Disclosed are a display apparatus and a method of controlling the display apparatus. The display apparatus includes: a signal receiver configured to receive a broadcasting signal; a display configured to display an image based on the received broadcasting signal; a sound receiver configured to receive a sound spoken by a user; a first sound recognizer configured to be supplied with power when the display apparatus is in a standby mode, and determine whether the received sound is a reserved word candidate having a high probability of corresponding to a reserved word; a second sound recognizer configured to be supplied with power when the received sound is determined as the reserved word candidate and to determine whether the received sound is the reserved word; and a controller configured to control the preset operation to be performed when the received sound is determined as the reserved word.

Electronic apparatus and control method thereof

A clock generator produces a frequency-modulated clock. A master phase-locked loop (PLL) includes a voltage summer that outputs a voltage to a voltage-controlled oscillator (VCO). The voltage to the VCO determines the frequency of the clock generated. A modulated voltage is subtracted by the voltage summer to produce voltage and thus frequency modulations. This modulated voltage is produced by a second loop that operates as a slave to the master PLL. The slave loop is a voltage-locked loop. The peak amplitude of the modulated voltage is locked to a control voltage of the master PLL. The control voltage is a stable voltage input to the voltage summer that is generated by phase comparisons of the output clock to a reference clock. To overcome the problem of locking to the modulating output clock, phase comparison is performed only at the same point in the modulation cycle, at the beginning of each modulation cycle. Thus modulations do not affect phase comparisons. The modulated voltage is generated by a waveform generator in the slave loop. The waveform generator is controlled by a feedback divider that also controls when phase comparison is performed. The amplitude of the waveform is adjusted to track the control voltage of the master PLL by comparing the control voltage to the modulated voltage, but only at the beginning of the modulation cycle. The modulation amplitude is kept constant over different supply voltages, ambient temperatures, and process corners.

Dual-loop spread-spectrum clock generator with master PLL and slave voltage-modulation-locked loop

This invention is a method and apparatus for identifying and separating the synchronizing signal component of video like signals by identifying or detecting the arrangement or sequence of the known occurances of events or patterns of the sync. The invention also provides for establishing data slicing references in response to the levels of known portions of the sync component.

Synchronizing signal separating apparatus and method

A display device including a display section having a plurality of pixel electrodes; and a plurality of drive electrodes extending in a first direction and arranged side-by-side in a second direction. Each of the drive electrodes has a width in the second direction corresponding to a size of the two or more pixel electrodes, and has one or more slits extending in the first direction.

Display device with touch detection function

The challenge of the present invention is to suppress a variation in brightness of an image and make a reference value of a black level converge at an appropriate value in a short time. Acondition judgment circuit judges whether or not a frame of an amount of change in gains of a variable gain amplifier being equal to or greater than a threshold continues for a predefined frames or more. If a frame of an amount of change in the gains being equal to or greater than the threshold continues for the predefined frames, a black level value of the current frame is set for new black level reference. If not continues for the predetermined number, the previous black level reference value is retained in lieu of correcting the black level.

Semiconductor integrated apparatus and black level correction method for image sensor

A detector circuit detects a voltage corresponding to the leakage current that flows through the cathode electrode of a color display during a vertical blanking period of a video signal. The voltage detected is held in a first sample-and-hold circuit. Meanwhile, a reference signal corresponding to the reference black level is input during a part of the vertical blanking period of the video signal. A voltage corresponding to the leakage current that flows through the cathode electrode of the color display during the part of the vertical blanking period is detected by the detector circuit and then held in a second sample-and-hold circuit. The voltage held in the first sample-and-hold is subtracted from the voltage held in the second sample-and-hold circuit. A comparator circuit compares the difference between these voltages with a reference voltage. The result of the comparison controls a cutoff adjustment circuit for adjusting a DC level of the video signal.

Automatic white balance adjusting circuit in color image display

An auto-tuning circuit for automatically adjusting the transfer function of an active filter for processing video signals. A voltage-controlled filter is used as active filter, for imparting a predetermined transfer characteristic to a signal having a component related to a television signal. The transfer characteristic can be adjusted in accordance with a voltage. The auto-tuning circuit comprises PLL section connected to the voltage-controlled filter, and switching circuit. The PLL section applies to the voltage-controlled filter a control voltage corresponding to the phase difference between a reference signal and an output signal obtained by passing the reference signal through the voltage-controlled filter. The switching section allows transfer of signals between the voltage-controlled filter and the PLL section for at least one of the horizontal blanking period and vertical blanking period of the television signal.

Auto-tuning circuit for an active filter used in video signal processing

A horizontal synchronizing apparatus includes a source for providing a horizontal synch. signal, a horizontal deflection circuit for generating a deflection current having scanning intervals and blanking intervals repetitively successing in response to driving pulses and having retrace pulses which delay from the driving pulses as a function of a load on the horizontal deflection circuit, a phase locked loop having an input, an output and a first feedback path, for producing from the output a substantial bi-level signal synchronized to the horizontal synch. signal applied to the input, and a phase controlled loop having an input, an output and a second feedback path, for maintaining the retrace pulses synchronous with the bi-level signals. The phase controlled loop has a phase detection circuit having a first input connected to the output of the phase locked loop and a second input connected to the deflection circuit, for producing a first polarity current in response to the bi-level signal when the retrace pulses are in a first state or a second polarity current in response to the bi-level signal when the retrace pulses are in a second state, a filter connected to the phase detection circuit for producing a control signal by filtering out undesired components of the first and second polarity signals, and a phase controllable device having a control input coupled to the output of the filter for producing the driving pulse which maintains the retrace pulses synchronous with the bi-level signals.

Horizontal synchronizing apparatus

A sync signal reproducing circuit for television receivers. The circuit comprises; a composite sync signal source for supplying a composite sync signal, a voltage controlled oscillator, a first frequency divider connected to the voltage controlled oscillator for dividing an oscillating frequency of the voltage controlled oscillator, a second frequency divider connected to the first frequency divider for generating a horizontal sync scan signal by dividing the divided output frequency further, a horizontal deflection circuit connected to the second frequency divider, the horizontal deflection circuit producing a flyback pulse referring to the horizontal sync scan signal, a downcounter connected to the first frequency divider for generating a vertical sync scan signal by counting down the divided output frequency, a phase detecting circuit connected to the composite sync signal source and the horizontal deflection circuit for performing a phase detection of the composite sync signal and a sawtooth signal obtained by converting a waveform of the flyback pulse, a connection circuit connected between the phase detecting circuit and voltage controlled oscillator for supplying a phase detecting output signal detected by the phase detecting circuit to the voltage controlled oscillator as a control signal, and a mask signal producing circuit connected between the downcounter and the phase detecting circuit for generating a mask signal which masks the phase detecting circuit for a fixed time on the basis of the count output from the downcounter.

Sync signal reproducing circuit in television receivers

A television receiver includes a first signal processing unit that generates contrast controlled first R, G and B signals and a second signal processing unit that outputs second on-screen R, G and B signals. A switching unit receives the first and second R, G and B signals and selectively outputs one of them to a color CRT. An ABL voltage, which changes in response to a level of video displayed on the CRT, is provided to the first and the second R, G and B signals. A control unit determines whether to execute the contrast control of the second R, G and B signals based on a ratio of video corresponding to the second R, G and B signals out of the total video displayed on the color CRT.

Hajime Sumiyoshi

Papers

Automatic white balance adjusting circuit in color image display

Auto-tuning circuit for an active filter used in video signal processing

Horizontal synchronizing apparatus

Sync signal reproducing circuit in television receivers

Television receiver that controls display contrast based on the type of videos being displayed