JP2004127465A - Compressed audio data reproducing apparatus and music transition control method of compressed audio data reproducing apparatus - Google Patents

Abstract

Provided is a compressed audio data reproducing apparatus capable of performing smooth reproduction with no waiting time at the time of transition from a music being reproduced to a music to be reproduced next.
A compressed audio data reproducing apparatus divides a memory area of a semiconductor memory (14) for a music being reproduced and for a music to be reproduced next, and stores compressed audio data of the music being reproduced in divided memory areas. A writing control unit 11 for writing compressed audio data of a song to be reproduced next, and a memory area for a song to be reproduced next when a reproduction request for the next song is issued. Read control means 11 for immediately reading out the compressed audio data of the music to be reproduced.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a compressed audio data reproducing apparatus and a music transition control method of the compressed audio data reproducing apparatus.
[0002]
[Prior art]
CD-ROMs and compact discs are widely used as recording media for music reproduction. Digital audio data is compressed and recorded on these recording media, and is reproduced by a compressed audio data reproducing device such as a CD player or a compact disk player.
[0003]
By the way, in the above-described compressed audio data reproducing apparatus, when the music being reproduced is stopped and the reproduction of the next music is started (hereinafter referred to as “skip”), the music registered by the operator in advance is automatically recorded. In the program playback mode for playback, when the playback of the previous song ends and the playback of the next song is started, and in the intro playback mode where playback is repeated only for a certain period of time from the beginning of the song, the intro playback of the previous song starts. There is a problem that it takes time until the next song is reproduced, for example, when the reproduction is completed and the process shifts to the intro reproduction of the next song. The reason will be described with reference to the flowchart of FIG. FIG. 9 is a flowchart showing the flow of a music transition control method in a conventional compressed audio data reproducing apparatus, which is performed after a TOC (Table Of Contents) read is completed or when reproduction is started by an operator's operation from a reproduction stopped state. 3 shows a processing flow.
[0004]
First, when a key input is detected, the address of the song to be reproduced on the disc is obtained from the TOC, and the pickup is moved to the target address (step S201). The music to be reproduced indicates the first music described in the TOC in the case of the normal reproduction mode, and the first music in a preset music order in the case of the program reproduction mode or the intro reproduction mode. After moving the pickup to the target address, the compressed audio data recorded on the disk is read, and writing to the semiconductor memory is started (step S202). At the same time, the compressed audio data is read from the semiconductor memory, and the audio is output while expanding (step S203). In step S204, the reading of the compressed audio data, the writing to the semiconductor memory, the reading of the data from the semiconductor memory, the decompression of the data, and the audio output are repeated until a request for reproducing the next music piece occurs.
[0005]
In step S204, when a request to reproduce the next song is issued, the data in the semiconductor memory is cleared and the audio output is stopped (step S205), and the address of the next song to be reproduced on the disc is obtained from the TOC. Then, the pickup is moved to the target address (step S206). After moving the pickup to the target address, the compressed audio data recorded on the disk is read, and writing to the semiconductor memory is started (step S207). At the same time, compressed audio data is read from the semiconductor memory, and audio output is started while decompressing (step S208).
[0006]
As described above, in the conventional music transition control method, when a reproduction request for the next music is generated, the data stored in the semiconductor memory is cleared once, and then the address of the next music is searched. It took a long time before the next song was played because compressed audio data was read.
[0007]
Japanese Patent Application Laid-Open No. H11-163,086 discloses that when a desired song is selected, when the desired song is selected, the position information of the desired song is read from the TOC area of the disc or the work memory, and the desired song on the disc is read. There is disclosed a disk playing method in which a performance is started after searching for a position to be played.
[0008]
[Patent Document 1]
Japanese Patent No. 2902240
[Problems to be solved by the invention]
Therefore, the present invention has been made in view of such circumstances, and a compressed audio data reproducing apparatus and a music transition control method of the compressed audio data reproducing apparatus capable of smoothly reproducing music without waiting time between music. The purpose is to provide.
