KR100221839B1 - Vcr with viss-recording using contrast level - Google Patents

Abstract

The present invention relates to a video cassette recorder configured to realize a VHS (VHS Index Search System) function by adjusting a brightness level of a video to be recorded. The video signal input terminal for receiving a video signal, and the video signal input terminal A recording signal processor which separately modulates a luminance signal in a first frequency region and a hue signal in a second frequency region with respect to an image signal applied through the video signal, and a white screen having a luminance level greater than or equal to a predetermined value according to a predetermined control command. An OSD generator for outputting an OSD pattern signal, a mixer for mixing and outputting an output signal of the recording signal processor and an output signal of the OSD generator, and recording a video signal for recording a mixed video signal according to a predetermined control signal A video reproducing section for reading out a video signal recorded on a tape according to a predetermined control signal, and demodulating the signal read out by the video reproducing section. A playback image processing unit, a brightness level detection unit for detecting a brightness level of the signal output from the playback image processing unit, and the OSD generation unit at the time of recording to control the video signal having a predetermined brightness level at either the beginning or the end of the recording section. And a control unit for controlling recording and reproducing of a corresponding portion through the luminance level detecting unit during reproduction.

Description

Video cassette recorder with bis signal recording function using luminance level

The present invention relates to a video cassette recorder, and more particularly, to a video cassette recorder configured to realize a VHS Index Search System (VISS) function by adjusting a luminance level of a recorded video.

A video cassette recorder (hereinafter referred to as a VCR) records video and audio information by magnetizing a thin film uniformly coated with a magnetic material with a contracted electromagnetic signal corresponding to predetermined data or reads in the reverse order. Recently, by operating the duty ratio of the control signal (CTL) to be recorded together with the video and audio signals, the playback position of the tape, etc. are recorded and referred to during recording or playback. VHS Index Search System) VCR has been developed and commercialized.

Fig. 1 is a block diagram showing the internal structure of a VCR that realizes a service function using a conventional CTL signal. In Fig. 1, reference numeral 1 is a remote control device for remotely controlling a recording and playback function, and 2 is a remote control device ( Receiving unit for receiving the infrared signal transmitted from the 1) and converts it into an electrical code signal, 33 controls the overall device and service for the date on the predetermined part of the tape according to the user's function key selection A microprocessor as a control unit that executes a function of recording or reading information.

Reference numeral HD1 denotes a CTL head for recording or reading a control signal CTL according to a predetermined control signal, and reference numeral 30 denotes driving control of the CTL head HD1 under the control of the microprocessor 33. CTL head driver 31 denotes an amplifier for amplifying the signal detected by the CTL head HD1, and reference numeral 32 denotes a square wave of the control signal CTL amplified by the amplifier 31 using a Schmitt trigger or the like. A waveform shaping circuit for shaping a waveform, reference numeral 34 receives a square wave pulse output from the waveform shaping circuit 32 and outputs a digital code signal corresponding to the duty ratio based on the duty ratio of the pulse. It is a pulse judgment unit.

Reference numeral 35 is a CTL code information storage unit for storing the date information corresponding to the code signal with respect to the code signal detected by the pulse determination unit 34, and 36 is the microprocessor 33. OSD generation section for outputting the hue signal (R, G, B) and blanking signal (Y ') of the predetermined OSD pattern according to the control, 37 from the output signal of the OSD generating section 36 and the amplifier 21 A mixer which mixes the outputted video signal and outputs it to a video output device such as a TV through an output terminal P _out2 . Reference numeral 38 denotes a timer for generating predetermined time data for counting the current time.

That is, the conventional VSS function VCR having the above-described configuration has a microprocessor 33 as illustrated in (d) of FIG. 2, in response to a user inputting a recording execution command through the remote control device 1. Records the service information by recording a control signal (CTL) signal of 7: 3 or 3: 7 duty ratio instead of the normal 4: 6 duty ratio based on the current time data counted by the timer 38. At the time of reproduction, the service information is read out in the reverse order of the above process.

