KR19990026341A - How to control recording speed of VSI when receiving weak signal - Google Patents

Abstract

The present invention relates to a method of controlling a recording speed when a broadcast signal is a weak signal. Conventionally, when a broadcast signal received by a tuner of VSI is a weak signal, the recording speed is set to be three times higher than that of a recording mode. When the output of the recorded screen is unstable and straight due to the output of the user is watching the TV when the discomfort is encouraged, on the other hand there is a problem that caused the unnecessary tape wasted because the bad screen is recorded on the tape.

The present invention is to determine whether or not the cassette is loaded into the deck portion 22 in order to improve such a conventional problem (step 30), and if it is determined that the cassette is loaded into the deck portion 22 in the step Determining whether the current processing mode is the recording mode (step 31); and if determining that the current processing mode is the recording mode, determining whether the current recording mode is running (step 32); and the above steps If it is determined that the recording mode is in progress, the AGC level of the tuner is input from the tuner's AGC terminal to determine whether the AGC level is equal to or greater than a predetermined level (step 33), and as a result of the determination, the AGC level input is equal to or greater than a predetermined value. If it is determined that the current recording speed is at least three times the speed (step 34), and if the current recording speed is determined to be at least three times the speed in the above step the control signal to the servo circuit unit Changing the recording speed to standard speed (single speed) (step 35), and continuing recording when the above step is completed (step 36), and finally, when the recording end time is reached. The microcomputer 21 sequentially processes the step (step 37) of sending a control signal to the deck unit 22 and ending the recording.

Description

How to control recording speed of VSI when receiving weak signal

The present invention relates to a method of controlling a recording speed when a broadcast signal is a weak signal. In particular, when the signal received by the receiver of a VSI system is a weak signal, the recording speed is automatically set when the recording speed is set to 3x in the recording mode. By changing the speed to standard speed, you can record better images when recording tapes.

A general VSI system is an electronic device having a recording / playback function that is widely used with a TV receiver, and a conventional circuit having an OSD function in such a VSI system is shown in a block diagram as shown in FIG. 1.

Here, a tuner 34 for receiving a regular broadcast signal from an antenna 33 of a VSI system and performing channel tuning, and a phase for controlling a phase locked loop (PLL) of the tuning signal provided from the tuner 34. The lock loop circuit 35, the microcomputer 32 for controlling the VSI system, the OSD processing unit 41 for generating the OSD screen, and the like are included.

In particular, the tuner has an AGC (Auto Gain Control) terminal to control the voltage gain of the received broadcast signal at a constant level.

In addition, the VSI system includes a system memory 42, a deck unit 36 for performing a recording / reproducing deck operation, a servo circuit unit 37 for controlling a drive motor and the like on the deck unit 25 side, and a clock. , A timer unit 31 for performing a channel reservation function, an RF converter 38, a video / audio signal processing circuit unit 39 for performing video / audio signal processing, an external TV receiver 40, and the like. It is done.

In the related art, when the broadcast mode received by the tuner 34 is a weak signal, when the recording mode is executed at a speed of three times or more, the recording mode becomes unstable and perpendicular to the output of the recorded screen. When a user watches TV, the user is encouraged, and on the other hand, a bad screen is recorded on the tape, causing unnecessary tape waste.

It is an object of the present invention to automatically improve the recording speed to the standard speed if the recording speed is set to 3x in the recording mode when the signal received from the receiver of the VSI system is a weak signal so as to improve the conventional problems as described above. The present invention provides a method of controlling the recording speed of VSI when receiving a weak signal so that a better screen can be recorded when recording a recording tape, and a bad screen can be recorded on the tape to prevent wasting tape. .

The present invention provides a method for recording a weak signal received by VSI in order to realize the object of the above example, the method comprising: initially determining whether a cassette is loaded in a deck portion; Determining whether the processing mode is the recording mode; and if the current processing mode is determined to be the recording mode, determining whether the current recording mode is running; and if the recording mode is determined to be running in the above step, the tuner Determining whether the AGC level is higher than or equal to a predetermined value by receiving the AGC level of the received signal from the AGC terminal of < RTI ID = 0.0 > < / RTI > And determining that the current recording speed is 3x or higher, and sending a control signal to the servo circuit unit. Changing the video speed to standard speed (1x speed), continuing recording when the above steps are completed, and finally sending a control signal to the deck for recording when the end of recording is reached. The terminating step is characterized in that the microcomputer sequentially processes.

