282 results about "Digital channel" patented technology

A satellite positioning system (SATPS) receiver has a mix of standard and enhanced digital channel processors. The standard digital channel processors perform continuous tracking. During a low SNR and/or fast acquisition mode, the enhanced digital channel processor accumulates samples of a SATPS signal that are identically positioned within corresponding PRN code repetition periods, and plays back the stored accumulated values of the samples in an integration period to a correlation section for correlation with a locally generated PRN code.

A system for providing broadcasting services is disclosed. The system includes a digital channel database for storing a program from a broadcaster; a computer network for accessing and distributing the program as a data stream; a tower controller for receiving the program data stream from the computer network; and at least one transmitter selected by the tower controller to receive the data stream and to broadcast the program to end-user receivers.

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 starting frequency; adding a predetermined scan step to said search frequency if the first available channel is not found at the starting frequency, and adding additional predetermined scan steps to the search frequency until the first available channel is found if the first available channels is not found at the starting frequency plus the scan step; and (c) searching for a second available digital channel by searching at a first main frequency, which is the first available channel frequency plus a first predetermined bandwidth, wherein the step of searching for the second available digital channel includes searching at a plurality of scan steps around the first main frequency.

A system and a method for delivering targeted advertisements to the set-top box (STB). The targeted advertisements may be delivered to the STB in a low bandwidth channel or in a high bandwidth channel as an ad channel. The ad channel may be an analog channel wherein the advertisements are transmitted as analog video. Alternatively, the advertisement channel may be a digital channel, and the advertisements may be encoded and transported in the same way as conventional programming. In digital cases, a 6 MHz digital channel may carry several digital advertisement channels. Moreover, other services (e.g., data may be carried within the 6 MHz digital channel). Alternatively, the ad channel may share a 6 MHz bandwidth with one or more other programming channels.

Various embodiments of the invention provide apparatus, methods, and systems for effectuating an increase in the effective bandwidth of a cable television distribution plant in a manner compatible with most common cable television systems. By using methods and systems for simultaneously transmitting a standard analog television signal and a digital data signal in a manner that minimizes interference of each with the other, one or more data carriers may be embedded within one or more analog television channels in accordance with various aspects of the present invention. These combined signals can be transmitted transparently over the existing cable television distribution plant to a location at or near the subscribers so that, among other things, that the subscriber may "pause and resume" much in the way Personal Video Recorders work.

A receiver for a resonance signal of a magnetic resonance imaging system generates a baseband signal for image processing by dividing a raw resonance signal among multiple parallel channels, each amplified at a respective gain. A digital channel selector determines, at any given moment, a lowest-distortion channel to be further processed. Amplitude and phase error compensation are handled digitally using complex multipliers, which are derived by a calibration, based on a simple Larmor oscillator, which can be done without the need for a sample and without repeating when measurement conditions are changed. One of the important benefits of the invention is that it provides for gain selection without repeated calibration steps. This is particularly important in systems that employ fast imaging techniques such as fast spin echo, where the invention can speed imaging substantially.

Content used in creating an electronic program guide and/or channels for a television reception system is delivered to a local receiving device, such as a direct to home satellite receiver, as individual digital objects. Rules (i.e., conditional expressions) may be embedded in the digital objects to allow different actions in different situations. These rules can be used to determine whether an object should be stored, which objects should be included in an electronic program guide, and/or what content should be used to create a particular channel.

Disclosed is a system and method for processing signals received from different global navigation satellite systems. The receiver includes a number of universal digital channels. The universal digital channel can be used to receive and process different code signals of each of the three navigation satellite systems GPS, GLONASS, and GALILEO. The universal digital channels have the same structure. Each of them can be tuned to receive different signals. The core of the universal digital channel is a code generator and a universal strobe generator.