[0010]
[Means for Solving the Problems]
2. The compressed audio data reproducing apparatus according to claim 1, further comprising a semiconductor memory for storing the compressed audio data read from a disk on which a plurality of compressed audio data are recorded, and reading the compressed audio data from the semiconductor memory. In a compressed audio data reproducing apparatus for reproducing audio, a memory area of the semiconductor memory is divided for a music being reproduced and for a music to be reproduced next, and the divided memory area is used to compress the music being reproduced. Writing control means for writing audio data and compressed audio data of a song to be reproduced next, and a memory area for a song to be reproduced next when a request to reproduce the next song is issued. Read-out control means for immediately reading out the compressed audio data of the music to be reproduced It is characterized in.
[0011]
According to the above configuration, at first, it is not necessary to move the pickup for reading the compressed audio data of the next song or to perform the writing process to the semiconductor memory. There is no waiting time until the song is played, and the song can be played smoothly.
[0012]
The compressed audio data reproducing apparatus according to claim 2, wherein the writing of the compressed audio data to the divided memory area is performed by first writing the compressed audio data of the music being reproduced. Data is written in a fixed amount, and thereafter, a predetermined amount of compressed audio data of the music to be reproduced next is written from the beginning of the music.
[0013]
According to the above configuration, the compressed audio data of the music currently being reproduced is written in the memory area, and thereafter, the compressed audio data of the music to be reproduced next can be stored.
[0014]
According to a third aspect of the present invention, there is provided the compressed audio data reproducing apparatus according to the first or second aspect, wherein the reproduction request of the next music piece is issued by the operator while reproducing the next music piece. To perform the next tune in the program playback mode in which the operator automatically plays the tune registered in advance, or in the intro playback mode in which the playback is repeated only for a certain period of time from the beginning of the tune. It is characterized in that it is executed when and when the reproduction is started.
[0015]
According to the above configuration, the waiting time between music pieces can be reduced and smooth music piece reproduction can be performed in any music transition operation of the compressed audio data reproduction device.
[0016]
5. The music transition control method for a compressed audio data reproducing apparatus according to claim 4, further comprising: a semiconductor memory for storing the compressed audio data read from a disk on which a plurality of compressed audio data are recorded; A music transition control method for a compressed audio data reproducing apparatus that reads out compressed audio data and reproduces audio, wherein the memory area of the semiconductor memory is divided into a music area being reproduced and a music area to be reproduced next, Writing the compressed audio data of the music being reproduced and the compressed audio data of the music to be reproduced next to the divided memory area; and, when a reproduction request for the next music is issued, the music to be reproduced next. Immediately reading out the compressed audio data of the song to be reproduced next from the memory area for And wherein the Mukoto.
[0017]
According to the above method, at first, it is not necessary to move the pickup for reading the compressed audio data of the next song or to perform the writing process to the semiconductor memory. There is no waiting time until the song is played, and the song can be played smoothly.
[0018]
A music transition control method for a compressed audio data reproduction device according to a fifth aspect is the music transition control method for a compressed audio data reproduction device according to the fourth aspect, wherein the writing of the compressed audio data to the divided memory area includes First, a predetermined amount of compressed audio data of the music being reproduced is written, and then a predetermined amount of compressed audio data of the music to be reproduced next is written from the beginning of the music.
[0019]
According to the above method, the compressed audio data of the music currently being reproduced is written to the memory area, and thereafter, the compressed audio data of the music to be reproduced next can be stored.
[0020]
A music transition control method for a compressed audio data reproduction device according to claim 6 is the music transition control method for a compressed audio data reproduction device according to claim 4, wherein the reproduction request for the next music is performed during reproduction. When the operator issues a playback instruction for the next song, when the operator shifts to the next song in the program playback mode in which the song registered in advance is automatically played, and when only a certain time from the beginning of the song is played. In the repetitive intro reproduction mode, the process is executed when the process shifts to the intro reproduction of the next music.
[0021]
According to the above method, the waiting time between music pieces can be reduced and smooth music piece reproduction can be performed in any music transition operation of the compressed audio data reproducing apparatus.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a compressed audio data reproducing apparatus according to an embodiment of the present invention will be specifically described with reference to the drawings.
