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8159618 |
Method for searching signal source and arranging signal terminals according to detected signal source
A method for searching a signal source suitable for a multimedia apparatus with multiple signal terminals is disclosed. The method provides an ordered search list of the signal terminals to save...
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7663431 |
Tuner and demodulating unit thereof
A tuner and a demodulating unit thereof are provided. A trap filter for a specific frequency is installed in the IF demodulating unit so as to eliminate a frequency signal acting as a beat component.
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7532257 |
System and implementation for IF compensation for video decoders
Base band compensation for an IF stage in a television provides significant advantages over compensation applied to the composite signal. Each base band color difference signal is filtered to...
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7483085 |
Digital implementation of analog TV receiver
An analog TV receiver implementation on DSP allows mobile platforms to view analog TV broadcasting on LCD displays. The analog television receiver includes a demodulator for demodulating a received...
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7298423 |
Time based digital FM demodulator
A time-based, digital FM demodulator circuit receives a stream of digital samples corresponding to an analog FM waveform. The samples are provided to a zero crossing detector, which allows a...
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7277134 |
Chrominance signal demodulation apparatus
An NTSC system chrominance signal demodulation apparatus is provided with a clock timing change circuit for burst-locking an input signal under the state where the phase is shifted by 90 degrees...
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7177640 |
Method of scanning channel of digital television
A method of scanning channels in a digital television including (a) setting a starting frequency; (b) searching for a first available digital channel by searching a search frequency that is the...
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7151576 |
Method and apparatus for modulating video signals
A luminance component of a video signal is modulated in a first frequency band. A first chrominance component of the video signal is modulated in a second frequency band and is mixed with an audio...
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7151574 |
Optimized structure for digital separation of composite video signals
A device and method are provided for implementing digital baseband separation of composite video signals with reduced memory requirements. The method and device require that only the composite...
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7126646 |
Device and method for tracking phase error in digital TV receiver
Device and method for tracking a phase error in a digital TV receiver, wherein a phase noise compensated I signal is subtracted from I level reference signals of VSB signal, to obtain an error of...
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6947096 |
Video processing apparatus for converting composite video signals to digital component video signals
A chroma-decoder 1 has two SRCs 17 and 21. The first SRC 17 performs down-conversion, changing the sampling rate of a composite video signal sampled with a system clock signal Cs to the sampling...
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6943847 |
FM demodulator for SECAM decoder
A SECAM decoder and an FM modulator therefor are disclosed, in which a demodulated color signal is provided to indicate deviations in the frequency of modulated color information from a nominal...
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6867819 |
Digital television receiver and antenna control method therein
A digital television receiver and antenna control method in the digital television receiver are disclosed. The digital television receiver includes and antenna having directivity according to a...
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6567129 |
Color demodulating device
A color demodulation apparatus having color demodulation capabilities as the conventional ones, with its size reduced by sharing part of processing circuit therein is provided. An adder circuit 10...
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6545728 |
Digital television receivers that digitize final I-F signals resulting from triple-conversion
Receiving apparatus for digital television signals digitizes a final intermediate frequency signal supplied from a triple-conversion radio receiver and synchrodynes the digitized final intermediate...
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6522366 |
Dual-loop PLL circuit and chrominance demodulation circuit
A dual-loop PLL circuit is provided with a clamping circuit 12, an A/D conversion circuit 14, a reference color burst outputting circuit 18, a PLL circuit 24, and phase detecting circuit 34. The...
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6433837 |
Demodulator, particularly for a SECAM chrominance signal, with double frequency adjustment
The demodulating device for a chrominance signal includes an oscillator with a controlled frequency, and an adjuster for adjusting the oscillator frequency as a function of a charge voltage of a...
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6400419 |
Television tuner system
In a television tuner system, a printed board is disposed within a frame having a side plate. A tuner and an intermediate frequency circuit are disposed adjacent to each other on the printed board....
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6396548 |
System and method for multimode operation of a digital filter with shared resources
There is disclosed a digital filter cell capable of processing in a first mode a first signal having real data components only and processing in a second mode a second signal having real data...
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6356145 |
Demodulator circuit which demodulates a signal without any restriction from a clock signal
A demodulator circuit including: a signal generating circuit for generating a sine-wave signal and a cosine-wave signal whose frequencies are same as that of the carrier wave of a modulated signal,...
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6313885 |
DTV receiver with baseband equalization filters for QAM signal and for VSB signal which employ common elements
During the reception of VSB DTV signal, the channel equalizer for a QAM/VSB DTV signal receiver the equalizer is operated to equalize only the real sample stream of VSB symbol code, rather than...
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6215528 |
Method and apparatus for digital multi-standard color signal demodulation
The key component of a digital PAL or NTSC color decoder is a quadrature demodulator for these AM modulated signals. For a SECAM color decoder, however, an FM demodulation is required which is...
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6169585 |
Circuit arrangement for demodulating an intermediate-frequency video signal
In a circuit arrangement for demodulating an intermediate-frequency video signal generated while using a Nyquist edge, having a phase-locked loop (1) including a phase detector (3), a loop filter...
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6151080 |
Secam chrominance signal demodulator with two red-blue channels and a single oscillator
The SECAM chrominance signal demodulator includes an oscillator with a controlled frequency, a phase comparator with a first input connected to an oscillator output, a second input to receive a...
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6118498 |
Channel scanning and channel change latency reduction in an ATSC television receiver
A method and apparatus for masking program selection latency in an MPEG-like information stream receiver, such as an ATSC or DVB television receiver. An information stream receiver receives VSB- or...
