JP3107221B2 - Disc playback device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a disk reproducing apparatus for reproducing information from a disk-shaped recording medium.

[Prior Art] FIG. 25 is a block diagram showing an example of a conventional disk drive. 1 is a compact disk, 2 is a spindle motor, 3 is a servo circuit, 4 is an optical pickup, 5 is a slide motor, and 6 is a slide motor. Waveform shaping circuit, 7 is a digital signal processing circuit, 8 is a D / A (digital / analog) conversion circuit,
9 is an output terminal, and 10 is an access control device.

In FIG. 1, a compact disk 1 as a record carrier is rotated by a spindle motor 2, and data consisting of "1" and "0" bits recorded thereon is taken out as an analog signal by an optical pickup 4. The waveform shaping circuit 6 shapes the analog signal supplied from the optical pickup 4 to digital data. The digital data obtained by performing the waveform shaping by the waveform shaping circuit 6 in this manner is supplied to the digital signal processing circuit 7.

As shown in FIG. 26, the digital signal processing circuit 7 includes a synchronization detection circuit 11, a PLL (phase locked loop) circuit 1
2, a demodulation circuit 13, a crystal oscillation circuit 14, a sub-coding detection circuit 15, and a RAM (random access memory) 16. The synchronization detection circuit 11 performs frame synchronization from digital data supplied from the waveform shaping circuit 6. Detect and pl
The L circuit 12 reproduces a clock from the same digital data. The demodulation circuit 13 takes in the digital signal from the synchronization detection circuit 11 and outputs a CIRC (Cross Interleave Read-Solomon Code).
Error detection and correction according to e) are performed, and digital audio data _AD is output according to a reproduction timing signal supplied from the crystal oscillation circuit 14. The sub-coding detection circuit 15 reproduces the disk address information _{DAD and the} like for performing the track positioning. The RAM 16 operates as a buffer for CIRC deinterleaving and error correction processing.

Connexion back to FIG. 25, digital audio data A _D output from the digital signal processing circuit 7 is converted by the D / A converter 8 into an analog audio signal A _A, is output from the output terminal 9. The access control device 10 includes a digital signal processing circuit 7
Based on the disk address information D _AD supplied from, and controls the slide motor 5 or the optical pickup 4 through the servo circuit 3 performs the track positioning. The servo circuit 3 controls the rotation speed of the spindle motor 2 based on the clock and the reproduction timing signal supplied from the PLL circuit 12 and the crystal oscillation circuit 14 of the digital signal processing circuit 7,
Further, based on the access control signal C _AC supplied from the access control device 10, the slide motor 5, to position the optical pickup 4.

The operation of the disk device having the above configuration will be described below.

The compact disk 1 rotates at a predetermined speed by driving the spindle motor 2 according to a control signal from the servo control signal 3. The optical pickup 4 irradiates a laser beam, receives reflected light from the recording film surface of the compact disk 1, and outputs an analog signal corresponding to a change in the amount of light. This analog signal is shaped by a waveform shaping circuit 6 into digital waveform data corresponding to data consisting of "1" and "0" bits recorded on the compact disk 1. Digital data output from the waveform shaping circuit 6 is converted into digital audio data A _D In digital signal processing circuit 7, is output from the output terminal 9 is converted into an analog audio signal A _A by the D / A conversion circuit 8.

In this apparatus, even if external vibration is applied during the reproduction of the audio signal, the servo circuit 3 prevents the laser light from failing to follow the track when irradiated from the optical pickup 4.
Thus, the vibration of the optical pickup 4 is suppressed.

It should be noted that as related devices of this type, there are, for example, those described in JP-A-2-158965, JP-A-2-143922, and the like.

[Problems to be Solved by the Invention] By the way, conventionally, there is known a disc reproducing apparatus in which loading means is provided so that a compact disc to be reproduced can be exchanged. It is desirable that reproduced audio output be obtained without interruption.

The present invention has been made in view of this point, and an object of the present invention is to provide a disc reproducing apparatus capable of outputting reproduced information without interruption even when a disc-shaped recording medium is exchanged. It is in.

Means for Solving the Problems In order to achieve the above object, the present invention provides a disk-shaped recording medium in which a plurality of tracks are spirally connected.
Rotating means for rotating at high speed n times (where n is a positive integer) a normal speed at which information recorded on the recording medium can be reproduced at a prescribed transfer speed, and light irradiation for irradiating the recording medium with light Means, an irradiation position control means for controlling an irradiation position of light on the recording medium, a disk reproducing means for reproducing information based on reflected light of the light irradiated on the recording medium, and an output signal from the disk reproducing means. At least one of memory means for writing the reproduction information to be written, memory control means for reading the reproduction information written to the memory means, termination of reproduction of the information from the recording medium, and an instruction to discharge the recording medium. And loading means for exchanging a recording medium for reproducing information by the disc reproducing means with another recording medium. The irradiation position control means stores the reproduction information in the memory means. A first mode for controlling the light irradiating means so as to sequentially move the light irradiating position on the recording medium along the track according to whether or not the information is satisfied; Each time the information of the track is reproduced, the second mode of controlling the light irradiating means is selected so that the operation of returning the light irradiation position to the recording medium by one track is repeated (n-1) times. The memory control unit reads the reproduction information from the memory unit even during a period in which the recording medium for reproducing information by the disk reproduction unit by the loading unit is replaced with the another recording medium.

