JPH03273586A - Information reproducing device - Google Patents

Abstract

PURPOSE:To eliminate a null time with the aid of a small-sized and inexpensive means by temporarily accumulating recording information read out at a high speed into a memory at a high speed, and reading out the information from the memory and reproducing it at an ordinary speed during the null time such as searching time. CONSTITUTION:In an information reproducing device which reads out, reproduces and outputs the recording information from a recording medium 1, where plural pieces of recording information are recorded by taking a proper spacing time one another, at a specified reproducing speed, the recording information is read out from the single recording medium 1 by a 1st means 2 at the higher speed than the specified reproducing speed based on the time necessary for reproducing the recording information which should be reproduced and the spacing time, and stored in the memory 3 at the high speed. The information stored in the memory 3 is read out at a constant speed by a 2nd means and outputted as reproducing data. Thus, the small-sized and inexpensive information reproducing device where the null time is eliminated is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to CD (compact disc) players, DA
The present invention relates to an information reproducing apparatus such as a digital audio recorder (T), and particularly to an information reproducing apparatus suitable for continuously reproducing recorded information from one recording medium or a plurality of recording media.

[Conventional technology]

When continuously playing a plurality of CDs, an autochanger is often used, which automatically changes CDs in the order of the playback program and plays them continuously. When two CDs are played back consecutively using a general autochanger, as shown in FIG. It takes time CT to exchange the data and time CT to search for the next piece to be performed.

This replacement search time CT takes, for example, 8 seconds, which is audibly a blank time (no sound time), but it is not preferable if this blank time is too long. Also, this blank time is
It becomes an obstacle when dubbing from to audio tape.
To remove this blank time on the tape, for example, a synchronized deck was used.

As a means to eliminate such blank time audibly, for example,
As shown in FIG. 14, two first and second reproduction means M
, prepare M2, and the first regenerator! While the stage M is being driven, the second reproducing means M2 is operated in parallel in advance to standby state, and the first reproducing means M1
Immediately after the previous CD 5X has finished playing, the next CD
52 may be started.

The above-mentioned blank time when playing a CD occurs not only in an autochanger but also when searching for the next performance piece within a single CD.

[Problem to be solved by the invention]

However, the solution using two autochangers requires two sets of regeneration mechanisms, spindle motors, servo circuits, etc., which increases the size and cost of the device.
Undesirable.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a compact and inexpensive information reproducing apparatus that eliminates blank time when continuously reproducing a plurality of recorded information and a plurality of recording media including non-reproduced output portions.

[Means to solve the problem]

A block diagram of the principle of the claim for solving the above problem is shown in FIGS. 1 and 2.

As shown in FIG. 1, the invention according to claim 1 reads the recorded information at a predetermined reproduction speed from a recording medium in which a plurality of pieces of recorded information are recorded with appropriate spacing times, and reproduces and outputs the recorded information. The information reproducing device includes a memory capable of storing recorded information read from the recording medium, and the recording medium at a higher speed than the predetermined reproduction speed based on the required reproduction time of the recorded information currently being reproduced and the space time. and a second means for reading stored information from the memory at the predetermined playback speed.

In addition, as shown in FIG. 2, the invention as claimed in claim 2 is such that, as shown in FIG.
The information reproducing device reads and reproduces the recorded information at a predetermined reproduction speed, and includes a memory capable of storing the recorded information read from the recording medium, a required reproduction time of the recorded information currently being reproduced, and the space time. a first means for reading from the recording medium at a faster speed than the predetermined playback speed based on the exchange time and writing the read recorded information to the memory; and storing from the memory at the predetermined playback speed. and second means for reading information.

[Effect]

In the case of the invention of claim 1, as shown in FIG. The data is read out at a higher speed than the reproduction speed of , and stored in the memory 3 at a higher speed. The information stored in the memory 3 is read out at a constant speed by the second means and output as reproduced data.

In the case of the invention of claim 2, as shown in FIG. 2, the first means 2 calculates the necessary reproduction time of the recorded information to be reproduced, the space time, and the exchange from one recording medium selected by the autochanger. The data is read out faster than the predetermined playback speed based on time and stored in the memory 3 at a faster speed. The information stored in the memory 3 is read out at a constant speed by the second means and output as reproduced data.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

First Embodiment This embodiment corresponds to claim 1, and is a first embodiment in which a plurality of songs are recorded.
This is a case in which the inter-song time (blank time between songs) between the next song to be played and the next song to be played after that on a CD is apparently eliminated.

FIG. 3 shows a block diagram of the information reproducing apparatus P1 of the first embodiment, and FIG. 4 shows a block diagram of its main parts.

