JPH0729355A - Minidisk player - Google Patents

Abstract

PURPOSE:To diminish the number of keys and hence to make the player compact by operating a fast forwarding and forward direction track number searching function and a fast running and backward direction track number searching function with a common key. CONSTITUTION:A sound is compressed and stored in a semiconductor memory 12 by a key block 14 having the fast forwarding and forward direction track number searching function and the fast running and backward direction track number searching function, and the fast forwading/fast running and the forward/ backward track number searching are discriminated by a time of pressing the key, and even in a period of discrimination, a sound output is obtained from the semiconductor memory 12 by program searching, and subsequently, a searching output is outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mini disc player.

[0002]

2. Description of the Related Art In a conventional car stereo or portable type CD player, in order to reduce the number of keys,
Use the fast-forward and forward direction track number search keys to distinguish between fast-forwarding and forward direction track number search depending on the time that the key is pressed, and use the fast-reverse or reverse direction track number search key. In many models, keys are made common by discriminating between fast reverse and backward track number search depending on the time the key is pressed.

When the determination result is a track number search in each direction, the voice is interrupted from that point to start the track number search, and when the search is completed, the voice of the track is output. If the determination result is fast-forward or fast-reverse, set the audio output level to several d.
Drop B, jump to the front or back of a few tracks and output the voice when the servo is stable, and play back for a certain time, then jump back or back to the front of a few tracks and output the voice when the servo is stable. Is repeated.

For the mini disk, a technique has been introduced in which a semiconductor memory is inserted as a data buffer between the EFM / ACIRC decoder and the audio compression decoder to improve the vibration resistance at the time of reproduction (for example, JAS Journal.
1, August 1991, pp. 37-42), models made up of such systems are the mainstream. However, when trying to provide the same function as the above CD player in such a system, the track position is different because the disk position where the currently output compressed data of audio is recorded is different from the disk position currently being traced. In the search, the sound is interrupted at the time when it is determined, so if the search target track is searched after that, the appearance of the CD
The operation is the same as that of the player, but in the case of fast-forward / fast-reverse, it takes time to search several tracks before and after the disc position where the compressed data of the audio currently output is recorded from the time when it is determined. During that time, either the voice data stored in the semiconductor memory is drained or the voice output is interrupted, and it is difficult to perform the fast forward / reverse voice output similar to the CD player. Was there.

[0005]

The above-described method of utilizing the semiconductor memory has been made possible by the progress of audio compression technology, and is very epoch-making. The present invention relates to a mini disk player in which a semiconductor memory uses a key common to a fast-forward function and a forward track number search function, and a common key to a fast-reverse function and a reverse track number search function. It also makes it possible to make the audio output at the start of fast-forward and fast-reverse look like a CD player.

One object of the present invention is to use a key common to the fast forward function and the forward direction track number search function,
In addition, in a mini disk player that uses a common key for the fast rewind function and the reverse track number search function, the CD output looks like the audio output at the start of fast forward and fast rewind.
The aim is to provide a mini disc player that can be similar to the player. One object of the present invention is to use a key common to the fast-forward function and the forward direction track number search function, and to use a key common to the fast-reverse function and the backward direction track number search function in a mini-disc player. The purpose is to utilize the semiconductor memory to make it possible to make the audio output at the start of fast-forward and fast-reverse look like a CD player. One object of the present invention is to use a key common to the fast-forward function and the forward direction track number search function, and to use a key common to the fast-reverse function and the backward direction track number search function in a mini-disc player. It is to provide a system control algorithm that enables the audio output at the start of fast-forward and fast-reverse to look similar to that of a CD player.

[0007]

SUMMARY OF THE INVENTION The present invention uses a common key for the fast forward function and the forward track number search function, and a common key for the fast rewind function and the reverse track number search function. (EN) A mini disc player that provides the same audio output as that of a CD player at the start of fast forward and fast reverse in a mini disc player. Further, according to the present invention, it is possible to eliminate the uncomfortable feeling of delay in audio output that occurs at the start of fast forward or fast reverse in a mini disc player. Also,
According to the present invention, it is a problem that the mini-disc player uses the common key for the fast-forward function and the forward direction track number search function, and also uses the fast-reverse function and the reverse direction track number search function for the common key. It is possible to carry out the present invention without any further, and it is possible to reduce the size of the mini disc player by reducing the number of keys.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a mini disc player according to the present invention will be described with reference to FIGS. 1 is a block diagram of hardware, FIG. 2 is a conceptual diagram showing a semiconductor memory usage state and a pickup position and its time chart, FIG. 3 is a conceptual diagram showing a semiconductor memory read address usage state, and FIG. 4 is a PAD chart. Is.

