JPH0785569A - Recording medium performance device - Google Patents

Abstract

PURPOSE:To freely set the ratio of a speed for ordinary reproduction and a speed for a search action by the contents of information recorded on a disk or by selection of a user by providing a CPU with a function to make search action at an arbitrary speed. CONSTITUTION:A pickup (P, U) 3 obtains a reading signal from the disk 1. A signal processing circuit 8 which receives this reading signal executes signal processing and outputs a reproduced signal. A memory 9 stores the data of this reproduced signal. An audio amplifier 14 and speaker 15 constituting an sound output means transmits sounds according to the reproduced signal. The CPU 16 controlling the entire part of the device determines divided information to reproduce sound production according to the selected and set search speed upon reception of the instruction for retrieval and reproduction. The P, U 3 is made to execute tracking action and track movement, by which the data on only the divided information relating to the reproduction of the sound production is written into the memory 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an MD (mini disc) in which a series of information is recorded in a spiral track in time series.
The present invention relates to a recording medium playing device that plays back and reproduces the information.

[0002]

2. Description of the Related Art In a CD player, MD player or the like which is a recording medium playing device, when playing a disc on which information such as music pieces is recorded, one piece of music is played continuously from the beginning to the end. In addition to the normal reproduction for reproducing the music information, the pickup can jump the adjacent track or several tracks from the track currently being reproduced to perform a search operation, which is a search reproduction for intermittently reproducing, that is, intermittently.

As such a conventional technique, there is disclosed in Japanese Patent Laid-Open No. 58-2.
No. 12659 ”discloses a technique in which a pickup is moved for a specific time and then a normal playback mode for a certain time is entered. Therefore, the user can search for the target information in a short time while listening to the information reproduced intermittently.

[0004]

However, in the above-mentioned conventional technique, since the number of tracks to jump is set, the speed of the normal reproduction and the speed of the search operation have a fixed magnification relationship, and the speed of the normal reproduction is arbitrary. Could not be reproduced at a magnification of.

FIG. 4 is a diagram showing how a track jump occurs during a search operation in a conventional recording medium playing device. FIG. 4A is a diagram showing information recorded on the disc. This disk has a constant linear velocity CLV (Constan
t Linear Velocity) disk, and the length of a sector (or frame), which is division information obtained by dividing a series of information in time series by a predetermined amount of information, is constant. Therefore, the number of sectors on the circumference is different between the outer circumference and the inner circumference of the recording area of the disc, and the rotation speed of the disc is faster when the inner circumference is reproduced than when the outer circumference is reproduced.
However, between tracks adjacent to each other or between tracks near each other, the sectors are almost parallel to each other.

In FIG. 4 (a), the spiral track has music information divided into a plurality of sectors for each predetermined information amount, that is, for each predetermined recording length. In this case, one track is assumed to be divided into eight sectors. In the case of normal reproduction, if the current sector being reproduced is S0, the sector to be reproduced next is S1, and reproduction is performed in the order of S2, S3, S4, .... On the other hand, in the case of the search operation, if the current sector being reproduced is S0, the pickup jumps to the adjacent track, and the sector to be reproduced next is S9, as shown by the dotted line in the figure, and the sector is reproduced next. The sector becomes S18. That is, in the case of the search operation, the sectors indicated by the thick lines in the figure are reproduced in a scattered manner.

FIG. 4B is a diagram comparing the sector order in the normal reproduction with the sector order in the search operation. In the search operation, unlike the random access, the jumping tracks are adjacent tracks or at most a few tracks.Therefore, the number of sectors of one track in the currently playing track and the jump destination track is almost the same. It is the same.

Therefore, if the number of sectors in one track is k (8 in the case of FIG. 4), the reproduction speed ratio in the normal reproduction in the search operation is fixed to an integral multiple of k + 1. .

By the way, since the search operation is performed in order to recognize the content of the reproduced music as quickly as possible,
Originally, the search speed should be determined based on a person's identification ability. However, as mentioned above, the search operation is conventionally the repetition of the operations of "play" → "track jump" → "play" → "track jump" → ..., and the playback speed ratio is fixed, so the search operation is optimal. There was a problem that it could not be done at a reasonable speed.

The present invention solves such a conventional problem, and provides an excellent recording medium playing device capable of setting the ratio of the speed of normal reproduction and the speed of search operation to an arbitrary value. The purpose is to

[0011]

In order to achieve the above-mentioned object, the present invention divides a series of information into a predetermined amount of information in time series to obtain division information including unique identification information for each division, and to form a spiral. Reading means for irradiating the disc with a light beam to read the recorded information to obtain a read signal in a recording medium playing device for playing the disc recorded on a circular track and reproducing the information. Signal processing means for obtaining a reproduction signal of the information by applying predetermined signal processing to
A memory for storing the data of the reproduced signal from the signal processing means, a memory control means for controlling the writing of the data to the memory and the reading of the data stored in the memory, and a memory control means for controlling the data read from the memory. Audio output means for transmitting sound, a reading drive means for carrying the reading means in the radial direction of the disc and performing a tracking operation for causing the reading means to follow the track, and information recorded on the disc. Operating means for setting inputs of a reproduction command for normal reproduction and a search reproduction command for intermittent reproduction, and, when receiving the search reproduction command, division information for reproducing sound according to a predetermined search reproduction speed. The reading means, the tracking operation and the track movement are performed, and the data of only the division information related to the sound reproduction is recorded. And control means for controlling writing to memory, and further comprising a.

