JP4603686B2 - Disc player for playing a disc having optically stored data - Google Patents

Description

[0001]
The invention starts from a disc player according to the superordinate concept of claim 1.
[0002]
From EP 0 626 690 A1, a digital performance device for an audio disc is known. In this device, digital audio data is written into the memory at a speed faster than or equal to the normal playback speed. Data is read from this memory at normal playback speed. In this way, it is possible to reproduce two consecutive music songs without pause. Further, a fading control unit is provided, and this unit performs volume control at the time of transition of two music pieces to be played successively.
[0003]
From EP 0 249 781 A1, a compact disc (CD) player for playing so-called CD discs is known. This player is provided with a write / read memory for intermediate storage of data in order to electronically compensate for the jumping of the track due to vibrations or disturbances in the digital data processing path of the signal processing unit. It has been. Data is continuously read from the memory, where the reading process continues continuously even when the track of the scanning optical system is lost. The repositioning device resets the scanning optics again after the track jump, while the synchronizer synchronizes the start of the memory writing process after the repositioning of the scanning optics with the end of the memory writing process before the track jumping. After track jumping, the memory is rapidly refilled with scanned and processed digital data. As a result, the memory is again filled with sufficient read data for the next jumping of the track that occurs in some cases, and the continuity of the reading process can be guaranteed even during the jumping of the track. If a sufficiently large amount of data is stored, the write frequency is again reduced to the old value. The memory read frequency remains constant.
[0004]
Advantages of the Invention On the other hand, the disc player of the present invention having the features of claim 1 realizes a sequential partial performance of music songs stored on the disc even when a track jump that is not repositioned synchronously is performed. Therefore, there is an advantage that continuous reading of the writing / reading memory is possible. In this way, high-speed skipping of the disc is realized, and the high-speed skip allows the user to obtain an overview of the music tune without being disturbed by listening to it, and can select it.
[0005]
By means of the dependent claims, advantageous improvements and developments of the disc player according to claim 1 are possible.
[0006]
According to claim 2, advantageously, a jump time is provided , during which the scanning optical system performs a track jump. This makes it possible to skip the disc at a high speed in a predetermined manner, thereby reproducing an overview of the music songs present on the disc.
[0007]
According to claim 3, advantageously, a sufficiently large amount of data is stored in the write / read memory at the first clock rate, so that the data at the second clock rate can be stored during the duration of the jump. Guarantees regeneration. Thus, the user track jump is not perceived as interruption of reproduction.
[0008]
According to claim 4, a control unit is preferably used. The control unit is supplied with a first clock rate, and the control unit supplies a second clock rate to the write / read memory, the address of the data to be output, and the address of the data to be read and scanned. A servo unit is connected to control the optical system depending on the first clock rate. In this way, a track jump to a predetermined track position is possible, and the data stored in the write / read memory can be efficiently managed especially for the write and read processes. The clock rate is controlled to ensure a continuous playback process without interruption.
[0009]
According to claims 5 to 7, the evaluation of the data is advantageously performed by the evaluation unit for volume, time signature, audible frequency, etc., which is connected to the control unit. Thereby, a predetermined volume, a predetermined time signature, a predetermined audible frequency, etc. can be maintained. In this way, sequences of data that are sequentially arranged and acoustically reproduced are musically matched to each other and thus do not disturb the user's enjoyment of listening.
[0010]
Drawings Embodiments of the invention are shown in the drawings and are described in detail below. FIG. 1 shows a circuit device of a disc player according to the present invention.
[0011]
FIG. 1 shows a scanning optical system of a disc player configured as a CD player by 5, and this scanning optical system forms a control circuit together with a servo unit 15. Data read from the disk in which the scanning optical system 5 is configured as a compact disk is decoded by the decoder 25. Here, the data is optically digitally stored in the track of the compact disc, and the decoder 25 has a first output side 30 for outputting data and a second output side for outputting the first clock rate. 35. The first output side 30 of the decoder 25 is connected to the first input side 31 of the write / read memory 1 for data input, and the second output side 35 of the decoder 35 is connected to the first input side 31 of the write / read memory 1. Two input sides 36 are connected to input a first clock. Read / write memory 1 has a data output 85 for outputting data, the data is audible as known. The second output side 35 of the decoder 25 is further connected to the first input side 40 of the control unit 10 for input of a first clock rate.
