摘要:
A video reproduction signal-processing circuit is an integrated circuit and is incorporated in a video tape recorder. In this integrated circuit, a dropout-detecting circuit (11) generates a dropout signal, and a limiter circuit (19) and a wave-shaping circuit (22) jointly output a noncorrelation/correlation signal. The dropout signal and the noncorrelation/correlation signal are first added together by an adder circuit (12), and are then output from the integrated circuit through a single output terminal (13).
摘要:
A dot crawling interference elimination device and a color subcarrier vertical correlation detection device, which comprise a color subcarrier vertical correlation detection device (10) for a video signal, an adaptive three-dimensional Y/C separation unit (9), and an adaptive notch filter (14) of a color signal band, detect vertical correlation of a color subcarrier in a non-standard signal, such as a signal reproduced from a home VCR or a special signal reproduced from an optical VDP system, that does not strictly meet the standards of the NTSC system or the PAL system, thereby to discriminate non-standard characteristics of the signal, and eliminate a color signal component, which mixes into a luminance signal when a motion-adaptive Y/C separation is carried out for the non-standard signal, by using an adaptive notch filter that suits a non-standard state of the input image signal.
摘要:
A video signal reproducing apparatus has a filter circuit (31) interposed in a transmission path for a reproduced luminance signal, and the characteristic of the filter circuit (31) desirably includes a band-eliminating characteristic and a comb-filter passband characteristic which can be selectively emphasized. When the reproduced luminance signal has a normal or relatively smaller frequency bandwidth or a relatively small line correlation component, or when the level of the reproduced carrier chrominance signal is high, the band-eliminating characteristic of the filter circuit is emphasized. The foregoing video signal reproducing apparatus is particularly suited for reproducing a color video signal that includes a wide band luminance signal, in which case the comb-filter passband characteristic of the filter circuit is selected or emphasized so as to reduce noise near the color subcarrier frequency, to avoid displacement of a reproduced picture of high definition in the vertical direction and also to avoid interference caused by the vertical non-correlation component of a color picture.
摘要:
A dropout compensation circuit for a video reproducing system includes a signal generating circuit (12,14,16,22) for generating sum and difference signals corresponding to the sum and difference of the input chrominance and luminance signals, and for adding the difference and sum signals, after delaying the difference signal by one horizontal scanning period, to produce an output signal whose crosstalk component is eliminated, a signal separating circuit (20, 32, 34) adapted to separate the chrominance and luminance signals from the delayed difference signal after delaying the delayed difference signal by one horizontal scanning period, and a signal selecting circuit (10, SW1, SW3) adapted to supply the chrominance and luminance signals of the signal separating circuit (20, 32, 34) to the signal generating circuit (12, 14, 16, 22) when it is determined that the reproduction signal is dropped out.
摘要:
A controller 112 checks and determines whether or not an electronic apparatus 11 is electrically connected. When a TV signal processor 106 is not connected to another apparatus, i.e., the electronic apparatus 11, a signal processing circuit 113 performs normal signal processing. When the TV signal processor 106 is connected to another apparatus, i.e., the electronic apparatus 11, the TV signal processor 106 cooperates with the compliant electronic apparatus as if they were a single apparatus and performs optimal processing of an input signal. In an ID table stored in the controller 112, processing information concerning processing tasks to be shared with the compliant electronic apparatus is associated with the function ID of the compliant electronic apparatus.
摘要:
A VHS video recorder includes in the playback path a comb filter with a two-line delay line to reduce cross colour. The two-line delay causes colour distortion during playback, especially in vertical black and white colour transitions. The aim is to reduce such distortions without using extensive circuitry. A line-delay line used in playback to suppress interference or to compensate for signal loss is connected in recording mode to the luminance signal path (Y).
摘要:
In a magnetic recording apparatus or magnetic recording/reproducing apparatus having a frequency modulator for frequency-modulating an information signal to be recorded in a recording system, a reference signal is recorded and reproduced so that recording or reproducing characteristics of the information signal are controlled in accordance with a level of the reproduced reference signal, whereby the recording or reproducing characteristics can be set so as to match a characteristic of a magnetic recording medium. In this apparatus a DC-voltage source for selectively supplying a predetermined level of a DC-voltage to said frequency modulator is provided so that an output of said frequency modulator obtained by supplying the DC-voltage to said frequency modulator is used as the reference signal.
摘要:
In a magnetic producing apparatus a noise canceller is comprised having a frequency-modulated reproduced level detector for detecting a reproduced level of a reproduced frequency-modulated luminance signal, means for extracting noise components from a luminance signal demodulated from said frequency-modulated luminance signal, a slice circuit having a slice level for removing components whose levels are higher than a predetermined level from the noise component and controlling the slice level so as to decrease with increasing values of the reproduced level, and a subtractor for subtracting an output of said slice circuit from said luminance signal, wherein a chroma level detector for detecting a level of a reproduced chroma signal is provided, so that a slice level of said slice circuit is controlled so as to be increased with increasing values of the detected chroma level.
摘要:
In a magnetic reproduction apparatus having a line noise canceller which delays a luminance signal of a reproduced video signal for a single horizontal scanning period, the delayed luminance signal is subtracted from the non-delayed original luminance signal, only a small-level signal is extracted from the subtracted signal, the small-level signal being deemed as a noise component. Said small level signal is subtracted from the original luminance signal to substantially cancel the noise component. Means are provided for detecting the level of the reproduced signal, and said line noise canceller is made inoperable when the level of the reproduced video signal is higher than a predetermined level.