摘要:
A ground station multiplexes audio digital data of a plurality of audio broadcasts, GUI data, and download audio data and transmits the multiplexed signal to a receiving side through a satellite. The receiving side displays a GUI screen corresponding to an audio broadcast. When a music information selection command is input on the display screen, an audio broadcast of a music program corresponding to the music information is selected. When a music information download command is input on the display screen, download audio data corresponding to the music information is output. The download audio data is stored to a storage device so as to download audio data corresponding to a desired music title.
摘要:
An envelope tracking power supply arranged to generate a modulated supply voltage in dependence on a reference signal, comprising a first path for tracking low frequency variations in the reference signal and a second path for tracking high frequency variations in the reference signal, and further comprising a combiner having a low frequency combining element for the first path and a high frequency combining element for the second path, and for generating the modulated supply voltage, wherein there is further provided sensing circuitry for sensing a resonance signal in the low or high frequency combining element, and adjusting circuitry for adjusting a signal in the first path in dependence on the sensed resonance signal.
摘要:
The invention concerns a machine-readable medium having instructions stored therein, which when executed by a processor of an apparatus remote from a mobile global positioning system (GPS) receiver cause the processor to perform a method for determining the position of the mobile GPS receiver, the mobile GPS receiver being located within a cell served by a cell site and being coupled to a cell-based cellular communication device transmitting and receiving cellular communications signals to and from the cell site, the method comprising: monitoring transmissions of cellular communications signals corresponding to the cellular communication signals received by said cell-based cellular communication device from said cell site; determining a time-of-day of at least a portion of said transmissions; receiving from said mobile GSP receiver, a relative time of pseudoranges measurement with respect to a time indicator within the cellular communication signals received by said cell-based cellular communication device from said cell site; determining the time of pseudoranges measurement at the mobile GPS receiver from said time-of-day and said relative time; and wherein the position of said mobile GPS receiver is determined using said determined time of pseudoranges measurement.