[0012]
The control unit 10 has a first output side 45, which outputs the address for the data to be read into the first input side 31 by the write / read memory 1. The control unit 10 further has a second output side 50 which outputs an address for the data to be read on the data output side 85 of the write / read memory 1. The control unit further has a third output side 55, which outputs the second clock rate to the write / read memory. The first output side 45 of the control unit 10 is connected to the third input side 70 of the write / read memory 1 for outputting an address for the data to be read. The second output side 50 of the control unit 10 is connected to the fourth input side 75 of the write / read memory 1 to output an address for the data to be read. The third output side 55 of the control unit 10 is connected to the fifth input side 80 of the write / read memory 1 for outputting a second clock rate. Data is further supplied from the first output 30 of the decoder 25 to the evaluation unit 20, which is further connected to the second input 60 of the control unit 10 for outputting the data evaluation. The control unit 10 is finally connected to the servo unit 15 in order to output a control signal via the fourth output side 65.
[0013]
With the CD player of the present invention having the circuit device shown in FIG. 1, it is possible to operate in such a manner that music tunes stored on a compact disc are successively and partially reproduced according to the performance plan shown in FIG. . If this mode of operation is selected by the user, the scanning optical system is positioned at the program point 200, for example, at a location that marks the start of the first music piece.
[0014]
Next, at the program point 205, the write / read memory 1 is optically and digitally stored in the track of the compact disc with the address for the data to be read output from the control unit 10 to the write / read memory 1 as a starting point. The data read by the scanning optical system 5 and decoded by the decoder 25 are loaded in the form of data blocks.
[0015]
After each memory space is used by the program point 205, it is checked whether the write / read memory 1 is full. If it is full, the program branches to program point 215. Otherwise, return branch to program point 205 and continue the loading process.
[0016]
At the program point 215, the control unit 10 outputs a valid address for the data to be read out to the write / read memory 1. This address corresponds to the start of the address for the data that is read first. In this way, after the write / read memory 1 is full, data representing the start of the first music tune is first output to the data output side 85 of the write / read memory 1 as is well known. It is audible. This is done at the second clock rate.
[0017]
The second clock rate is output from the control unit 10 to the write / read memory 1 in the same way at the program point 220, and this second clock rate is constant. Next, data is read from the write / read memory 1 until the end of the program or sequential partial reproduction at the second clock rate. Loading of the write / read memory 1 is performed at a first clock rate, and this first clock rate is variable.
[0018]
To form the first and second clocks, a crystal oscillator (not shown) is used. Similarly, this crystal oscillator is connected to a first frequency divider (not shown) having a fixed frequency division ratio to form a second clock. Further, the crystal oscillator can be similarly connected to a second frequency divider (not shown), and the frequency division ratio of the second frequency divider can be variably adjusted by the control unit 10. A variable first clock rate or a constant second clock rate is obtained from the output side of each frequency divider.
[0019]
Depending on the first clock rate supplied to the control unit 10 via the first input 40, the servo unit 15 is controlled as follows. In other words, the scanning frequency of the compact disk and the speed of the disk are controlled to be adapted to the first clock rate accordingly.
[0020]
It is advantageous to use a first clock rate greater than the second clock rate in the initial writing process of the write / read memory 1 for reasons of time saving. In this way, the scanning frequency and disc speed of the compact disc are increased correspondingly as well.
[0021]
Since the first clock rate and the memory capacity of the write / read memory 1 are known by the control unit 10, the write / read memory 1 is completely full and the address of the data to be read is the first read data. The point in time to be equal to the address is also known. Therefore, the inquiry about the fullness of the write / read memory 1 at the program point 210 can be realized as a time inquiry.
