KR100226975B1 - Playback Control Method of Compact Car Player - Google Patents

Abstract

The present invention relates to a playback control method of a compact disc player for a vehicle in which the next playback operation of the disc can be executed immediately from the previous playback position when the disc is not reloaded from the deck of the vehicle CD player. To this end, the present invention, when the compact disc player is in the standby mode or playback mode, checking the input of the deck open key signal according to the user operation; When the deck open key signal is input, executing the deck open mode to open the deck and simultaneously storing, in the memory means, information on the previous play position of the compact disc currently inserted in the deck; Checking whether the compact disc inserted in the deck is ejected for a predetermined time; As a result of the check, when the compact disc currently inserted into the deck is ejected within a predetermined time period, clearing control index information and previous playback position information of the extracted compact disc stored in the memory means, and switching to the standby mode; Reloading the compact disc currently inserted into the deck if the compact disc currently inserted into the deck is not taken out for a predetermined time as a result of the check; And searching for the previous playback position of the reloaded compact disc based on the previous playback position information stored in the memory means, and then executing the playback mode to automatically play back songs from the previous playback position.

Description

Playback Control Method of Compact Car Player

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of controlling the reproducing operation of a compact disc (CD), and more particularly to a method of controlling the continuous reproducing of an automobile CD mounted on a vehicle.

As is well known, compact discs are a non-contact playback system that reflects a laser beam into fine grooves recorded on plastic discs of several centimeters in diameter (e.g. 12 centimeters), which optically picks up the digital signals recorded inside the disc. to be.

On the other hand, such a compact disc contains a real program (index information for control, actual data information such as audio, etc.) between a lead-in area and a lead-out area. When loading is performed, the index information (also referred to as supplementary information or subcode) of the TOC (Table of Contents) for control in the lead-in area of the disc is read and stored in a predetermined memory (RAM) space. For example, information on the number of songs recorded on the disc, position information of each song, song number information, index information, performance time information of each song, and the like.

Therefore, even if the user selects any song (or track) while the disc is loaded into the player, since the control information for random access is already read and stored, random access can be performed quickly.

On the other hand, a compact disc (CD) player mounted on a vehicle is a control system that detects this by a sensor mounted on a part of the deck when the driver (or passenger) pushes the disc into the disc inlet of the deck for disc loading. The disk drives the loading motor to mount the disc on the deck, and then immediately proceeds to the play mode to control the disc play operation. This is because the compact disc player for a vehicle is mostly used while the vehicle is in operation, so as to minimize the impediment to safe operation due to the operation of the disc player.

On the other hand, when the user presses the disc open key, the loading motor is driven in the opposite direction to remove the disc from the deck and simultaneously read and store the disc index information of the TOC, for example, the number of songs contained on the disc. Clear all data such as position information of each song, song number information, index information, playing time information of each song, disc type information, and previous play position information.

At this time, the vehicle CD player is not ejected or pushes the disc again in the current deck for a predetermined time, for example approximately 10 seconds when the disc is opened according to the user's disc open key operation. In this case, the disk is automatically reloaded, and the loading and unloading of the disk is detected by a sensor mounted on a predetermined portion of the deck. This is to prevent disk damage due to user error when the disk is left open continuously.

Therefore, when the disc is not ejected and the reloading operation is performed, as described above, the index information (also referred to as additional information or subcode) of the TOC for the control contained in the lead-in area of the loaded disc is read and a predetermined memory is read. (RAM) is stored in the space, and then the playback mode is immediately executed by cracking from the first playback position of the disc.

However, in the conventional control method as described above, since the index information of the TOC for the disc is not cleared already, the index information of the TOC must be read again, which causes unnecessary time before the playback song is output. There is.

In addition, according to the conventional playback control method, if the user presses the open key by mistake during the playback of the CD player, or if the user reinserts the disk because the user is not willing to change the disk, it is already once before the predetermined time. The song you listened to will be played back from the beginning, which will never be desirable playback control. That is, in this case, the playback from the position after the previously played position may be referred to as the disc playback faithful to the user's position.

Accordingly, the present invention is to solve the above-described problems of the prior art, and when the disc is reloaded to the deck due to disc withdrawal from the deck of the vehicular CD player, the next play operation of the disc is executed immediately from the previous play position. An object of the present invention is to provide a playback control method of a compact disc player for a vehicle.

In order to achieve the above object, the present invention, the control means for controlling the operation of the optical pickup for reading the data contained in the compact disk inserted into the deck, the control means for controlling the processing of the data read from the compact disk, read from the compact disk Signal processing means for signal processing a digital music reproduction signal and converting it into an analog signal to generate an audio output for the reproduction signal, and for storing control index information read from the compact disc provided from the signal processing means. CLAIMS 1. A method for controlling playback of a compact disc player for a vehicle having memory means, comprising: a first step of checking input of a disc open key signal according to a user's operation when the compact disc player is in a standby mode or a playback mode; A second step of, when the disc open key signal is input, executes a disc open mode to open the disc and at the same time stores the previous play position information of the compact disc currently inserted into the deck in the memory means; A third step of checking whether the compact disk inserted into the deck is ejected for a predetermined time; As a result of the check in the third step, when the compact disc currently inserted into the deck is ejected within the predetermined predetermined time, the control index information and the previous playback position information of the ejected compact disc stored in the memory means are cleared. A fourth step of switching to the standby mode; As a result of the check in the third step, if the compact disc currently inserted in the deck for the predetermined time is not ejected or the disc opened in the second step is pushed again, the currently inserted in the deck A fifth step of reloading the compact disc; And searching for a previous playback position of the reloaded compact disc based on the previous playback position information stored in the memory means, and then executing a playback mode to automatically play music from the previous playback position. Provided is a playback control method for a vehicle compact disc player.

