodiments of the present invention will be described with reference to FIGS. 1 to 8.

First Embodiment FIG. 1 shows a first embodiment in which the present invention is applied to a CD player. Components that are the same as those in the conventional example shown in FIG. 9 are designated by the same reference numerals, and detailed explanations will be omitted.

The difference from the conventional example shown in FIG. 9 is that the CD player is equipped with a reverse playback servo section 13 that controls the spindle motor 1 to rotate in the opposite direction to the normal rotation direction, and when reading, the CD player The second pickup 14 is configured to read information recorded toward the inner circumference in the opposite direction. Since information is stored on the CD 11 from the inner circumference side, when information recorded from the outer circumference side of the CD 11 is read and played back from the inner circumference side, the information is played back from the last side to the first side. It turns out.

FIG. 2 shows a block diagram of a cassette double-sided simultaneous recording system constructed using the CD player of FIG. 1.

The double-sided simultaneous recording system performs forward playback C.
A D player 15, a reverse playback CD player 16 that performs reverse playback, a cassette tape recorder 17 that can record both sides simultaneously, and a controller 18 that controls the entire system.
It is configured with.

The double-sided simultaneous recording cassette tape recorder 17 records a normal playback signal on the A side and a reverse playback signal on the 8th side at the same time, thereby making it possible to record in half the normal time, and to record the recorded cassette. The tape can be played on a regular cassette player.

Now, set the CD 19 to be recorded on side A of the cassette tape in the forward play CD player 15, and set the CD 20 to be recorded on side 8 of the cassette tape in the reverse play CD player 16.
shall be set to .

When the controller 18 outputs the recording start signal 21, the two CD players 15, 16 start operating at the same time.

The CD 19 set in the forward playback CD player 15 rotates in the normal rotation direction, and the forward playback signal 22
is output to the double-sided simultaneous recording cassette tape recorder 17, and a normal playback signal is recorded on side A of the cassette tape. On the other hand, the CD 20 set in the reverse playback CD player 16 rotates in the opposite direction to the normal rotation direction, and the reverse playback signal 23 is output to the double-sided simultaneous recording cassette tape recorder 17. A reverse playback signal 23 is recorded.

When a cassette tape recorded in the above manner is played back on a normal cassette tape player, side A is C.
The reproduced sound of D19 is reproduced, and in B, the reproduced sound of CD20 is reproduced in the normal state.

If the reverse playback CD player 16 is configured to include a switching means for switching between forward and reverse playback, 1
The CD player can be a CD player with forward and reverse playback functions.

Second Embodiment FIG. 3 shows a second embodiment of the present invention. Components that are the same as those in the conventional example shown in FIG. 9 are designated by the same reference numerals, and detailed explanations will be omitted.

The differences from the conventional example shown in FIG. 9 include a second pickup 14 that reads information in the opposite direction, a pickup rotation drive section 24 that rotationally drives the second pickup 14, and a second pickup that controls the position of the second pickup 14. Pickup servo section 2
5, a second APC 26 that controls the output of a second pickup semiconductor laser (not shown) at a constant level, a bidirectional reproduction servo section 27 that performs servo for bidirectional reproduction, a preamplifier section 6a that has two input/output systems, and a preamplifier section 6a that has two input and output systems. A decoder section 7a having input and output, a DAC section 8a having two inputs and outputs,
The point is that

At the same time as the CD 11 is rotationally driven by the spindle motor 1, the pickup rotation drive section 24 also rotationally drives the second pickup, and the second pickup rotates from the outer circumferential side to the inner circumferential side so as to read information in the opposite direction to the first pickup. by moving towards the second pick-up 14.
The information read by the preamplifier section 5a, the decoder section 7a, and the DAC section 8a sequentially process the information and convert it into an audio output signal 28 in the opposite direction. Similarly, the information simultaneously read by the first pickup 2 is converted into a forward audio output signal 12.

FIG. 4 shows a block diagram of a cassette double-sided simultaneous recording system constructed using the CD player of FIG. 3.

The cassette screen simultaneous recording system includes a bidirectional playback CD player 29, the aforementioned double-sided simultaneous cassette recorder 17, and a controller 18 for controlling the entire system.