[0022]
Next, at program point 225, the first clock rate is adapted to the second clock rate, and at program point 230, the scanning frequency and disk speed of the compact disk are correspondingly reduced by control of servo unit 15 by control unit 10. The Next, new data is overwritten in the write / read memory 1 by outputting old data from the data output side 85. In this way, the entire memory contents of the write / read memory 1 can be obtained at a constant second clock rate during track jumping for continuous reading. As a result, the maximum duration for track jumping can be set by the second clock rate and the size of the write / read memory 1. However, the premise is that the jumping track does not affect the enjoyment of listening. The condition for executing the track jump from the control unit 10 side is that the write / read memory 1 is completely filled with data .
[0023]
In the control unit 10 in the program point 235, whether to execute the track jump is examined. If so, the program branches to program point 240; otherwise, it branches to program point 255. At the program point 240, the servo unit 15 receives a corresponding control signal from the control unit, whereby the scanning optical system is positioned at the next location to be read. During track jumping, the data stored in the write / read memory 1 is further read at a constant second clock rate, so that listening enjoyment is not impaired.
[0024]
The control unit 10 records the duration of the track jump at the program point 245 and detects the filling state of the write / read memory 1 therefrom after the end of the track jump. When the track jump ends, the first clock rate is increased at program point 250. As a result, the first clock rate becomes higher than the second clock rate, and the write / read memory 1 can be filled again. The scanning frequency and disk speed of the compact disk are increased correspondingly at program point 250 as well.
[0025]
At program point 260, it is checked whether the write / read memory 1 has been completely filled again. If it is completely filled, it branches to program point 265, otherwise it branches to program point 250 and is further processed with an increased clock rate. If the write / read memory 1 is completely filled again, the first clock rate is set to the value of the second clock rate at the program point 265 and branches to the program point 230. Here, the scanning frequency of the compact disc and the disc speed are adapted accordingly.
[0026]
At program point 255 it is checked whether the end of the track on the compact disc has been reached. If so, the program ends, otherwise it branches to the program point 230 and the servo unit 15 is further controlled by the control unit 10 accordingly.
[0027]
The track jump free normal operation, the address of the data to be read is adapted constantly first read address of the data is periodically follow the address of the data to be read out the address of the data to writing. This is done, for example, by adapting the address to the address of the last read data. In this way, the write / read memory 1 is efficiently managed by the control unit 10.
[0028]
During the track jump, the control unit 10 does not output the address for the data to be read to the write / read memory 1. Therefore, new data cannot be stored in the write / read 1 during this track jump .
[0029]
After the track jump is completed, or after the time obtained is completed with respect to this, the control unit 10 newly outputs an address for to writing data to the write / read memory 1, thereby a new data Data can be written from the decoder 25 to the write / read memory 1. Here realm of the previous row is included can already read written during the track jumping / read memory 1 is addressed with respect to written data. Thus, for addressing the type described above, if it is filled write / read memory 1 again, is set to the address of the address for to written data was last read by the control unit 10 data.
[0030]
Means for performing a predetermined track jump are realized by using the evaluation unit 20. The evaluation unit 20 is similarly supplied with data supplied to the write / read memory 1. Here, the evaluation unit 20 evaluates the music piece data in terms of volume, time signature, audible frequency, and the like. Depending on the evaluation of the data by the evaluation unit 20, the control unit 10 outputs a jump command to the servo unit 15 and a corresponding track jump of the scanning optical system 15 is executed at the program point 240. Thereby, a predetermined volume, a predetermined time signature, a predetermined audible frequency, etc. can be maintained.
