KR0164709B1 - Method of automatic control for speed of vcr's tape - Google Patents

Abstract

The present invention relates to a method for automatically adjusting the tape speed of a novel video cassette recorder that can improve the performance of a video cassette recorder.

A method of automatically adjusting a tape speed of a video cassette recorder, comprising: a first step of selecting a tape recording time after powering on an on-screen display; A second step of selecting a viewable time; A third step of calculating a double speed determination reference value in response to selection signals corresponding to the selected tape recording time and viewable time; And a fourth step of generating a double speed determination signal by comparing the calculated double speed determination reference value with a predetermined threshold value.

Description

How to automatically adjust the tape speed of a video cassette recorder

1 is a schematic block diagram of a video cassette recorder according to the present invention;

2 is a series of flow charts performed in the controller shown in FIG.

3 (a) and (b) are exemplary diagrams for making double speed determinations in accordance with the present invention.

* Explanation of symbols for main parts of the drawings

10: key selector 20: controller

30: display part 40: tech part

50: phase and frequency detector

TECHNICAL FIELD The present invention relates to a video cassette recorder (VCR), and more particularly, to a method for adjusting a speed of a video cassette recorder which automatically adjusts a tape speed of a video cassette recorder using a novel double speed determination technique. .

As is well known in the art, video cassette recorders are widely used for general home or commercial purposes as picture display devices. Conventional video cassette recorders have the function of automatically adjusting the speed of the tape. In adjusting the speed of the tape, in particular, the speeding process is performed to display an image recorded on the tape within a desired time. There are 1x, 3x, and 5x speeds. However, the tape speed control technique of the conventional video cassette recorder is that all the video signals recorded on the tape accurately within the desired time at 1x, 3x, 5x, etc. regardless of the total time of the video signals recorded on the tape. Could not be displayed.

Accordingly, an object of the present invention is to provide a method capable of improving the performance of a video cassette by automatically adjusting the speed of the video cassette tape by using a novel double speed determination method.

The above object of the present invention is a method of automatically adjusting the tape speed of a video cassette recorder, comprising: a first step of selecting a tape recording time after powering on an on-screen display; A second step of selecting a viewable time; A third step of calculating a double speed determination reference value in response to selection signals corresponding to the selected tape recording time and viewable time; By comparing the calculated double speed determination reference value with a predetermined threshold value, it can be achieved by providing a tape speed adjusting method of a video cassette recorder having a fourth step of generating a double speed determination signal.

Hereinafter, embodiments according to the present invention will be described in detail. Referring to FIG. 1, a schematic block diagram of a video cassette recorder illustrating a tape speed adjustment method of a video cassette recorder according to the present invention is illustrated. As shown in FIG. 1, the video cassette recorder includes a key selection section 10, a controller 20, a display section 30, a deck section 40, and a phase and frequency detector 50. As shown in FIG.

The key selection unit 10 including various functions, for example, a first menu key for the tape recording selection time and a second menu key for the viewing time selection, may be applied to the first and second menu keys selected by the user. Corresponding first and second selection signals are generated and provided to the controller 20. Those skilled in the art will appreciate that the key selection section includes various keys in addition to the first and second menu keys. Then, the controller 20 controls the overall operation of the video cassette recorder 100, in particular, in response to the first and second selection signals from the key selection section 10, the first and second. And third and fourth control signals. That is, in order to generate the control signals, in response to the first selection signal, the controller 20 selects and sets the tape recording time by providing the first control signal to the display unit 30.

In detail, the predetermined tape recording time is set on the first menu displayed on the display unit 30. After setting the tape recording time, the controller 20 sets the viewable time from the second menu displayed on the display unit 30 by providing the second control signal to the display unit 30 in response to the second selection signal. .

Through such a process, the controller 20 calculates the double speed determination reference value, and transmits the fourth control signal to the drum motor of the deck unit 40 using the determined double speed determination reference value and the descent from the phase and frequency detector 50. 42) and capstan motor 44, respectively.