The bidirectional playback CD player 29 has a forward playback output terminal 30 that outputs a forward playback signal based on information read by the first pickup 2, and a reverse playback output terminal 31 that outputs a reverse playback signal based on information read by the second pickup 14. It is equipped with

When the recording start signal 21 is outputted by the controller 18, the bidirectional reproduction CD player 29 rotates the CD 11 with the spindle motor 1, and at the same time, the pickup rotation drive section 24 also rotates the second pickup 14. For example, when the first pickup 2 is at the innermost periphery, the CD is rotating at approximately 500 r, p, m, so when the second pickup 2 is at the outermost periphery, the CD is rotating at approximately 700 r, p, m. By rotating the second pickup 14 at s, the second pickup 14 rotates in the opposite direction with respect to CD at approximately 20 Or, p, s.

As a result, the first pickup 2 plays back in the forward direction and is recorded on side A of the cassette recorder. On the other hand, the second pickup 14 plays back information in the opposite direction while rotating.
It is recorded on side 8 of the cassette recorder in the opposite direction to the one used during playback.

As the recording progresses and the second pickup 14 reaches a predetermined position, the second pickup 14 stops reading the signal.
Thereafter, signals are read only by the first pickup 2. This prevents the signal from becoming unreadable due to the intersection of the two pickups 2.14. In this case, it is also possible to have the first pickup 2 read the signal up to a predetermined position, and then only the second pickup 14 to read the signal.

When a cassette tape recorded in the above manner is played back using a normal cassette tape player, side A will play the sound recorded in the forward direction, and side 8 will play the sound recorded in the reverse direction. It will be played forward.

Third embodiment FIG. 5 shows a third embodiment of the present invention.

Components that are the same as those in the embodiment shown in FIG. 3 are given the same reference numerals, and detailed explanations will be omitted.

The difference from the embodiment shown in FIG. 3 is that the second pick-up 14 is provided on the opposite side of the CD's first pick-up, and the second pick-up 14 is configured to move from the outer circumferential side to the inner circumferential side. .

Since the second pickup 14 reads the signal from the back side of the CD 11, it does not intersect with the first pickup 2, so that information recorded anywhere on the CD 11 can be reproduced. Other operations are similar to the embodiment shown in FIG.

With this configuration, the first pick-up 2 and the second pick-up 14 can independently access the CD randomly, so two CDs can be accessed using the same CD.
This is the same as when using the D player.

Fourth Embodiment FIG. 6 shows a fourth embodiment of the present invention. Components that are the same as those in the embodiment shown in FIG. 3 are given the same reference numerals, and detailed explanations will be omitted.

The difference from the embodiment shown in FIG. 3 is that the CD 11 is fixed and includes a first rotation drive section 32 that rotationally drives the first pickup 2 and a second rotation drive section 33 that rotationally drives the second pickup 14. It is.

In addition, to simplify the explanation, the pickup servo section, A
PCs, etc. are omitted.

As a result, the first pick-up 2 and the second pick-up 1
It becomes possible to independently control the relative rotational speeds of the pickups 2 and 11 with respect to the CD 11, thereby improving the accuracy of information reading of each pickup 2.14.

Furthermore, if these pickups 2.14 are provided on the same side of the CD 11, the rotational drive speed of the second pickup 14 need only be driven at a lower speed than in the embodiment shown in FIG. becomes easier.

Fifth Embodiment FIG. 7 shows a schematic configuration diagram of a fifth embodiment regarding the first rotation drive section and the second rotation drive section.

In FIG. 7, a linear motor 34 is used in the first rotation drive unit 32 to rotate the turntable 35.
It is a schematic configuration diagram when a first pickup 2 is provided on the top.

The structure using a linear motor for the first rotation drive section 32 is similar to the embodiment shown in FIG.

Sixth Embodiment FIG. 8 shows a schematic configuration diagram of a sixth embodiment regarding the first rotation drive section and the second rotation drive section.

FIG. 8 shows the first rotation drive section 32 and the second rotation drive section 33.
A schematic configuration diagram when ring-shaped linear motors 35a and 36b are used is shown in FIG. The other points are the same as the embodiment shown in FIG.