[0023]
FIG. 1 is a block diagram showing a schematic configuration of a compressed audio data reproducing device according to an embodiment of the present invention. The compressed audio data reproducing apparatus according to the embodiment of the present invention includes a key input unit 10, a microcomputer 11, a nonvolatile semiconductor memory (EEPROM) 12, a system controller 13, a semiconductor memory 14, a spindle motor 15, a pickup 16, and a traverse motor 17. , An RF (high frequency) amplifier 18, a D / A (digital / analog) converter 19, an amplifier 20, and a speaker 21.
[0024]
The key input unit 10 is an input unit for the operator to perform various operations on the compressed audio data reproducing device. The microcomputer 11 is a control unit that controls the entire compressed audio data reproducing apparatus. The control procedure is stored in the nonvolatile semiconductor memory 12 in the form of a program, and the stored contents are retained even when the power is turned off. Is done. The system controller 13 controls expansion of the compressed audio data and control for causing the pickup 16 to follow the optical disk 22. The semiconductor memory 14 is a memory for storing compressed audio data read from the optical disc 22. The spindle motor 15 controls the rotation of the optical disc 22, and the pickup 16 reads the compressed audio data recorded on the optical disc 22. The traverse motor 17 moves the base of the pickup 16 in the radial direction of the optical disk 22 in synchronization with the reading operation. The RF amplifier 18 amplifies the data signal read by the pickup 16. The read compressed audio data is temporarily stored in the aforementioned semiconductor memory 14 and then expanded by the system controller 13. The expanded audio data is converted into an analog signal by the D / A converter 19. The analog signal is amplified by the amplifier 20 and output from the speaker 21 as sound.
[0025]
FIG. 2 is a flowchart showing a flow of a music transition control method of the compressed audio data reproducing device according to the embodiment of the present invention.
[0026]
FIGS. 3 to 8 are conceptual diagrams showing a storage state of the compressed audio data in the semiconductor memory 14 of the compressed audio data reproducing device according to the embodiment of the present invention.
[0027]
First, the processing when the reproduction is started by the operation of the operator after the end of the TOC read or from the reproduction stopped state will be described with reference to FIG. First, when a key input is detected, the address of the music to be reproduced on the optical disk 22 is obtained from the TOC, and the pickup 16 is moved to a target address (step S101).
[0028]
After moving the pickup 16 to the target address, the compressed audio data recorded on the optical disk 22 is read, and the read compressed audio data is written into the semiconductor memory 14 (step S102). At the same time, the compressed audio data is read from the semiconductor memory 14 and is output as audio while expanding (step S103).
[0029]
Here, FIG. 3 is a diagram showing a storage state of the compressed audio data in the semiconductor memory 14 immediately after the start of the reproduction. The memory area of the semiconductor memory 14 is stored in a memory area for the music being reproduced so that compressed audio data of the music to be reproduced next is stored in advance and reproduction can be started immediately when a reproduction request for the next music is generated. It is divided into an area and a memory area for music to be reproduced next. R1 in FIG. 3 is a compressed audio data writing area for the music being reproduced, and R2 is a compressed audio data writing area for the music to be reproduced next.
[0030]
P1 in FIG. 3 is an address for sequentially writing the compressed audio data read from the optical disk 22 to the semiconductor memory 14. On the other hand, the compressed audio data written in the semiconductor memory 14 is sequentially decompressed and output as audio. P2 is an address for sequentially reading compressed audio data from the semiconductor memory 14 for decompression. A1 is the start address of the compressed audio data write area R1 for the song being reproduced, A2 is the last address of R1, A3 is the start address of the compressed audio data write area R2 for the song to be reproduced next, and A4 is R2. Is the last address.
[0031]
In step S102 of FIG. 2 described above, the compressed audio data of the music being reproduced is stored in the memory area R1 of the semiconductor memory 14. Similarly, in step S103, the compressed audio data already written in the semiconductor memory 14 is decompressed and the sound is output.
