KR19990042619A - Mode switching circuit and method in case of deck failure of VSI - Google Patents

Abstract

The present invention relates to a circuit and a method for automatically switching to a broadcast reception mode when a failure occurs in a deck portion of a VSI. In a conventional VSI system, any one of a head motor, a capstan motor, and a cam motor of a deck portion is used. At the same time, when a malfunction occurs, all operations of VSI were stopped, and there was a problem in that VSI could not be used until A / S was received.

In order to solve the above problems, the present invention initially determines whether cam data is input from the cam terminal of the VSI deck portion, and when it is determined that the cam data is input, the cam data is continuously analyzed to determine whether an abnormality has occurred in the deck portion. If it is determined that the abnormality has occurred in the deck unit in the step, stop the output of the various motor control signals of the deck unit and send a control signal to the ground transistor to drive the ground transistor to the mode when the cam terminal is grounded The microcomputer sequentially performs a step of automatically switching to the broadcast receiving mode and outputting a warning message notifying the deck unit failure through the OS screen when the above step is completed.

Description

Mode switching circuit and method in case of deck failure of VSI

The present invention relates to a circuit and a method for automatically switching to a broadcast reception mode when a failure occurs in a deck portion of a VSI. In particular, cam data indicating various motor states of the VDal deck portion during recording or playback mode is predetermined. After the microcomputer applied from the cam terminal determines whether there is an abnormality in the deck, if there is an error, the grounding transistor is driven to automatically switch to the broadcast reception mode so that the VSI can be used as another function even in the event of the deck failure.

The conventional VSA system basically includes a tuner circuit composed of a frequency tuning circuit, a PLL IC, and a local oscillator and a frequency synthesis circuit so that a user can receive broadcast signals of a desired channel as a recording source. It is provided with a plurality of line input terminals and line output terminals that can be connected to provide a signal that is reproduced from another VSI system as a recording source to record or reproduce and output.

And a traveling system for recording or reproducing video and audio signals provided from signal sources to or from the tape, and a video and audio signal processing for outputting video signals, audio signals, and OSD characters obtained from the traveling system to the TV side. Means and OSD processing means, and key input means for selecting an operation mode of the VSI system as an interface with a user.

In addition, the microcomputer controls the entire operation related to the tape driving during power on / off and recording / playback by the key input signal or the signal sensed by various sensors, and automatically controls the recording by determining the presence / absence of the broadcasting signal on the desired channel. Consists of including.

Looking at the mechanism of the traveling system for explaining the deck portion operation related to the present invention in the conventional VSI system of such a configuration as follows.

First, the tape body is pushed into the tape insert of the cassette to play or record the tape, and the door of the tape insert is opened by pushing towards the set body. Therefore, the V-Seal set bites the tape and guides the inlet guide and the outlet guide to the drum. It is supposed to be loaded.

In the above operation, if the tape body is mounted on the cassette and loaded, and setting the playback mode or the recording mode, the actual driving operation of the tape is performed, and this driving operation is performed by the infrared sensor projecting the signal projected to the end sensor or the start sensor. The tape is moved by the guide roller, the pinch roller, and the capstan shaft by the guide roller, the pinch roller, and the capstan shaft. If the end sensor and the start sensor are detected during the driving operation as described above, the tape is immediately moved. Stop and end playback or recording.

By the way, in the conventional VSI system as described above, if any of the head motor, capstan motor, and cam motor of the deck part occurs, all operations of VSI are stopped at the same time. There was a problem that the sial was not available.

The present invention has been made to solve the above problems, and after the microcomputer which has received the cam data informing the various motor states of the V deck deck portion from the predetermined cam terminal during the recording or playback mode, determines whether there is an abnormality in the deck portion, If there is a problem, the present invention provides a mode switching circuit and method in case of deck failure of VSI, which enables the use of VSI in other functions even when the deck part is broken by automatically switching to a broadcast reception mode by driving a grounding transistor.

In order to achieve the above object, the present invention provides a deck unit for inputting a pulse signal for notifying various motor states such as a head motor, a capstan motor, a cam motor, and the like through a predetermined number of cam terminals to a microcomputer, and each cam of the deck unit. In a VSI system including a micro computer that receives a predetermined input signal from a terminal and controls the various motors, and an OS unit that receives a control signal of the micro computer and outputs a predetermined OS screen. A grounding switching means is provided between the cam terminal and the microcomputer to block data transmission of the cam terminal so that the mode can be switched by being driven by the control signal of the microcomputer.

In addition, the present invention is the step of determining whether the cam data is input from the cam terminal of the V deck deck portion initially, and if it is determined that the cam data has been input in the above step, the cam data is continuously analyzed to determine whether an abnormality has occurred in the deck portion. Determining whether or not an abnormality has occurred in the deck unit, and stopping output of various motor control signals of the deck unit, and subsequently driving a ground transistor by sending a control signal to the ground transistor. And switching the mode to the broadcast reception mode when the grounding transistor is driven and the cam terminal is grounded in the step, and outputting a warning message indicating a deck failure through the OS screen when the step is completed. It is characterized in that the microcomputer performs sequentially.