The present invention also provides a rotating means for rotating a disk-shaped recording medium in which a plurality of tracks are spirally connected to each other at a higher speed than a normal speed at which information recorded on the recording medium can be reproduced at a prescribed transfer speed. A light irradiating means for irradiating the recording medium with light, an irradiation position control means for controlling a light irradiating position on the recording medium, and a disk for reproducing information based on reflected light of the light irradiating the recording medium A reproducing unit, a memory unit to which reproduction information output from the disk reproducing unit is written, a memory control unit to read the reproduction information written to the memory unit, an end of reproduction of the information from the recording medium, Loading means for exchanging a recording medium for reproducing information by the disc reproducing means with another recording medium in accordance with at least one of the recording medium discharge instructions. The irradiation position control means controls the light irradiation so as to sequentially move the light irradiation position on the recording medium along the track according to whether the reproduction information is filled in the memory means. A first mode for controlling the means and a second mode for controlling the light irradiation means so as to return the light irradiation position on the recording medium each time the disc reproducing means reproduces a predetermined amount of information. The memory control means reads the reproduced information from the memory means even during a period when the recording medium for reproducing the information by the disc reproducing means by the loading means is replaced with another recording medium.

Further, the present invention provides a rotating means for rotating a disk-shaped recording medium in which a plurality of tracks are spirally connected to each other at a higher speed than a normal speed at which information recorded on the recording medium can be reproduced at a prescribed transfer speed. A light irradiating means for irradiating the recording medium with light, an irradiation position control means for controlling a light irradiating position on the recording medium, and a disk for reproducing information based on reflected light of the light irradiating the recording medium A reproducing unit, a memory unit to which reproduction information output from the disk reproducing unit is written, a memory control unit to read the reproduction information written to the memory unit, an end of reproduction of the information from the recording medium, Loading means for exchanging a recording medium for reproducing information by the disc reproducing means with another recording medium in accordance with at least one of the recording medium discharge instructions. The irradiation position control means controls the light irradiation so as to sequentially move the light irradiation position on the recording medium along the track according to whether or not the reproduction information is filled in the memory means. A first mode for controlling the means and a second mode for controlling the light irradiating means so as to repeat the information reproducing operation by the disk reproducing means and the operation of returning the light irradiation position to the recording medium. Then, the memory control means reads the reproduction information from the memory means even during a period when the recording medium for reproducing the information by the disc reproducing means by the loading means is exchanged for another recording medium.

[Operation] In the disk reproducing apparatus according to the present invention, information reproduced from a disk-shaped recording medium in which a plurality of tracks rotating at a speed higher than a specified rotation speed are spirally connected,
The data is written to the memory means and read by the memory control means, and the irradiation position control means for controlling the irradiation position of the light on the recording medium depends on whether or not the reproduction information is filled in the memory means. A first mode for controlling the light irradiation means so as to sequentially move the light irradiation position on the recording medium along the track; and each time the disc reproducing means reproduces a predetermined amount of information, the light irradiation on the recording medium is performed. A second mode for controlling the light irradiating means so as to return the irradiation position, wherein the information is exchanged from a recording medium on which information has been reproduced by the loading means to another recording medium, and the information is exchanged. During the period until the is reproduced, the reproduction information from the recording medium before the exchange is continuously read from the memory means. When the reading of the reproduction information is completed, the exchange information is subsequently executed. Reading of information written in the memory means is reproduced from another recording medium which is begins.
In this way, even if the recording medium is exchanged, the reproduction information is read without interruption from the memory means.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a basic configuration of a disk reproducing apparatus according to the present invention, in which 17 is a high-speed data reproducing section, 18 is a buffer RAM, 19 is a RAM control device, and 20 is a control device.
Parts corresponding to those in FIG. 25 are denoted by the same reference numerals.

In the figure, a high-speed data reproducing unit 17 comprises a compact disk 1, a spindle motor 2, a servo circuit 3, an optical pickup 4, a slide motor 5, a waveform shaping circuit 6, and a digital signal processing circuit 7, as shown in FIG. It has the same configuration as the technology, but performs data reproduction at a speed higher than a prescribed data transfer speed required for reproduction of the compact disk 1. Here, the reproduction speed of the compact disk 1 is set to twice the prescribed speed. For this reason, the compact disc 1 is rotated by the spindle motor 2 at twice the speed (2.4 to 2.8 m / sec) of a normal (1.2 to 1.4 m / sec) compact disc player.

An analog signal obtained from the optical pickup 4 as in the prior art shown in FIG. 25 is subjected to waveform shaping by a waveform shaping circuit 6 to become double speed digital data, and is supplied to a digital signal processing circuit 7.

Digital signal processing circuit 7 is supplied to the buffer RAM18 by the digital data on speed digital audio data A _D2. Buffer RAM18, under the control of the RAM controller 19, and stores the speed digital audio data A _D2, supplied to the D / A conversion circuit 8 reads as digital audio data A _D normal data transfer rate.

D / A conversion circuit 8 converts the digital audio data A _D into an analog audio signal A _A, from the output terminal 9. This analog audio signal A _A may be either stereo or monaural.

When a certain type of conversion is applied to the digital audio data _AD , a conversion circuit 20 having a configuration as shown in FIG. 2 is used instead of the D / A conversion circuit 8. In the conversion circuit 20, the arithmetic circuit 21 solves the transform being applied to digital audio data A _D, is converted into the analog audio signal A _A a D / A converter 22.

Connexion back to Figure 1, the servo circuit 3 controls the rotational speed of the spindle motor 2 based on the clock supplied from the digital signal processing circuit 7, In addition, the access control signal C _AC supplied from the access control circuit 10 Based on this, track positioning of the slide motor 5 and the optical pickup 4 is performed. The access control apparatus 10, based on the digital address information D _AD supplied from the digital signal processing circuit 7 controls the slide motor 5 and the optical pickup 4 through the servo circuit 3 performs the track positioning. RAM
The control device 19 controls the input / output timing and address of the buffer RAM 18.

FIG. 3 is a block diagram showing a specific example of the digital signal processing circuit 7 in FIG. 1, and portions corresponding to FIG. 26 are denoted by the same reference numerals.