[0012]

Therefore, according to the present invention, the speed ratio between the normal reproduction and the search reproduction can be freely set.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a recording medium playing device of the present invention. In the figure, reference numeral 1 is a mini disc (MD; hereinafter simply referred to as "disc") on which information such as music pieces is recorded. The disc 1 is recorded with clock information for speed control and address information indicating the position of recording information. Reference numeral 2 is a spindle motor for rotating the disk 1. Reference numeral 3 denotes a pickup (PU) as a reading unit that irradiates the rotating disk 1 with a light beam, receives a reflected light beam to read the recorded information, and sends a read signal. Reference numerals 4 and 5 are drivers for driving the spindle motor 2 and the pickup 3, respectively.

An RF amplifier 6 amplifies a high-frequency read signal sent from the pickup 3, converts the waveform into a binarized signal and detects a focus error signal and a tracking error signal. Reference numeral 7 denotes a servo processing circuit, which drives the driver 5 by a focus error signal or a tracking error signal obtained from the RF amplifier 6 to perform focus control or tracking control of the pickup 3 and a disc of the pickup 3 by a control signal from a CPU described later. Controls radial movement or access. Driver 5 and servo processing circuit 7
Thus, the reading drive means for carrying the pickup 3 in the radial direction of the disk 1 and performing the tracking operation to follow the track is configured. The servo processing circuit 7 also supplies a drive signal to the driver 4.

Reference numeral 8 is a signal processing circuit for subjecting the binarized signal obtained from the RF amplifier 6 to predetermined signal processing such as EFM demodulation and error correction and sending it as 1.4 Mbps data. Also, a control signal for controlling the speed of the spindle motor 2 is supplied to the servo processing circuit 7 based on the clock information included in the binarized signal. 9 is 4 Mbit D
A memory 10 composed of a RAM is a memory controller which writes 1.4 Mbps data from the signal processing circuit 8 to the memory 9 and reads the written data at 0.3 Mbps which is about ⅕ the speed at the time of writing. Is.

Reference numeral 11 is 0.3M read from the memory 9.
bps data, MD system specific ATRAC (A
This is an encoder / decoder circuit peculiar to the MD system for performing band compression / expansion of the daptive Transform Acoustic Coding) system. Of course, the decoder circuit operates in the case of reproduction, and the encoder circuit operates in the case of recording. 1
Reference numeral 2 denotes a digital filter (DF) that performs oversampling processing on the band-expanded 1.4 Mbps data sent from the encoder / decoder circuit 11 to separate the folding frequency component from the upper limit of the audio signal and to perform various acoustic corrections. ).

Reference numeral 13 is a D / A converter (DAC) which converts the digital signal from the digital filter 12 into an analog signal. Although not shown in the figure, this D
An analog low pass filter is inserted after the / A converter 13 to remove high frequency components due to oversampling. Reference numeral 14 is an audio amplifier for amplifying an audio signal obtained from the D / A converter 13 (actually obtained from an analog low pass filter). Reference numeral 15 denotes a speaker that receives the audio signal amplified by the audio amplifier 14 and emits audio. The audio amplifier 14 and the speaker 15 constitute audio output means.

Reference numeral 16 is a CPU as a control means for controlling the entire apparatus. While the CPU 16 performs the reproducing operation of the disc 1, it discards a predetermined sector of the data sent from the signal processing circuit 8 without writing it in the memory 9, and reads and reproduces only the written data. As a result, the search operation can be performed at an arbitrary speed as described later with reference to FIG. 17 is the CPU 1
A display driver that receives display data from 6 and sends a display drive signal, and a display 18 that displays a necessary message or the like according to the display drive signal.

Reference numeral 19 is a key input as an operation means for inputting a reproduction command for normal reproduction, a search command for performing a search operation for intermittently reproducing a target music, and a command for accessing a designated music. It is a department. Further, the speed of the search operation can be set from the key input unit 19, and an arbitrary speed can be set with respect to the speed of the normal reproduction to freely set the interval at which the pickup 2 jumps.

Next, the control for performing the search operation in the configuration of FIG. 1 will be described based on the operation flowchart of the CPU 16 shown in FIG. In this figure, the key input unit 19 is monitored to determine whether or not it is a search. If it is a search, the search speed set by the key input unit 19 is read (step 101). Based on the read search speed, the number m of unit division information (in this case, sector) for mute-on reproduction and the number n of tracks to jump are calculated and determined (step 102). For example, when the search speed is set to 6.5 times that of normal reproduction, a combination of the number of mute-on reproduction sectors and the number of jump tracks for realizing the speed is calculated.