[0032]
Returning to the flowchart of FIG. 2, in step S104, the data storage state in the memory area R1 of the semiconductor memory 14 is determined. If the writable area remains, the process returns to step S103, and the data writing is repeated until the compressed audio data is written to the last address A2 of the memory area R1. Whether or not the compressed audio data has been written to the entire memory area R1 is determined by comparing the final address A2 of the memory area R1 with the address of the compressed audio data write pointer P1. It is determined that the data has been written to the area.
[0033]
Next, as shown in FIG. 4, when the compressed audio data of the music being reproduced is written up to the last address A2 of the memory area R1, it is determined in step S104 of FIG. Then, the address of the next song to be reproduced on the optical disk 22 is obtained from the TOC, and the pickup 16 is moved to the head address of the next song to be reproduced. Here, the music to be reproduced next indicates the next music described in the TOC in the normal reproduction mode, and the next music in a predetermined music order in the program reproduction mode or the intro reproduction mode. After moving the pickup 16 to the target address, the compressed audio data recorded on the optical disk 22 is read, and writing to the semiconductor memory 14 is started (step S106).
[0034]
Since the compressed audio data read in this step S106 is not the music currently being reproduced, as shown in FIG. 5, writing is performed from the start address A3 of the compressed audio data writing area R2 for the music to be reproduced next. .
[0035]
Next, in step S107, the data storage state in the memory area R2 of the semiconductor memory 14 is determined. If a writable area remains in the memory area R2, the process returns to step S106, and data writing is repeated until the compressed audio data is written to the last address A4 of the memory area R2. Whether or not the compressed audio data has been written to the entire area of the memory area R2 is determined by comparing the final address A4 of the memory area R2 with the address of the compressed audio data write pointer P1, and when P1 = A4, the entire address of the memory area R2 is determined. It is determined that the data has been written to the area.
[0036]
Here, as shown in FIG. 6, when the compressed audio data of the music to be reproduced next is written up to the last address A4 of the memory area R2, it is determined in step S107 of FIG. Proceeding to step S108, the continuation of the compressed audio data of the music being reproduced is written into the memory area R1 of the semiconductor memory 14 again.
[0037]
At this time, as shown in FIG. 7, in the compressed audio data writing area R1 for the music being reproduced, the subsequent compressed audio data is written to the area R3 for which audio output has already been completed.
[0038]
Returning to the flowchart of FIG. 2, when a reproduction request for the next music is generated during the reproduction of the music (step S109), as shown in FIG. 8, the decompression pointer P2 of the compressed audio data is set to the start address A3 of the memory area R2. It moves and starts decompression of the compressed audio data from the address, and outputs the sound of the next music (step S110).
[0039]
When the request for reproducing the next music piece is generated, the compressed audio data of the next music piece has already been written to the area R2 of the semiconductor memory 14. Therefore, the decompression pointer P2 is set to the data at the address, and decompression is started from that point. Then, the next tune can be reproduced immediately upon detection of the reproduction request.
[0040]
After that, the same steps as those after step S103 are repeated, and the subsequent part of the compressed audio data is written from the head address A1 of the memory area R1, which is the memory area for the music currently being reproduced, and further to the memory area R2. Will be stored.
[0041]
According to the above-described compressed audio data reproducing apparatus and the music transition control method of the compressed audio data reproducing apparatus, when the operator skips the music being reproduced, or when the operator transits to the next music in the program reproduction mode or the intro reproduction mode. In such a case, the next song can be reproduced instantaneously.
[0042]
【The invention's effect】
As described above, according to the present invention, when a reproduction request for the next music piece is generated, the compressed audio data of the music piece to be reproduced next is immediately read from the memory area for the music piece to be reproduced next. As a result, smooth playback of music without waiting time between songs becomes possible.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a schematic configuration of a compressed audio data reproducing device according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a flow of a music transition control method of the compressed audio data reproducing device according to the embodiment of the present invention.
FIG. 3 is a conceptual diagram showing a storage state of compressed audio data in a semiconductor memory of the compressed audio data reproducing device according to the embodiment of the present invention.