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6057889 |
Format-responsive video processing system
A video processing system that automatically adjusts video processor parameters depending upon the format of a received video signal in, e.g., a television receiver capable of receiving a...
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5987209 |
Video signal receiver in which a reference signal is shared by a PLL circuit which sets the output frequency of a local RF-IF oscillator and by the chrominance signal generator
A video signal processor which includes a reference signal generating circuit provided with at least an oscillation circuit for generating a reference signal corresponding to a burst signal and a...
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5838395 |
IF demodulator circuit with variable IF gain control
An IF demodulator circuit with IF gain control at a variable time constant, which receives an IF carrier including synchronizing pulses, a black porch and picture information with a positively...
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5815220 |
Color demodulation for digital television
A digital sampling and separation unit (12) for a television receiver (10) of a composite video signal, such as an NTSC signal, which has a color subcarrier. The video signal is sampled at a...
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5703660 |
System and method for decoding a quadrature ampliture modulated signal
A video signal decoder using a sample clock tied to a frequency that is an integer multiple of four times the color subcarrier (4*Fsc). By using a 4*Fsc rate on a given input wave, the decoder...
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5703662 |
Television for storing and displaying still picture
A television for storing and displaying a stored still picture, which includes: a memory for storing a still picture of a desired scene; a decoder for separating a video signal of a broadcast...
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5657090 |
Circuit arrangement for the digital identification of a transmission standard
A circuit arrangement for the digital identification of television transmission standards, particularly PAL, SECAM and NTSC. Provision is made for transmission standard demodulation stages...
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5638140 |
FPLL having AFC filter with limited phase shift
An AFC filter for an FPLL comprises a filter formed of a network of resistors and capacitors exhibiting a predetermined phase response characteristic. The phase response characteristic is limited...
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5635995 |
Dual chrominance signal processor for combined TV/VCR systems
A dual chrominance signal processor is disclosed which may be used in a combination television and video cassette recorder system, for example. Such a chrominance signal processor includes first...
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5526062 |
Color TV receiver using quadrature-phase synchronous detector for supplying signal to chrominance circuitry
In a television system including a source of an intermediate frequency (IF) signal, which signal includes an IF picture carrier amplitude modulated with video information, synchronous demodulator...
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5495203 |
Efficient QAM equalizer/demodulator with non-integer sampling
A QAM demodulator that samples an IF input modulated with data at a fractional complex sampling rate between one and two times the data rate. The use of a fractional sampling rate significantly...
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5477199 |
Digital quadrature amplitude and vestigial sideband modulation decoding method and apparatus
A synchronous detector for demodulating and decoding a digital data signal modulated either according to a vestigial sideband or a quadrature amplitude modulation scheme is based upon the principle...
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5473388 |
PAL chroma signal demodulating apparatus
A signal demodulator apparatus comprises: an input terminal (11) for inputting an external signal; a delay line (12) connected to the input terminal, for outputting a first delay signal obtained by...
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5418575 |
Color display apparatus having compensating unit
A color display apparatus for a video information system includes an input for receiving at least one externally applied color component signal, a display device having predetermined color...
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5359368 |
Demodulating a line locked digital color television signal
A line locked digital color demodulator separates the V and U color components and the burst signal and uses a ROM for providing phase shifts to the V and U demodulation axes. During the burst time...
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5172217 |
Transcoder for spatial manipulation of composite color television signals
The apparatus and method transforms composite video signals according to NTSC, PAL, or SECAM standards into a symmetrical form in which the chroma component is phase locked to the instantaneous...
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5136368 |
Television signal decoder with improved architecture
In a new television signal decoder architecture, a mixer switches between two inputs, A and B, using an envelope function C, according to the relationship: Ouput=A*C+B(1-C), where A is either the...
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5136369 |
Circuit arrangement for identifying the transmission standard of a color television signal
A circuit arrangement for identifying the transmission standard of a color television signal, having a chrominance subcarrier upon which chrominance information is modulated and color synchronising...
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4963831 |
Self adjusting frequency demodulating integrated circuit
Self-adjusting frequency demodulation circuit comprising a frequency demodulator (13) which is designed as an integrated circuit, the adjustment being effected with the aid of a calibration signal...
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4942314 |
Peak holding circuit for a color television receiver
A peak holding circuit comprises a capacitor for holding signal charges corresponding to a peak level of an input signal, and a current amplifier circuit comprising transistors connected in a...
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4870480 |
Subnyquist demodulator as for a television receiver
An asymmetrical sideband modulated (ASM) signal, such as an RF NTSC television signal is demodulated into in-phase and quadrature phase components, each of which are sampled at a sampling rate that...
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4821120 |
Television sub-carrier transmission
In a receiver for the reception of satellite television signals sub-carrier signals carrying, for example, data are recovered from the demodulated television signal and themselves demodulated to...
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4745493 |
Circuit arrangement for a color image recording and reproduction instrument or a color television receiver
A circuit arrangement for a color image recording and reproduction instrument(video recorder) or a color television receiver. Such devices have a phase regulation circuit in which an oscillator...
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4724486 |
Apparatus for deriving information signals for component television video signal reception
Receiving apparatus for receiving multiplexed analogue component signals each of which represents a line of a television picture and includes a burst of digital signals, at least one of the...
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4713689 |
Frequency demodulator for television receiver with time multiplexing
A receiver is provided for a television system which uses time division miplexing (TDM) of analog image signals and of bursts of duobinary coded digital data signals. The digital data signals are...
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