In the figure, a synchronization detection circuit 11 detects frame synchronization from digital data from the waveform shaping circuit 6. PLL
The circuit 12 reproduces a clock from the digital data. The demodulation circuit 13 takes in the digital signal from the synchronization detection circuit 11 and uses the RAM 16 to detect and correct errors due to CIR deinterleaving and CIRC.
The double-speed digital audio data _AD2 is generated based on the reproduction timing signal supplied from. The sub-coding detection circuit 15 reproduces the disk address information _{DAD and the} like for performing the track positioning. Reproduction timing signal clock or crystal oscillator circuit 14 the PLL circuit 12 outputs the output is supplied to the servo circuit 3 (FIG. 1), disk address information D _AD access control device 10 to output the sub Corde queuing detection circuit 15 (FIG. 1).

The above operation is the same as that of the conventional digital signal processing circuit 7 shown in FIG. 26, except that the digital signal to be processed is double-speed digital data.

The digital signal processing circuit 7 shown in FIG. 3, in addition to this, the demodulation circuit 13 generates the buffer RAM 18 (FIG. 1) of the read / write timing signal R / W and tracking out detection signal T _E output I do.

When the demodulation circuit 13 cannot detect the address information on the compact disk 1 from the digital signal supplied from the synchronization detection circuit 11 or cannot correct the error of the data, it determines that the tracking is out of track and sets "H" (high level). thereby generating a tracking out detection signal T _E of, stops the output of the error correction and double-speed digital audio data a _D2 data. The "H" tracking out detection signal T _E by the access controller 10 of (FIG. 1) performs the track positioning to disk address tracking out occurs, but tracking deviated by connexion demodulation circuit 13 to the track positioning When resulting address data is input again, the demodulation circuit 13 resumes the output of the error correction and double-speed digital audio data a _D2.

Next, the control operation of the address control device 10 in FIG. 1 will be described with reference to FIG. 4 and FIG. However, FIG. 4 shows the track on the compact disk 1 for three laps (track N to
N + 2), and FIG. 5 shows N tracks to N on the compact disc 1 of the laser beam irradiated by the optical pickup 4.
The locus at the +2 track portion is shown.

Assuming that FIG. 5A shows the same control operation at the time of reproduction as in the conventional example in which the compact disk 1 rotates at the normal speed, FIG. The control operation at the time of reproduction is shown. In this embodiment, the number of rotations of the compact disk 1 is twice as large as usual, and the track jumps to the inner circumference by one track at points A, B and C. The data is actually reproduced during the periods a, c, and e, and the periods b, d, and f are waiting times (the mode during this period is referred to as a normal data supplement mode).

FIG. 5 (c) shows a control operation in the disk reproducing apparatus shown in FIG. 1 when data needs to be replenished at a high speed to the buffer RAM 18 at the time of start-up or when a tracking error occurs. In this case, continuous reproduction is performed without performing the above-described track jump (this mode is called a high-speed data replenishment mode).

Here, the case where the compact disc 1 is rotating at 2 × speed has been described, but the 3 × speed (3.6 m / sec)
~ 4.2m / sec) or 4x speed (4.8m / sec ~ 5.6m / sec).

The control operation of the address control device 10 in the case of the triple speed is the fourth.
Referring to FIG. 6 by taking the track portion shown in the drawing as an example, the control operation at the time of reproduction is the same as that of the conventional example in which the compact disk 1 shown in FIG. The control operation at the time of normal reproduction in the disk reproducing apparatus shown in FIG. 1 is as shown in FIG. 6 (b). Here, since the number of rotations of the compact disk 1 is three times the normal (conventional example), the track jumps to the inner circumference by one track at points A, B, C, D, E and F. The data is actually reproduced during the periods a, d, and g, and during the periods b, c, e, f, h, and i, the normal speed data supplement mode with the waiting time is set. FIG. 6 (c) shows the first
In the disc reproducing apparatus shown in the figure, there is shown a control operation when it is necessary to replenish the buffer RAM 18 with data at a high speed, such as at the time of start-up or when a tracking error occurs. In this case, a high-speed data replenishment mode for continuous reproduction without performing a track jump is set.

Whether or not it is necessary to refill the buffer RAM 18 at high speed is determined by the instruction signal _RA from the RAM control device 19. When the instruction signal _RA is "H", the high-speed data replenishment mode is performed.
When it is "L", it is the normal speed data supplement mode.

Next, the control operation of the RAM control device 19 in FIG.
This will be described with reference to FIG. 7 by taking the track portion of FIG. 4 as an example. Although not shown, in FIG. 4, the tracks are [N + 2] track, [N + 3] track, and [N
+4] Track, ... [N], [N + 1],... In FIG. 7 are [N] tracks, respectively.
[N + 1] track shows the reproduced data from ..., (Input) is speed digital audio data A _D2,
(Output) is digital audio data _AD , which indicates the input and output of the buffer RAM 18, respectively.

FIG. 7A shows the input and output of the buffer RAM 18 at the time of startup. At this time, the instruction signal _RA is "H" (high-speed data replenishment mode). As shown
Since the buffer RAM 18 inputs digital audio data at a double speed and outputs it at a normal speed, the unreproduced data in the buffer RAM 18 increases. This control is performed in buffer RAM1
8 continues until the unplayed data is filled.

FIG. 7B shows inputs and outputs of the buffer RAM 18 when the buffer RAM 18 is filled with unreproduced data during normal reproduction. At this time, the instruction signal _RA is "L" (normal data supplement mode). As shown in the figure, double speed digital audio data is intermittently input and output at normal speed. For this reason, buffer RAM 18
The unplayed data within does not increase or decrease. Where m
Depends on the capacity of the buffer RAM 18. When data is output in the normal data replenishment mode, data that is m tracks ahead of the already output data is input to the buffer RAM 18.

FIG. 7 (c) shows the input and output of the buffer RAM 18 when a tracking error occurs. At this time,
The instruction signal _RA is "L" (normal data supplement mode). As mentioned above, when tracking is off, demodulation circuit
13 since the operation of (FIG. 3) is stopped, digital audio data A _D2 of speed is not input to the buffer RAM 18. Therefore, as shown in the figure, the input is not performed, and the output is performed only at the normal speed, so that the unreproduced data in the buffer RAM 18 decreases. However, in the normal data replenishment mode, the data up to the m-th track has already been input to the buffer RAM 18, so that the output of the buffer RAM 18 is not interrupted as long as these unreproduced data exist.