As shown in FIG. 3, the CD11 is connected to the spindle motor 12.
Rotationally driven by. The musical piece recorded in bit format on the recording surface of the CD 11 is read by a pickup 13 using a laser beam and converted into an electrical signal. The electrical signal output from the pickup 13 is separated into an RF flaw signal error generation signal in the preamplifier 14. The error generation signal is sent to a speed controller 15 that controls the rotational speed of the spindle motor 12. The output signal of the speed controller 15 is sent to a servo unit 16 that generates control signals for tracking servo, focusing servo, and the like. The signal is sent to a decoder 17 which has functions such as RF flaw signal, audio data decoding, and spindle servo error signal generation. RAM1 connected to decoder 17
8 temporarily stores the decoded data. The audio data output from the decoder 17 is transmitted to the data control section 20.
sent to. The data control unit 20 has an interface 21
and RAM controller 22 and RAM for temporarily recording data.
M23 and interface 24 and digital/analog (D
/A) It is composed of a converter 25 and the like, and its detailed configuration is shown in FIG. That is, the inverter INV and the NAND circuit 21.21Ll that constitute the interface 21
1, the stereo signal is separated into R and L signals, and each signal is sent to a serial/parallel (S/P) converter 2121.
It is converted into a parallel signal by R2;'L2. The output of the S/P converter 21 21L2 is R2
The data is input to the RAM controller 22, and is temporarily stored in the RAM 23 through processing by the RAM controller 22. This RAM 23 is, for example, a multi-port memory that can be written using a high-speed clock and read at a constant speed (normal speed).
It is RAM. The output of the RAM controller 22 is converted into an audio signal via a parallel/serial conversion interface 24.24L and a differential/analog converter 25.25L. Unnecessary components of this audio signal are removed by a low-pass filter 26.26L, and the output terminal 0UTR is output.

Output from 0UTL. Control data output from decoder 17 is sent to system controller 30. The system controller 30 is connected to an operation section 31 that performs various data operations.

The system controller 30 is configured using a CPU or the like, and centrally executes control necessary for the reproduction operation of the information reproduction apparatus P1. Controls necessary for playback operations include, for example, normal play and program play. In addition to these controls, the system controller 30 according to this embodiment
are a first speed read signal control section 30, a first speed write signal control section 30, and a second speed read signal control section 30.
etc. have b c.

The first speed read signal control unit 30 is designed to prevent blank time from occurring during the inter-song time from the end of the previous recorded information until the next recorded information (recorded information scheduled to be played next) starts playing. generates a high read speed (first speed);
Speed read signal R.

It is sent to the speed controller 5 as A rotation control signal corresponding to the first speed is sent from the speed controller 5 to the spindle motor 2.

The first speed write signal control unit 30 generates a first speed write signal Wl for writing the recorded information read out at the first speed into the RAM 23 at the first speed, and sends it to the RAM controller 22.

Second speed read signal control section 30. The recorded information written in the RAM 23 is transferred to the second speed (normal playback speed, i.e.,
A second speed read signal R2 for reading at a constant speed) is generated and sent to the RAM controller 22.

A spindle servo error generation signal generated from the decoder 17 is sent to the speed controller 5. In the speed controller 5, the following servo control signal is determined based on the error generation signal, the spindle servo error generation signal, and the first speed readout signal R1, and the servo control signal is determined as follows.
Sent to 6.

From the servo section 16, a spindle servo signal is sent to the spindle motor 2, and a tracking servo signal is sent to the pickup 13.

Next, the operation will be explained.

First, the operating principle of the first embodiment will be explained based on the diagram shown in FIG.

As shown in FIG.
Let t be the inter-song time from the end of D to the start of reproduction of the next recorded information (performance song) ND.

All of the previously recorded information FD is read out at high speed in a time width t2. Here, ti = t2 + ts. A high speed that satisfies this relationship (first speed, t of normal playback)
/ t (twice the speed) and stores the recorded information in the memory (
Data is written to the RAM 23) at a speed corresponding to the first speed, and at the same time, reading is performed at the normal speed.

Then, at time T1 when all the previous recorded information has been stored in the RAM 23, the pickup searches for the starting position of the next recorded information and waits at that position. Next, if reproduction is started from the start position of the next recorded information at the end timing of the previous recorded information read from the memory at the normal speed, the apparent blank time can be eliminated.

In the above relationship, as shown at the bottom of FIG. 5, all of the previously recorded information read out at the first speed up to timing T is stored in the RAM 23.

During this storage operation, data continues to be read from the RAM 23 at the normal speed and reproduced and output. During this reproduction output, a drive mechanism or the like (not shown) may be controlled to search for the start position of the next recording information.

