Abstract: A traffic condition prediction system and a traffic condition prediction method are disclosed. The method includes: determining a center of circle in a surveillance image of a target traffic scene; determining a first circle based on the center of circle and a first radius; extracting a plurality of first feature points along the circumference of the first circle according to a first preset sampling frequency; generating a scene feature of the target traffic scene at least based on the first feature points; determining whether the scene feature and a scene feature of another traffic scene are similar; and when determining that they are similar, predicting traffic condition of the target traffic scene through a prediction model used for predicting traffic condition of the other traffic scene. The scene feature of the target traffic scene and that of the other traffic scene are generated in a same way.

Abstract: Techniques are provide herein to determine the amount of allocated and unutilized bandwidth for services already provided on each of a plurality of quadrature amplitude modulator (QAM) channels. One of the plurality of QAM channels is selected as a selected QAM channel to maximize capacity for future service requests based on a determination that the selected QAM channel can have bandwidth deallocated to support a service at a second bandwidth greater than a first bandwidth. A sufficient amount of the allocated and unutilized bandwidth is deallocated for services provided at the first bandwidth on the selected QAM channel such that the service at the second bandwidth is thereafter supportable on the selected QAM.

Abstract: In a VIF circuit for synchronously detecting a picture signal from an AM-modulated PIF signal, the accuracy of a picture signal to be demodulated is maintained even in a state of overmodulation. A comparator (68) determines whether the picture signal exceeds VTH, which is a state of overmodulation. In a period in which the signal is less than or equal to VTH, a switch circuit (56) inputs an output voltage of an APC filter (54) to a VCO (48), and a PLL is formed. The PLL operates so as to lock onto the PIF signal, and reproduces a carrier wave. On the other hand, in a period in which the signal exceeds VTH, the switch circuit (56) inputs an output voltage VSH of an SH circuit (58) to the VCO (48). The SH circuit (58) holds the voltage of the APC filter (54) that is in a locked state in a horizontal synchronizing period and uses the voltage to control the VCO (48), whereby free run and frequency drifting are minimized.

Abstract: Systems and methods for demodulating signals are disclosed. A system in accordance with the present invention comprises a frequency estimator, a tuner, coupled to the frequency estimator, for tuning to a frequency based on an estimate from the frequency estimator, a phase offset estimator for determining an average phase offset, and a demodulator, coupled to the tuner and the phase offset estimator, for demodulating the plurality of symbols, wherein the demodulator corrects a phase offset for a given symbol in the plurality of the symbols based on the average phase offset of symbols prior to the given symbol.

Abstract: A triax transmitter interface for transmitting a video signal on a triax cable comprises a video signal input port, a first modulator for modulating a luminance component of a video signal received at said input port onto a first carrier and a second modulator for modulating a chrominance component of the video signal onto a second carrier, and a triax output port for outputting said modulated carriers to a triax cable. The first modulator is a quadrature modulator adapted to modulate luminance components of two video image lines simultaneously and in quadrature onto said first carrier. A receiver interface has a quadrature demodulator for restoring the luminance component.

Abstract: In a digital TV receiver a single digital complex multiplier is used for digitally synchrodyning digital intermediate-frequency signal to baseband both during the reception of VSB digital television signals and during the reception of QAM digital television signals. The component digital multipliers of the complex multiplier are provided by read-only memories (ROMs). The complex digital carriers used by the complex multiplier are supplied from further read-only memory storing sine/cosine look-up tables for the QAM carrier and for the VSB carrier as,translated to the final intermediate-frequency band. This further read-only memory is addressed by a sample count and an indication of whether VSB or QAM digital television signal is currently being received.

Abstract: The present invention relates to a method and system for transmitting digital data within an analog TV signal. Digital data are received from a data source. The digital data are then multilevel encoded and a plurality of data symbols in dependence thereupon is provided. Each of the plurality of data symbols is modulated in frequency domain onto a carrier of a plurality of carriers such that each carrier carries a different data symbol. The modulation step is based on an OFDM method and is performed using a serial to parallel converter. After modulation a digital data signal is provided. Some carriers of the plurality of carriers are turned off in the modulation process in order to shape the spectrum of the digital data signal such that the spectrum of the digital data signal comprises notches at locations coinciding with locations of spectral components in the vestigial sideband of the video carrier of the analog TV signal.

Abstract: Normally ordered robust VSB data are reordered in accordance with a first interleave to produce reordered robust VSB data, The reordered robust VSB data and ATSC data are reordered in accordance with a second interleave to produce normally ordered robust VSB data and reordered ATSC data. The normally ordered robust VSB data and reordered ATSC data are time multiplexed for transmission to a receiver. The receiver discards the reordered ATSC data or the normally ordered robust VSB data depending upon receiver type or user selection. A robust VSB receiver is able to process the normally ordered robust VSB data upstream of an outer decoder without an interleave thereby avoiding the delay associated with an interleave.

Abstract: A receiver receives a digital signal. The digital signal contains a frame of robust VSB data and ATSC data, and the digital signal further contains a map. The map contains information indicating a location of the robust VSB data and ATSC data in the frame. A decoder of the receiver decodes the digital signal. A processor of the receiver processes at least one of the robust VSB data and the ATSC data according to the location information contained in the map.