Abstract: Systems and methods for providing a low power receiver device using fine grained time division are provided. In one embodiment, the receiver device comprises a tuner, a demodulator configured to demodulate at least one sampled signal, a payload processor configured to process at least one demodulated signal into an output format, and a time division control logic configured to generate a control signal to switch at least one component within the receiver device between modes to conserve power. The at least one component may be switched between an active mode, a standby mode, a power off mode, and a low power mode. In further embodiments, the at least one component may be switched between staggered modes.

Abstract: For each audio and data service, a table of contents (TOC) specifies which logical channel may carry data. The TOC may be transmitted over the NRSC-5 transmission system using a pre-defined protocol, which is received and decoded at an NRSC-5 receiver apparatus that extracts the TOC. When a user or an application requests a specific service from the receiver, the receiver logic may examine the TOC and may identify which LC may carry the requested service data. The receiver may only decode the LCs that are needed for the requested service, and may not decode other unneeded LCs thereby conserving power and memory.

Abstract: Systems and methods for providing a low power receiver device using fine grained time division are provided. In one embodiment, the receiver device comprises a tuner, a demodulator configured to demodulate at least one sampled signal, a payload processor configured to process at least one demodulated signal into an output format, and a time division control logic configured to generate a control signal to switch at least one component within the receiver device between modes to conserve power. The at least one component may be switched between an active mode, a standby mode, a power off mode, and a low power mode. In further embodiments, the at least one component may be switched between staggered modes.

Abstract: Method and apparatus to determine the channel to which a TV tuner is tuned from a return loss ratio measurement circuit in a set top decoder. The method comprises generating a plurality of probe signals having frequencies spread throughput the TV channel band, preferably using harmonics of a zero order hold D/A converter. The return loss ratio of the reflected probe signals is then determined and stored as a signature for the TV channel and the signatures can subsequently be used along with new return loss ratio measurements to determine the TV channel to which a TV or VCR tuner is tuned.

Abstract: An improved ingress cancellation filter comprising a Fast Fourier Transform circuit which replaces the analysis filter bank of the prior art to break the incoming signal down into sub bands, an ingress cancellation filter that weights each sub band based upon the probability that the sub band is corrupted by noise, and an inverse Fast Fourier Transform circuit to put the weighted sub bands back together into an output signal and replacing the synthesis filter bank of the prior art. Also, an improved predictor filter which can be used with CDMA circuitry by initializing the predictor filter at the beginning of each spreading interval using the samples received on the first L unused codes of the spreading interval.

Abstract: Systems and methods of decoding data streams and conserving power are described. In some embodiments, a stream of data containing audio and other data is divided into a plurality of timeslots. A first timeslot of the plurality of timeslots is allocated to a first service. A grant location message which indicates a location of the first timeslot allocated to the first service is generated. The grant allocation message and the plurality of timeslots are transmitted to a receiver. The receiver may receive and decode the grant allocation message to identify OFDM symbols that carry information regarding the first service. The receiver may also receive the plurality of timeslots. The receiver may set a power mode of a component during OFDM symbols that indicate a status of the first service.

Abstract: An improved ingress cancellation filter comprising a Fast Fourier Transform circuit which replaces the analysis filter bank of the prior art to break the incoming signal down into sub bands, an ingress cancellation filter that weights each sub band based upon the probability that the sub band is corrupted by noise, and an inverse Fast Fourier Transform circuit to put the weighted sub bands back together into an output signal and replacing the synthesis filter bank of the prior art. Also, an improved predictor filter which can be used with CDMA circuitry by initializing the predictor filter at the beginning of each spreading interval using the samples received on the first L unused codes of the spreading interval.

Abstract: Systems and methods for conserving power in a receiver device are provided. In exemplary embodiments, a receiver device comprises a tuner configured to receive a transmitted signal, at least one analog-to-digital converter (ADC), and a digital signal processing hardware comprising a control logic. The exemplary control logic is configured to determine if a symbol within the transmitted signal belongs to an erasure interval, and generate a control signal to configure a receiver device component to conserve power based on the determination.

Abstract: A signal transmitter for sending a radio signal is made up of an input for receiving input data and a first circuit for generating an inphase signal and a quadrature signal from the input data. A second circuit produces a first signal associated with a cosine of a first frequency and a third circuit that produces a second signal associated with a sine of the first frequency. A first modulator, coupled to the first circuit and the second circuit, upconverts the inphase signal with the first signal and produces a first upconverted signal. A second modulator, coupled to the first circuit and the third circuit, upconverts the inphase signal with the second signal and produces a second upconverted signal. A third modulator, coupled to the first circuit and the second circuit, upconverts the quadrature signal with the first signal and produces a third upconverted signal.

