JP4061352B2 - Disc player - Google Patents

Description

  The present invention relates to a disk reproducing apparatus for reproducing a disk on which a video signal and / or an audio signal are recorded by a recording method such as magnetic recording, optical recording, and magneto-optical recording.

  A CD player, which is an example of a disk playback device, rotates a CD on which a track having the presence or absence of minute pits on the order of microns is formed, and causes an optical pickup to accurately follow the track, and laser optically detects the pits. An optical reproduction signal corresponding to the presence or absence is obtained, and the obtained optical reproduction signal is electrically processed to reproduce a digital audio signal or an analog audio signal.

  Such a CD player employs a measure that allows a sound signal to be stably reproduced even when external vibration is applied to the main body thereof, and a specific example thereof is disclosed in, for example, [Patent Document 1]. Has a shockproof playback function.

  In other words, the shock proof playback function does not read the optical signal from the CD performed by the optical pickup in real time in the same manner as the normal playback speed, and performs the reading at a high speed by rotating the CD at a high speed. Stored data in a memory called shock proof memory at high speed, and when the memory is full, reading of the optical reproduction signal from the disk is temporarily suspended, and before the memory becomes empty, the disk is again stored. The optical signal is read out by rotating at a high speed to perform a so-called intermittent reading operation that prevents the reproduced audio signal from being interrupted even when external vibration is applied to the device.

  By exhibiting such a shockproof playback function, it is possible to make a disk playback device that is resistant to external vibrations, and the capacity of the shockproof memory is such that normal sound playback can be performed within several tens of seconds. Even if vibration or the like is generated during the set time and the optical signal cannot be read, the audio signal can be properly reproduced.

Such a shock proof reproduction function works not only for CD reproduction but also for disks such as MD and DVD, regardless of whether the signal recording form is magnetic recording, optical recording, or magneto-optical recording. The playback signal format is compatible with all signal formats such as audio signal only, video signal only, video signal with audio signal superimposed, etc. Especially, the disc playback device is a battery-driven portable type that vibrates. This is a useful function when a lot is given.
JP 2000-090449 A (Technical content is disclosed in [0011])

  When a stop key for giving a stop command is pressed during such reproduction, the stored data already stored in the shock proof memory is simultaneously controlled when the rotating disk is controlled to stop. Is forcibly erased, so that the generation of reproduction data is terminated.

  In the conventional disk reproducing apparatus, it is considered that the stop key is pressed during disk reproduction in the following first and second cases.

  In the first case, the current playback operation is interrupted and completely stopped, and in the second case, the currently playing disc is replaced with another disc and a new disc is played back. It will be performed subsequently.

  Therefore, although there is no particular problem in the first case, in the second case, the playback of the currently loaded disc is stopped, the disc rotation is stopped and the playback mode is terminated, and then a new one is newly created. It takes at least a few seconds to a few tens of seconds to start playback of the loaded disc, and during that time no playback information such as audio is output.

  In this non-playback state, a silence or no-video state in which the information signal is not reproduced continues, so that the user who wants to listen to music continuously cannot be satisfied.

In addition, when the stop key is pressed to shift to the stop mode, and playback information is obtained using the data stored in the shock proof memory, the disc is rotating at high speed while the disc is rotating at high speed. When the door is opened and the disk is replaced with a new one, there is a problem in that there is a risk that fingers may touch the rotating disk.

  Therefore, an object of the present invention is to enable disk replacement without touching a rotating disk while reproduction of data stored in a memory is continued, and to minimize the time of silent or no video state in which an information signal is not reproduced. An object of the present invention is to provide a disc reproducing apparatus capable of performing the above.

  In order to solve the above-described problems, the disc reproducing apparatus according to the present invention employs the following characteristic configuration.

(1) In a disc reproducing apparatus in which a disc on which an information signal is recorded is mounted on a reading device, the information signal is read out and stored in a memory, and stored data is retrieved from the memory and the information signal is reproduced.
When a command to make a stop state is given, a continuous playback mode is provided in which the data already stored in the memory is taken out and the information signal is continuously played back. When given for the first time, a command is given for the second time to take out the data already stored in the memory and continue the reproduction output of the information signal to shift the disk to the stopped state and put it into the stopped state. A disc reproducing apparatus configured to stop reproduction output of data already stored in the memory when the data is reproduced.

  (2) The continuous playback mode is configured to shift to a complete stop state after fetching all data already stored in the memory when a command to stop the disk is given. 1) The disk reproducing apparatus according to 1).

  Since the disc playback apparatus according to the present invention has a continuous playback mode in which data already stored in the memory is taken out and the information signal is continuously played back when a command to stop the disc is given. When the stop key is pressed, reproduction based on the data remaining in the memory can be performed, and the silence or no video state in which the information signal is not reproduced can be reduced as much as possible.