FIG. 7 (d) shows the input and output of the buffer RAM 18 after recovery from tracking failure. At this time, the instruction signal _RA is "H" (high-speed data replenishment mode). Digital audio data A at double speed as shown
_{Since D2} is input and output at normal speed, buffer RA
Unplayed data increases with M18. This control continues until the buffer RAM 18 is filled with unreproduced data. Here, it is assumed that k tracks of data are left in the buffer RAM 18 at the time of recovery from tracking failure (where 0 <k <m).

The above is the case where the compact disk 1 is rotating at 2 × speed, but it is possible at 3 × speed or 4 × speed. 3
The control operation of the RAM control device 19 in FIG. 1 in the case of double speed will be described with reference to FIG.

FIG. 8A shows the input and output of the buffer RAM 18 at the time of startup. At this time, the instruction signal _RA is "H" (high-speed data replenishment mode). As shown
Since the buffer RAM 18 inputs digital audio data at triple speed and outputs it at normal speed, the unreproduced data in the buffer RAM 18 increases. This control is performed in buffer RAM1
8 continues until it is filled with unplayed data.

FIG. 8B shows inputs and outputs of the buffer RAM 18 when the buffer RAM 18 is filled with unreproduced data during normal reproduction. At this time, the instruction signal _RA is "L" (normal data supplement mode). As shown, since the triple speed digital audio data is intermittently input and output at the normal speed, the unreproduced data in the buffer RAM 18 does not increase or decrease. Here, m depends on the capacity of the buffer RAM 18. When data is being output in the normal data replenishment mode, the data which is m tracks ahead of this already output data is stored in the buffer RAM 18.
Will be entered.

FIG. 8 (c) shows the input and output of the buffer RAM 18 when a tracking error occurs. At this time,
The instruction signal _RA is "L" (normal data supplement mode). As mentioned above, when tracking is off, demodulation circuit
Since the operation of FIG. 13 (FIG. 3) is stopped, the triple speed digital audio data is not input to the buffer RAM 18. Therefore, as shown in the figure, the input is not performed, and the output is performed only at the normal speed, so that the unreproduced data in the buffer RAM 18 decreases. However, in the normal data replenishment mode, the data up to the m-th track has already been input to the buffer RAM 18, so that the output of the buffer RAM 18 is not interrupted as long as these unreproduced data exist.

FIG. 8 (d) shows the input and output of the buffer RAM 18 after recovery from tracking failure. At this time, the instruction signal _RA is "H" (high-speed data replenishment mode). As shown in the figure, digital audio data is input at 3x speed and output at normal speed.
Unplayed data increases with M18. This control continues until the buffer RAM 18 is filled with unreproduced data. Here, it is assumed that data for k tracks remains in the buffer RAM 18 at the time of recovery from the out-of-track state (where 0 <k <m).

In the disk reproducing apparatus shown in FIG. 1 described above, audio signals are targeted, but the same applies to other information signals such as video signals.

In the disk reproducing apparatus shown in FIG. 1 having the above-described configuration, even if the track following operation fails due to temporary strong external vibration, the digital audio data recorded in the buffer RAM 18 is reproduced. In the meantime, re-tracking is performed, and digital audio data is buffered at double speed.
Since the RAM 18 is refilled, there is an effect that the audio output is not interrupted.

FIG. 9 is a block diagram showing an embodiment of a disk reproducing apparatus according to the present invention, in which 23 is a control unit, 24 is a loading control unit, 25 is an eject switch, and 26 is a loading motor. The same reference numerals are given to the portions corresponding to and the duplicate description will be omitted.

In FIG. 9, the control device 23 comprises the access control device 10 and the loading control device 24 described above. When the reproduction of the compact disk 1 is completed, the digital signal processing circuit 7 outputs a "H" reproduction end signal in addition to the various signals described above.
To generate a P _E.

The loading control device 24 receives the reproduction completion signal P _E of "H" from the digital signal processing circuit 7 checks the playback end compact disc 1, and outputs the the loading control signal C _L0 of "H". Rohde Ing motor 26 receives the the loading control signal C _L0 of the "H", and discharging the compact disc 1, and the loading of the following compact disc 1, when the the loading is completed,
And it outputs the the loading end signal L _E of the "H". The loading controller 24, when the the loading end signal L _E of "H" from Rohde queuing motor 26 is supplied, to make sure that the loading of the compact disc 1 is completed.

Also, when the eject switch 25 is turned on, the loading control device 24 outputs the "H" loading control signal C.
Outputs the _L0 was drained compact disc 1 by the loading of the next compact disc, it receives the the loading end signal L _E "H", the recognize the loading completion.

FIG. 10 is a block diagram showing a specific example of the digital signal processing circuit 7 in FIG. 9, and portions corresponding to FIG. 3 are denoted by the same reference numerals.

This specific example is the same as the specific example shown in FIG.

That is, in FIG. 10, the demodulation circuit 13, in addition to the function of the demodulation circuit 13 in Figure 3 has a function of generating a reproduction end signal P _E. Reproduction end signal P _E is set to "H" when the reproduction of all the tracks of the compact disc 1 is completed. The digital signal processing circuit 7 performs error correction processing and output of double-speed digital audio data A _D2 from the start of the discharging operation of the compact disk 1 to the input of the reproduction data of the next compact disk 1. Stop.

Next, input / output control of the RAM control device 19 in FIG. 9 when the compact disk 1 is replaced will be described with reference to FIG. FIG (a) shows a speed digital audio data A _D2 is an input buffer RAM 18, Fig. (B) shows the digital audio data A _D is the output of the buffer RAM 18. D1 is reproduction data of the first compact disk 1, and D2 is reproduction data of the second compact disk.