1 is a block diagram of a typical playback control system suitable for applying a playback control method for a compact disc player for a vehicle according to the present invention;

2 is a flowchart showing a playback control process of a compact disc in a vehicular CD player according to a preferred embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

102: control block 103: RAM

104: servo control block 106: driver

108: optical pickup 110: detection block

112: intermediate frequency amplifier 114: DSP

116: D / A conversion block

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 shows a block diagram of a playback control system of a typical CD player suitable for applying the playback control method for a compact disc player for a vehicle according to the present invention.

As shown in the figure, a reproduction control system of a typical CD player includes a control block 102, a servo control block 104, a driver 106, an optical pickup 108, a sense block 110, and an intermediate frequency amplifier. 112, digital signal processor (DSP) 114, and D / A conversion block 116.

Referring to FIG. 1, the control block 102 is a microprocessor which performs overall operation control of a CD player. When the user operation signal is input through a key operation unit provided on the front panel of the CD player, the control block 102 is applied to the corresponding operation signal. Perform the corresponding operation control.

For example, when the disc is inserted into the deck while the disc is open, that is, when the disc insertion detection signal is input from the detection block 110, the disc is loaded by the control of the servo control block 104 and the driver 106. After mounting on the deck, the index information (also referred to as supplementary information or subcode) of the TOC (Table of Contents) for control in the lead-in area of the disc is read and stored in a predetermined memory (RAM) 103 space. At the same time as you save, the CD player runs in playback mode.

In addition, when a disc is reloaded to the deck due to disc withdrawal (i.e., a user does not withdraw a disc by accidentally opening the disc) for a predetermined time period according to the present invention, The servo control block 104 is controlled so that the next reproducing operation of the disc is immediately executed from the reproducing position.

At this time, the RAM 103 has index information of the TOC for control read in the lead-in area of the disc after the disc is loaded, that is, the number of songs contained in the disc, the position information of each song, the song number information, the index information, and the like. Data such as song playing time information, disc type information, and previous playback position information are stored.

In addition, the servo control block 104 includes a plurality of servos, for example, a focusing servo, a tracking servo, an optical transport servo, a spindle servo, an automatic power control (APC) servo, and the like. Control of the driver 106 for operating the optical pickup 108 on the basis of the control signal from the &quot;) and the focus tracking servo error signal provided from the intermediate frequency amplifier 112 described later during the reproduction operation.

At this time, although the detailed illustration in FIG. 1 is omitted, the focusing servo of the servo included in the servo control block 104 has an objective lens such that the signal surface of the disk always fits within the depth of focus of the objective lens against the bending or surface vibration of the disk. Control the vertical movement of the objective, the tracking servo controls the radial direction drive of the objective lens to accurately track the track, the optical transport servo controls the radial direction movement of the whole optical pickup, and the spindle servo The drive of the spindle motor for rotating the turntable is controlled, and the APC servo performs a function of controlling the light output of the laser diode to be kept constant.

On the other hand, the driver 106 is composed of, for example, an actuator driver, a spindle motor driver, a feed motor driver, a tray motor driver, and the like, and according to the control from the servo control block 104 described above, Control the drive.

In addition, the optical pickup 108 is composed of a semiconductor laser, an optical system composed of an objective lens and a concave lens, an optical sensor, and the like. The medium frequency signal is generated through the optical sensor.

In addition, the detection block 110 is composed of a plurality of sensors (for example, a light emitting device) at the end of the deck that can detect the disk portion of the loading / unloading deck path and the disk inserted into the deck, The open operation is completed, the disk is ejected, the disk is inserted, and the disk is loaded. The detected disk eject / insert signal is provided to the above-described control block 102.

On the other hand, the intermediate frequency amplifier 112 amplifies the digital signal (subcode signal, music reproduction signal, etc.) output from the optical sensor in the optical pickup 108 to a level that can be sufficiently processed in the next stage, and forms a waveform. After performing the signal processing process such as, it is provided to the digital signal processor (DSP) 114 of the next stage. In addition, the intermediate frequency amplifier 112 extracts an error signal for focus tracking servo from the signal output from the optical pickup 108 and provides it to the aforementioned servo control block 104.

On the other hand, the DSP 114 stores digital signals (i.e., control signal information (subcode signal) read from CD and actual data information (song reproduction signal) such as audio) provided from the intermediate frequency amplifier 112 described above. Demodulation to the data sequence of the original signal, for example, converting the channel-coded EFM signal to the 8-bit data sequence, and removing burst or random errors caused by disk damage or dust. Processing such as error correction is performed. Then, the DSP 114 provides control signal information to the above-described control block 102, and the song reproduction signal to the D / A conversion block 116.