[0031]
This can also be performed as follows. That is, as shown in the figure, a switch 85 is arranged on the data output side 85 of the write / read memory 1, and this switch is connected to the switch control output side 95 of the control unit 10 via the control line 100. One data output 85 is selectively connected to a digital / analog converter (not shown) to further process the data or to the evaluation unit 20. Control unit 10 in this way, also controls that were stored in the write / read memory 1 data evaluation unit 20 for evaluating, depending on the evaluation of the data in the evaluation unit 20, a predetermined volume, predetermined The address of the write / read memory 1 in which data such as time signature and predetermined reproduction frequency are stored can be obtained. This address is then transmitted to the write / read memory 1 as a read address via the fourth input side 75. This eliminates the need for track jumping, and the load on the scanning optical system 5 is significantly reduced. In this case, the address jump in the write / read memory 1 is performed instead of the track jump at the program point 240, and the jump is performed in the write / read memory 1 instead of the detection of the track jump duration at the program point 245. The effective filling state of the write / read memory 1 is detected by detecting the number of remaining memory spaces. In order to prevent data loss in an analog / digital converter (not shown), the input data is buffered accordingly behind the switch 90.
[0032]
Data characteristics can be taken into account by separating the data reproduction process and the reading process from the compact disc. In this way to the noisy music songs from quiet music song in, to the high point of the regeneration frequency from a low reproduction frequency point, to jump directly from the slowly places in the time signature to the fast beat point, it is impaired fun Mi listen Is blocked.
[0033]
The control unit 10 can also use the evaluation unit 20 to jump to the beginning of the subsequent music piece.
[0034]
If the jump time is reasonably small, it is not always necessary to completely fill the write / read memory 1. This can reduce the time between two track jumps. This is because it is not necessary to completely fill the write / read memory 1 after one track jump.
[0035]
The disc player of the present invention not only leads to the jumping of the tracks necessary for sequentially performing partial performances of music songs stored on the disc, but also avoids track loss caused by, for example, vibration or failure of the servo unit 15. The The correct track position can be adjusted again by means of a suitable repositioning device provided accordingly.
[Brief description of the drawings]
FIG. 1 is a block circuit diagram of an embodiment of the present invention.
FIG. 2 is a flowchart of the method of the present invention.

Claims (7)

A disc player for playing a disc having optically stored data, wherein information is stored digitally on a track, and the disc player is a write / read memory (1) for intermediate storage of data blocks The data block is read into the write / read memory (1) at a first clock rate, read from the write / read memory (1) at a second clock rate, and the first clock rate is Greater than 2 clock rate,
In a disc player provided with an operation format in which music songs stored on a disc are sequentially and partially played,
An evaluation unit (20) is provided,
The evaluation unit evaluates the data of music pieces to be played successively in sequence with respect to volume, time signature, and reproduction frequency,
Depending on the evaluation of the data, perform address jumps in the write / read memory (1),
As a result, when the music tunes stored on the disc are successively and partially played, the predetermined volume, the predetermined time signature, and the predetermined reproduction frequency are maintained.
A disc player characterized by the above.   2. A disc player according to claim 1, wherein a jumping time for the scanning optical system to execute track jumping is provided.   3. A sufficiently large amount of data can be stored in the write / read memory (1) by means of the first clock rate, which ensures that the data is reproduced at the second clock rate during the jump time. Disc player as described. A control unit (10) is provided,
The control unit is supplied with a first clock rate,
The control unit supplies the write / read memory (1) with the second clock rate, the address of the data to be output, the address of the data to be read,
The control unit (10) is connected to the servo unit (15),
4. The disc player according to claim 1, wherein the servo unit controls the scanning optical system (5) depending on the first clock rate. The data supplied to the write / read memory (1) is further supplied to the evaluation unit (20) to evaluate the data for volume, time signature and playback frequency,
The disc player according to any one of claims 1 to 4, wherein the evaluation unit (20) is connected to a control unit (10).   The control unit (10) outputs a jump command to the servo unit (15) depending on the evaluation of the data by the evaluation unit (20), and the corresponding track jump of the scanning optical system (5) is performed by the jump command. 6. A disc player according to claim 1, wherein a predetermined volume, a predetermined time signature, and a predetermined reproduction frequency are maintained.   The control unit (10) depends on the evaluation of the data by the evaluation unit (20), and the write / read memory (1) stores data for maintaining a predetermined volume, a predetermined time signature, and a predetermined reproduction frequency. The disc player according to claim 1, wherein the disc player detects an address.

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