We present a communication system which enables two or more parties to secretly communicate through an existing digital channel which has a primary function other than this secret communication. A first party receives a series of cover data sets, hides a certain amount of auxiliary data in the cover data sets, and then relays these cover data sets containing hidden data to a second party, aware of the hidden data. This second party may then extract the hidden data and either restore it to its original state (the state it was in before the first party received it) and send it along to its original intended destination, or may just simply extract the hidden auxiliary data. There exist a plethora of techniques for hiding auxiliary data in cover data, and any of these can be used for the hiding phase of the system. For example, in a JPEG cover data set, a Huffman table may be modified in such a way as to have no impact on the observable nature of the image, and several such schemes are presented here. Since there are so many ways in which to exploit a particular cover data set for secret communication, it is necessary that the first and second parties have pre-established a set of rules by which they will communicate. There must be agreement on the hiding technique, cover data type and location of the hidden data within the cover.

A method of tagging signals for leakage detection and measurement in cable television networks which uses additional signals carrying the tagging information and transmitted in these networks. A narrowband tagging signal or signals are placed in the unused frequency spectrum parts of any used cable television channel, in particular in the guard bands (GB) of analog or digital channels, carrying, for example, television, radio or data services.

The invention provides a wide-range high-precision matched digital channel three-dimensional visualization method. For a scene graph technology-based channel scene organization method and an incremental component-based similar model modeling method, a wide-range channel terrain which accords with earth curvature change and is completely matched with an electronic chart is established, a k-crossing tree structure scene graph of a channel scene three-dimensional entity model is established, and the channel scene three-dimensional entity model which has the characteristics of wide ranges of three dimension, dynamic and scene, irregular entity and the like is organized, expressed, multiplexed and parallelly quickly developed; and based on a dynamic data configuration technology, a database paging scheduling policy is combined, and the wide-range channel three-dimensional entity model is subjected to high-precision matching, dynamic management and real-time smooth drawing. By the method, wide-range channel high-precision and high-efficiency three-dimensional visualization is realized, and inland water transportation boatmanship training and the visualization construction of Yangtze River digital channels are promoted.

A system and method are disclosed for performing digital multi-channel decoding of a BTSC composite audio signal. Analog-to-digital conversion is performed on a composite analog audio signal at a fast clock rate to generate a composite digital audio signal at a first sample rate. Digital frequency compensation is performed on the composite digital audio signal at the first sample rate to generate a compensated composite audio signal. Digital channel demodulation and filtering are performed on the compensated composite audio signal at the first sample rate to generate a first single channel audio signal at a second sample rate.

The invention relates to a digital loudspeaker drive method and a device based on quaternary code dynamic mismatch reshaping. The method comprises the steps of (1) conducting input format conversion, (2) conducting multi-bit sigma to delta modulation, (3) conducting thermometer code conversion, (4) conducting dynamic mismatch reshaping processing, (5) conducting channel data combination and mapping coding, (6) controlling metal-oxide-semiconductor field effect transistor (MOSFET) pipe of a full-bridge power amplifier network to conduct opening and closing status switching, and driving a digitalized loudspeaker load to produce sound. The device comprises a sound source (1), a digital format converter (2), a multi-bit sigma to delta modulator (3), a thermometer coder (4), a dynamic mismatch reshaper (5), a channel data combiner (6), a mapping coder (7), a multi-channel digital amplifier (8) and the digitalized loudspeaker load (9). The units are sequentially connected in order. According to the digital loudspeaker drive method and the device based on quaternary code dynamic mismatch reshaping, use efficiency of an amplifier pipe and the load is improved, development periods and hardware implementation cost are saved, and good immunity is provided for frequency response deviation of digital channels.

The invention discloses a digital channel switching method comprising the following steps: video data provided by a channel next to a playing channel is received, and video data of at least one video data internal frame in the channel next to the playing channel is stored in a pre-buffer; and when the playing channel is switched for the next channel, the video data of at least one video data internal frame in the channel next to the playing channel is removed from the pre-buffer, and is decoded for playing. Meanwhile, the invention further discloses a digital video processing device. By adopting the method and the digital video processing device which are provided by the invention, the purpose of saving the time of establishing conversation with a network-side television server, standing by for the release of coded data and waiting for the internal frame can be achieved while switching channels, so that the invention can achieve the effects of accelerating the channel switching speed and improving of the comfort level of a user's experience.