The above control operations are executed by the control program set in the system controller 30, so below, the sixth
The above operation will be explained in detail with reference to the flowchart shown in the figure.

In FIG. 6, first, the inter-song time tS is read from a memory in which inter-song time data is prepared in advance (step 52).
1). Note that if the inter-song time is not prepared in advance, the inter-song time tS may be detected by, for example, performing high-speed reading of the CD in advance. Next, if the playback mode is program playback (step S22; Yes), the time data of the previous song n in the program memory is read, and the time data of the previous song n and the next song N stored in the program memory in advance are read. Load (step S23.524).

Also, if it is not program playback (step S22; N
o) Load the time data of the previous song n and the time data of the next song N (step S25°826). Next, the playback time t of the previous song n, which is known in advance, and the inter-song time t
, and performs calculation 11/(t − t, )=S (steps S27, 528). Next, step S36 described below
Check whether there is a pause state to be set in step 529.
), if so, release the pause state (step 530)
, if not (step S29; No), step S31
Proceed to. In step S31, eight times the normal playback speed (first
The previous song n is read out at the speed), and the read song n is read out at the first speed until the reading of the first speed is completed (step S32; No).
Write to memory (RAM23) at the speed (step 533
).

The previous song n written in the memory is read out at the normal playback speed (second speed) (step 534), and this reading is continued until the memory becomes empty (step 535). During the readout at the second speed, playback data (playback performance music) is output from the output terminal OUT. Furthermore, if the reading is completed (step 832; Yes), the recording head of the next song N is searched and a pause is taken at the beginning of the song (step 8
36), then "0" is written in the memory to clearly mark one section of the performance song (step 537).

Then, if the memory is empty (step 35; Ye
s), the reproduction of the previous song n ends. Next, if the next song N is the final song (step 38; YO2), there is no next song, so there is no need to control the high IIi readout and normal speed playback described above, and simply play the next song N. Normal playback is sufficient (step 539). If it is not the last song (step 338; No), there is another song, so control returns to step S21 again. Note that in step 338; No, the count of timer To may be set to intentionally provide a certain amount of blank time (step S40.341). In this way, by providing a blank time of several seconds between the previous recorded information and the next recorded information, the interval between each song can be made constant.

In this embodiment, the case where the inter-song time t is r is described, but in order to apparently eliminate the soundless time in the search time J that is required when searching for the next song during program playback, etc. For example, when jumping from song number 1 to song number 5, the search time is as follows after playback of song number l ends.
When the pickup moves to the recording head of track number 5, track number 2
~Total “time skipping” from song number 4. Therefore, if you know how many times the search speed is set to the normal speed, you can change the search time to move (search) from song number 1 to song number 5. It can be calculated using the following formula.

Normal playback speed The total time of the song number 2.3.4 can be calculated by calculating the sum of the performance times of the perfume oils read from the TOC information, and the search speed is a value specific to the device, so it is set in advance.

Second Embodiment This embodiment corresponds to claim 2 and is a case where an autochanger is used.

FIG. 7 shows an information reproducing apparatus P2 of a second embodiment.

In FIG. 7, parts that are the same as those in FIG. 3 are given the same reference numerals, and detailed description thereof will be referred to.

In Fig. 7, the difference from Fig. 3 is that an autochanger AC is added, and the system controller 3 is added accordingly.
The point is that an autochanger control section 30d is added to 0A.

Next, the operation will be explained.

First, the operating principle of the second embodiment will be explained based on the diagram shown in FIG.

As shown in Fig. 8, the playback time at the normal speed of the last playback recording information (last song) of the previous recording medium (CD) FM is defined as t5, and the time required to change to the next recording medium (CD) NM is defined as t5. Let it be tC. Here, the exchange time tC is the previous CD
This is the time from when the playback of a CD is stopped and the CD is stored in the magazine, the next CD is selected and loaded to the playback position, and the playback starts. The last reproduced recorded information of the previous recording medium FM is read out at high speed within the time width t6. Here, t
s = t6 + tc. Reading is performed at a high speed (first speed, that is, t5/16 times the normal speed) that satisfies this relationship, and data is written to the memory at the first speed. Then, if the exchange of the next recording medium NM is started at a timing T2 that takes the exchange time tC into account, the first reproduction recorded information of the next recording medium NM is reproduced by a normal means at a timing T2.
and the destination recording medium F read out from the memory at normal speed.
The end timing T2 of the last reproduced recording information of M coincides, and blank time due to exchange time can be eliminated even if continuous reproduction is performed from an apparently optical recording medium to the next recording medium.