In the figure, 1 is a mini disk, 2 is an optical pickup, and 3 is an R for amplifying a signal captured by the pickup.
F amplifier, 4 is a servo circuit block for controlling the motor to make the pickup follow the signal of the disc, 5 is a slide motor for sending and returning the pickup in the radial direction of the disc, and 6 is the rotation of the disc Spindle motor, 7 is an address decoder that reads the address recorded on the disc before recording audio, and 8 is the AC of the EFM signal recorded on the disc
EF that solves IRC and decodes disk address
M / ACIRC decoder, 9 is a semiconductor memory control circuit block for managing the address of the semiconductor memory,
Reference numeral 10 is an audio decompression decoder for decompressing and expanding compressed data, 11 is a D / A converter for converting a digital signal into an analog audio signal, 12 is a semiconductor memory,
Reference numeral 13 is a display device, 14 is a key input unit for an operator to input data, and 15 is a microcomputer which controls the entire system.

Next, an embodiment of the present invention is shown in FIG.
An explanation will be given based on the following assumptions based on the D chart. Prerequisite When the fast forward / forward direction track number search (or fast reverse / reverse direction track number search) key (hereinafter referred to as the first (or second) key) is pressed, before the time t elapses thereafter. If the key is released, the forward track number search function (or reverse track number search function) is performed, and if the key is still pressed after time t, fast forward (or fast rewind function) is performed.

When the first (or second) key is pressed while tracing the point B on the mini disc 1 in FIG. 1, and the key is not released before the time t has passed from that point. , Time t since the first (or second) key was pressed
Let A be the disk position where the compressed data of the audio data that should have been output later is recorded.

Further, a data area whose head is several tracks ahead (or ahead) from the point A is c (or b).
Here, the number of tracks from the point A to the c (or b) area and the range of the c area (or b area) are arbitrarily determined according to the speed of the fast-forward (or fast-reverse) function.

A data area starting several tracks (or ahead) from the c area (or b area) is d (or a)
Then, while the fast forward (or fast rewind) function is being performed after a predetermined number of tracks after (or before) that area, some areas to be stored in the semiconductor memory are determined as the predetermined areas. Shall be.

S1 Reading of compressed data, storage of compressed data, decompression of recorded data, and output of decompressed voice. (Step 1) Using the pickup 2 shown in FIG.
Start reading the above compressed data. The read compressed data is taken into the RF amplifier 3 and is used for EFM / AC.
The ACIRC is solved by the IRC decoder 8 and written in real time to a part of the semiconductor memory 12 by the semiconductor memory control circuit 9.

The compressed data can be read in a fraction of the time during which the data is actually expanded and output as voice. When arbitrary compressed data is accumulated in the semiconductor memory 12, the compressed data is extracted from the semiconductor memory 12,
The voice decompression decoder 10 uncompresses the compressed data, converts the decompressed voice data into analog voice through the D / A converter 11, and outputs the voice. This operation is shown before the time axis 11 in FIG.

S2 First (or second) key press detection.
(Step 2) First (or second) by the key input unit 14 and the system control microcomputer 15 in FIG.
When it is detected that the key is pressed, the process proceeds to step 3. In this embodiment, when it is detected that the first (or second) key is pressed, the writing of the compressed data up to the disk position B to the semiconductor memory is completed, and at this time the output is performed. It is assumed that the voice being played is voice data obtained by expanding the compressed data recorded at the position before the point A on the disc. If the first (or second) key is not pressed, the state of step 1 is maintained. This operation shows the time axis 4 in FIG.

S3 Processing until the first (or second) key is released. (Step 3) Steps 6 to 1 are performed until it is detected that the first (or second) key pressed in step 2 is released.
Perform processing up to 3. When it is detected that the first (or second) key is released, the process proceeds to step 4.