The point (A) in FIG. 11 indicates the end point of the reproduction of the first compact disk 1. That is, at the time of (A), 1
Th by or transferred from the compact disc 1 to the buffer RAM18 all speed digital data A _D2 reproduced has ended, or Idi ecto Sui Tutsi 25 becomes ON, 1 sheet of the reproduced data of the compact disc 1 Transfer to the buffer RAM 18 is stopped.

Assuming that the time required to finish reproducing all the data stored in the buffer RAM 18 is TM (sec), even after the first compact disk 1 is stopped, the first compact disk 1 is kept until the time (C). The digital audio data reproduced from the buffer RAM 18 is output from the buffer RAM 18. Here, from the end of the reproduction of the first compact disk 1,
Eject it, load the second compact disc 1, and set TL to the time it takes for the data to be reproduced.
(Sec). As shown, when TL <TM, the first
As shown in FIG. 1 (b), the digital audio data D1 and D2
There is no time gap between them.

In this embodiment having the above-described configuration, in addition to the effects achieved by the disc reproducing apparatus shown in FIG. 1, when the compact disk is replaced, the output of the reproduction sound of the first compact disk and the second compact disk are completed. There is an effect that no temporal interruption occurs between the start of outputting the reproduced sound of the compact disk.

FIG. 12 is a block diagram showing another embodiment of the disk reproducing apparatus according to the present invention, in which 18 is a buffer RAM, 27 is a digital audio adding circuit, and the parts corresponding to those in FIG. And a duplicate description will be omitted.

In the figure, under the control of the RAM controller 19, the buffer RAM 18, speed digital audio data A _D2 from digital signal processing circuit 7 is written, two normal transfer rate offset in time in the same information content the digital audio data a _D ', "reads the. these digital audio data _{a D a D', a D} " is the digital audio summation circuit 27, R
The digital audio data _AD is added in accordance with the timing signal _ADT from the AM control device 19.

Next, referring to FIG. 13, the RAM control device 19 in FIG.
And the operation of the buffer RAM 18 and the digital voice adding circuit 27 based on the control operation will be described.

13 (a) shows a speed digital audio data A _D2 inputted to the buffer RAM 18, FIG. 13 (b), (c)
Is digital audio data A _D outputted from each buffer RAM 18 ', showing the A _D ". Fig. 13 (d) are showing the digital voice data A _D output from the digital audio adder circuit 27. Further, S1 is S2 indicates the reproduction data of the first music, S2 indicates the reproduction data of the second music, and A indicates the end point of the reproduction of the data of the first music from the compact disk 1. That is, the double-speed digital data of the first music at the time A The transfer of the audio data S1 to the buffer RAM 18 is completed, and the transfer of the double-speed digital audio data S2 of the second music starts.

B is a time when the first music S1 of the digital audio data A _D 'output from the buffer RAM 18 is ended. The first track S1 of the speed digital audio data A _D2 which has finished recording the buffer RAM302 at point A, all the time required to finish playing the buffer RAM18 and TM (sec), TM> ( A, between B The time point B is set so that (time interval).

C is the start time of the second song S2 of the digital audio data A _D "output from the buffer RAM 18. This C time is
Set between A and B points. According to this, only the digital audio data S1 of the first tune is supplied to the digital audio addition circuit 27 in the period up to the point C,
In the period, both the digital audio data near the end of the first song S1 and the digital audio data near the beginning of the second song S2 are simultaneously supplied. In the period c after the time B, only the digital audio data S2 of the second song is supplied, and the timing signal _ADT is It is supplied to the digital voice addition circuit 27 at the timing of the point C. As a result, as shown in FIG. 13 (d), the digital audio addition circuit 27 fades out the digital audio data A _D ′ in the period b between the points C and B, and
A _D ″ is fed in and added to the digital audio data.
Generate _AD .

FIG. 14 is a block diagram showing a specific example of the digital voice addition circuit 27 in FIG. 12, wherein 28 and 29 are buffers, 30 is an addition control circuit, and 31 is an addition circuit.

In the figure, buffers 28 and 29 are buffers for storing one sampling data of digital audio data _AD 'and _AD ", respectively. The outputs of these buffers 28 and 29 are taken into an adder 31 respectively. The data are added and output as digital audio data _AD .
9. The output timing of the adder circuit 31 is controlled by the buffer RAM 18
Output timing control of the digital audio data A _D 'and A _D ' from FIG. 12 is performed by the same clock.

The addition control circuit 30 adjusts the addition ratio of the addition circuit 31 to the digital audio data S1 and S2 according to the timing signal _ADT indicating the time point C in FIG. Thus, as shown in FIG. 13 (d), the addition ratio with S1 and S2 is adjusted so that the first song S1 is faded out and the second song S2 is faded in during the period b.

In this embodiment having the above-described configuration, in addition to the effects of the above-described embodiment, an effect of enabling cross-fade reproduction between music pieces can be obtained.

FIG. 15 is a block diagram showing still another embodiment of the disk reproducing apparatus according to the present invention, wherein 8A and 8B are D / A conversion circuits, 18A and 18B are buffer RAMs, and 32 is a buffer RAM circuit. Parts corresponding to those in FIG. 9 are denoted by the same reference numerals, and redundant control is omitted.

9, the D / A conversion circuits 8A and 8B correspond to the D / A converters in FIG.
This is equivalent to the A conversion circuit 8. Spindle motor 2 is also twelfth
It has the same function as the spindle motor 2 in the figure, but rotates at three times the normal speed. Accordingly, the optical pickup 4, the slide motor 5, the servo circuit 3, the analog waveform shaping circuit 6 and the like have the same functions as those of the embodiment shown in FIG. I'm sorry. Also,
Buffer RAMs 18A and 18B are also buffer RAMs 18 and 18 in FIG.
It has the same function as, but it is 3x speed compatible. Loading motor 26, loading controller 24,
The digital signal processing circuit 7 has the same function as that of the embodiment shown in FIG. 9, but is compatible with triple speed.