1 is a circuit block diagram showing a mode switching circuit according to the present invention;

2 is a flowchart illustrating an embodiment according to the present invention.

** Explanation of symbols for the main parts of the drawings **

1: microcomputer 2: deck

3: OSD

Hereinafter, a mode switching circuit and a method of deck failure of VSI in accordance with the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a mode switching device when the deck failure of the Vsial according to the present invention, first, through the four cam terminals A, B, C, D, various motor state of the head motor, capstan motor, cam motor, etc. A deck unit 2 for inputting an informing pulse signal to the microcomputer 1 side, a microcomputer 1 for receiving a predetermined input signal from a cam terminal of the deck unit 2 to control the various motors, In the VSI system including an OSD unit 3 for receiving a control signal of the microcomputer 1 and outputting a predetermined OSD screen, the microcomputer 1 is disposed between the cam terminal A and the microcomputer 1. A grounding switching means is provided which is connected to the control signal of the computer 1 and the data transmission of the cam terminal is interrupted by the grounding switching means, and accordingly, the microcomputer 1 is automatically turned off. By is to be switched to the broadcast reception mode.

In particular, as the grounding leveling means, a transistor TR, a diode, a parametron, a magnetic core, or the like may be used.

Figure 2 is a flow chart illustrating a mode switching method when the deck failure of VSI in accordance with the present invention will be described in more detail in each step as follows.

If any one of various motors such as a head motor, a capstan motor, a cam motor, etc. included in the deck deck unit is not running due to the playback or recording mode using the BC system, the system microcomputer (1 ) Receives the corresponding pulse input through cam terminals A, B, C, and D.

That is, the microcomputer 1 initially determines whether predetermined cam data are input from the cam terminals A, B, C, and D of the VSI deck portion 2.

When it is determined that each cam data is input in the above step, the cam data is continuously analyzed to determine which of the deck motors, such as a head motor, a capstan motor, a cam motor, or the like has occurred.

When the microcomputer 1 determines that an abnormality has occurred in the deck unit 2, the output of various motor control signals to the cam terminals of the deck unit 2 is stopped.

In addition, the control signal is sequentially transmitted to the grounding transistor TR to conduct the grounding transistor TR. At this time, when the grounding transistor TR is driven and the cam terminal A is grounded, the execution mode is automatically broadcast. Switch to the receive mode.

In addition, when the above steps are completed, the microcomputer 1 sends a control signal to the OS unit 3 to output a warning message notifying the user of the deck unit failure on the OS screen of the TV receiver.

Therefore, a message such as "Deck failure! Call A / S agent" is output through the TV receiver screen.

According to the present invention as described above, the cam data informing the various motor status of the V deck deck portion during the recording or playback mode is executed after the microcomputer received from the cam terminals A, B, C, D determines whether the deck portion is abnormal. If there is, the ground transistor can be driven to automatically switch to the broadcast reception mode so that the VSI can be used as another function even in the case of a failure of the deck unit.

Claims (3)

The deck part 2 which inputs the pulse signal which informs the microcomputer 1 of various motor states, such as a head motor, a capstan motor, a cam motor, through the predetermined number of cam terminals, and each cam terminal of the said deck part 2 A microcomputer 1 for receiving a predetermined input signal from the microcomputer 1 to control the various motors, an OSD unit 3 for receiving a control signal of the microcomputer 1 to output a predetermined OSD screen, and the like. In VSI system, Between the cam terminal and the microcomputer (1) is provided with a switching means for grounding to block the data transmission of the cam terminal so that the mode can be switched by being driven by the control signal of the microcomputer (1) Mode switching circuit in case of deck failure of VSI. 2. The mode switching circuit as set forth in claim 1, wherein a transistor (TR) is used as the switching means for grounding. Initially determining whether cam data has been input from each cam terminal of the VSI deck portion 2 (step 10), and if it is determined that cam data has been input at the above step, the cam data is continuously analyzed to determine the deck portion. Determining whether or not an abnormality has occurred (step 11), and if it is determined that the abnormality has occurred in the deck unit 2 in this step, stopping output of various motor control signals of the deck unit 2 (step 12). Subsequently, a control signal is sent to the ground transistor TR to drive the ground transistor TR (step 13), and in this step, when the ground transistor TR is driven and the cam terminal is grounded, the execution mode. The microcomputer 1 automatically switches to the broadcast receiving mode (step 14), and outputs a warning message (step 15) informing the deck unit of failure through the OS screen when the step is completed. Deck failure when the operation mode switching method of sialic V, characterized in that for performing the primary.