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6285765 |
Method and apparatus for reducing effects of copy protection of composite video signal
Copy protection for composite video signals is well known. Copy protection, while it does not prohibit making a copy per se, does render any copy (recording) of the video signal relatively...
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6172713 |
Color television system determination circuit
A color system determination circuit for use with an input video signal having a frequency component is disclosed. The circuit includes a color trap filter for attenuating the frequency component...
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6173110 |
Magnetic recording and reproduction apparatus having a recording characteristic correction function of a video signal
A magnetic recording and reproduction apparatus corrects recording characteristics of a video signal. The apparatus comprises a luminance test signal generator for generating a frequency-modulated...
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6134373 |
System for recording and reproducing a wide bandwidth video signal via a narrow bandwidth medium
An encoder separates luminance and chrominance signal components of a composite video signal. The frame-to-frame changes in the luminance signal are detected, and a motion signal is derived...
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6101312 |
Automatic picture quality controller
An automatic image quality-controlling device, where an FM signal output from a video head is amplified in an AGC amplifier to a uniform amplitude level. A lower-sideband variable peaking amplifier...
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6014180 |
Automatic gain control loop circuit
In an automatic gain control loop circuit supplied with two channel signals alternately input thereto, a first capacitor filter and stores the first signal output from the level detector circuit,...
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RE36339 |
Circuit for tape duplication in video tape recorder
The invention provides a FM signal transfer-recording system of VTR including; a RF output signal through the low pass filter of the reproduction set is applied to the pre-amp through the high...
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5913007 |
Envelope detection apparatus for video cassette recorder
A video cassette recorder envelope detection apparatus which can accurately detect an envelope reflecting the state of a system. The envelope detection apparatus may include a reference voltage...
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5909531 |
Television signal recording/reproducing apparatus and method with DC shifter
Recording and reproducing a television signal with a DC shifter prevents compression distortion of a PAL plus television signal. The PAL plus television signal includes a vertical resolution signal...
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5875278 |
Recording/reproducing device comprising a plurality of audio channels and a rotary encoder which controls two independent level adjusting means
A device for adjusting audio and video signals includes two rotary encoders, one for plural audio adjusting circuits which are arranged to adjust audio signals and the other for plural video...
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5745635 |
Adaptive deemphasis and reemphasis of high frequencies in video tape recording, utilizing a recorded control signal
A video signal recording system is disclosed which includes a circuit for generating a control signal representative of the level of the high-frequency portion of a full-bandwidth luminance signal....
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5606424 |
Simple high-band record modulation circuit in 8MM video tape recorder
A record modulation circuit having a first frequency deviation amount determiner for determining the frequency deviation amount suitable for a normal recording mode, and a second frequency...
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5598273 |
Recording control device and method utilizing a test signal having multiple frequencies
In a magnetic recording control device, a plurality of test signals of different frequencies are recorded on and reproduced from a magnetic recording medium, and the reproduction levels of the test...
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5532829 |
Automatic color control circuit having a control signal storing capacitor
A control circuit includes: a capacitor for normal reproduction which stores an output of a reproduction color burst level detection for automatic color signal level control in a color signal...
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5448367 |
Apparatus for automatically controlling generation of a head switching signal
An apparatus and a method for automatically controlling pulse generation. The apparatus comprises a drum having video heads, a pulse generating head and a frequency generation head, first and...
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5432612 |
Multi-mode video signal playback and display device
A multi-mode display device is made integral with a multi-mode video signal recording and play-back device to enable a control circuit and a control signal to be made in common to each other, With...
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5430551 |
Video recorder with distortion corrector circuit
A brightness signal distortion correction circuit (8, 11, 21) is provided for a video recorder, having distortion correction circuit (11), responsive to frequency-modulated brightness signals, and...
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5430495 |
Video playback apparatus capable of varying caption brightness based on audio level
Disclosed is a video playback apparatus which functions to vary the brightness of the caption color of a displayed caption according to audio level of the playback. The video playback apparatus...
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5418619 |
Apparatus and method for selectively adapting a playback characteristic to meet video performance requirements
In a backward compatible video signal recording and playback system for recording a full bandwidth video signal on a limited bandwidth medium utilizing a luminance signal having high frequencies...
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5404230 |
Color burst phase correcting color signal reproducing circuit
A color signal reproducing circuit comprising a phase correction device receiving a gain-controlled composite color signal, detecting color burst signal in a composite color signal and correcting...
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5386296 |
Chroma burst detection system
A video cassette recording (VCR) playback system includes circuitry for separating the components of a video signal to produce luminance information and color-under information. The separated...
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5377012 |
Color signal processing circuit for a video cassette recorder
A color signal processing circuit for a VCR includes: an APC circuit for recording; an APC circuit for playback; a first circuit providing a color signal for recording; a second circuit providing a...
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5371601 |
Luminance signal unfolding and reemphasizing circuit
A video playback device for playing back a video signal recorded to a recording medium such as a magnetic tape by folding a high frequency signal component onto a low frequency signal component. A...
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5347319 |
Circuit for regulating the color subcarrier amplitude in a video recorder
A circuit for regulating the color subcarrier amplitude in a video recorder used with a television receiver which employs overscanning of the electron beams for different modes of operation...
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5333060 |
Video signal processing circuit of a video signal recorder/reproducer
Video signal processing circuits which improves an adaptive folding circuit and an adaptive unfolding circuit for lowering and restoring the signal level of a high frequency component in processing...
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5321518 |
Video signal recording and reproducing apparatus using an added specific signal during recording
In a video signal recording/reproducing apparatus for emphasizing an input video signal, recording by adding an additional signal necessary for recording, and de-emphasizing when reproducing, the...
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5287174 |
Vertical resolution correcting circuit for video signal
In a vertical resolution correcting circuit, a noncorrelation component in a vertical direction of a luminance signal included in a video signal is detected. In a region where it is considered that...
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5249063 |
Information signal processing device for offset removal and signal identification of color difference signals
A signal processing device for processing an information signal is arranged to detect a signal included in the information signal and appearing during each given blanking period of the information...
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5235431 |
Circuit used in a camcorder for monitoring the recorded state of a tape during recording by simultaneous playing back of the tape
A circuit used in a camcorder for monitoring the recorded state of a tape during recording by simultaneous playing back of the tape comprising first and second record/playback heads mounted on a...
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5233435 |
Tape recording system for video cassette tape recorder
A tape recording system for use in a video cassette tape recorder capable of recording a reproducing signal of a video tape to another video tape by directly interfacing the reproducing high...
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5227891 |
Method of recording fine color video signal on optical recording media and method of reproducing thus recorded fine color video signal
A fine color video signal including a fine component in a high frequency area has a level of an upper side band of the fine component raised by a predetermined level after FM modulation. An...
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5223946 |
Apparatus using comparator to detect drop-out of recorded video signal
A drop-out detecting apparatus comprises an amplitude detecting circuit supplied with a high frequency video signal reproduced from a record medium, a first smoothing circuit supplied with a...
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5218447 |
Method and apparatus for identifying the reproduction mode of a video tape recorder
A reproduction mode identification circuit (1) is responsive to a horizontal synchronizing signal and a color rotary pulse for identifying whether the reproduction state of a double azimuth 4 head...
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5206738 |
Magnetic recording apparatus having a means for determining recording current
A video tape recorder has a recording current setting unit for setting recording currents to be supplied to a recording head for recording audio and video signals on a magnetic tape. The recording...
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5194963 |
Dual deck videocassette recorder system
A videocassette deck and taping system includes two videocassette decks therefor (A and B) included within a single housing utilizing a common power supply, tuner, controls, and switching and...
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5187590 |
Luminance signal recording circuit and method for maintaining compatibility in reproducing between different video systems
An improved adaptive folding circuit for a video signal recording/reproducing system. The improved adaptive folding circuit has an adaptive emphasis circuit and an adaptive deemphasis circuit for...
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5184228 |
Recording circuit for mirror mother tape
In a recording apparatus for a mirror mother tape to be used in a contact-type magnetic printing process, a chrominance signal of an incoming color video signal is converted into a down converted...
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5161030 |
Method and circuit for enhancing image quality of a video tape recorder (VTR) using motion adaptive spectrum folding method
A picture quality improvement circuit and method for a video tape recorder wherein the luminance and chrominance signals are separated from an input video signal, and the luminance signal is...
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5144434 |
Video signal processing device using look-up table
A video signal processing device is arranged to supply a digital video signal to an infinite impulse response digital filter, to supply the digital video signal from the filter to a look-up table...
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5136392 |
Frequency demodulating circuit for avoiding black reversing phenomenon
In a video reproducing apparatus having a head for reproducing a recorded frequency modulated signal and a frequency demodulator for demodulating the reproduced signal output from the head, a...
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5130810 |
Method and apparatus for processing a video signal so as to prohibit the making of acceptable videotape recordings
A video signal is modified so that a television receiver still produces a normal color picture from the modified signal, whereas a videotape recording of this signal produces generally unacceptable...
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5121266 |
Magnetic recording/reproducing apparatus
A reproducing circuit for use in a magnetic recording and reproducing apparatus having a recording circuit operable to record a video luminance signal in either a conventional recording mode or in...
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5083211 |
Method and apparatus for optimizing video recording and reproduction
A method and apparatus for automatically compensating for variations in recording medium, performance of the recording/playback head and the efficiency of the head/medium interface during video...
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5063452 |
Magnetic recording and/or reproducing apparatus having means for preventing audio-to-video crosstalk and noise generation
A magnetic recording apparatus comprising an audio signal processing circuit for converting an input analog audio signal into a digital audio signal; a modulating circuit for subjecting the digital...
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5032925 |
Circuit for identifying when a reproduced color video signal has been recorded in a high-band or low-band mode
A recording mode identifying circuit is provided for use in a magnetic recording and/or reproducing apparatus capable of recording a color video signal in a first or low-band mode in which a...
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5003413 |
Tracking control circuit of helical scanning magnetic tape apparatus
In a digital audio magnetic tape reproducing apparatus of herical scanning using two magnetic heads, a first head reproduces a pilot signal of its own track and two pilot signals of both...
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4998172 |
Secondary beat signal cancel circuit
A magnetic reproducing apparatus is provided with an improved secondary beat signal cancel circuit for reducing a secondary beat signal of a low-frequency converted chroma signal leaked into a...
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4994923 |
Video signal recording and reproducing apparatus with signal processing circuit for improvement of picture quality
Herein disclosed is a color video signal recording and reproducing apparatus for recording and reproducing a luminance signal as a frequency-modulated wave and a chrominance signal as a...
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4958234 |
Distortion eliminating circuit
A distortion eliminating circuit for eliminating a harmonic distortion from an input frequency modulated luminance signal comprises a comparator for producing a series of output pulses responsive...
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4956726 |
Information signal reproducing apparatus in which control signal condition and information signal level are varied so as to correspond
The disclosure recording and reproducing apparatus is arranged to have a control signal recorded in a predetermined track on a recording medium and is arranged to control the reproduced level of an...
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