JPS6013353A - Reproducing device of disc data - Google Patents

Abstract

PURPOSE:To obtain a device capable of recovering automatically to the operating state kept immediately before hitting after the input voltage is restored in spite of the hit of the input voltage during the operation of a reproducing device by providing the titled device with a control means reading out various data immediately before input voltage drops less than a prescribed level by a storage device and restarting the titled device. CONSTITUTION:When a voltage detecting circuit 6 detects that the input voltage to a main power supply circuit drops less than V1, a disc loading discriminating means 411 detects whether the disc is loaded to a reproducing part 5 or not from the output of a disc detecting sensor. Since no loading of the disc informs no operation of the reproducing device, the reproducing device is unloaded from the processing routine without any operation. When the loading of the disc is detected, the reproducing device executes some operation. Therefore, a reproducing part operation control means 410 executes processing for interrupting the operation of the reproducing device, an RAM control means 412 stores data necessary for the restarting of the interrupted operation in an RAM42 and then executes protection processing for preventing the contents of the RAM from being rewritten erroneously during the drop of the input voltage to the main power supply, and finally, the reproducing device is unloaded from the processing routine.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Use (2 pages) The present invention relates to a disc data reproducing apparatus for reproducing audio data or image data recorded on a disc such as a digital audio disc or a video disc, and particularly to While the disc is in operation (playing, pausing,
If the power supply voltage returns to normal after the operation is interrupted due to a drop or interruption of the power supply voltage during fast forwarding, fast reversing, etc.),
The present invention relates to a disc data reproducing device that can resume operation from the state immediately before interruption.

Conventional configuration and its problems In a conventional disc data playback device, when the input voltage is temporarily cut off and then restored while the disc is in an operating state, the operating state of the playback section is reset once and the disc is not inserted. It will perform the same operation as if it were newly installed.

When considering such a disc data playback device for use in a car, it is important to note that while the playback unit with the disc attached is in operation (for example, during play, pause, fast-forwarding, etc.), it is possible to If the input voltage is cut off or reduced,
3 pages are often generated, and it is inconvenient to use the device because the operation of the device is reset each time.

OBJECTS OF THE INVENTION The present invention eliminates the problems of the prior art, and even if the input voltage is momentarily interrupted while a disc is loaded and the playback device is operating, after the input voltage is restored, The present invention provides a disc data reproducing device that can automatically return the reproducing device to the operating state immediately before a momentary interruption.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention detects the input voltage to the main power supply circuit of the reproducing section with a voltage detection circuit, and when the input voltage is at a predetermined level or higher, various kinds of information related to the operating state of the reproducing section are detected. Data (for example, operation modes such as play, pause, fast forward, fast reverse, etc., the currently playing address during play, the start address of the song when searching for the beginning of the song by fast forwarding, display contents to be displayed on the display, etc.) is written in the storage device, and when the input voltage once falls below a predetermined level and then returns to a predetermined level or above, various data immediately before falling below the predetermined level is read from the storage device, and the reproducing unit is activated when the input voltage falls below the predetermined level. The present invention is characterized in that it is provided with a control means for returning to the operating state immediately before the current state and restarting the operation.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. Note that this embodiment is an in-vehicle digital audio disc playback device.

In FIG. 1, 1 is a switch that constitutes a part of the ignition switch of an automobile, and this switch] is
It turns ON when the key is in the ACC and ON (engine running state) positions, connects the battery and the input terminal of the main power circuit described below, and turns OFF at other times, including the 5TART (engine starting state) position. to disconnect the battery and the input terminals of the main power circuit. Therefore, for example, when the key position of switch 1 is set to ACC and the playback device is operating, if the key position is set to 5TART and the engine is started, and then returned to the ON position after starting, the main power circuit input on page 5 of the playback device will be It is often shut off once when the engine is started. Reference numeral 2 denotes a power supply unit composed of a main power supply circuit 21 and a sub-power supply circuit 22, and the main power supply circuit 2] connected to the battery by the above-mentioned switch serves as a power source for an operation display unit, a control unit, and a playback unit, which will be described later. becomes. In addition, the sub power supply circuit 22 to which the battery output is directly inputted is not used as a power supply for the RAM (Random Access Memory) in the control unit, which will be described later, and supplies voltage to the RAM at all times, including while the switch 1 is OFF. supply

3 is an operation display section consisting of a display section 31 and an operation key section 32, and the display section 31 displays, for example, the number of the song currently being played;
Displays the elapsed performance time and the operation mode of the playback device (play mode, pause mode, fast forward mode, fast reverse mode, etc.). The operation key portion 32 is still composed of push buttons for selecting operations of the playback device. 4 is a control circuit 41 consisting of a central processing unit (CPU), etc., and a RAM.
42. Note that the control circuit 41
It is also possible to use a so-called one-chip CPU in which the CPU and RAM 42 that constitute the CPU and the RAM 42 together have six pages. The control circuit 41 receives key manual information from the operation keys 32 of the operation display section 3 and controls the motor of the playback section,
In addition to controlling operations such as optical pickup, information to be displayed, such as operation mode information of the device or playback unit 5
Information on the number of the song currently being played, information on the elapsed performance time, etc. obtained from the display unit 32 is transmitted to the display unit 32 and displayed. The RAM 42 is
After the switch 1 is turned OFF, the various data stored while the switch 1 is ON is supplied with voltage from the sub power supply circuit 22 and held.
It has a function of determining whether the output voltage of the output voltage is at a normal level or not and indicating it as a flag.