Abstract: Systems and methods for dynamically controlling a tuner are provided. In exemplary embodiments, the tuner receives control signals generated by digital signal processing hardware (DSPHW). These control signals control noise figure and linearity characteristic of components within the tuner by adjusting a current supply to those components, according to a desired configuration determined by the DSPHW. As a result, the DSPHW can optimize power consumption of the tuner while allowing for sufficient tuner performance for reliable demodulation of received signals.

Abstract: Systems and methods for providing a low power receiver device using fine grained time division are provided. In one embodiment, the receiver device comprises a tuner, a demodulator configured to demodulate at least one sampled signal, a payload processor configured to process at least one demodulated signal into an output format, and a time division control logic configured to generate a control signal to switch at least one component within the receiver device between modes to conserve power. The at least one component may be switched between an active mode, a standby mode, a power off mode, and a low power mode. In further embodiments, the at least one component may be switched between staggered modes.

Abstract: Systems for improving radio reception on a mobile device are provided. In exemplary embodiments, the system comprises a headset apparatus having a plurality of antenna elements. In exemplary embodiments, the plurality of antenna elements may be positioned in such a manner as to result in low-correlation between the plurality of antenna elements. For example, at least one of the antenna elements may be vertically oriented near a plug of the headset apparatus. Further antenna elements may be oriented vertically, horizontally, or both near an earpiece of the headset apparatus or above a juncture where a left and right cord of the headset apparatus splits. Exemplary embodiments may also comprise a receiving device configured to receive RF signals from the plurality of antenna elements and process these signals for playback on the headset apparatus.

Abstract: An improved ingress cancellation filter comprising a Fast Fourier Transform circuit which replaces the analysis filter bank of the prior art to break the incoming signal down into sub bands, an ingress cancellation filter that weights each sub band based upon the probability that the sub band is corrupted by noise, and an inverse Fast Fourier Transform circuit to put the weighted sub bands back together into an output signal and replacing the synthesis filter bank of the prior art. Also, an improved predictor filter which can be used with CDMA circuitry by initializing the predictor filter at the beginning of each spreading interval using the samples received on the first L unused codes of the spreading interval.

Abstract: A signal transmitter for sending a radio signal is made up of an input for receiving input data and a first circuit for generating an inphase signal and a quadrature signal from the input data. A second circuit produces a first signal associated with a cosine of a first frequency and a third circuit that produces a second signal associated with a sine of the first frequency. A first modulator, coupled to the first circuit and the second circuit, upconverts the inphase signal with the first signal and produces a first upconverted signal. A second modulator, coupled to the first circuit and the third circuit, upconverts the inphase signal with the second signal and produces a second upconverted signal. A third modulator, coupled to the first circuit and the second circuit, upconverts the quadrature signal with the first signal and produces a third upconverted signal.

Abstract: Method and apparatus to determine the channel to which a TV tuner is tuned from a return loss ratio measurement circuit in a set top decoder. The method comprises generating a plurality of probe signals having frequencies spread throughut the TV channel band, preferably using harmonics of a zero order hold D/A converter. The return loss ratio of the reflected probe signals is then determined and stored as a signature for the TV channel and the signatures can subsequently be used along with new return loss ratio measurements to determine the TV channel to which a TV or VCR tuner is tuned.

Abstract: A system for outputting a broadband signal outputs a number of input channel streams. The input channel streams first arrive at the system in a digital format. There the input channel streams are each directed to a modulator circuit. Each particular modulator circuit produces a digital upconverted signal for the associated channel streams. The outputs of the modulators are coupled to a summer circuit. Accordingly the summer circuit digitally sums the outputs of the modulator circuits. The summer circuit is coupled to a digital to analog converter (DAC). The DAC produces an analog signal from the digitally summed output of the summer circuit. The DAC is in turn coupled to an upconverter. The upconverter upconverts the analog output of the DAC into an output signal centered on a particular frequency.

Abstract: A method of calculating TEQ and FEQ coefficients in a discrete multi-tone (DMT) system includes determining an estimated channel impulse response. A frame delay is determined based upon the estimated channel impulse response. Using these parameters and a known training sequence, the method generates the TEQ coefficients. The method then generates the FEQ coefficients based upon the TEQ coefficients and a version of the estimated channel impulse response.