  In addition, when the stop key is pressed, the memory reset operation and playback control operation are reliably performed, and the command operation for that can be performed without any hassle, and the customer satisfaction of the user who wants to listen to music continuously is remarkably increased. When the disk is replaced from the playback state of the data stored in the memory, there is no finger touching the rotating disk, and the silent or no-video state time when the information signal is not reproduced as much as possible It is possible to provide a disc reproducing apparatus that can be reduced to a minimum.

  An embodiment of the present invention will be described as [Example 1] with reference to FIGS. In this example, the present invention is applied to a CD player that reproduces a disc (CD) on which an audio signal has been recorded, and the CD player is configured as a battery-driven portable type.

  In FIG. 1 showing the entire configuration of the disk reproducing apparatus, a main microcomputer 1 for controlling the entire apparatus in a complex manner is provided, and a signal processing circuit 2 is connected to the main microcomputer 1.

  The signal processing circuit 2 is for appropriately performing a series of processes for finally converting the optical signal read from the disk into an analog audio signal. The disk is rotationally driven by the spindle motor 5. Further, the optical pickup 3 driven in the radial direction of the disk by the thread motor 4 is configured so that the disk pit can be read.

  The RF amplifier 6 interposed between the optical pickup 3 and the signal processing circuit 2 is up to about several V required for processing the optical signal of the order of several μV read by the optical pickup 3 in the signal processing circuit 2. The amplifier 7 is configured to amplify, and the driver 7 controls the spindle motor 5 so that the disk rotation is appropriate, and controls the sled motor 4 so as to be driven to a target track position. 3 is irradiated with a laser beam in a focused state on the disk pit, and appropriate tracking control is performed.

  The shock proof memory 8 connected to the signal processing circuit 2 intermittently processes a signal obtained by processing the signal read by the optical pickup 3 at a speed faster than the normal reproduction speed from the disc on which the information signal has been recorded. Is a memory for retrieving stored data at a speed slower than the writing speed at that time and obtaining a final disc playback signal, and is set to a memory capacity corresponding to a regular playback time of several tens of seconds. ing.

  A D / A converter 9 connected to the digital output terminal of the signal processing circuit 2 converts a digital reproduction signal obtained by reproducing an optical recording signal recorded on a disk into an analog audio signal. The analog audio signal output from the A / A converter 9 is amplified to a predetermined line signal level by the audio amplifier circuit 10 and supplied to a speaker via a main amplifier (not shown) or supplied to headphones via a headphone amplifier. The

  A battery detection circuit 11, a display unit 12, a key input unit 13, and a playback mode switch 14 are connected to the main microcomputer 1, and the battery detection circuit 11 is a power source battery (not shown) for operating the disk playback device. It detects the state and generates a voltage detection signal for displaying the remaining battery level and for performing a low voltage alarm.

  The display unit 12 displays a variety of displays such as a picture representing a disk operation state, a bar graph of a playback audio output level, a playback signal spectrum analyzer display, a current playback time, a remaining playback time, a track number, and a total playback time display. Is.

  The key input unit 13 is composed of a plurality of keys for instructing various operations related to disk reproduction, and includes a reproduction key 13A for instructing a reproduction operation and a stop key 13B for instructing an operation stop. And a variety of key buttons such as a pause command, a previous song playback command, a next song playback command, and an arbitrary song playback command.

  The playback mode switch 14 is a main part of the present invention, and is used for arbitrarily selecting (switching) two modes of the normal playback mode and the continuous playback mode. The normal playback mode is a stop key 13B. Is pressed, the playback operation is shifted to the stop state without retrieving the data already stored in the shock proof memory 8, and the continuous playback mode is performed when the stop key 13B is pressed. This is a state in which the reproduction operation is continued without erasing data already stored in the shock proof memory 8, and is also referred to as a CP mode (Continuous Play Mode).

  Accordingly, the following two playback modes, the normal playback mode and the continuous playback mode, can be arbitrarily selected.

  That is, in the normal reproduction mode, when the main microcomputer 1 detects that the stop key 13B is operated, the reproduction operation of the disc is performed without taking out the data already stored in the shock proof memory 8. In this mode, all control of the thread motor 4 and the spindle motor 5 is shifted to the servo stop state.

  In the continuous playback mode, when the main microcomputer 1 detects that the stop key 13B is operated, the data already stored in the shock proof memory 8 is taken out and the information signal (audio signal) is continuously reproduced. It is.

  As shown in the flowchart of FIG. 2, the detailed operation of the disc playback apparatus having the above configuration is as follows. When the operation of the disc playback apparatus starts, it is first determined in step S1 whether or not the disc is being played back. In the case of No, the process is forcibly terminated, and in the case of Yes, the process proceeds to the next step S2, and whether or not the stop key 13B has been pressed is determined by being detected by the main microcomputer 1. In the case of No, step S2 is re-executed, and when the answer is Yes, the process proceeds to step S3.