The above control operations are executed by a control program set in the system controller 30A, so the above operations will be described in detail below with reference to the flowchart shown in FIG. 9.

In FIG. 9, first, the exchange time t is read from data previously stored in the memory (step 551), and then it is determined whether the playback mode is program playback (step 552). If program playback (step S5
2; Yes), the time data of the previous song n stored in the program memory in advance is loaded (step 553
).

Next, it is determined whether or not the previous song n is the last program setting song on the previous CD (the CD currently being played), and if negative (step 354; No), the previous song n is program-played. (Step 555). Also, if it is not program playback (step 852; No), the previous song n
is loaded (step 856) and the next song n is on that CD.
It is determined whether or not this is the last recorded song (step 557).

If it is not the last time, normal playback is performed (step S57; No
, step 558), and if it is the last (step S
57; Yes), it is determined whether or not to continue playing the next CD continuously (Step 559). If it is continuous (Step S59; Yes), the playing time t5 of the previous song n and the exchange time [C From t5 / (t,
-tc)=s (step S60.561), and the previous song n is read out at 81 times the normal playback speed (first speed) (step 562). Until reading at the first speed is completed (step 563), the previously read song n is written into the memory at the first speed (step 564). The previous song n written in the memory is read out at the normal playback speed (second speed) (step 565), and this reading is continued until the memory becomes empty (step 566). During the readout at the second speed, the reproduced data (the previously reproduced song n) is output from the output terminal OUT. If the reading is completed (step S63; Yes), "0" is written in the memory to clearly mark one section of the performance song (step 567). After that, a command to perform a disc change is issued (step 56).
8). Then, if the memory becomes empty (step S6
6; Yes), the reproduction of the previous song n ends. Next, if the next song is the final song (step 369; Yes)
, since the CD is not replaced, it is sufficient to simply perform normal playback (step 570). Also, if it is not the final song (
Step S69: No), return to step S51 again,
Control is performed in consideration of the following recording media.

In this embodiment, as shown in FIG. 8, the next recording medium NM was reproduced following the previous recording medium FM, but between the reproduction of the previous recording medium and the next recording medium, the first embodiment As in the example, a blank time of several seconds may be provided by entering a pause state for a predetermined period of time.

Third Embodiment This embodiment also uses an autochanger, but the difference from the second embodiment is that the CD is forcibly replaced during playback of a song.

FIG. 10 shows an information reproducing apparatus P according to a third embodiment. In FIG. 10, the same parts as in FIG. 7 are given the same reference numerals, and the detailed description thereof will be referred to.

10 differs from FIG. 7 in that the system controller 40 includes a first speed read signal control section 40, a first speed write signal control section 40. The difference is in the program content. First speed continuous signal control unit 40. A high speed read signal R8 is sent from the first speed write signal control section 40. A high-speed write signal W3 is sent from.

Next, the operation will be explained.

First, the operating principle of the third embodiment will be explained based on the diagram shown in FIG. 11.

FIG. 11(A) shows the case of the second embodiment. In this case, reading and writing of recorded information on the previous recording medium FM is completed at timing T2, and from timing T to T3, the second speed is set. is read and played. After timing T3, the next recording medium NM is normally played back, so
No apparent blank time (sound breakage) occurs. However, the first
As shown in Figure 1 (B), at timing T4, CD
Assume that they are exchanged. Then, since the amount of data stored in the memory is half (1/2F), if playback is performed at normal speed, the stored data will become empty at timing T5. Therefore, of the exchange time t until the autochanger starts playing the next recording medium NM, there is a blank time (no sound interruption, time width 1.).

Therefore, as shown in FIGS. 11(C) and (D), reading is initially performed at a high speed 82 times the normal speed, and when the memory approaches full F (timing T6), the speed is gradually reduced until the memory becomes full F ( At timing T7), the data is read out at normal speed. If reading from the memory is read and reproduced at the normal second speed, and the next recording medium NM is normally reproduced at timing T8, it is possible to apparently eliminate blank time.

The above control operations are executed by the control program set in the system controller 40, so below, the first
The above operation will be explained in detail with reference to the flowchart in FIG.