Hereinafter, the control operation of the access control device 10 in FIG. 15 will be described with reference to FIG. Here, as shown in FIG. 4, the compact disk 1 sequentially stores the tracks [N], [N + 1], [N + 2], [N + 2], and [N +].
3], [N + 4],... Then, it is assumed that a certain song S1 is recorded after the [N] track and another song S2 is recorded after the [M] track.

FIG. 16 (a) shows the reproduction control from the [N] track when the compact disk 1 is rotating at a normal speed as in the conventional example. FIG. 16 (b) shows control during reproduction in this embodiment.

In this embodiment, the number of rotations of the compact disk 1 is three times the normal number, and as shown in FIG. 16 (b), between the time A and the time B, 12 tracks from the [N] track are reproduced. The seek is performed from time B to time C until the [M] track. From [M] track between time C and time D
12 tracks are reproduced, and [N +
12] Seek to track. From the point E to the point F, 12 tracks from the [N + 12] track are reproduced.
Similarly, the two songs S1 and S2 are alternately reproduced by 12 tracks.

Next, the control operation of the RAM control device 19 in FIG.
This will be described with reference to FIG.

In Figure 15, signals reproduced from Yotsute compact disc 1 to the access control shown in FIG. 16, a waveform shaping circuit 6 is processed by digital signal processing circuit 7, buffer RAM as triple-speed digital audio data A _D3 The data is supplied to the buffer RAMs 18A and 18B of the circuit 32.

FIG. 17 shows the input / output data of the buffer RAMs 18A and 18B. [N + i] and [M + j] are digital audio data reproduced from the [N + i] and [M + j] tracks of the compact disk 1, respectively. Show. (Input) is the 3x digital audio data A shown in FIG.
_D3 , (output) is the digital audio data A in FIG.
_DA and A _DB , respectively, the buffer RAMs 18A and 18B in FIG.
2 shows the input and output.

FIG. 17 (a) shows the input and output of the buffer RAM 18A. [N] of the reproduced data shown in FIG.
Only reproduced data of the song S1, recorded since track is input, is read at the normal speed as digital voice data A _DA. FIG. 17 (b) shows the input and output of the buffer RAM 18B. Of the reproduced data shown in Figure No. 16 (b), only the reproduced data of the song S2, recorded in the [M] after track is input, is read at the normal speed as digital voice data A _DB.

The playback data A _DA and A _DB of the buffer RAMs 18A and 18B are D
The signals are converted into analog signals by the / A conversion circuits 8A and 8B, and are simultaneously output from output terminals 9A and 9B, respectively.

Instead of using two buffer RAMs 18A and 18B, 1
The inside of each of the buffer RAMs may be divided into two areas, and the data of the music pieces S1 and S2 may be separately written and read in the respective areas.

This embodiment having the above-described configuration has an effect that two different songs can be simultaneously reproduced from one compact disk.

FIG. 18 is a block diagram showing still another embodiment of the disk reproducing apparatus according to the present invention having a recording function.
1 'is a compact disk, 17' is a data recording / reproducing unit,
33 is an input terminal, 34 is an A / D (analog / digital) conversion circuit, 35 is a buffer RAM circuit, 36 is a buffer RAM, 37 is a digital signal processing circuit, and 38 is a laser drive circuit, corresponding to FIG. The same reference numerals are given to the portions, and the duplicate description will be omitted.

In FIG. 18, a compact disk 1 'is a magneto-optical disk, which can be written and erased by magneto-optical recording. The disk format is the same as a normal music playback compact disk.

During recording, analog audio signal input from input terminal 33
A _IN is converted into a digital audio signal A _ID by an A / D conversion circuit 34. This digital audio signal A _ID is buffer RAM circuit 35
And read out as a triple speed digital audio signal A _ID3 at a triple transfer speed. Batuhua
The RAM circuit 35 is composed of the buffer RAMs 36 and 18, but one buffer RAM may be divided and used.

The triple speed digital audio signal A _ID3 is supplied to the digital signal processing circuit 37, where the addition of CIRC, the interleaving processing of CIRC, and the processing such as EFM modulation are performed, and the digital audio signal AID3 is supplied to the laser drive circuit 38 as a serial digital audio signal. The laser drive circuit 38 converts this digital audio signal into a change in the amount of laser light, and writes it on the compact disk 1 'by means of the optical pickup 4. The magnetic means is omitted.

Hereinafter, the control operation of the access control device 10 in FIG. 18 during the recording operation will be described with reference to FIG. However, here, as shown in FIG. 4, the tracks are [N], [N + 1], [N + 2], [N] on the compact disk 1 '.
+3], [N + 4],...

FIG. 19 (a) shows a control operation at the time of reproduction similar to the conventional example when the compact disk is rotating at a normal speed. FIG. 19 (b) shows a control operation during recording in this embodiment. In this embodiment, the number of rotations of the compact disk 1 'is three times the normal number.

In FIG. 19 (b), first, [N], [N
+1] is recorded, and at time A, the track jumps to the inner circumference by two tracks. Next, two tracks of [N] and [N + 1] just recorded during the period b are reproduced, and at the time point B, the track jumps inward by two tracks. Then, two tracks of [N + 2] and [N + 3] are recorded in the period c, and at time C, the track jumps to the inner circumference by two tracks. Next, two tracks of [N + 2] and [N + 3] just recorded in period d are reproduced. Thereafter, by repeating such an operation, an audio signal can be recorded on the compact disk 1 ', and at the same time, the audio signal can be reproduced.

Next, the control operation of the RAM control device 19 in FIG. 18 will be described with reference to FIG. However, in FIG.
i] indicates data from the track [N + i].
(Input) and (Output) are the buffer RAM circuit 3 respectively.
5 shows the input and output.

FIG. 20 (a) shows the digital audio signal A _ID (input) and the triple speed digital audio signal A _ID3 (output) of the recording buffer RAM 36. As shown
Digital audio data A _ID is input at normal speed, and digital audio data A _ID3 is output at triple speed.