  In step S3, the main microcomputer 1 detects the state of the reproduction mode switch 14 to determine whether or not the CP mode (continuous reproduction mode). If yes, the process proceeds to the next step S4. The rotation of the spindle motor 5 is controlled and stopped via the signal processing circuit 2 and the driver 7, and simultaneously, the servos of both the optical pickup 3 and the thread motor 4 are turned off, and the process proceeds to step S5.

  In the case of No in step S3, that is, in the normal playback mode, the process proceeds to step S8, the rotation of the spindle motor 5 is controlled from the main microcomputer 1 through the signal processing circuit 2 through the driver 7, and stopped. At the same time, the servos of both the optical pickup 3 and the sled motor 4 are turned off, and the series of operations is completed.

  The previous step S5 determines whether or not the second stop key 13B has been pressed after determining whether or not the stop key 13B has been pressed in step S2. In the case of Yes, In step S9, reproduction output is stopped.

  If No in step S5, that is, if it is determined in step S2 whether or not the stop key 13B has been pressed, the process proceeds to step S6 if the stop key 13B is not pressed again.

  Step S6 detects the presence or absence of the remaining amount of data already stored in the shock proof memory 8, and when there is a remaining amount (in the case of Yes), step S5 is re-executed and there is no remaining amount. When it is determined (in the case of No), the process proceeds to step S7 to be in a complete stop state, and the series of operations is completed.

  If the stop key 13B is pressed for the first time while the disc is being played with the playback mode switch 14 set to the CP mode (continuous playback mode), it is already stored in the shock proof memory 8. The sound reproduction operation can be continued until the remaining data in the shock proof memory 8 is exhausted without deleting the recorded data. In addition, when the stop key 13B is pressed again for the second time after the stop key 13B is pressed, the reproduction output is interrupted to shift to the stop state.

  If the remaining amount of the shock proof memory 8 is exhausted before the second stop key 13B is pressed, the complete operation is terminated and the series of operations is completed.

  In the continuous playback mode, when a command for stopping the disc is given for the first time by the stop key 13B, the data already stored in the shock proof memory 8 is taken out and the information signal is continuously reproduced. Yes, the disk rotation stops. Further, when a command to put the disk in the stopped state is given for the second time, the reproduction output of the data already stored in the shock proof memory 8 can be stopped, and the state can be shifted to the complete stopped state.

  The disk reproducing apparatus according to the present invention is not limited to the above-mentioned [Embodiment 1], and various modifications can be adopted without departing from the scope of the invention.

  That is, in the present embodiment, the description has been made based on the example in which data is stored in the shock proof memory by high-speed reading. However, the present invention is not limited to this. The present invention can be applied in the same manner as described above as long as the obtained information signal is once stored in the memory and reproduced and output.

  In addition, the disc can be used not only for a CD on which an audio signal is recorded, but also for all cases where a video signal and / or an audio signal has been recorded, and can also be applied to pure computer data. The recording medium for forming the disk may be any of a magnetic recording medium, an optical recording medium, and a magneto-optical recording medium, and may be a DVD or MD as well as a CD. Any of a disk, a recordable disk, and a rewritable disk may be used.

  In addition, an operation button for instructing to open a door that can be driven between a position that covers an opening where a disk can be mounted / removed and a position where it is exposed may be used as a stop key according to the present invention. May be outputted in combination with the stop key (13B) of the above-described embodiment.

1 is a block circuit diagram of a disk reproducing device according to an embodiment of the present invention. 3 is a flowchart for explaining detailed operation of the disc reproducing apparatus shown in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main microcomputer 2 Signal processing circuit 3 Optical pick-up 4 Thread motor 5 Spindle motor 6 RF amplifier 7 Driver 8 Shock proof memory 9 D / A converter 10 Audio | voice amplifier circuit 11 Battery detection circuit 12 Display part 13 Key input part 13B Stop key 13A Playback key 14 Playback mode switch

Claims (2)

In a disc reproducing apparatus for mounting a disc on which an information signal is recorded to a reading device, reading out the information signal and storing it in a memory, and retrieving the stored data from the memory to reproduce the information signal.
When a command to make a stop state is given, a continuous playback mode is provided in which the data already stored in the memory is taken out and the information signal is continuously played back. When given for the first time, a command for taking out the data already stored in the memory, continuing the reproduction output of the information signal to shift the disk to the stop state, and putting it into the stop state is given for the second time. A disc reproducing apparatus configured to stop reproduction output of data already stored in the memory when given. The continuous playback mode is configured to shift to a complete stop state after taking out all data already stored in the memory when an instruction to stop the disk is given. The disk reproducing apparatus according to claim 1.

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