JPH03237672A - Music reproduction device - Google Patents

Abstract

PURPOSE:To eliminate the waiting time of music by switching data from a first memory means storing data for prescribed time from the head of music data and data from a second memory means storing subsequent data after prescribed time from the head of designated music. CONSTITUTION:Data for t-hours from the head of music data on respective pieces of music are previously loaded on the first memory 6 and music data of designated music in the first memory 6 is reproduced at the same time as music selection for reproduction. A signal read part executes a seeking operation in a place after t-hours from the head of designated music for reproduction from a medium 3 and music data are sequentially stored in the second memory 7. Then, data are sequentially reproduced from the second memory 7 after reproduction for t-hours from the first memory 6. Thus, reproduction is attained without waiting time by access time at the same time as music selection.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a music reproducing apparatus for reproducing a medium on which music data and the like are recorded as digital signals.

Conventional technology In recent years, compact discs (compact discs) using optical discs (
(CD) or laser disc (LD) players are becoming popular. Those disks have
There is a table of contents (TOC) area in which information such as the starting point of a song is recorded, and the player accesses it based on this information. Table 1 shows an example of the contents of the TOC.

In the first table TOC, the track number representing the song number and the absolute start time of each round are written in minutes and 9 seconds and frames. A normal player reads this TOC in advance and starts accessing it. In the example in Table 1, the values 01 to 04 are written in the track number field, representing the first to fourth songs, respectively, and the values written next are:
It means the minutes and 9 seconds of the start time of each episode, and the frame. AO in the track number section means the start of the recorded data area, A1 means the end of the recorded data area, and A
2 means the end of the logical records recorded, followed by their corresponding absolute times. Therefore, when the playback device is specified to play the fourth track, it searches for the item with track number 4, reads its absolute start time, and
Access that point and perform the action to start playback.

FIG. 4(a) schematically shows the TOC and information recorded on the disc when m songs (m is an integer) are included. T is the starting point of TOC, S is the starting point of the song, (1) is the starting point of the first song, (2) is 2
The starting point of the song, (m) is the starting point of the m-th song,
K represents the song end point, and E represents the logical end point. When the playback device is specified to play the second track, it first accesses the T point, reads the TOC content, and determines the absolute start time point (of the second track following track number 2).
2) is read, point (2) in FIG. 4(a) is accessed, and playback is started.

Therefore, the above-described process is always performed during playback by the music playback device configured as described above.

Problems to be Solved by the Invention However, the above configuration has a problem in that the above process requires access time before music is played back.

In view of this, the present invention loads the vicinity of the beginning of the music data into the first memory in advance, and when the signal reading section of the playback device reaches the specified song point, the data is sequentially stored in the second memory. However, it is an object of the present invention to provide a reproduction device that reproduces data from a second memory after reproduction from the first memory, thereby eliminating substantial access time.

Means for Solving the Problems In order to achieve this object, the present invention provides a music playback device that plays back a medium in which music data is managed and recorded, and which plays back a period of time t from the beginning of each music data. 1st to store
music having a memory means, a second memory means for storing subsequent data four hours after the beginning of a specified song, and a switching means for switching data from the first memory means and the second memory means. It is a playback device.

Effect of the Invention With the above-described configuration, the present invention can start playing music as soon as an arbitrary song is specified, eliminating the need for waiting time for a song.

Embodiment FIG. 1 shows a flowchart of a music reproducing apparatus according to an embodiment of the present invention.

FIG. 3 is a block diagram showing the configuration of the music playback device, in which 10 is a medium on which music data is recorded, 11 is a signal reading unit that reads music data from the medium 10, and 12 is a data signal demodulation circuit that demodulates the data signal. , 13 is an access control circuit, 14 is a drive circuit, 15 is a drive motor, 16 is a T
This is an OC information storage section.

FIG. 2 is a block diagram showing the configuration of a data signal demodulation circuit, in which 1 is a central processing unit (referred to as CPU);
2 is a read-only memo IJ containing the program code (
(referred to as ROM), 3 is a medium on which music data is recorded, 4 is a data reading unit that reads data from the medium 3, 5
numeral 6 is a music data reproducing section for reproducing music data; numeral 6 is a first memory for loading music data; and numeral 7 is a second memory for storing music data. In FIG. 4(b), data X for time t from the beginning of each round and data Y thereafter are divided, and the data X is loaded into the first memory 6 in FIG. 2, and the data Y are sequentially stored in the second memory 7 in FIG. FIG. 5 shows the configuration of the first memory 6 of FIG. 2, in which the data in the X portion of FIG. 4(b) each time is managed and loaded.

The operation of the music playback device of this embodiment configured as described above will be described below.

In FIG. 1, when the playback device starts up, step 21
The TOC of the medium 10 shown in FIG.
The information is stored in the OC information storage section 16. Next, in step 22, an access command is issued to read data X for time t in FIG. 4(b) each time. Here, the TOC in Figure 3
According to the contents of the information storage section 16, the access control circuit 13
controls the drive circuit 14 and drive motor 15 to perform a seek operation to the data position. The X data read through the signal reading section 11 and the data signal demodulation circuit 12 is managed as shown in FIG.
Herod.

At step 23, an arbitrary song is selected.

When a song is selected, two actions are performed simultaneously.

One is step 24 and the other is step 25
It is. In step 24, data for time t is retrieved from the first memory 6 of FIG. 2 having the configuration shown in FIG. At step 28, the data from the first memory 6 is output to step 29. In step 29, the music data is played back. On the other hand, in step 25, the signal reading unit 11 seeks to the position of the song specified in step 23 plus the time t. If the designated song is the first song, this position is (1)-Y in FIG. 4(b). In step 26, the data of Y is sequentially managed and stored in the second memory 7 of FIG. 2 from this position. During these operations, data for a time period t is read out from the first memory 6, and when it is completely reproduced, in step 28, the data is switched to the data from the second memory 7 and outputted to step 29. Music is played. Step 27
The operation of step 26 is repeated until the data of Y has been read, and when it is finished, the process moves to step 23, where the next song is specified.

As described above, according to this embodiment, when playing back from a medium in which music data is managed and recorded, the time t from the beginning of each music data is loaded in advance into the first memory, and the music data to be played is selected. At the same time, the music data of the specified song in the first memory is played back, and at the same time, the signal reading section performs a seek operation to a location t hours after the beginning of the specified song to play back the music data from the medium. The data is sequentially stored in the second memory, and after playback for time t from the first memory, the data is stored in the second memory.
By sequentially playing back music from the memory, music can be played simultaneously with selection without waiting time due to access time.

As described in detail, according to the present invention, music can be played at the same time as song selection even in a drive device with slow access, and its practical effects are great.

[Brief explanation of drawings]

FIG. 1 is a flowchart of a music playback device in an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a data signal demodulation circuit in the same embodiment, and FIG. 3 is a block diagram showing the configuration of a music playback device in the same embodiment. A block diagram, FIG. 4 is a diagram schematically representing the TOC and information recorded on the disc when m songs are included, and FIG. 5 is a diagram showing the configuration of the first memory 6 in FIG. 2. be. l... Central processing unit, 2... Read-only memory, 3... Medium, 4... Data reading section, 5... Audio data reproducing section, 6... First memory, 7 ...Second memo 1 liter

Claims (1)

[Scope of Claims] A music playback device for playing back a medium in which music data is managed and recorded, comprising: a first music playback device that stores music data for each song for a period of time t from the beginning;
a second memory means for storing subsequent data after t hours from the beginning of the specified song; and a switching means for switching data from the first memory means and the second memory means. A music playback device comprising: