46 results about "SECAM" patented technology

A video, audio and graphics system uses multiple transport processors to receive in-band and out-of-band MPEG Transport streams, to perform PID and section filtering as well as DVB and DES decryption and to de-multiplex them. The system processes the PES into digital audio, MPEG video and message data. The system is capable of decoding multiple MPEG SLICEs concurrently. Graphics windows are blended in parallel, and blended with video using alpha blending. During graphics processing, a single-port SRAM is used equivalently as a dual-port SRAM. The video may include both analog video, e.g., NTSC / PAL / SECAM / S-video, and digital video, e.g., MPEG-2 video in SDTV or HDTV format. The system has a reduced memory mode in which video images are reduced in half in horizontal direction only during decoding. The system is capable of receiving and processing digital audio signals such as MPEG Layer 1 and Layer 2 audio and Dolby AC-3 audio, as well as PCM audio signals. The system includes a memory controller. The system includes a system bridge controller to interface a CPU with devices internal to the system as well as peripheral devices including PCI devices and I / O devices such as RAM, ROM and flash memory devices. The system is capable of displaying video and graphics in both the high definition (HD) mode and the standard definition (SD) mode. The system may output an HDTV video while converting the HDTV video and providing as another output having an SDTV format or another HDTV format.

A video and graphics system processes video data including both analog video, e.g., NTSC / PAL / SECAM / S-video, and digital video, e.g., MPEG-2 video in SDTV or HDTV format. The video and graphics system includes a video decoder, which is capable of concurrently decoding multiple SLICEs of MPEG-2 video data. The video decoder includes multiple row decoding engines for decoding the MPEG-2 video data. Each row decoding engine concurrently decodes two or more rows of the MPEG-2 video data. The row decoding engines have a pipelined architecture for concurrently decoding multiple rows of MPEG-2 video data. The video decoder may be integrated on an integrated circuit chip with other video and graphics system components such as transport processors for receiving one or more compressed data streams and for extracting video data, and a video compositor for blending processed video data with graphics.

A video, audio and graphics system uses multiple transport processors to receive in-band and out-of-band MPEG Transport streams, to perform PID and section filtering as well as DVB and DES decryption and to de-multiplex them. The system processes the PES into digital audio, MPEG video and message data. The system is capable of decoding multiple MPEG SLICEs concurrently. Graphics windows are blended in parallel, and blended with video using alpha blending. During graphics processing, a single-port SRAM is used equivalently as a dual-port SRAM. The video may include both analog video, e.g., NTSC / PAL / SECAM / S-video, and digital video, e.g., MPEG-2 video in SDTV or HDTV format. The system has a reduced memory mode in which video images are reduced in half in horizontal direction only during decoding. The system is capable of receiving and processing digital audio signals such as MPEG Layer 1 and Layer 2 audio and Dolby AC-3 audio, as well as PCM audio signals. The system includes a memory controller. The system includes a system bridge controller to interface a CPU with devices internal to the system as well as peripheral devices including PCI devices and I / O devices such as RAM, ROM and flash memory devices. The system is capable of displaying video and graphics in both the high definition (HD) mode and the standard definition (SD) mode. The system may output an HDTV video while converting the HDTV video and providing as another output having an SDTV format or another HDTV format.

An audio / video production system facilitates professional quality image manipulation and editing using an enhanced general-purpose hardware. A program input may be translated into any of a variety of graphics or television formats, including NTSC, PAL, SECAM and HDTV, and stored as data-compressed images, using any of several commercially available methods such as Motion JPEG, MPEG, etc. While being processed, the images may be re-sized to produce a desired aspect ratio or dimensions using conventional techniques such as pixel interpolation. Frame rate conversion to and from conventional formats is performed by using the techniques employed for film-to-NTSC and film-to-PAL transfers, or by inter-frame interpolation, all well known in the art. By judicious selection of the optimal digitizing parameters, the system allows a user to establish an interrelated family of aspect ratios, resolutions, and frame rates, yet remain compatible with currently available and planned graphics and television formats.

Provided are decoding methods and decoders for separating luminance and chrominance components of a video signal. In one aspect, a reference subcarrier of a first line of the video signal is used for subsequent lines by applying an appropriate rotation to the reference subcarrier of the first line for each subsequent line. In another aspect, comb filtering is adaptively controlled based on determining whether 90 or 180 degrees relationship is maintained from line to line. In a further aspect, both complimentary and non-complimentary comb filtering are implemented. In yet another aspect, SECAM bell filtering is achieved by rotating the video signal to obtain a baseband signal, low-pass filtering and modulating the baseband signal, and subtracting the modulated low-pass filtered baseband signal from the video signal to notch the chroma component from the luma component.

A SECAM video signal is decoded by selecting different combinations of chrominance signals according to the luminance difference between the current line and the preceding line. The chrominance signals from the current line and the preceding line are selected when this difference is smaller than a threshold. The chrominance signals from the current line and the next line are selected when the difference is greater than the threshold. The average value of the chrominance signals in the preceding and following lines may be calculated and selected in place of the chrominance signal from the preceding line.

The invention discloses a digital television set top box based on LED visible light communication, belonging to the field of digital television set top boxes and comprising a digital tuner, a quadrature amplitude modulation (QAM) and demodulation module, an ATM (Asynchronous Transfer Mode) processing unit, an MPEG (Moving Picture Experts Group)-2 video and audio decoder, an audio digital analogy (D / A) conversion unit, a PAL / NTSC / SECAM (Programmable Array Logic / National Television System Committee / Sequential Colour and Memory) decoder and an optical receiver; and an LED visible light communication technology is applied to the digital television set top box so that the wireless communication between a television program signal and the set top box is realized. In such a way, a television signal can be input to the digital television set top box in a wireless way so as to be decoded and output; and the digital television set top box based on LED visible light communication has the advantages of simple structure, higher image definition and better practicability.

We describe an apparatus and method for decoding a SECAM chrominance signal. The apparatus may include a band-pass filter to separate the chrominance signal from the composite video baseband signal. A down-mixer down mixes the chrominance signal from a high to a low frequency band to generate two signals having a substantially 90° phase difference. A cloche filter filters the two signals. A differentiator differentiates the cloche filtered signals. A multiplier squares each differentiated signal. An adder sums the squared result while a square root takes the square root of the sum.

A camera apparatus having a digital image processing function for an analog transmission network is provided. The camera apparatus divides each of frames of first resolution digital image data into N equal regions, converting each frame of the digital image data into N fields by interlacing the regions in order of region numbers, and transmitting the N fields through the analog transmission network. High resolution image data of HDTV class created by the camera apparatus can be reproduced on an image display apparatus by using analog transmission networks laid for transmitting analog image data conforming to the analog NTSC, PAL, or SECAM standard without any change.

In a receiver capable of receiving a plurality of television systems, a color transmission system discrimination circuit is provided, which is capable of exactly and rapidly determining a color transmission system which is being received. The color transmission system discrimination circuit includes: a killer state change detection circuit 23 for detecting a change in three kinds of color killer signals corresponding to a burst signal component in a 90° phase, a burst signal component in a 180° phase, and a SECAM discrimination signal; a sequencer 22 which is driven with an output signal of the killer state change detection circuit 23 and performs the first, second, and third stages in this order respectively for a predetermined period of time; first latch circuits 29 to 31 for latching the color killer signal captured in the first stage; second latch circuits 32 and 33 for latching the color killer signal captured in the second stage; and a discrimination decoder 34 for outputting a discrimination signal of a color system and a discrimination signal of a frequency of a reference sub-carrier signal, based on the color killer signal captured in the third stage and the output signals of the first and second latch circuits 29 to 33.

The method comprises: using FM ratio demodulation circuit to demodulate the current row-scan-line color sync signals; according to the demodulation result, getting the frequency of current row-scan-line color sync signals; getting the intermediate frequency between the subcarrier corresponding to the red color difference signal and the subcarrier corresponding to the blue color difference signal; comparing the frequency of current row-scan-line color sync signal with said intermediate frequency; according to the comparison result, determining the type of current row-scan-line subcarrier. The invention also reveals an apparatus thereof.

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 counter to determine a number of clock cycles between zero crossings. The resolution of this coarse period determination is further refined by an intercept calculation, which further localizes the zero crossing of the FM waveform based on interpolation between samples on either side of the zero crossing. Accuracy of the period determination may be further enhanced by use of a sinusoidal correction filter, which minimizes error caused by the linear interpolation performed on the sinusoidal waveform. Although the FM demodulator circuit is particularly suitable for demodulation of the chroma component of a SECAM video signal, it may advantageously be applied in a wide variety of FM demodulation applications.

An apparatus for recovering a chrominance signal from a sequential color with memory (SECAM) composite video baseband signal (CVBS), and more particularly, an apparatus and method of recovering a SECAM chrominance signal to simplify a circuit configuration of a frequency demodulator since a phase different calculation scheme is simplified is provided. The apparatus for recovering a chrominance signal from a CVBS includes: a frequency demodulator calculating a phase difference between neighboring samples by using an arctangent approximation from an input signal; and a direct current (DC) compensation unit eliminating a DC offset from the calculated phase difference, wherein the phase difference corresponds to the chrominance signal.