As is well known in the art, the deck portion 40 is a device consisting of a mechanical mechanism for driving the tape at a normal speed, and also having various devices, for the sake of simplicity of description herein. Only the drum motor 42 and the capstan motor 44 are schematically illustrated. While the drum motor 42 is driven for stable rotation of the tape in response to the third control signal from the controller 20, the capstan motor 44 responds to this fourth control signal from the controller 20. Therefore, as a motor driven to maintain tracking of the video track at all times, in particular, the image quality of the video cassette recorder can be improved through the correct operation of the capster motor 44.

The phase and frequency detector 50 detects the phase and frequency generated by the capstan motor 44 and generates a signal corresponding to the detected phase and frequency to the controller 20. By detecting this phase and frequency, the controller 20 provides the drum motor 42 and the capstan motor 44 with the third and fourth control signals corresponding to the desired phase and frequency signals in order to obtain the required double speed. do.

2 and 3 are flow charts and diagrams illustrating for automatically adjusting the tape speed of the video cassette recorder according to the present invention. A series of operations of the flow chart shown in FIG. 2 is performed in the controller 20 shown in FIG.

In FIG. 2, in response to the first selection signal from the key selection section 10, the controller 20 turns on the on-screen display OSD by providing the first control signal to the display section 30 ( In step 21) and step 22, if the tape recording time illustrated in the menu 1, for example, third (a), displayed on the display unit 30 is, for example, 120 minutes, the user presses the No. 2 key. Press.

Then, the first selection signal corresponding to the second key is provided to the controller 20, and the controller 20 generates the first control signal in response to the first selection signal and provides it to the display unit 30. The first selection signal corresponding to the second key is, of course, stored in a memory (not shown) of the controller 20. Then, in step 23, the controller 20 is set to 30 minutes, i.e., by the menu for selecting the viewable time shown in the second menu from the key selection section 10, for example, the third (b). The second control signal in response to the second selection signal corresponding to the fifth key is provided to the display unit 30 for display and also stored in the memory.

Through the steps 22 and 23, when the tape recording time and the viewable time are set, and the first and second control signals corresponding to the tape recording time and the viewable time are stored, the speed of the controller 20 of the controller 20 determines the speed. The reference value Y is calculated (step 24). In a preferred embodiment of the present invention, the double speed determination reference value Y can be calculated as follows.

Where ST represents the viewable time and RT represents the time recorded on the tape.

As can be seen from the above equation, for example, when the second control signal, i.e., the viewable time ST is 30 minutes, and the first control signal, i.e., the tape recording time RT is 120 minutes, the controller (20) generates 4 as the double speed determination reference value (Y). The controller 20 then passes through a decision speed reference value, e.g., 4, through the determination steps 25, 26 and 27, as shown in FIG. Decide

After determining the speed at step 28, 29, 31, or 32, the controller 20 outputs the third and fourth control signals corresponding to the determined speed and detected signals from the phase and frequency detector 50 to the drum motor 42. And the capstan motor 44, the video signal recorded on the tape of the video cassette record can be efficiently viewed for a predetermined time.

As described above, according to the present invention, when the user selects the tape recording time and the viewable time according to the novel speed determining method, the user determines the video cassette recorder more conveniently by calculating the speed determining reference value and automatically determining the speed. I can watch it easily.

Claims (2)

A method of automatically adjusting a tape speed of a video cassette recorder, comprising: a first step of selecting a tape recording time after powering on an on-screen display; A second step of selecting a viewable time; A third step of calculating a double speed determination reference value in response to selection signals corresponding to the selected tape recording time and viewable time; And a fourth step of generating a double speed determination signal by comparing the calculated double speed determination reference value with a predetermined threshold value. The method of claim 1, wherein the fourth step comprises: generating a single speed determination signal when the double speed determination reference value is less than or equal to one; Generating a third double speed determination signal if the double speed determination reference value is greater than 1 or less than or equal to 3; Generating a fifth double speed determination signal if the double speed determination reference value is greater than 3 or less than or equal to five; And a step of generating a seventh double speed determination signal when the double speed determination reference value is larger than five.