KR20000033632A - Method for compensating error of time information of video cassette recorder having auto clock set function - Google Patents

Abstract

PURPOSE: A method for compensating an error of time information in a VCR having an auto clock set(ACS) function is provided. CONSTITUTION: When the ACS function of a VCR is operated, if it is judged that a current video signal is inputted from a line by a microcomputer(S102), an OSD message, "not real broadcasting, ACS auto stop" is displayed on a TV picture receiving unit by controlling an OSD processing unit(S103). When it is judged that the video signal is inputted from a tuner or another external device, not from the line, ACS information values of predetermined channels(A,B,C) are compared with one another(S108), and a current time is reset to identical information of at least two ACS channels(S109). The current time is prevented from being set to wrong time information due to reproduction of external devices such as a VCR. In addition, the user needs not to set time information.

Description

Time information error correction method of BC with automatic time set function

The present invention relates to a time information error correction method in a VCR having an automatic time set function. In particular, when incorrect time information is inputted by playing an external device instead of a live broadcast, the automatic time set (ACS) operation is performed on the OSD screen. Plays an external device such as a VCR by displaying the pause and automatically setting correct automatic time set (ACS) information by comparing and judging whether there is the same time information of two or more of the automatic time set (ACS) information of a plurality of channels. A method for compensating the error of time with an automatic time set function that prevents incorrect time information from being set by the user and does not require the user to worry about setting ACS information separately. information of VCR).

In general, the VCR system is an electronic device having a recording / reproducing function that is commonly used with a TV receiver, and a circuit block diagram of such a VCR system is shown in FIG. 1.

The circuit block diagram includes a tuner 11 for receiving a regular broadcast signal from the antenna 10 and performing channel tuning, and a phase locked loop (PLL) control of the tuning signal provided from the tuner 11. The lock loop circuit 12, the microcomputer 13 for controlling the VCR system, the OSD processing unit 14 for generating the OSD screen, the system memory 15 for storing and storing predetermined information, and recording / reproducing. A deck unit 16 for performing an operation, a timer unit 17 for performing a clock, a channel reservation function, etc., an RF converter 18 for converting a video signal into an RF signal, and a video signal processing for processing a video signal. The circuit 19 includes an external TV receiver 20 and the like.

If you want to make a scheduled recording in the VCR as above, you can open the OS screen by operating the remote control key, and start the start time, end time, and recording speed of one channel and broadcast program that you want to make reservation recording on the OS screen. By setting it, the microcomputer 13 counts the time while the microcomputer 13 stores the reserved channel and the recording start time and end time, and when the time count result reaches the scheduled recording start time, the reserved channel previously stored in the currently set channel is stored. It is configured to record the broadcasting program for the desired time by switching to and end the recording when the end time is reached.

In order to inform the time information of each broadcast program when the program is scheduled to be recorded as described above, broadcasting stations in the United States and the like encode and transmit the time information in the vertical blanking section, and the TV or VCR decodes this signal and sets it automatically. Auto Clock Set (ACS) is applied.

Therefore, when the automatic time set (ACS) function is completed by the microcomputer 13, the current date and time are automatically set.

In more detail, the microcomputer 13 outputs the function menu screen to the OS screen according to the user's selection. At this time, the user can store the necessary channels in the area in the system memory with the remote controller while using the remote control while watching the corresponding screen. You can perform channel presets, time adjustments for time alignment, and scheduled recording with Video Plus.

The reservation recording function is widely used in VPS (Video Program System) and PDC (Program Delivery Control) in Europe, KBPS in Korea and EDS in USA.

In particular, in the United States, the data format to be added to the 21st H-Line of the broadcast video signal is defined by the EIA standard.

That is, the 21st line is not shown on the screen because it belongs to the vertical retrace period, but data such as caption, broadcaster ID, broadcast content / length, and current time are encoded and transmitted in each predetermined format.

However, in the related art, when the current time information is set using the automatic time set (ACS) function, the time of the broadcast program played by an external device such as a VCR is different from the exact time information of the real broadcast provided by the broadcasting station in real time. Due to the setting of information, there was a problem in that the time check was incorrectly recorded during the reservation recording, so that the desired broadcast program could not be recorded.

The present invention is to solve the above problems, and when the wrong time information is input by the external device playback rather than the live broadcast is ignored and the automatic time set (ACS) operation stops on the OSD screen and any number of arbitrary It compares and judges whether there is the same time information of two or more of the automatic time set (ACS) information of the channel, and automatically sets the correct automatic time set (ACS) information so that the wrong time is not the current time by playing the external device such as a VCR. It is an object of the present invention to provide a time information error correction method of a VCR having an automatic time set function that prevents information from being set and automatically sets accurate time information without the user having to worry about setting ACS information separately.

As a technical idea for achieving the object of the present invention, the process of reading the time information currently set in the memory means while the automatic time set (ACS) function is in operation, and whether the current video signal is a video signal input to the line Determining, and if it is determined that the signal is not a line signal, reading the automatic time set (ACS) information of each channel tuned by the tuning means, and determining the automatic time set (ACS) information value of each channel. Comparing and determining whether at least two automatic time set (ACS) information of each channel is the same and resetting the current time to two or more same automatic time set (ACS) information values. The invention is presented.