In addition, the D / A conversion block 116 may be configured with, for example, a digital filter, a D / A converter, a low pass filter, and the like. The DSP 114 may be configured based on a predetermined oversampling frequency. The digital song reproduction signal provided from the digital signal is converted into an analog signal, that is, restored to the original analog signal. Then, the song reproduction signal restored to the analog signal will be amplified to a predetermined predetermined level through an amplifier not shown, and then output through a speaker (not shown).

Next, the process of controlling the reproduction of the vehicle CD player according to the present invention in a typical CD reproduction control system having the above-described configuration will be described in detail.

2 is a flowchart showing a playback control process of a compact disc in a vehicular CD player according to a preferred embodiment of the present invention.

Referring to FIG. 2, when the CD is inserted into a vehicle CD player or when a play mode is performed, i.e., a play operation is performed (step 202), the control block 102 opens the disc according to the user's operation. It is checked whether an open key for the input is input (step 204).

As a result of the check in step 204, if there is no input of the open key, the CD player maintains the standby mode or playback mode of the current state, and if the disc open key signal is input, performs the disc open mode, that is, the control block ( The disc is opened according to the drive control of the servo control block 104 based on the control of 102 (steps 206 and 208). When the disc opening operation is completed, the process proceeds to step 210 to check whether the disc is withdrawn. At this time, when the stop mode or the open key signal is input while the CD player is in the play mode, the control block 102 stores information about the previous play position (ie, the previous play position) of the disc currently mounted on the deck. 103).

That is, in steps 210 and 216, a predetermined n is set whether or not the disc is ejected from the deck not shown by the user based on the detection result in the sensing block 110 composed of a plurality of light emitting elements. Check for time, that is, whether there is a disk eject (DO) detection for n hours.

Next, if there is a disc ejection detection from the deck within the predetermined n hours as described above, the control block 102 clears the TOC index information and the previous playback position information of the disc stored in the RAM 103. Next (steps 212 and 214), the mode is switched to the standby mode to maintain the standby state.

On the other hand, if the withdrawal of the disc is not detected for a predetermined n time period as a result of the check in the steps 210 and 216, it is opened according to the drive control of the servo control block 104 based on the control of the control block 102. The deck is closed and the previous disc (ie, the disc currently inserted in the deck) is reloaded as is (step 218).

Then, in step 220, the previous playback position is searched based on the previous playback position information stored in the RAM 103. When the previous playback position is found, the playback mode is automatically performed after the previous playback position (step 222). ), A song reproduction signal, that is, an audio output, is generated through a speaker (not shown).

Therefore, if the user does not eject the disc from the deck for a predetermined time while the user presses the deck open key, the current disc is reloaded according to the present invention to automatically perform the play mode from the previous play position.

As described above, according to the present invention, when the user presses the disc open key and the disc is not withdrawn from the deck for a predetermined time in a state in which the disc is hung on the deck, the current disc is reloaded so that after the previous play position. By automatically executing the playback mode, i.e., controlling to play from the position previously played at the time of reloading due to the user's non-fetching of the disc, disc playback control more faithful to the user's position can be realized.

Claims (3)

Control means for controlling the operation of the optical pickup for reading the data recorded on the compact disc inserted into the deck, and controlling the processing of the data read from the compact disc; and processing the digital music reproduction signal read out from the compact disc. Playback of a compact car player for a vehicle having signal processing means for converting to an analog signal to generate an audio output for a reproduction signal and memory means for storing control index information read from the compact disk provided from the signal processing means In the method of controlling, A first step of checking input of a disc open key signal according to a user's operation when the compact disc player is in a standby mode or a playback mode; A second step of, when the disc open key signal is input, executes a disc open mode to open the disc and at the same time stores the previous play position information of the compact disc currently inserted into the deck in the memory means; A third step of checking whether the compact disk inserted into the deck is ejected for a predetermined time; As a result of the check in the third step, when the compact disc currently inserted into the deck is ejected within the predetermined predetermined time, the control index information and the previous playback position information of the ejected compact disc stored in the memory means are cleared. A fourth step of switching to the standby mode; As a result of the check in the third step, if the compact disc currently inserted into the deck for the predetermined time is not ejected or the disc is pushed again while the disc is caught in the deck, the disc is currently inserted into the deck. A fifth step of reloading said compact disk; And A sixth step of searching for a previous playback position of the reloaded compact disc based on the previous playback position information stored in the memory means, and then executing a playback mode to automatically play back songs from the previous playback position. Playback control method for a compact disc player for a vehicle. The method for controlling playback of a compact disc player for a vehicle according to claim 1, wherein the compact disc withdrawing check on the deck is performed by a plurality of sensors mounted on the loading path portion and the deck end portion of the deck. The method of controlling playback of a compact disc player for a vehicle according to claim 2, wherein each of said plurality of sensors is a light emitting element.

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