Hereinafter, more specific features of the present invention will be understood by describing the same in detail with the accompanying drawings.

1 is a circuit block diagram of a typical VCR (Video Cassette Recorder) system;

2 is a system circuit block diagram of the present invention;

3 is a flowchart illustrating a method of controlling a recording speed of a VSI when receiving a weak signal according to the present invention.

* Explanation of symbols on the main parts of the drawings

20: Tuner 21: Microprocessor

22: deck portion 23: servo circuit portion

Figure 2 shows a system circuit block for implementing a method for controlling the recording speed of VSI when receiving a weak signal according to the present invention.

In this case, the AGC level is transmitted from the AGC terminal of the tuner 20 when the recording mode is transmitted by sending a control signal to the automatic tuning tuner 20 which receives the broadcast signal from the antenna under the control of the microcomputer and the deck unit 22 of VSI. To determine whether the current AGC level is above a certain level, and if it is not satisfied, it is again determined whether the current recording speed is 3 times or more, and when it is 3 times or more, the microcontroller controls the servo circuit to change the speed to standard speed. The configuration includes a computer 21 and the like.

On the other hand, Figure 3 is a flow chart illustrating the present invention will be described with reference to Figure 3 as follows.

That is, in the state where the synchronization signal is detected by the BC tuner 20, the microcomputer 21 judges whether or not the cassette is initially inserted into the deck portion 22 of the BCial.

At this time, if it is determined that the cassette is inserted into the deck unit 22 in the above step, the microcomputer 21 continuously determines whether the current processing mode is the recording mode.

As a result of the above determination, if it is determined that the current processing mode is the recording mode, the microcomputer 21 determines whether the current recording mode is running. At this time, if it is determined that the recording mode is running, it is received from the AGC terminal of the tuner 20. The AGC level of the signal is input to determine whether the AGC level is above a predetermined value.

In addition, when the microcomputer 21 determines that the input AGC level is a predetermined value or more, the microcomputer 21 continuously determines whether the current recording speed is three times or more.

At this time, if it is determined that the current recording speed is at least 3 times the speed, the control signal is sent to the servo circuit unit 23 to change the recording speed to the standard speed (1 times speed).

In addition, the microcomputer 21 continues recording when the above step is completed. When the recording ends, the microcomputer 21 sends a control signal to the deck unit 22 to terminate the recording.

In the present invention, when the signal received from the receiver of the VSI system is a weak signal, if the recording speed is set to 3 times the speed in the recording mode, the recording speed is automatically changed to the standard speed, so that a better screen can be obtained during the recording of the recording tape. Recording becomes possible and a bad picture is recorded on the tape, which prevents the tape from being wasted.

Claims (1)

In the weak signal recording method of VSI, initially determining whether or not a cassette is loaded in the deck unit 22 (step 30), and if it is determined that the cassette is loaded in the deck unit 22 in the above step, present processing Determining whether the mode is the recording mode (step 31); if the current processing mode is determined to be the recording mode, determining whether the current recording mode is running (step 32); and recording in the above step. If it is determined that the mode is being executed, the AGC terminal of the tuner receives the AGC level of the received signal to determine whether the AGC level is higher than or equal to a certain level (step 33). If it is determined that the current recording speed is three times or more (step 34), and if it is determined that the current recording speed is three times or more in this step, the control signal is sent to the servo circuit to record the recording speed. Is changed to the standard speed (single speed) (step 35), the step of continuing recording when the above step is completed (step 36), and finally, when the recording end time is reached, the deck unit ( 22. The method for controlling the recording speed of the VSI when receiving the weak signal, characterized in that the microcomputer 21 sequentially processes the step (step 37) of sending a control signal to end the recording.