S4 Processing at the time when the first (or second) key is released and when the predetermined time t has not elapsed since the first (or second) key was pressed and when it has elapsed. (Step 4) In Step 3 or Step 11, it is confirmed that the first (or second) key has been released, and at that time, the first (or second) key is released.
If the predetermined time t has not elapsed since the (or second) key was pressed, the process proceeds to step 5, and if it has elapsed, the process proceeds to step 14.

S5: Shift to track number search processing. (Step 5) A predetermined time t has elapsed since the first (or second) key was pressed.
If the first (or second) key is released before the time elapses, the fast-forward / return function is not performed and the process proceeds to the forward (or reverse) track number search process. In this case, since the sound is temporarily stopped and the search target track is searched, it is possible to shift to the track number search by the same operation as the conventional CD player.

S6 While continuing the expansion and audio output of the data stored in the semiconductor memory, c (or b)
Search the beginning of the area. (Step 6) From this point, until the predetermined time t elapses after the first (or second) key is pressed, the forward (or reverse) track number search is performed thereafter, or the fast forward is performed. Cannot determine whether to move to (Fast rewind). When moving to the forward (or reverse) track number search, the sound is temporarily interrupted and the search target track is searched, so it is possible to perform the same operation as a CD player, but fast forward. When moving to (fast rewind), compression that is recorded several tracks ahead (or before) of the disk position where the data that outputs audio when the transition to fast forward (fast rewind) is determined is determined. It is necessary to decompress the data and output the audio without interruption. Actually, it takes time to search the disk position where the data to be output is recorded, so whether the audio is interrupted until the search is completed. It is impossible to make the appearance of the CD player the same as that of the CD player, because the compressed data stored in the semiconductor memory must be drained. That.

Therefore, the disk position where the sound output when the time t has elapsed since the first (or second) key was pressed is set as point A in FIG. 1 and several tracks ahead ( Alternatively, the search for the head position of the area c (or b) whose head is the previous (disc) position is started at this point. As for voice, until the time t elapses after the first (or second) key is pressed, the data currently output as voice is continuously expanded and the data stored in the semiconductor memory is output as voice. The data stored at the addresses indicated by i to j in FIG. 3 is the data output as voice during this time t. This operation is performed on the time axis 4 to 6 in FIG.
It shows up to.

After the S7 search is completed, the data in the c (or b) area is written in the semiconductor memory from the address next to the semiconductor memory address in which the data at the disk position A is stored. (Step 7)

The disk position A point where the audio is output after the time t has elapsed so that the audio can be played fast forward (or fast rewind) without a break when the time t has elapsed since the first (or second) key was pressed. The data in the c (or b) area is written to the semiconductor memory from the next address (semiconductor memory address indicated by j in FIG. 3) of the semiconductor memory address in which the data is stored. This operation is shown in FIG.
The time axis between 6 and 8 in FIG.

S8 After the writing of the c (or b) area is completed, the head of the d (or a) area that is several tracks ahead (or before) of the c (or d) area is searched. (Step 8)

In order to carry out fast-forward (or fast-reverse) reproduction so that there is no break in the sound, it is necessary to store data several tracks ahead (or before) in the c (or d) area. Therefore, after the writing of the c (or b) area to the semiconductor memory is completed, the head position of the d (or a) area which is several tracks ahead (or before) of the c (or d) area is searched. This operation is shown between time axes 8 to 10 in FIG.

S9: Wait for the time t to elapse after the first (or second) key is pressed. (Step 9) The fast-forward (or fast-reverse) reproduction is started when the time t has elapsed since the first (or second) key was pressed. Until then, the process of step 10 is performed.

Pause at the beginning of the S10 d (or a) area. (Step 10) It is possible to store the data in the d (or a) area in the semiconductor memory before starting the fast-forward (or fast-reverse) reproduction, but in the present embodiment, fast-forward (or fast-reverse) is performed. When the key is released during playback, if there is a difference between the disk position where the output audio data is recorded and the current trace position, the disk position where the audio output data is recorded when the key is released is searched. Since it takes time, it is decided to wait for the data in the d (or a) area to be stored in the semiconductor memory until the expansion of the data in the area c and the audio output are started in order to eliminate the difference. Therefore, the pause state is maintained at the head position of the d (or a) area until the fast-forward (or fast-reverse) reproduction is started. This operation is shown between the time axes 10 and 11 in FIG.