Figure 20 (b) shows the digital audio data A _D is an a buffer RAM18 for playback (input) 3 and speed digital audio data A _D3 (output). As shown in the figure, the digital audio data _AD3 is input at a triple speed, and the digital audio data _AD is output at a normal speed. As described with reference to FIG. 19, in this embodiment, since the recording and the reproduction are performed in parallel, the operations of FIGS. 20 (a) and (b) are performed simultaneously.

In this embodiment having the above configuration, when recording audio data on a recordable compact disc,
At the same time, the recording result can be monitored.

FIG. 21 is a block diagram showing still another embodiment of the disk reproducing apparatus according to the present invention having a recording function.
A and 33B are input terminals, 34A and 34B are A / D converter circuits, 36A and 36B are buffer RAMs, and 39 is an adder circuit. The parts corresponding to those in FIG. I do.

In the figure, at the time of recording, the analog audio signal A _INA of the tune S1 and the analog audio signal A _INB of the tune S2 input from the input terminals 33A and 33B are digitized by A / D conversion circuits 34A and 34B, respectively. The data is taken into the RAMs 36A and 36B and alternately read as triple speed digital audio data, and is added to become triple speed digital audio data A _ID3 .

Hereinafter, the control operation of the access control device 10 in FIG. 21 during recording will be described with reference to FIG. However, here too
As shown in FIG. 4, tracks on the compact disk 1 'are [N], [N + 1], [N + 2], [N + 3],
[N + 4],... Also, it is assumed that the music S1 is recorded after the [N] track, and the music S2 is recorded after the [M] track.

FIG. 22 (a) shows the control at the time of reproduction in the conventional example in which the compact disk is rotating at the normal speed. FIG. 22 (b) shows the control during recording in this embodiment. In this embodiment, the rotational speed of the compact disk 1 'is
It is twice.

In FIG. 22 (b), first, [N]-
The tune S1 is recorded for 12 tracks of [N + 11] and seeks to the track [M] between the time points B and C. Next, the track S2 is recorded for 12 tracks of [M] to [M + 11] between the points C and D, and seeks to the track [N + 12] between the points D and E.
Then, the music S1 is recorded for 12 tracks of [N + 12] to [N + 23] between the time points E and F. Thereafter, songs S1 and S2 are alternately recorded in the same manner.

The control operation of the access control device 10 during reproduction is the same as in FIG.

Next, the control operation of the RAM control device 19 in FIG. 21 during recording will be described with reference to FIG.

FIG. 23 (a) shows the input and output of the buffer RAM 36A, and FIG. 23 (b) shows the input and output of the buffer RAM 36B. Here, [N + i] indicates data to be recorded in the [N + i] track, and [M + j] indicates data to be recorded in the [M + j] track.

As shown in FIGS. 23 (a) and 23 (b), the buffer RAM 36
A and 36B alternately output and synthesize triple speed digital audio data while inputting continuous digital audio data, and supply the data as triple speed digital audio data _AID3 to the digital signal processing circuit.

Next, the control operation of the RAM control device 19 in FIG. 21 during reproduction will be described with reference to FIG.

FIG (a) shows a triple-speed digital audio data A _D3 is an input buffer RAM 18, a drawing (b) one of the outputs A _DA of the buffer RAM 35, FIG. (C) is buffer RAM3
5 shows the other output A _DB . However, [N + i]
Is the data of the song S1 played from the [N + i] track,
[M + j] indicates data of the music piece S2 reproduced from the [M + j] track.

As shown in FIG. 24 (a), the triple speed digital audio data _AD3 is output from the digital signal processing circuit 7, and this digital audio data _AD3 is composed of alternating tracks S1 and S2 for every 12 tracks. It is arranged in. Buffer R
The AM 18 separates the digital audio data A _D3 into music S1 and music S2 as shown in FIGS. 24 (b) and 24 (c), and continuously separates them as digital audio data A _DA and A _DB , respectively. Output at the same speed. The outputs A _DA and A _DB of the buffer RAM 18 are added by an adder circuit 39 to become digital audio data _AD .
It is converted into an analog signal A _A in A conversion circuit 8.

In addition, in the adder circuit 39, the digital audio data A _DA , A
_DB may be added at an equal ratio, but the addition ratio may be changed, or one of the digital audio data A _DA and A _DB may be selectively output.

In this embodiment having the above-described structure, when recording audio data on a recordable compact disc, one of two recorded channels is recorded by recording synchronized audio information of two channels in separate areas. There is an effect that it is possible to reproduce only the two channels or to reproduce two channels simultaneously.

In FIGS. 9, 12, 15, 18, and 21, the control device 23 may be constituted by a single microcomputer.