This invention discloses a method for testing sub-carrier kind of SECAM video signals including: obtaining mean values of amplitudes of chromatic synchronous signals of the last line and the current line, comparing the values of the mean values of the current line with that of the last to decide the sub-carrier kind of the current line based on the result. This invention also discloses a test device.

We describe an apparatus and method for decoding a SECAM chrominance signal. The apparatus may include a band-pass filter to separate the chrominance signal from the composite video baseband signal. A down-mixer down mixes the chrominance signal from a high to a low frequency band to generate two signals having a substantially 90° phase difference. A cloche filter filters the two signals. A differentiator differentiates the cloche filtered signals. A multiplier squares each differentiated signal. An adder sums the squared result while a square root takes the square root of the sum.

The invention provides a television broadcasting signal receiving tuner which is impossible to lower the basic property by corresponding to a PAL mode and SECAM-L mode on a VHF low-frequency band. A television broadcasting signal receiving tuner (1) which can receive a PAL mode and SECAM-L mode television broadcasting signal is provided with a first tuning circuit (11), a second tuning circuit (12) and a RF tuning circuit (4), wherein the RF tuning circuit (4) has a coupling inductor (L5) for adjusting the coupling degree between the first and second tuning circuits (11) and (12). Under the action of the RF tuning circuit (4), the coupling degree of the coupling inductor when the SECAM-L mode television broadcasting signal on the VHF low-frequency band is received is smaller than the coupling degree of the coupling inductor when the PAL mode television broadcasting signal is received.

An apparatus for recovering a chrominance signal from a sequential color with memory (SECAM) composite video baseband signal (CVBS), and more particularly, to a frequency demodulator and method of recovering a SECAM chrominance signal which can utilize both a real number portion and an imaginary number portion, and generate a frequency-demodulated chrominance signal using an arctangent approximation, and thereby can simplify a circuit configuration of a frequency demodulator to perform a fixed-point calculation is provided. A frequency demodulator for recovering a chrominance signal, the frequency demodulator comprises a phase differentiator generating a phase difference component between neighboring samples from an input signal and a phase estimator calculating a phase difference between the neighboring samples by using an arctangent approximation, based on the generated phase difference component, wherein the frequency demodulator generates a frequency-demodulated chrominance signal and the phase difference corresponds to the chrominance signal.

A picture signal processing circuit capable of processing picture signals of various broadcast systems including the SECAM system, the PAL system and the NTSC system, wherein an FM demodulation circuit for demodulating a SECAM signal is used also as a portion of a burst frequency discrimination circuit. An input picture signal is demodulated by the FM demodulation circuit to obtain a frequency component thereof, and then a burst signal portion thereof is extracted by a burst extracting circuit. The extracted demodulated signal is integrated by an integration circuit, and compared with a predetermined value by a comparator, based on which the burst frequency is determined. Therefore, it is possible to instantaneously determine the burst frequency, and the circuit scale is reduced by sharing the FM demodulation circuit.

A video signal processing circuit. includes: a bell table, a first switch, a carrier generating unit, a second switch and a calculation processing unit. The bell table inputs a color difference signal to output a modulation signal having an amplitude defined by the SECAM Standard of the color difference signal. The first switch selects one of the color difference signal and the modulation signal to output a first signal. The carrier generating unit inputs the color difference signal to generate a carrier signal having a frequency defined by the SECAM Standard of the color difference signal. The second switch selects one of the carrier signal and a carrier signal having frequency defined by the PAL Standard and / or the NTSC Standard to output a second signal. The calculation processing unit calculates the first and second signals to output a color difference modulation signal.

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 memory capacitor. The adjuster preferably includes a fine adjustment channel to output a first adjustment value that depends on the charge voltage of the memory capacitor, and a coarse adjustment channel to output a second adjustment value. The second adjustment value is modified when the charge voltage of the memory capacitor is not within a given range. The device is used, for example, in integrated SECAM decoders.

The invention discloses a streaming media playing method based on a DireotShow platform, which comprises the following steps of: selection of a video system, in which a system of a video stream input source is identified, the identified system is compared with a system of an initial input source, an equipment controller stops working if the system has been changed, equipment parameters are modified to ensure that the system is the same as that of the corresponding input source, and video steam continues to be transmitted according to the modified system standard; and selection of a sound system, in which an original sound is produced according to each country code with a PAL or SECAM system during channel scanning, each original sound corresponds to a frequency, a plurality of the sounds and a plurality of the frequencies form a channel list, whether the system of the video stream input source is the PAL or SECAM system is judged, if so, the sound corresponding to the frequency which corresponds to the country code is read from the channel list according to the country code corresponding to the video stream input source, and is sent to a current equipment drive, and corresponding audio is modulated by current equipment.