A method of enhancing the tonal and chrominance characteristics of a digital image, includes receiving a source digital image including wherein the source digital image is in a luminance-chrominance representation having a luminance digital image channel and at least two chrominance digital image channels; producing a tone scale function that can be used to enhance the tonal characteristics of the source digital image; classifying the tone scale function into one of two or more categories based on the effect the tone scale function will have on the numerical range of pixel values of a processed digital image wherein the classification categories include expansive and compressive; using the tone scale function and the luminance digital image channel to produce an enhanced luminance digital image channel; and amplifying the chrominance digital image channels to produce modified chrominance digital channels when the tone scale function has been classified as expansive.

An image display apparatus equipped with an analog tuner and a digital tuner includes a key input unit for enabling a user to input an automatic channel scan command and other requests; a controller for conducting channel scan in response to the automatic channel scan command inputted through the key input unit, the channel scan first being conducted on analog channels and then digital channels by using the analog tuner and the digital tuner, or first being conducted on digital channels and then analog channels by using the digital tuner and the analog tuner, wherein the comparison of the number of channels scanned first with a predetermined number of channels determines a channel scan method; and a memory for storing analog channels/digital channels being automatically scanned.

An accurate bandwidth provisioning tool for Internet Service Providers, for both Voice over IP and data traffic, which is able to predict the demand for network resources based on the network traffic characteristics and the number of subscribers after taking into account subscriber growth and other relevant factors. To predict the demand, the tool uses a Gaussian model for Voice traffic, and a Gamma model, or alternatively, a dimensioning formula, for data traffic. The tool also discloses a method of planning Cable television network capacity when converting analog channels to digital channels.

Systems and methods which provide a multimode tuner architecture implementing direct frequency conversion are shown. Embodiments provide a highly integrated configuration wherein low noise amplifier, tuner, analog and digital channel filter, and analog demodulator functionality are provided in a single integrated circuit. A LNA of embodiments implements a multi-path configuration with seamless switching to provide desired gain control while meeting noise and linearity design parameters. Embodiments of the invention implement in-phase and quadrature (IQ) equalization and a multimode channelization filter architecture to facilitate the use of direct frequency conversion. Embodiments implement spur avoidance techniques for improving tuner system operation and output using a clock signal generation architecture in which a system clock, sampling clock frequencies, local oscillator (LO) reference clock frequencies, and/or the like are dynamically movable.

An apparatus comprising a tuner module configured to demodulate a first television signal and a second television signal that corresponds to the first television signal; and a controller electronically coupled to the tuner module, the controller configured to compare a value of a first variable to a threshold level, the value of the first variable related to a quality of the first television signal; wherein the controller switches from outputting for display the first television signal to outputting for display the second television signal that corresponds to the first television signal in response to comparing the value of the first variable to the threshold level.

The invention is directed to a digital phase detector that comprises a splitter and phase shifter to receive a signal of a device under test and produce a first signal that is substantially identical to the received signal and a second signal that is phase shifted relative to the first signal. A first analog-to-digital channel processes the first signal to produce an in-phase and quadrature signals. The second signal is processed by a second analog-to-digital channel to produce a second set of in-phase and quadrature signals. The two sets of in-phase and quadrature signals are used to determine a phase difference between the signal of the device under test and a local oscillator signal associated with the two analog-to-digital channels. The invention is further directed to a direct digital synthesizer that is capable of use within the digital phase detector and in other applications. The direct digital synthesizer comprises a sine look-up table or calculator that provides a digital signal representative of the amplitude of a sine wave at an angle of 2πkJ/M where J is an integer number of cycles of the sine wave, M is an integer number of sine wave data values that represent J cycles of the sine wave, and k is an integer number having a value in a range extending from 1 to and including M. By appropriately selecting the value of M, certain spur related issues can be avoided. Further, appropriate selection of J and M allows the synthesizer to generate frequencies that are rational fractions of the frequency of a clock applied to the synthesizer.