S11 Processing from the time t has elapsed after the first (or second) key is pressed until the first (or second) key is released. (Step 11) If the first (or second) key is kept pressed even after the time t has elapsed since the first (or second) key was pressed, fast-forward (or fast-reverse) playback is started. . At the time of fast-forward reproduction, the processing shown in step 12 and step 13 is performed. Since the audio output is only reproduced in the order stored in the semiconductor memory, it is possible to realize fast forward (fast rewind) reproduction without interruption. When the first (or second) key is released after this time point, the process proceeds to step 14.

S12 Before all the data stored in the semiconductor memory is output as voice, the compressed data recorded in an arbitrary area from the currently paused position is written in the semiconductor memory. (Step 12) At this point, the semiconductor memory stores data for an arbitrary area, but the area several tracks ahead (or before) is still stored because the pause state is held at the beginning. It has not been.

At this point, audio output is started while decompressing the data for the currently stored area, and at the same time, the compressed data of a predetermined area, which is a few tracks ahead of the current pause, is written to the semiconductor memory. To start. The compressed data of the area d (or a) that has been paused in step 10 is also started to be written in the semiconductor memory from this point. This operation is performed on the time axis 1 in FIG.
It shows between 1 to 13 and 16 to 18.

S13: Search several tracks ahead (or before) of the written area and pause after searching. (Step 1
3) For the same reason as described in step 10, until the expansion of the data in the area written in step 12 and the audio output are started, the data of an arbitrary area several tracks ahead is stored in the semiconductor memory. Since it is necessary to wait, the beginning position of a predetermined area a few tracks ahead is searched during that time, and it is made to wait in a pause state. This operation is shown between the time intervals 13 to 16 in FIG.

S14 Fast forward (or fast rewind) function stop. (Step 14) If the first (or second) key is released during fast-forward (or fast-reverse) playback in steps 12 and 13, the last data of the data currently remaining in the semiconductor memory The disk position where is recorded is searched before the audio output of the data is completed, and thereafter, the operation similar to the normal play state is performed. In the embodiment of the present invention, since there is almost no difference between the current trace position and the disc position where the audio output data is recorded, the play state is generated when the key is released without interruption of the audio. It is also possible to move to.

[0033]

According to the present invention, also in the mini disc player, the common key is used for the fast-forward function and the forward direction track number search function, and the common key is used for the fast-reverse function and the backward direction track number search function. It can be done without any problems, and it can be made compact by reducing the number of keys.

[Brief description of drawings]

FIG. 1 is a hardware block diagram showing an embodiment of a mini disk player of the present invention.

FIG. 2 is a conceptual diagram and a time chart showing an embodiment of a mini disc player of the present invention.

FIG. 3 is a conceptual diagram showing a usage state of a semiconductor memory showing an embodiment of a mini disk player of the present invention viewed from a storage address of the semiconductor memory.

FIG. 4 is a PAD chart showing an embodiment of a mini disc player of the present invention.

[Explanation of symbols]

1 Mini Disc 2 Optical Pickup 3 RF Amplifier 4 Servo Circuit 5 Slide Motor 6, 7 Address Decoder 8 EFM / ACIRC Decoder 9 Semiconductor Memory Control Circuit 10 Voice Expansion Decoder 11 D / A Converter 12 Semiconductor Memory 13 Display Block 14 Key Block 15 System Control microcomputer

Claims (1)

[Claims] 1. A mini disk player for reproducing a mini disk having a cluster number and a sector number, a reproducing means for audio compressed data recorded on the mini disk, a means for storing the audio compressed data in a semiconductor memory, and an audio. Decompressing means for compressed data, fast-forwarding function, first key for searching forward track number, first key
A first discriminating means for discriminating between fast-forwarding and forward direction track number search depending on the time during which the key is pressed.
The reproduction includes a fast-reverse function and a second key for performing a backward track number search, and a second discriminating means for discriminating between a fast rewind and a backward track number search depending on the time during which the second key is pressed. Using the fact that the time required for expanding the stored data by the expanding means and outputting the sound is longer than the time for storing a predetermined amount of data read from the disk by the storage means and the storage means. The compressed data of the audio to be output at the time when the determination is made is recorded during the time when the determination is made after the key having the first and second determination means is pressed. When searching the front and rear of the disc position and determining that the result of the above determination is the fast-forward function or the fast-reverse function, there is no discomfort in the output sound and there is no discontinuity from the preceding and succeeding sounds. Mini disc player was characterized by performing the play was.