KR100198977B1 - Auto controlling device and method of noise reduction level for tape reproducing in tvcr - Google Patents

Abstract

The present invention relates to a noise reduction apparatus for playing a tape of a TVCR, and more particularly, to calculate a viewing distance by recognizing a distance between a viewer and a TVCR, and to reduce a level of a high frequency component included in a luminance signal (Y) according to the viewing distance. Automatically controlling noise reduction level during TVCR tape playback.

The present invention uses the remote control key recognition means for recognizing the key operation of the remote control, the viewing distance determination means for determining the viewing distance and the information provided by the remote control key recognition means and the viewing distance determination means at the time of playing the tape of the TVCR. And a control means for automatically adjusting the noise reduction level, and a noise reduction means for reducing high frequency noise components in the luminance signal Y by using the control signal of the control means. Determining, by the control means, a noise reduction level control key input to a viewing distance; determining a current noise reduction mode; and outputting a corresponding noise reduction level value according to the noise reduction mode determination result. Automatically adjusts the noise reduction level to correlate to viewing distance during TVCR tape playback This will always be one to provide the best picture quality.

Description

Automatic Control and Method of Noise Reduction Level in Tape Playback of TVCR

The present invention relates to a noise reduction apparatus and method for reproducing a tape of a TVCR, and more particularly, to recognizing a distance between a viewer and a TVCR, and to automatically adjusting a noise reduction level for reproducing a tape according to a viewing distance. A level automatic control device and method.

In general, in a TVCR in which a TV and a VCR are integrated, a tape is reproduced by a signal read from a head of a video deck and processed in a video block, and a composite video signal is supplied to the main signal processing unit, and the main signal processing unit supplies Processing to output the color signals R, G, and B to the CRT.

When the TVCR tape is played back, the luminance signal Y contains high frequency noise. When the noise is high, the image quality is degraded and the screen is rough to the viewer.

In order to solve this problem, a TVCR is provided with a noise reduction device for tape playback. The noise reduction device of the conventional TVCR tape playback shown in FIG. 1 connects the capacitor C and the transistor Q to the luminance signal line output from the Y / C processing unit of the video block and reduces the on / off of the transistor Q. Controlled by a switch, high is applied to the base of the transistor Q so that a certain amount of high frequency components included in the luminance signal Y is applied to the capacitor C and the emitter of the transistor Q while the transistor Q is turned on. It flows through the ground to reduce noise. In the tape reduction of such a TVCR, the noise reduction device is always fixed at a constant noise reduction level.

However, depending on the distance between the viewer and the TVCR, there is a significant difference in the viewer's feeling of the same amount of noise. In other words, if the viewing distance is normal, the screen feels rough even with little noise, and if the viewing distance is far, the image feels good with relatively much noise, so it is necessary to adjust the noise reduction level according to the viewing distance. However, the conventional noise reduction device that always reduces a certain amount of high frequency components while the noise reduction switch is pressed has a disadvantage in that the noise reduction level cannot be adjusted according to the viewing distance.

The present invention is to solve the above problems, the TVCR for recognizing the distance between the viewer and the TVCR to calculate the viewing distance and automatically adjusts the reduction level of the high frequency component included in the luminance signal (Y) according to the viewing distance It is an object of the present invention to provide an apparatus and a method for automatically adjusting the noise reduction level during tape playback.

To this end, the present invention provides a tape of a TVCR by using remote control key recognition means for recognizing key operation of a remote control, viewing distance determination means for determining a viewing distance, and information provided by the remote control key recognition means and viewing distance determination means. Control means for automatically adjusting the noise level during reproduction, and noise reduction means for reducing the high frequency noise component of the luminance signal (Y) by using the control signal of the control means.

In addition, the method for automatically adjusting the noise reduction level when playing back the tape of the TVCR according to the present invention may include determining a noise reduction level control key input relative to a viewing distance, determining a current noise reduction mode, and according to the noise mode determination result. And outputting a noise reduction level value.

1 is a schematic diagram of a noise reduction apparatus for tape playback of a conventional TVCR.

