Victor Company of Japan, Limited

Kazuyuki Ebihara

Shigehiro Ito

Yuji Nishi

Tatsushi Koguchi

Izuru Shirai

Kiyoshi Fujiwara

Tatsushi Kouguchi

Tatsushi Kuguchi

A television receiver has a main body and a remote-control transmitter. A display having an aspect ratio of 16:9 visualizes an incoming video signal. A picture analysis circuit is operative for analyzing the incoming video signal, An aspect converting circuit is operative for changing an aspect condition of indication of the incoming video signal on the display. A button is provided on one of the main body and the remote-control transmitter for commanding automatic aspect conversion when being operated. A decision is made as to whether or not the button is operated to command automatic aspect conversion. When the button is decided to be operated, the picture analysis circuit is activated to analyze the incoming video signal and the aspect converting circuit is controlled to automatically control the aspect condition of indication of the incoming video signal on the display in response to a result of the analysis by the picture analysis circuit.

Television receiver with adjustable frame size

A television receiver has a main body and a remote-control transmitter. A display having an aspect ratio of 16:9 visualizes an incoming video signal. A picture analysis circuit is operative for analyzing the incoming video signal. An aspect converting circuit is operative for changing an aspect condition of indication of the incoming video signal on the display. A button is provided on one of the main body and the remote-control transmitter for commanding automatic aspect conversion when being operated. A decision is made as to whether or not the button is operated to command automatic aspect conversion. When the button is decided to be operated, the picture analysis circuit is activated to analyze the incoming video signal and the aspect converting circuit is controlled to automatically control the aspect condition of indication of the incoming video signal on the display in response to a result of the analysis by the picture analysis circuit.

Television receiver with an adjustable frame size

A television ghost removal apparatus comprises a transversal filter that receives input television signals, compensates waveform distortion included in the signals, and removes a ghost component; a waveform extractor that extracts signal waveforms of predetermined periods that include reference signals for ghost detection from the television signals; a coefficient setter that compares reference waveform signals and the extracted signal waveforms to obtain error signals, and sets coefficient data corresponding to the error signals, and in accordance with this coefficients data, changes filter coefficient of the transversal filter; a band limiter means for removing unnecessary high-region components included in the coefficient data, and supplying the coefficient data from which the unnecessary high-region components have been removed to the transversal filter means, the unnecessary high-region components being outside a frequency band of the reference signal; and a counter means for counting the number of times that the coefficient data have been generated by the coefficient setting means until the television signals return to a status where ghost has been removed, and for activating the band limiter means when the number of times reaches a predetermined number.

Apparatus for removing ghost from television signals including a

A ghosting cancel apparatus which can reduce the circuit scale through the use of a one-line memory to remove ghosting, comprises an A/D conversion circuit, a timing signal generation circuit, a one-line memory, a field number register, a calculation processing circuit, a transversal filter, and a D/A conversion circuit. The timing signal generation circuit supplies ghost cancel reference (GCR) field numbers to the field number register, write enable signal to the one-line memory, and read enable signals to a microprocessor inside the calculation processing apparatus. When the one-line memory receives write enable signals, and extracts GCR basic signals from the transversal filter to store them. When the microprocessor receives the read enable signals, and stores it in the waveform memory inside the calculation processing apparatus. The microprocessor performs calculation processing for compensation signals as a weighting coefficient for the transversal filter and sets and supplies it and as a result, removes ghosting from image signals.

Apparatus which employs the variable weighing coefficients for a

A waveform distortion removing apparatus includes a digital filter having taps and being controlled in response to tap coefficients. An error signal sequence is generated from a video signal. The error signal sequence contains a waveform distortion. A quadrature signal is generated which has a quadrature relation with the error signal sequence. An absolute value of the quadrature signal is derived. The absolute value of the error signal sequence and the absolute value of the quadrature signal are compared with each other. A greater of the absolute values is selected. The tap coefficients are set in dependence upon the selected greater of the absolute values.

Apparatus for removing waveform distortion from a video signal

A transversal filter filters an input video signal with a variable filtering characteristic. A waveform of a ghost cancel reference signal is periodically extracted from the input signal. An average of the successively-extracted waveforms is calculated. The filtering characteristic is determined on the basis of the calculated average of the extracted waveforms. An extracted waveform which is contaminated by an error or a jitter is rejected and is prevented from being used in the calculation of the average of the extracted waveforms.

Ghost canceler with adaptive transversal filter

Waveform distortion removing apparatus

A television ghost removal apparatus comprises a transversal filter that receives input television signals, compensates waveform distortion included in the signals, and removes a ghost component; a waveform extractor that extracts signal waveforms of predetermined periods that include reference signals for ghost detection from the television signals; a coefficient setter that compares reference waveform signals and the extracted signal waveforms to obtain error signals, and sets coefficient data corresponding to the error signals, and in accordance with this coefficients data, changes filter coefficient of the transversal filter; an S/N measurer that measures signal to a noise ratio (S/N) of the television signals; and an S/N judgment circuit that prohibits change of the filter coefficient by the coefficient setter when the S/N has deteriorated, and that initializes the coefficient data when the S/N has recovered to a favorable status. In addition, there can be provided a band limiter circuit that removes unnecessary high-region components outside a frequency band of the reference waveform signal.

Television signal according to the signal-to-noise ratio of the

An apparatus for removing a ghost component which disturbs a picture signal by means of a ghost canceling reference signal included therein. The reference signal is extracted from the picture signal and judged as to whether it has a specific level in a reference time interval. The extracted reference siganl is also judged as to whether a color burst signal is canceled. If both judgements are positive, a judgement signal is generated which allows the extracted signal to be examined how it is disturbed by the ghost component. In response to the examination, the ghost component is removed from the picture signal.

Apparatus for removing ghost component disturbing picture signal

A ghost cancelling device including a filtering portion made up of a transversal filter for cancelling a ghost component included in input video signals, a waveform extracting circuit for extracting a part, which corresponds to a predetermined period of time and includes a reference signal for cancelling a ghost, of a signal included in the input video signal, a waveform converting circuit for performing the waveform conversion of the signal corresponding to the predetermined of time and extracted from the input video signal, a subtracter for comparing an output of the waveform converting circuit with a preset reference waveform and outputting a signal in accordance with the result of the comparison, a coefficient setting circuit for setting coefficients having values in accordance with the output signal of the subtracter and a waveform checking circuit interposing between the waveform extracting circuit and the waveform converting circuit. The waveform checking circuit decides whether or not the output of the waveform extracting circuit should be sent to the waveform converting circuit. Thus, the ghost cancelling device can interrupt an operation of cancelling a ghost when the input video signal is abnormal and prevent occurrence of a malfunction and a runaway.

Ghost cancelling device with waveform checking circuit

A transversal filter filters an input video signal with a filtering characteristic determined by tap gains. A row of error signals are generated on the basis of a difference between a ghost cancel reference signal in the input video signal and a predetermined reference signal. A magnification setting circuit sets a first magnification in accordance with the row of the error signals. A weight setting circuit converts an output signal from the magnification setting circuit into weighting data and feeding the weighting data into the transversal filter as the tap gains. The weight setting circuit functions to correct the first magnification into a second magnification in accordance with row numbers denoting the respective error signals in the row.

Ghost canceller employing plural reference signals

Ghosts from an input video signal are substantially eliminated by supplying to the signal a filter for deriving an output video signal. A weight setting circuit controls the filter frequency response. A control signal for the weight setting circuit sets the filter frequency response to substantially eliminate the ghosts. The control signal is derived by responding to one of the video signals to derive a first digital signal that extracts a pulse-like signal having a predetermined time period from the video signal. The position in the time axis of a peak of the first signal is detected to generate a signal having a reference waveform at the time corresponding to the detected position in the peak time-base. A second signal having a value representing the magnitude of the relative values of the first signal and reference waveform is derived. A third signal representing a criterion function for the presence of a ghost in the input video signal is derived in response to a unipolarity function of the average value of the value of the second signal. The second and third signals control the value of the control signal for the weight setting circuit.

Growing community of inventors

Toride, Japan

Kazuyuki Ebihara