FIG. 4 is a conceptual diagram showing a storage state of compressed audio data in a semiconductor memory of the compressed audio data reproducing device according to the embodiment of the present invention.
FIG. 5 is a conceptual diagram showing a storage state of compressed audio data in a semiconductor memory of the compressed audio data reproducing device according to the embodiment of the present invention.
FIG. 6 is a conceptual diagram showing a storage state of compressed audio data in a semiconductor memory of the compressed audio data reproducing device according to the embodiment of the present invention.
FIG. 7 is a conceptual diagram showing a storage state of compressed audio data in a semiconductor memory of the compressed audio data reproducing device according to the embodiment of the present invention.
FIG. 8 is a conceptual diagram showing a storage state of compressed audio data in a semiconductor memory of the compressed audio data reproducing device according to the embodiment of the present invention.
FIG. 9 is a flowchart showing a flow of a music transition control method in a conventional compressed audio data reproducing device.
[Explanation of symbols]
Reference Signs List 10 Key input unit 11 Microcomputer 12 Nonvolatile semiconductor memory 13 System controller 14 Semiconductor memory 15 Spindle motor 16 Pickup 17 Traverse motor 18 RF amplifier 19 D / A converter 20 Amplifier 21 Speaker 22 Optical disk

Claims (6)

A compressed audio data reproducing device, comprising: a semiconductor memory for storing the compressed audio data read from a disk on which a plurality of compressed audio data are recorded, and reproducing the audio by reading the compressed audio data from the semiconductor memory;
The memory area of the semiconductor memory is divided into a music piece being reproduced and a music piece to be reproduced next, and compressed audio data of a music piece being reproduced and compressed audio data of a music piece to be reproduced next are divided into the divided memory areas. Write control means for writing
A read control unit for immediately reading compressed audio data of the song to be played next from the memory area for the song to be played next when a playback request for the next song is issued;
A compressed audio data reproducing apparatus comprising: Writing the compressed audio data to the divided memory area first writes a predetermined amount of the compressed audio data of the music being reproduced, and then writes the compressed audio data of the music to be reproduced next from the beginning of the music by a predetermined amount. 2. The compressed audio data reproducing apparatus according to claim 1, wherein the data is written by an amount. The reproduction request for the next song is performed when the operator issues a reproduction instruction for the next song during the reproduction, or when the operator shifts to the next song in the program reproduction mode in which the operator automatically reproduces a song registered in advance. 3. The compressed audio data reproduction according to claim 1 or 2, wherein the processing is executed in an intro reproduction mode in which reproduction is performed only for a predetermined time from the beginning of the music and a transition is made to intro reproduction of the next music. apparatus. A compressed audio data reproducing apparatus comprising a semiconductor memory for storing the compressed audio data read from a disk on which a plurality of compressed audio data are recorded, and reading the compressed audio data from the semiconductor memory and reproducing the audio; A transition control method,
The memory area of the semiconductor memory is divided into a music piece being reproduced and a music piece to be reproduced next, and compressed audio data of a music piece being reproduced and compressed audio data of a music piece to be reproduced next are divided into the divided memory areas. Writing each,
A step of immediately reading out compressed audio data of the next song to be played from the memory area for the next song to be played when a request to play the next song is issued;
A music transition control method for a compressed audio data reproducing apparatus, comprising: Writing the compressed audio data to the divided memory area first writes a predetermined amount of the compressed audio data of the music being reproduced, and then writes the compressed audio data of the music to be reproduced next from the beginning of the music by a predetermined amount. 5. The music transition control method for a compressed audio data reproducing apparatus according to claim 4, wherein the music data is written by an amount. The reproduction request for the next song is performed when the operator issues a reproduction instruction for the next song during the reproduction, or when the operator shifts to the next song in the program reproduction mode in which the operator automatically reproduces a song registered in advance. 6. The compressed audio data reproduction according to claim 4 or 5, wherein the processing is executed in the intro reproduction mode in which the reproduction is repeated only for a predetermined time from the beginning of the music, and when the processing shifts to the intro reproduction of the next music. Music transition control method for the device.

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