Figure 2 is a block diagram of a noise reduction level automatic adjustment device during tape playback of a TVCR according to the present invention

3 is a flowchart of a method for automatically adjusting a noise reduction level during tape playback of a TVCR according to the present invention.

Explanation of symbols on the main parts of the drawings

10: preamplifier 20: key determination unit

30: viewing distance discrimination unit 31: distance recognition sensor

32: viewing distance discriminator 33: A / D converter

40: microprocessor 50: RAM

60: mode memory section 70: noise reduction section

71: D / A controller 80: tuner

90: main signal processing unit 100: Y / C processing unit

110: Y / C mixer unit 120: band pass filter

130: Emphasis section 140: Head

C1 to Cn: capacitors Q1 to Qn: transistors

2 is a block diagram of an automatic noise level adjusting device for playing back a tape of a TVCR according to an exemplary embodiment of the present invention.

That is, the composite video signal is processed by the tuner 80 receiving the broadcast signal, the signal supplied from the tuner 80 and the Y / C mixer 110, and the composite video signal is transmitted to the Y / C signal processor 100. Luminance signal (Y) in the main signal processing unit 90 for outputting the color signal (R, G, B) to the signal and the signal input from the main signal processing unit (90) or the head (140) during recording / playback of the TVCR. And the Y / C processing unit 100 for separating the chromaticity signal C and the bandpass filter 120 for passing the signal of a specific band in the luminance signal Y of the Y / C processing unit 100 to obtain a required frequency component. ), An emphasis unit 130 for preemphasis / de-emphasis the signals during recording / reproduction of the TVCR, a signal input from the emphasis unit 130, and Y / C. Y / C mixer 110 for supplying the composite video signal to the main signal processing unit 90, a preamplifier 10 for amplifying the received weak remote control signal, and the preamplifier 11 A TVCR comprising a key determination unit 20 for determining a corresponding remote control key of an input signal and a microprocessor 40 for overall control of a TVCR, comprising: a distance recognition sensor for recognizing a distance between a viewer and a TVCR; 31, the viewing distance discriminator 32 for discriminating the viewing distance from the output signal of the distance recognition sensor 31, and the analog output signal of the viewing distance discriminator 32 is converted into a digital signal and the microprocessor 40 A viewing distance determination unit 30 comprising an A / D converter 33 provided at the; A RAM 50 in which information on a noise reduction level relative to a viewing distance is stored; A mode memory 60 for storing noise reduction mode information; The D / A controller 71 converts the digital information on the noise reduction level input from the microprocessor 40 into analog and outputs the analog information, and the Y / C is turned on and off by the output of the D / A controller 71. A noise reduction unit including a plurality of transistors Q1 to Qn and capacitors C1 to Cn for flowing high frequency noise components of the luminance signal Y supplied to the band pass filter 120 from the processor 100 through the ground. 70).

In addition, the microprocessor 40 recognizes a noise reduction key compared to the viewing distance input from the remote controller, changes the current noise reduction mode, and stores the current noise reduction mode in the mode memory 60, and stores the corresponding noise reduction level value in the noise reduction unit 70. It also includes a function to output to).

The operation of the present invention having such a configuration will be described with reference to FIG.

When the viewer first selects the VCR key provided on the front panel of the remote control or the TVCR, and then presses the play key, the microprocessor 40 recognizes this and controls the TVCR to play the video tape.

Thus, the tape of the video deck starts to run and the information recorded on the tape is read by the head 140 and supplied to the main signal processing unit 90 via the emphasis unit 130 and the Y / C combining unit, and the main signal processing unit ( 90 processes this to output a color signal (R, G, B) to a CRT (not shown) to reproduce an image.

At this time, the main signal processor 90 outputs the composite video signal CV to the Y / C processor 100. The Y / C processor 100 outputs the luminance signal Y and the chroma signal from the composite video signal CV. (C) is separated and output, and the output luminance signal Y is used for adjustment of sharpness and the like, and the chromaticity signal C is used for color and tint adjustment and the like.

At the same time, filtering is performed through the noise reduction unit 70 to reduce the high frequency noise component included in the luminance signal Y.