However, the above-mentioned control (CTL) signal is a signal originally used for the phase control of a capstan motor, and if it is arbitrarily modified and used, there is a possibility that the servo control may become unstable, and the control (CTL) signal may have a small amount. Since the service information is recorded by modifying a duty ratio, there is a problem that it is difficult to provide accurate information.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a video cassette recorder configured to realize a VHS Index Search System (VISS) function by adjusting a brightness level of a recorded video.

Fig. 1 is a functional block diagram for explaining a VIS signal recording process of a conventional VCR.

2 is a diagram illustrating an example of recording CTL information.

Fig. 3 is a block diagram showing an internal configuration of a video cassette recorder having a bis signal recording function using a luminance level according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: Remote controller 2: Receiver

33,39: microprocessor 4: supply reel

5: Rewind 6: Head for recording / playback

7: R / P head drive unit 8: switching unit

9: Y-C separation unit 10: FM modulation circuit

11: frequency low frequency conversion circuit 12,20: mixer

13, 14, 21, 31: amplifier 15: audio head drive

16: HPF (High Pass Filter) 17: FM demodulation circuit

18: LPF (Low Pass Filter) 19: Frequency High Frequency Conversion Circuit

22: preamplifier 30: CTL head drive unit

32: waveform shaping circuit 34: pulse judgment unit

35: CTL code information storage unit 36,40: OSD generation unit

37: MIXER 38: Timer

41: Mixer 42: Counter

43: luminance level detection unit HD1: CTL head

A video cassette recorder having a bis signal recording function using a luminance level according to the present invention for realizing the above object has a luminance of a video signal input terminal for receiving a video signal and a video signal applied through the video signal input terminal. A recording signal processing unit which separately modulates a signal in a first frequency domain and a hue signal in a second frequency domain, and generates an OSD pattern of an OSD pattern signal of a white screen having a luminance level greater than or equal to a predetermined value according to a predetermined control command. And a mixer for mixing and outputting the output signal of the recording signal processing unit and the output signal of the OSD generating unit, a video signal recording unit for recording the mixed video signal according to a predetermined control signal, and a tape according to the predetermined control signal. A video reproducing section for reading recorded video signals, a reproducing video processing section for demodulating the signals read out by the video reproducing section, and The luminance level detector detects the luminance level of the signal output from the live image processor, and controls the OSD generator during recording so that an image signal having a predetermined luminance level is recorded at either the beginning or the end of the recording section, and during playback. And a controller for controlling to detect the corresponding portion through the luminance level detection unit.

That is, according to the present invention having the above-described configuration, by recording the white screen for a predetermined time at the beginning or the end of the recorded video, the luminance level is adjusted to determine the recording position based on the detection time of the white screen during playback. The bis signal recording function VCR can be realized.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention.

FIG. 3 is a block diagram showing an internal configuration of a video cassette recorder having a bis signal recording function using a luminance level according to an embodiment of the present invention. FIG. The same reference numerals are used, and detailed description thereof will be omitted.

In FIG. 3, reference numeral P _in denotes a video signal input terminal for receiving a video signal applied from a TV receiver or a camcorder connected to a VCR, and reference numeral 9 denotes a video signal input terminal P _in to the device. YC separation unit for dividing the applied video signal into a luminance signal (Y) and a color tone signal (C), and outputs a frequency signal (FM) of the luminance signal (Y), which is separated and output from the YC separation unit (9) FM modulator circuit, 11 is a frequency low-pass converter circuit for converting the tone signal (C) is separated from the luminance signal output from the YC separation unit 9 into a low-band frequency signal, and 12 is the FM modulator circuit 10 And a mixer (MIXER) for mixing the luminance signal (Y) and the hue signal (C) output from the frequency low pass conversion circuit (11), respectively.

Further, reference numeral 40 denotes an OSD generator which outputs an OSD pattern signal of a white screen having the highest luminance level Y according to a control command from the microprocessor 39, and 41 denotes an OSD pattern of the mixer 12. The first mixer 13, which mixes an output signal and an output signal of the OSD generator 40 and outputs the mixed signal, amplifies the amplified image signal mixed by the first mixer 41 to a predetermined level and converts the amplified signal into the switching unit 8. Amplification unit supplied to a fixed terminal (R;) of recording, reference numeral 42 denotes a counter for counting recording and playback time of a white screen, and 43 a luminance of a reproduced video signal output from the amplifying unit 21. The luminance level detection unit outputs a high level detection signal, for example, when a level signal is detected to detect a level or more.