[Effects of the Invention] As described above, according to the present invention, information is reproduced by rotating a disk-shaped recording medium at high speed, and the information is temporarily written to and read from the memory means. The recording medium can be exchanged while the reproduction information written in the storage medium is being read, and the output of the reproduction information is not interrupted even when the recording medium is exchanged.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a disk reproducing apparatus according to the present invention, FIG. 2 is a block diagram showing a specific example of a conversion circuit which can be used in place of the D / A conversion circuit in FIG. 1, and FIG. FIG. 4 is a block diagram showing a specific example of the digital signal processing circuit in FIG. 1, FIG. 4 is a track pattern diagram of a compact disk in FIG. 1, and FIGS. 5 and 6 are operations of the access control device in FIG. FIG. 7, FIG. 7 and FIG. 8 are explanatory diagrams of the operation of the RAM control device in FIG. 1, FIG. 9 is a block diagram showing an embodiment of the disk reproducing apparatus according to the present invention, and FIG. A block diagram showing a specific example of a digital signal processing circuit,
FIG. 11 is an explanatory diagram of the operation of the RAM control device in FIG. 9, and FIG.
FIG. 2 is a block diagram showing another embodiment of the disk reproducing apparatus according to the present invention, FIG. 13 is a diagram for explaining the operation of the RAM control device in FIG. 12, and FIG. 14 is a specific example of the digital audio adding circuit in FIG. FIG. 15 is a block diagram showing an example, FIG. 15 is a block diagram showing still another embodiment of the disk reproducing apparatus according to the present invention, FIG. 16 is an operation explanatory diagram of the access control device in FIG. 15, and FIG. , FIG. 18 is a block diagram showing still another embodiment of the disk reproducing apparatus according to the present invention, FIG. 19 is an operation explanatory view of the access control apparatus in FIG. 18, and FIG. FIG. 18 is a diagram for explaining the operation of the RAM control device in FIG. 18, and FIG. 21 is a block diagram showing still another embodiment of the disk reproducing device according to the present invention.
22 is an explanatory diagram of the operation of the access control device in FIG. 21 at the time of recording, FIG. 23 is an explanatory diagram of the operation of the RAM control device in FIG. 21 at the time of recording, and FIG. 24 is a diagram of the RAM control device in FIG. FIG. 25 is a block diagram showing an example of a conventional disk reproducing apparatus, and FIG. 26 is a block diagram showing a digital signal processing circuit in FIG. 25. 1,1 '... compact disk, 4 ... optical pickup, 7 ... digital signal processing circuit, 9 ... output terminal,
10 ... Access control device, 18,18A, 18B ... Buffer RAM,
19 RAM control device 23 Control device 24 Loading control device 25 Eject switch 26 Loading motor 27 Digital voice addition circuit 33 3
3A, 33B: Input terminal, 36, 36A, 36B: Buffer RAM, 37
…… Digital signal processing circuit, 38 …… Laser drive circuit.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayuki Hirabayashi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Home Appliance Research Laboratory, Hitachi, Ltd. (72) Inventor Nori Saito 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa (56) References JP-A-3-34156 (JP, A) JP-A-63-70966 (JP, A) JP-A-2-203469 (JP, A)

Claims (4)

(57) [Claims] 1. A disk-shaped recording medium in which a plurality of tracks are spirally connected is n times as fast as a normal speed at which information recorded on the recording medium can be reproduced at a specified transfer speed (where n is a positive number). Rotation means for rotating the recording medium, light irradiation means for irradiating the recording medium with light, irradiation position control means for controlling a light irradiation position on the recording medium, and reflection of the light irradiated on the recording medium. Disk reproducing means for reproducing information based on light; memory means for writing reproduction information output from the disk reproducing means; memory control means for reading the reproduction information written in the memory means; A recording medium for reproducing information by the disc reproducing means with another recording medium in accordance with at least one of the end of reproduction of the information from the disc and an instruction to discharge the recording medium. The irradiation position control unit sequentially changes the irradiation position of the light on the recording medium along the track according to whether or not the reproduction information is filled in the memory unit. The first mode of controlling the light irradiation means to move the light and the operation of returning the light irradiation position on the recording medium by one track each time the disk reproducing means reproduces information of one track (n
-1) selecting a second mode in which the light irradiation means is controlled so as to be repeated a number of times, and in a period in which the recording medium for reproducing information by the disc reproducing means by the loading means is replaced with the another recording medium, 2. A disk reproducing apparatus according to claim 1, wherein said memory control means reads said reproduction information from said memory means. 2. A rotating means for rotating a disk-shaped recording medium in which a plurality of tracks are spirally connected to each other at a speed higher than a normal speed at which information recorded on the recording medium can be reproduced at a prescribed transfer speed; Light irradiation means for irradiating the recording medium with light; irradiation position control means for controlling a light irradiation position on the recording medium; and disk reproduction for reproducing information based on the reflected light of the light irradiated on the recording medium. Means, memory means for writing the reproduction information output from the disk reproducing means, memory control means for reading the reproduction information written to the memory means, completion of reproduction of the information from the recording medium, and recording Loading means for exchanging a recording medium for reproducing information by the disc reproducing means with another recording medium in accordance with at least one of the instructions for ejecting the medium. The irradiation position control means controls the light irradiation so as to sequentially move the irradiation position of the light on the recording medium along the track according to whether or not the reproduction information is filled in the memory means. A first mode for controlling the means and a second mode for controlling the light irradiation means so as to return the light irradiation position on the recording medium each time the disc reproducing means reproduces a predetermined amount of information. Wherein the memory control means reads out the reproduction information from the memory means even during a period when the recording medium for reproducing information by the disc reproducing means by the loading means is replaced with another recording medium. Disk playback device. 3. A rotating means for rotating a disk-shaped recording medium in which a plurality of tracks are spirally connected to each other at a speed higher than a normal speed at which information recorded on the recording medium can be reproduced at a specified transfer speed; Light irradiation means for irradiating the recording medium with light; irradiation position control means for controlling a light irradiation position on the recording medium; and disk reproduction for reproducing information based on the reflected light of the light irradiated on the recording medium. Means, memory means for writing the reproduction information output from the disk reproducing means, memory control means for reading the reproduction information written to the memory means, completion of reproduction of the information from the recording medium, and recording Loading means for exchanging a recording medium for reproducing information by the disc reproducing means with another recording medium in accordance with at least one of the instructions for ejecting the medium. The irradiation position control means controls the light irradiation so as to sequentially move the irradiation position of the light on the recording medium along the track according to whether or not the reproduction information is filled in the memory means. A first mode for controlling the means and a second mode for controlling the light irradiating means so as to repeat the information reproducing operation by the disk reproducing means and the operation of returning the light irradiation position to the recording medium. And wherein the memory control means reads the reproduction information from the memory means even during a period when the recording medium for reproducing the information by the disc reproducing means by the loading means is replaced with the another recording medium. Disc playback device. 4. The transfer rate according to claim 1, 2 or 3, wherein said memory control means has a transfer rate equal to a transfer rate of reproduction information output from said disk reproduction means when said recording medium is rotated at said normal speed. Reading the reproduction information from the memory means.