The filtering performed by the noise reduction unit 70 depends on the noise reduction mode.

If the noise reduction mode is not specified (normal mode), the specified noise reduction level value (digital signal) is output to the noise reduction unit 70, and the noise reduction unit 70 converts it to an analog signal and corresponds to the value. Control the output of the port to high or low.

As a result, the transistor in which the high is applied to the base among the transistors Q1 to Qn of the noise reduction unit 70 is turned on, and a high frequency component corresponding to the capacitor capacity connected to the collector of the transistor flows to the ground at all times. Only a certain amount of high frequency noise components are filtered out.

On the other hand, if the current noise reduction mode stored in the mode memory 60 is a noise reduction mode compared to the viewing distance, the microprocessor 40 uses the information on the viewing distance input from the viewing distance determination unit 30.

The viewing distance determining unit 30 applies a signal for the distance between the viewer and the TVCR to the viewing distance determiner 32 when the distance recognition sensor 31 determines the application distance and outputs the distance. (Analog signal) and the A / D converter converts it to a digital signal for the microprocessor 40 to recognize and outputs it.

The microprocessor 40 reads the noise reduction level corresponding to the viewing distance input from the viewing distance determination unit 30 from the RAM 50 and outputs it to the D / A controller 71 of the noise reduction unit 70. The D / A controller 71 converts this into an analog signal and outputs it.

As a result, only the port output of the D / A controller 71 among the transistors Q1 to Qn is turned on to filter the high frequency noise component. At this time, the amount of the filtered high frequency component is a capacitor connected to the collector of the transistor to be turned on. It depends on the capacitance and the total noise reduction is equal to the sum of the capacitors filtering.

Hereinafter, a method for automatically adjusting the noise reduction level during TVCR tape playback by the microprocessor 40 will be described with reference to the flowchart of FIG. 3.

When the TVCR plays back the tape, the microprocessor 40 periodically determines whether a noise reduction key for viewing distance is input by a remote controller (not shown) for the purpose of noise reduction; Changing and storing a current noise reduction mode when a noise reduction key is input to a viewing distance as a result of the determination; Reading a current noise reduction mode; Determining a current noise reduction mode; According to the determination result, a process of outputting a corresponding noise reduction level value is performed.

In detail, when the TVCR plays back the tape, the microprocessor 40 determines whether a noise reduction key versus a viewing distance is input from the remote control to reduce the high frequency noise component of the luminance signal Y while controlling the TVCR as a whole. S1).

As a result of the determination, if the noise reduction key is compared to the viewing distance, the current noise reduction mode stored in the mode memory 60 is changed and stored (S2).

That is, since the noise reduction key for the viewing distance of the remote controller is toggled, the noise reduction mode for the viewing distance is selected / deselected each time the viewer presses the key.

On the other hand, if the noise reduction key for the viewing distance is not input from the remote controller or after performing the process (S2), the current memory reduction mode is read from the mode memory 60 (S3). It is determined whether the current noise reduction mode is the noise reduction mode compared to the viewing distance (S4).

In the normal noise reduction mode, the predetermined noise reduction level is output to the D / A controller 71 of the noise reduction unit 70 to control the transistors Q1 to Qn and the capacitors C1 to Cn. The high frequency component of the luminance signal Y input to the pass filter 120 is reduced by a predetermined amount (S8).

On the other hand, if the determination result of the process (S4) in the noise reduction mode compared to the viewing distance reads the viewing distance information input from the viewing distance determination unit 30, the value of the noise reduction level corresponding to the distance between the current viewer and the TVCR RAM ( Read from 50). At this time, the RAM 50 stores information about a viewing distance vs. a noise reduction level that has been experimentally obtained. The microprocessor 40 controls the transistors Q1 to Qn and the capacitors C1 to Cn by outputting the noise reduction level value read from the RAM 50 to the D / A controller 71 of the noise reduction unit 70. The high frequency component of the luminance signal Y input to the band pass filter 120 is reduced (S5 to S7).

