Abstract: Disclosed is a low power consumption GNSS receiver by adaptively adjusting clock frequency. A correlator performs correlations to signals received from the channels with a correlator clock frequency. A DSP controls the correlator clock frequency according to a correlator load to performing correlations. The DSP calculates and adjusts code phases and Doppler frequencies for the signals in turn with a DSP clock frequency. The DSP controls the DSP clock frequency according to an accumulated throughput of calculation and adjustment or a predetermined threshold number of channels. The DSP controls the RF power according to the correlator load. A microprocessor processes a measurement result of the calculation and the adjustment for obtaining position information with a microprocessor clock frequency. The microprocessor controls the microprocessor clock frequency according to an accumulated progress of processing the measurement result. Accordingly, reducing power consumption for the GNSS receiver can be realized.

Abstract: A multiple processor system includes a plurality of processors including a first processor and a second processor; a program code storage module coupled to the first processor, the program code storage module for storing program code including first program code for the first processor and second program code for the second processor; and a processor bridge coupled between the first processor and the second processor; wherein the first processor executes the first program code, the second processor is for sending an access request requesting data corresponding to the second program code to the processor bridge; the first processor is for retrieving the access request from the processor bridge, fetching the data from the second program code in the program code storage module according to the access request, and delivering the data to the processor bridge; and the second processor is further for fetching the data from the processor bridge.

Abstract: A spreading signal acquisition and tracking method and apparatus is proposed. In accordance with the present invention, coherent integrations are performed by segments and stored for a non-coherent integration. A better freedom of the non-coherent interval selection is provided. The window of the non-coherent integration is sequentially and gradually shifted to achieve better update rate to its detection circuit and to improve searching and tracking for a spreading signal. By using the present invention, rapid signal acquisition can be achieved even when intensity of the spreading signal is very weak, or even when deeper signal blocking or jamming occurs.

Abstract: A communications system includes a first oscillator for producing a first clock signal; a second oscillator for producing a second clock signal; and a secondary circuit coupled to the first oscillator and the second oscillator for determining a second oscillation frequency corresponding to a frequency of the second clock signal; the second oscillation signal being determined according to the first clock signal, the second clock signal, and a first oscillation frequency corresponding to a frequency of the first clock signal.

Abstract: A route planning triggering method is implemented in a route planning device and includes the following steps. An image is captured through an image capture device coupled to the route planning device. The position information of a geographical location is automatically generated from the captured image for planning a route to the location.

Abstract: A device for canceling a land-groove offset component of a focusing error signal in an optical storage system includes first and second circuits, and an adder. The first circuit processes a radio (or wobble) frequency ripple signal to obtain a first processed signal that is multiplied by a first gain value (G1) so as to result in a first signal. The second circuit processes a tracking error signal to obtain a second processed signal that is multiplied by a second gain value (G2) so as to result in a second signal. The adder is coupled to the first and second circuits, and adds the first and second signals to produce a compensative land-groove offset component that is to be fed into a focusing device of the optical storage system so as to enable the focusing device to cancel out the land-groove offset component of the focusing error signal.

Abstract: A multiple processor system includes a plurality of processors including a first processor and a second processor; a program code storage module coupled to the first processor, the program code storage module for storing program code including first program code for the first processor and second program code for the second processor; and a processor bridge coupled between the first processor and the second processor; wherein the first processor executes the first program code, the second processor is for sending an access request requesting data corresponding to the second program code to the processor bridge; the first processor is for retrieving the access request from the processor bridge, fetching the data from the second program code in the program code storage module according to the access request, and delivering the data to the processor bridge; and the second processor is further for fetching the data from the processor bridge.

Abstract: Read focus error (FE) bias is calibrated on an embossed area of the optical disc. OPC is then performed with the calibrated servo signal bias to obtain a write power level. Data are written on and read from the optical disc based on the write power level and the calibrated servo signal bias.

Abstract: An optical recording system includes an optical pickup, a power auto-control device, and a digital signal processor. The optical pickup includes a laser diode and a photo detector. The power auto-control device generates a drive voltage for driving the laser diode to generate a recording light beam incident upon an optical storage medium. The photo detector is operable to generate a sub-beam added signal from light that was reflected by the optical storage medium and that was detected by the photo detector during recording using the recording light beam. The digital signal processor compares the sub-beam added signal from the photo detector with a predetermined target value, and enables the power auto-control device to adjust the drive voltage in such a manner that the sub-beam added signal approaches the predetermined target value based on result of the comparison made by the digital signal processor.

Abstract: An automatic laser power control apparatus for an optical recording system includes a drive voltage generator and a control unit. The drive voltage generator amplifies a selected control voltage or target value for output. When the control voltage is selected by the drive voltage generator, the apparatus works in a closed-loop control mode. When a recording or reading process is interrupted, the control unit generates a calculated variable gain value based on operation parameters, such as the drive voltage, the control voltage, the variable gain value and the target value, prior to interruption. At the end of interruption, the control unit enables the drive voltage generator to generate the requisite drive voltage according to the recording speed and link point condition, thereby generating the voltage or control state that approximates the closed-loop condition so that there is almost zero transient response in the system.

Abstract: A device for canceling a land-groove offset component of a focusing error signal in an optical storage system includes first and second circuits, and an adder. The first circuit processes a radio (or wobble) frequency ripple signal to obtain a first processed signal that is multiplied by a first gain value (G1) so as to result in a first signal. The second circuit processes a tracking error signal to obtain a second processed signal that is multiplied by a second gain value (G2) so as to result in a second signal. The adder is coupled to the first and second circuits, and adds the first and second signals to produce a compensative land-groove offset component that is to be fed into a focusing device of the optical storage system so as to enable the focusing device to cancel out the land-groove offset component of the focusing error signal.