Next, the operation of the device having the above configuration will be described.

When the user inputs a recording command through the remote control device 1, the microprocessor 39 switches the switching contact of the switching unit 8 to the fixed contact point R and at the same time the R / P head driver 7 ), The video signal applied and processed through the video signal input terminal (P _in ) is recorded.

On the other hand, when the user inputs a recording stop command through the remote control device 1, the microprocessor 39 immediately controls the OSD generator 40 to stop driving the recording operation. The OSD pattern signal on the (WHITE) screen is output.

As a result, the OSD generation unit 40 outputs the white screen OSD pattern signal having the luminance level Y equal to or greater than a predetermined value to the first mixer 41, and the first mixer 41 is the mixer. The video signal outputted from (12) and the output signal of the OSD generator 40 are mixed and supplied to the recording / reproducing head 6 through the amplifier 13 so that the back contracted at the end of the recorded content is provided. The screen will be recorded.

On the other hand, at this time, the time for recording the white screen is managed by the microprocessor 39 on the basis of the counter value of the counter 42, the microprocessor 39 is 50 counts of the counter 42 from the next recording time. By setting the addition in units of [msec], the recording positions of the service information recorded by the above-described process are distinguished.

Then, when the user selects the playback function through the remote control device 1, the microprocessor 39 switches the switching contact of the switching unit 8 to the fixed contact (P) side and at the same time the R / P head drive unit The reproducing operation is executed by driving the recording / reproducing head 6 through 7. The reproduced video signal is amplified to a predetermined level while passing through the preamplifier 22.

On the other hand, the luminance signal Y of the reproduced video signal reaches the mixer 20 through the high pass filter 16 and the FM demodulation circuit 17, and the hue signal C is the low pass filter 18. And the mixer 20 reaches the mixer 20 through the frequency trade conversion circuit 19, and the reproduced video signal mixed by the mixer 20 is amplified by the amplifier 21 to a predetermined level.

Meanwhile, the luminance level detector 43 checks the luminance level of the reproduced video signal output from the amplifier 21, and outputs a high level signal to the microprocessor 39 when the luminance level is equal to or greater than a predetermined value. .

At this time, the microprocessor 39 counts the time for which the high level detection signal is applied through the counter 42. The microprocessor 39 recognizes the recording position based on the count value.

That is, according to the above embodiment, by recording the white screen for a predetermined time at the end of the recording, the non-signal recording function VCR can be realized by adjusting the luminance level to determine the recording position based on the detection time of the white screen during playback. It becomes possible.

Meanwhile, the present invention is not limited to the above embodiments and can be variously modified within the scope not departing from the technical gist of the present invention. For example, instead of a white screen having a high luminance level, the luminance level is reversed. It can also be configured to realize the VIS function using a low black screen.

As described above, according to the present invention, it is possible to realize a video cassette recorder configured to realize a VHS (VHS Index Search System) function by adjusting the brightness level of a recorded video.

Claims (1)

A video signal input terminal for receiving a video signal; A recording signal processing unit which separately modulates the luminance signal in the first frequency region and the hue signal in the second frequency region with respect to the video signal applied through the video signal input terminal; An OSD generator for outputting an OSD pattern signal of a white screen having a luminance level equal to or greater than a predetermined value according to a predetermined control command; A mixer for mixing the output signal of the recording signal processor and the output signal of the OSD generator; A video signal recording unit for recording the mixed video signal in this mixer according to a predetermined control signal; An image reproducing unit which reads out an image signal recorded on a tape according to a predetermined control signal; A playback image processing section for demodulating the signal read out by the video playback section; A luminance level detector for detecting a luminance level of a signal output from the reproduced image processing unit; And And a controller for controlling the OSD generating unit to record an image signal having a predetermined luminance level at either the beginning or the end of the recording section during recording, and to detect the corresponding portion through the luminance level detecting unit during playback. And a video cassette recorder having a bis signal recording function using a luminance level.