1 is a block diagram showing a general VCR system,

2 is a block diagram of a VCR system for implementing the present invention;

3 is a flowchart illustrating a time information error correction method according to the present invention.

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

10: antenna 11: tuner

12: phase lock loop circuit 13: microcomputer

14: OSD processing unit 15: system memory

16: deck portion 17: timer portion

18: RF converter 19: Video signal processing circuit

20: TV receiver 21: ACS decoder

Hereinafter, with reference to the accompanying drawings, the configuration and operation of the embodiment for achieving the above object will be described.

2 is a system block diagram showing the main configuration of a VCR having an automatic time set (ACS) function according to the present invention.

That is, the system block diagram illustrates a phase lock loop (PLL) control of a tuner 11 for receiving a regular broadcast signal from the antenna 10 and performing channel tuning, and a tuning signal provided from the tuner 11. A phase lock loop circuit 12, a microcomputer 13 for controlling a VCR system, an OSD processor 14 for generating an OSD screen, a system memory 15 for storing and storing predetermined information, and a recording. Deck unit 16 for performing / playback operation, timer unit 17 for performing clock, channel reservation function, etc., RF converter 18 for converting video signal to RF signal, and video processing video signal. A signal processing circuit 19, an external TV receiver 20, and an ACS decoder 21 that receives and decodes automatic time set (ACS) information provided with a broadcast program from a broadcasting station.

The process of the present invention implemented by the system configured as described above will be described with reference to the flowchart of FIG. 3.

In line 21 of the vertical blanking section of the broadcast program signal transmitted from a broadcasting station, Extended Data Service (EDS) information is included. The EDS information includes program information, program rating, program description, and local time information. Time) will be displayed.

Therefore, whenever the broadcast program signal is received by the tuner 11 of the VCR via an antenna, Extended Data Service (EDS) information is also provided to the VCR. In this case, the VCR transmits time information of the EDS information through the ACS decoder 21. After decoding, an automatic time set is performed.

When the current time information is decoded by the ACS decoder 21, the microcomputer 13 determines whether the current automatic time set (ACS) function is in operation. It reads from (15) (S100, S101).

For reference, when the ACS information is decoded through the ACS decoder 21 as described above and recorded on the control track of the video tape to be recorded, the signal is divided into general control signals as follows.

That is, when recording ACS information in the control track of a video tape when recording a broadcast program, the signals are distinguished from each other by using 3: 7 instead of 6: 4, which is the pulse width ratio of the general control signal.

When the above process is completed, the microcomputer 13 again determines whether the current video signal is input from the line. If it is determined that the video signal is input from the line, the microcomputer 13 sends a control signal to the OSD processor 14. The "not broadcast. Automatic time set (ACS) operation stop" message is displayed on the TV receiver 20 (S102, S103).

On the other hand, if it is determined that the video signal is input from the tuner 11 or an external device rather than from the line, the microcomputer 13 first reads the automatic time set (ACS) information of any channel A and then sequentially The automatic time set (ACS) information of channels B and C is read (S104, S105, S106).

When the above process is completed, the microcomputer 13 again compares the automatic time set (ACS) information of channels A, B, and C to determine whether the current time information is the same (S107).

Upon completion of the determination process, the microcomputer 13 determines whether at least two pieces of automatic time set (ACS) information of channels A, B, and C are the same. The current time is reset to the same automatic time set (ACS) information value, and thus the reset automatic time set (ACS) information value is recorded and stored in the system memory 15 (S108 and S109).

However, at this time, if two or more automatic time set (ACS) information of channels A, B, and C are not the same and each time information is wrong, the microcomputer 13 cannot determine which time information is correct. The control unit 14 transmits a control signal to display the TV receiver 20 with the message, "not broadcast. Automatic time set (ACS) stopped."

As can be seen from the above description, when the microcomputer 13 determines that the current video signal is input from the line while the automatic time set (ACS) function of the VCR is activated, the present invention turns the OSD processor 14 on. Control to display the "not live broadcast. Auto Stop Time Set (ACS)" OSD message on TV receiver 20 and determine if video signal is input from tuner 11 or other external device, not from line If the automatic time set (ACS) information of any channel A, B, C is compared and judged, the VCR is reset by resetting the current time to the same information of at least two of the automatic time set (ACS) information of channels A, B, and C. It is possible to prevent incorrect time information from being set by the playback of an external device.

In addition, there is an effect that the user can automatically set the correct time information conveniently without having to worry about the time information setting separately.

Claims (2)

In a VCR with an automatic time set (ACS) function, (a) reading the time information currently set in the memory means while the automatic time set (ACS) function is in operation; (b) determining whether the current video signal is a video signal input through a line; (c) in the step (b), if it is determined that the signal is not a line signal, reading a predetermined number of channel automatic time set (ACS) information tuned by the tuning means; (d) comparing and determining an automatic time set (ACS) information value of each channel; (e) resetting the current time to two or more automatic time set (ACS) information values by checking whether at least two automatic time set (ACS) information of each channel is the same. Time information error correction method of a VCR having an automatic time set (ACS) function, characterized in that. The method of claim 1, further comprising the step of outputting an automatic time set (ACS) function stop message to the OSD screen together with a message that it is not a real broadcast, if it is determined that the input signal is a line input signal. A time information error correction method of a VCR having an automatic time set (ACS) function.