According to this determination, the memory controller 1
Memory write stop processing for sending a memory write stop command to 0 is performed (step 103), and it is determined whether or not m write stop sectors have ended (step 104). When the write stop process for the m sectors is completed, the memory write process is performed for the next sector (l or a plurality of sectors) (step S10).
5). In this case, the mute-on reproduction can be performed without the interruption of the sound from the speaker 15 due to the difference in the speed of writing and reading the data in the memory 9. That is, the user can continuously hear only the sectors for intermittent sound reproduction, and can effectively use the characteristics of the MD system.

When the sound reproduction is completed, the tracking is turned off (step 106), a track jump is performed (step 107), and it is determined whether or not the number of jumped tracks is n (step 108). When n track jumps are completed, the tracking is turned on (step 109), and the memory writing process is performed on the next sector (one or more sectors) (step 11).
0). Then, it is determined whether or not the search is being performed by monitoring the search key of the key input unit 19 (step 111). If the search key is being pressed, that is, the search is in progress, the process proceeds to step 103 and the search key is not pressed. The processes up to step 110 are repeatedly executed until the end.

FIG. 3 is a diagram showing how a track jump occurs during a search operation in the recording medium playing device of the present invention. FIG. 4A is a diagram showing information recorded on the disc. This disk, like the conventional example, has a constant linear velocity C
Sector (or frame) which is an LV disc and is division information obtained by dividing a series of information in time series by a predetermined amount of information
Has a constant length. Further, between adjacent tracks or between adjacent tracks, the sectors exist almost in parallel.

In FIG. 4A, one track is divided into, for example, eight sectors, and in the case of search, if the current sector being reproduced is S0, the sectors S1, S2 and Data write stop processing from S3 is performed, tracking is turned off, the pickup 2 is jumped to an adjacent track, and data write processing from the sector S13 is performed. After that, the data write stop processing is performed with the sectors S14, S15 and S16, and the sector to which the data write processing is performed next is S
It becomes 17.

FIG. 4B is a diagram comparing the sector order in the normal reproduction with the sector order in the search operation of the present invention. As shown in this figure, the sectors to be reproduced with sound are S0, S4, S13, S17, S26 ... And a search speed of 26/4 on average, or 6.5 times, can be realized as compared with the case of normal reproduction. it can. In this case, the values of m = 3 and n = 1 are determined by the calculation of the CPU 16.

It is also possible to perform sound reproduction for each fixed sector. In this case, when performing the search operation at a pitch smaller than the number of sectors of one track, a combination of mute-on reproduction (data writing stop processing) and sound reproduction (data writing processing) is performed without performing track jump. When the search operation is performed and the search operation is performed at a pitch equal to or greater than the number of sectors of one track, the sound reproduction in step 105 of FIG. 2 is not performed, and the combination of the mute on reproduction and the sound reproduction after the track jump is performed. Perform a search operation.

Further, the speed of the search operation is determined by the key input unit 19
From the above, the configuration is set by the user's operation, but a configuration fixed in advance by a program or the like in the apparatus is also possible.

[0029]

As is apparent from the above-described embodiments, the present invention performs search reproduction at an arbitrary speed with respect to normal reproduction speed by combining sound reproduction, mute-on reproduction without sound, and track jump. be able to.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a recording medium playing device of the present invention.

FIG. 2 is an operation flowchart of a CPU shown in FIG.

FIG. 3 is a diagram showing a state of a track jump during a search operation in the recording medium playing device of the present invention.

FIG. 4 is a diagram showing how a track jump occurs during a search operation in a conventional recording medium playing device.

[Explanation of symbols]

 1 disk 3 pickup (reading means) 5 driver (reading drive means) 8 signal processing circuit 9 memory 10 memory controller (memory control means) 14 audio amplifier 16 CPU (control means)

Claims (3)

[Claims] 1. A series of information is time-sequentially divided by a predetermined amount of information to obtain division information including unique identification information for each division, and the information is reproduced by playing a disc recorded on a spiral track. A recording medium playing device for reproducing, wherein the reading means for irradiating the disc with a light beam to read the recorded information to obtain a read signal, and a read signal for the information by subjecting the read signal to predetermined signal processing. And a memory for storing the data of the reproduction signal from the signal processing means, a memory control means for controlling writing of data to the memory and reading of the data stored in the memory, and Audio output means for outputting audio in response to a reproduction signal based on the read data, and the reading means for carrying the reading means in the radial direction of the disk. Read driving means for performing a tracking operation to make the track follow the track, operation means for setting an input of a reproduction command for normally reproducing the information recorded on the disk, and an input of a search reproduction command for intermittently reproducing the information, When the reproduction command is received, the division information to be reproduced with sound is determined according to a predetermined search and reproduction speed, and the reading means is caused to perform the tracking operation and the track movement.
A recording medium playing device, comprising: a control unit that controls writing of data of only division information relating to the sound reproduction to the memory. 2. The control unit according to claim 1, wherein the read driving unit stops the tracking operation, causes the reading unit to move a track, and causes the read driving unit to perform the tracking operation to write data to the memory. A recording medium playing device characterized in that the control of the sound transmission is performed by writing or stopping writing. 3. The recording medium playing device according to claim 1, wherein the operating means is capable of arbitrarily adjusting the search / playback speed.