A channel selection apparatus is provided for allowing receipt of signals broadcast according to the NTSC, SECAM and PAL broadcast modes. A controller discriminates the signal's broadcast mode based on the horizontal sync signal included in the received signal and alters a circuit connection path. Accordingly, a desired broadcast mode can be automatically selected without requiring any particular switch manipulation by a user. Further, a video signal processing path is separated from a sound signal processing path, in order to obtain excellent sound quality, even when receiving a stereo broadcast. Also, it is possible to easily automate the manufacturing process for the apparatus, thereby improving productivity.

When a video signal type detection section detects a video signal of the PAL method or the SECAM method (50Hz), it subjects the input image data to emphasis conversion processing with a smaller emphasis conversion degree than the NTSC method (60Hz), thereby improving the liquid crystal response speed, preventing generation of a video noise by excessive emphasis, and suppressing the image deterioration. As a result, it is possible to perform emphasis conversion for the input image data so as to compensate the optical response characteristic of the liquid crystal display panel and to prevent generation of a video noise by an excessive emphasis conversion for the image data of the PAL method or the SECAM method (50 Hz), thereby displaying a high-quality image.

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 conventionally implemented using a Hilbert filter which is followed by a CORDIC processor and a differentiation stage. It would be advantageous if for multi-standard applications a general-purpose color demodulator for PAL, NTSC and SECAM systems could be implemented on one chip having as much as possible common demodulation processing stages. According to the invention a single common quadrature mixer is used for all three color systems. A resulting bias effect caused by the use of a single mixing frequency is corrected in a clamping stage. The bias effect can also be used for line identification.

The invention provides a system for reconstructing chroma of a television signal, a brightness chroma separation and color decoding device in the system generates brightness and color difference corresponding to a Kth pixel in the (N+1)th image line via filtration of the television signal. A first line buffer device temporarily stores the brightness of the Kth pixel in at least one adjacent image line prior to the (N+1)th image line. A second line buffer device temporarily stores the color difference of the Kth pixel in the Nth and the (N-1)th image line. A vertical direction similarity calculation device generates, in accordance with the brightness corresponding to the Kth pixel in the (N+1)th image line and the (N-1)th image line, an upper similar parameter and a lower similar parameter. The reconstruction device implements weighting to color difference signals of the (N+1)th image line and the (N-1)th image line by taking the upper similar parameter and the lower similar parameter as weights, so as to obtain a reconstruction color difference signal of the Kth pixel in the Nth image line. The invention also provides a method for reconstructing chroma of a television signal, the color difference signal can be reconstructed precisely in a SECAM television system using the invention.

The invention relates to a method for processing the color difference of an SECAM digital video frequency decoder. In order to obtain stable image data from the SECAM digital video frequency decoder, the processing method comprises the following steps: a first delay unit (12), leading a color signal Cr (n+1) demodulated by means of a color demodulation signal of an SECAM way to delay 1H so as to obtain the color signal Cb (n); a second delay unit (13), leading the color signal Cb (n) to further delay the 1H so as to obtain the color signal Cr (n-1); a third delay unit(16), leading brightness data Y (n+1) to delay the 1H so as to obtain a brightness signal Y (n); brightness difference decision unit (17), comparing and delaying the brightness signal Y (n) and the Y (n+1), outputting the signal corresponding to the brightness difference, and choosing and outputting two random signals of the Cr (n+1), the Cb (n) and the Cr (n-1) according to the signal corresponding to the brightness difference.

The embodiment of the invention discloses an SECAM (Sequential Colour and Memory) system detection method which comprises the following steps of: inputting video signals line by line; setting a window in a color synchronization signal area of each line of video signals, and grouping every six adjacent lines of video signals as one; in the window area, adding data of every two lines of odd-numbered lines or even-numbered lines in each group to obtain three sum values, judging whether the amplitude of the three sum values satisfies two small values and one big value, voting for the satisfaction condition of the three sum values, judging whether one value is larger than the other two in three voting values M1, M2 and M3 and the difference of the other two is larger than a set threshold value, if yes, the current system is an SECAM system. The invention further discloses a corresponding SECAM system detection device. The method and device disclosed by the invention are simpler and can be realized conveniently.