In FIG. 12, first, the start-up time τ and the exchange time tC are read from data stored in the memory in advance (
Step 581), then it is determined whether the set playback mode is program playback (step 582)
. If it is program playback (step 882; Yes)
, the time data of the previous song n and the next song N, which are stored in the program memory in advance, are loaded (steps 383 and 584). Furthermore, if it is not program playback (step S82; No), the previous song n and the next song N are loaded (step S85.586). Next, the startup time τ
A speed multiplier that can store the recorded information required for the exchange time tC in the memory is determined (step 587). For example, as shown in FIGS. 11(C) and (D), this magnification is 82 times the normal speed for rapid reading until the memory is close to full F, and when the memory is close to full F, the speed is slowed down and the memory is full. If it does, just set it to normal speed. Next, the presence or absence of a pause time is checked, and if a pause time is set (step 888; Yes), the pause time is canceled (step 589). The song is read out at 82 times the normal speed (step 59o), and the read data is written into the memory at 32 times the normal speed (step 591). The contents are read from memory at normal playback speed (step 592). The above state is continued until the data corresponding to the exchange time tC is accumulated in the memory (step 593), and when a predetermined amount of data is accumulated, the normal reading speed is restored (step 594).

If the reading is not completed (step S95; No), the CD is not replaced (step 896; No), and the memory is not empty, the operations from step S92 onward are repeated (step 897; No). If the memory is empty (step S97; Yes), a timer TO for setting blank time is set (step 598), and if the set time has come (step s99; Yes), the process returns to step S81. In step S95, if reading is completed (step S95)
95; Yes), it is determined whether or not there is a next song to be played, and if there is a song to be played (step 5100; Yes), the next song is searched and a standby state is entered (step 5IOI). Also, in step 896, if the CD is replaced (step 3
96; Yes), the system enters a standby state at the beginning of the next CD song (step 5102). Next, 0'' is written to the memory (step 5103), and the memory is read at normal speed (step S104). In step 8100, if there is no next song (step 8100).

No) The above control is unnecessary, so the control ends.

In the above embodiment, a CD is used as the recording medium, but CD-ROM, DAT (digital audio tape), LVD (laser vision disc) may also be used.
Of course, the present invention can be applied to any recording medium that can be randomly accessed.

〔Effect of the invention〕

As explained above, according to the present invention, recorded information read at high speed is temporarily stored in memory at high speed, and during blank time such as search time, it is read from the memory and reproduced at normal speed. Compared to the case where two conventional playback mechanisms are used, the apparatus can be made smaller, and blank time can be eliminated using inexpensive means.

[Brief explanation of drawings]

Fig. 1 is a principle block diagram of claim 1, Fig. 2 is a principle block diagram of claim 2, Figs. 3 and 4 are block diagrams of the first embodiment, and Fig. 5 is a principle block diagram of the first embodiment. 6 is a flowchart of the first embodiment, FIG. 7 is a block diagram of the second embodiment, FIG. 8 is a diagram explaining the principle of the second embodiment, FIG. 9 is a flowchart of the second embodiment, Figure 10 is the third
A block diagram of the embodiment, Fig. 11 is a diagram explaining the principle of the third embodiment, Fig. 12 is a flowchart of the third embodiment, and Fig. 13 is a C
FIG. 14 is a conceptual diagram of the exchange time and search time of D. FIG. 14 is a conceptual diagram of the conventional blank time removal means. 1...Single recording medium 2...First means 3...Memory 4...Second means AC...Autochanger

Claims (1)

[Scope of Claims] 1. In an information reproducing apparatus that reads and reproduces and outputs recorded information at a predetermined reproduction speed from a recording medium in which a plurality of pieces of recorded information are recorded with appropriate space times from each other, the recording medium comprises: a memory capable of storing recorded information read from the recording medium; and a memory capable of storing recorded information read from the recording medium at a speed higher than the predetermined reproduction speed based on the required reproduction time of the recorded information currently being reproduced and the space time; An information reproducing apparatus comprising: first means for writing recorded information into the memory; and second means for reading stored information from the memory at the predetermined reproduction speed. 2. The information reproducing apparatus according to claim 1, further comprising a reproducing program means capable of arbitrarily setting recorded information to be reproduced from among the plurality of recorded information. 3. An information reproducing device that appropriately exchanges a plurality of recording media on which a plurality of pieces of recorded information are recorded with appropriate space times from each other at a predetermined exchange time, and reads and reproduces and outputs the recorded information at a predetermined reproduction speed. A memory capable of storing the recorded information read from the recording medium, and the recording at a higher speed than the predetermined reproduction speed based on the required reproduction time of the recorded information currently being reproduced, the space time, and the exchange time. A first means for reading recorded information from a medium and writing the read recorded information into the memory, and a second means for reading stored information from the memory at the predetermined playback speed. Information reproducing device. 4. The information reproducing apparatus according to claim 3, further comprising a reproducing program means capable of arbitrarily setting recorded information to be reproduced from among the plurality of recorded information recorded on the plurality of recording media.