Reference numeral 5 denotes a playback unit that performs insertion and removal of a disc, drives the rotation of the disc, controls the position of the optical pickup amplifier, reads data from the disc, processes data, etc., and outputs a playback signal. controlled by Reference numeral 6 denotes a voltage detection circuit for detecting whether the output terminal voltage of the switch 1 is equal to or higher than a predetermined level 71, and the output of this voltage detection circuit 6 is input to the control 7 vane 5i circuit 41.

Here, the input voltage of the main power circuit 2 is from ■ to ■2 (operation display section 3, control circuit 4), and the main power circuit output voltage, which is the power supply voltage for the reproduction section 5, is a constant voltage ■.

2 is T. (The voltage detection circuit 6 is
It is necessary to set ■I + ■2 + T12TTO so that it is larger than (the time required for the control circuit 41 to execute the low voltage detection processing routine shown in FIG. 3 after detecting the following) ( (See Figure 2).

Next, the operation after voltage drop detection and voltage recovery detection in the above embodiment will be explained. Note that FIG. 5 shows the configuration of the present invention in functional blocks.

FIG. 3 shows that the voltage detection circuit 6 of FIG.
Fig. 12 is a flowchart of the processing operation of the control circuit after detecting that the input voltage to the input voltage has become 1 or less.

When the voltage detection circuit 6 detects that the input voltage to the main power supply circuit 21 has become lower than v1, the disc is first inserted into the playback section 5 in step 101 in FIG.
353 (9) The disk attachment determining means 411 detects whether or not a disk is attached from the output of a disk detection sensor (not shown) of the playback unit 5, and if a disk is not attached, it is determined that the playback device is not in operation. Therefore, do nothing and exit from this processing routine. On the other hand, when it is detected in step 101 that a disc is loaded, the playback device is performing some operation, so the playback unit operation control means 4.10 performs processing to interrupt the operation (for example, playback) in step 102. If it is inside, after rotating the disk, operating the optical pickup, reading data from the disk, stopping the output of the reproduction signal, etc., the RAM control means 412
After storing the data necessary to resume the interrupted operation in R and AM42, protection processing (write protection processing) is performed to prevent the RAM contents from being erroneously rewritten during a drop in the main power supply input voltage, and this processing routine is terminated. Get out. In addition, the above-mentioned time T is the time from when the voltage V1 or lower is detected until the processing of steps 10] to 103 is completed.

must be shorter than T12.

Page 9 Next, the voltage recovery processing routine when the voltage is recovered will be explained with reference to FIG.

When the voltage detection circuit 6 detects that the main power supply input voltage has returned to 71 or higher, in step 201, the disk attachment determination means 41 first determines whether or not a disk is attached.
1, and if not, the disc was not installed at the time of the voltage drop (or cutoff), so the process waits for the disc to be installed in step 202, and then starts the normal playback operation in step 203. Perform processing.

If it is determined in step 201 that a disc has been loaded, the operation of the playback device is interrupted due to a voltage drop (or cutoff), and the main power circuit input voltage is first dropped (or cut off) in step 204. The RAM voltage drop determination means 413 determines whether the output of the RAM power supply (auxiliary power supply circuit 22) has maintained a normal level during the period of time.
It is determined by the flag (not shown) in AM42, and if it is held, it is determined that the contents of RAM42 have not been erroneously rewritten, and in step 205, the RAM data pager is read and based on this data. In step 206, processing is performed to return to the state immediately before the operation was interrupted. Also, step 20
If it is determined in step 4 that the RAM power supply does not maintain the normal level, the RAM data may have been erroneously rewritten, so do not use the RAM data to recover from an interruption in operation. The process goes to the normal operation start routine 203. In addition, in FIG. 5, 414 is a key data importing means for importing key data from the operation key part 32;
415 is a display output means for outputting display data to the display section 31.

Effects of the Invention The present invention has the above-described configuration.According to the present invention, even if the operation of the playback device is interrupted due to a drop in the main power supply voltage or interruption, data regarding the operating state of the playback device immediately before the interruption can be stored. The main power input voltage is maintained in a RAM that is supplied with voltage from a sub power supply circuit separate from the main power circuit (the input to the sub power circuit maintains a predetermined level even when the main power circuit input is reduced or cut off). When the data is restored, it is retained in the RAM.5. It has the advantage of being able to return to the state immediately before the interruption of operation by using the data necessary to restore the operation, and is particularly effective as a disk data reproducing device for automobiles where the input voltage is likely to be interrupted or decreased.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a disc data reproducing device according to an embodiment of the present invention, FIG. 2 is a diagram showing changes in the main power circuit input voltage of the device, and FIGS. 3 and 4 are flowcharts of the device. , FIG. 5 is a functional block diagram of the main parts of the present invention. DESCRIPTION OF SYMBOLS 1... Switch, 2... Power supply part, 21... Main power supply circuit, 22... Sub-power supply circuit, 3... Operation display part, 31
...Display unit, 32...Part of operation keys, 4...Control unit, 41...Control circuit, 42...Random access memory (RAM), 5...Reproduction unit, 6...・Voltage detection circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
figure moe

Claims (1)

[Claims] a voltage detection means for detecting whether the input voltage to the main power supply circuit of the reproducing section is above a predetermined level; storage means for holding while the input voltage to the power supply circuit is lower than a predetermined level; and writing data regarding the operating state of the reproduction section to the storage means when the input voltage to the main power supply circuit is equal to or higher than the predetermined level. , when the input voltage to the main power supply circuit becomes lower than a predetermined level, the operation of the reproduction section is interrupted, and when the input voltage to the main power supply circuit returns to a predetermined level or higher thereafter, the storage means A disc data reproducing device comprising a control means for reading data from the reproducing section and returning the operation of the reproducing section to the state immediately before the operation was interrupted.