〔Effect of the invention〕

The present invention includes a backward reading means for accessing and reading information recorded on a randomly accessible recording medium in a direction opposite to the forward direction, so that recorded information can be reproduced in the reverse direction. It has the effect of being able to do it.

Further, a first reading means reads arbitrary recorded information by forwardly accessing information recorded on a randomly accessible recording medium, and simultaneously with reading by the first reading means, Since the second reading means is provided for accessing and reading any of the recorded information, forward playback and reverse playback can be performed at the same time, resulting in an effect that the playback time can be shortened.

Further, the recording medium is a disc-shaped recording medium, and the disc-shaped recording medium and the first reading means rotate relative to each other in a first rotation direction at a first rotational speed, and Since the second reading means is configured to rotate at a second rotational speed in a second rotational direction opposite to the first rotational direction, the disk-shaped recording medium can be reproduced in the forward direction and in the reverse direction. This has the effect that reproduction can be performed simultaneously and reproduction time can be shortened.

Further, since the first reading means and the second reading means are provided on different sides of the disk-shaped recording medium, each can be independently and randomly accessed, and control is facilitated.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a first embodiment of the present invention, Fig. 2 is a block diagram when the embodiment of Figs. 1-1 is applied to a double-sided simultaneous recording system, and Fig. 3 is a second embodiment of the invention 4 is a block diagram of the embodiment of FIG. 3 applied to a double-sided simultaneous recording system, FIG. 5 is a block diagram of the third embodiment of the present invention, and FIG. 6 is a block diagram of the embodiment of the present invention. 7 is a block diagram of the fifth embodiment regarding the first rotary drive section and the second rotary drive section, and FIG. 8 is a block diagram of the fifth embodiment regarding the first rotary drive section and the second rotary drive section. A schematic configuration diagram of the embodiment, and FIG. 9 is a block diagram of a conventional example. 1...Spindle motor 2...First pickup 3...Pickup servo section 4...APC 5.Servo section 6...Preamplifier section 7...Decoder section 8...DAC section 9-. -Control unit 10...Display operation unit 11...CD 12...Audio output signal 13...Reverse playback servo unit 14...Second pick-up 15...Forward playback CD player 16... Reverse playback CD player 17...Double-sided simultaneous recording cassette recorder 18...Control] Roller 19...CD 20...CD 21...Recording start signal 22...Forward playback signal 23... - Reverse direction reproduction signal 24...Pickup rotation drive section 25...Second pickup servo section 26...Second APC 27...Bidirectional reproduction servo section 28...Audio output signal (reverse direction) 29...・Bidirectional playback CD player 30...Forward pest output terminal 31...Reverse direction output terminal 32...First rotation drive unit 33...Second rotation drive unit 34...Linear motor 35... - Turntable 36a...Ring-shaped linear motor 36b...Ring-shaped linear motor. Applicant's agent Yasushi Ishikawa ■-)-' 1d: : Insurrection 11: CD Figure 4

Claims (1)

[Scope of Claims] 1. An information reproducing device for reproducing information recorded on a randomly accessible recording medium, comprising a reverse direction reading means for accessing in a direction opposite to the forward direction and reading the recorded information. An information reproducing device characterized by: 2. In an information reproducing apparatus for reproducing information recorded on a randomly accessible recording medium, a first reading means for accessing in a forward direction and reading any of the recorded information; and a first reading means for reading the recorded information by the first reading means. An information reproducing apparatus characterized by comprising a second reading means for reading any of the recorded information by accessing in a direction opposite to the forward direction at the same time as reading. 3. In the information reproducing device according to claim 2,
The recording medium is a disc-shaped recording medium, and the disc-shaped recording medium and the first reading means rotate relative to each other at a first rotational speed in a first rotation direction, and the disc-shaped recording medium and the first 2. An information reproducing device, wherein the information reproducing device rotates at a second rotational speed relative to the reading means in a second rotational direction opposite to the first rotational direction. 4. The information reproducing apparatus according to claim 2 or 3, wherein the first reading means and the second reading means are provided on the same surface of the disk-shaped recording medium. 5. The information reproducing apparatus according to claim 2 or 3, wherein the first reading means and the second reading means are provided on different sides of the disk-shaped recording medium.