Only a signal of a specific frequency band among the luminance signals Y having reduced noise components passes through the band pass filter 120 and is then emphasized (pre-emphasis) by the emphasizing unit 130 to be Y / C mixer unit 110. The Y / C mixer 110 supplies the composite video signal to the main signal processor 90 to reduce noise to an appropriate level according to the viewing distance, so that the viewer can always feel the best picture quality.

As described above, the present invention provides a microprocessor by determining a distance between a viewer and a TVCR by providing a noise reduction key on a remote control so that the microprocessor can recognize the remote control and having a viewing distance recognition means. The processor automatically controls the noise reduction level according to the noise reduction mode and viewing distance so that the best picture quality is always provided regardless of the viewing distance.

The present invention has been described only with respect to one embodiment of the apparatus and method for automatically adjusting the noise reduction level during tape playback of a TVCR as described in the claims. However, the present invention is not limited thereto. .

Claims (5)

A tuner 80 receiving a broadcast signal, and a signal supplied from the tuner 80 and the Y / C mixer 110, process the composite video signal to the Y / C signal processor 100, and CRT (not shown). Luminance signal (Y) and chromaticity in the signal input from the main signal processing unit (90) for outputting the color signal (R, G, B) to the signal from the main signal processing unit (90) or the head (140) during the recording / playback of the TVCR. A Y / C processing unit 100 for separating the signal C, a band pass filter 120 for passing only a signal of a specific band in the luminance signal Y of the Y / C processing unit 100, and obtaining a required frequency component; And a composite image by synthesizing a signal and Y / C input from the emphasis unit 130 to preemphasis / deemphasis the signal during recording / reproduction of the TVCR, and the emphasis unit 130. From the Y / C mixer 110 for supplying the signal to the main signal processor 90, the preamplifier 10 for amplifying the received weak remote control signal, and the preamplifier 11 from the preamplifier 11. A TVCR comprising a key determination unit 20 for determining a corresponding remote control key of an output signal and a microprocessor 40 for controlling the TVCR as a whole, wherein the viewing distance determination unit determines a distance between a viewer and a TVCR. 30, a RAM 50 storing information on a noise reduction level relative to a viewing distance, a mode memory 60 storing noise reduction mode information, and a luminance signal under control of the microprocessor 40. A noise reduction level automatic adjustment device for tape playback of a TVCR, comprising a noise reduction unit (70) for reducing high frequency noise components in Y). The viewing distance determination unit of claim 1, wherein the viewing distance determination unit 30 determines a viewing distance from a distance recognition sensor 31 that recognizes a distance between a viewer and a TVCR, and an output signal of the distance recognition sensor 31. Noise during TVCR playback, characterized in that it comprises an A / D converter 33 which converts the analog output signal of the viewing distance discriminator 32 into a digital signal and provides it to the microprocessor 40. Reduction level automatic control. The D / A controller 71 of claim 1, wherein the noise reduction unit 70 converts the digital information of the noise reduction level input from the microprocessor 40 into analog and outputs the analog information. A plurality of transistors Q1 to Qn and capacitors (ON / Qn) which are turned on / off by the output of the signal to reduce the high frequency noise component of the luminance signal Y supplied from the Y / C signal processor 100 to the bandpass filter 120. C1 to Cn), wherein the noise reduction level automatic adjustment device for TVCR tape playback. Determining whether a noise reduction key for a viewing distance of the remote controller is input; Changing and storing a current noise reduction mode when a noise reduction key is input to a viewing distance as a result of the determination; Reading a current noise reduction mode; Determining a current noise reduction mode and outputting a corresponding noise reduction level value according to the result. The method of claim 4, wherein the outputting of the corresponding noise reduction level value according to the determination result of the noise reduction mode comprises: outputting a predetermined noise reduction level value to the noise reduction unit 70 when the noise reduction mode is a normal mode. When the noise reduction mode is the noise reduction mode compared to the viewing distance, the viewing distance determination unit 30 reads the viewing distance information and then reads the noise reduction level value corresponding to the viewing distance from the RAM 50 to the noise reduction unit 70. A method for automatically adjusting the noise reduction level during tape playback of a TVCR, characterized in that the step of outputting.