Abstract: An interference-resistant method for a wireless audio system capable of transforming an audio signal into an RF signal includes transforming the audio signal into a PCM signal, appending a first control signal to the PCM signal, and modulating the PCM signal with the first control signal into an analog base-band signal. The method further includes up-converting the analog base-band signal into the RF signal and transmitting the RF signal into the air in a transmitting mode and receiving the RF signal in the air during a receiving mode. The channel is switched to another one upon determining that a Received Signal Strength Indicator (RSSI) level of the RF signal is greater than a first predetermined value a plurality of times within a predetermined time interval.

Abstract: An interference-resistant wireless audio system includes a transceiver for transforming an audio signal into an RF signal, and a receiver for receiving RF signals in the air. The transceiver has an audio signal receiver, an audio data format converter, a frame and coding unit, a modulation module, an RF transceiver, a receiving/transmitting switch controller, an RF signal detector, and a channel switch controller electrically connected to the RF signal detector for controlling the RF transceiver to switch the used channel to another one after receiving a switch signal generated by the RF signal detector.

Abstract: An apparatus includes a receiving circuit, a demodulation module, a frame synchronization control module, a filter, and an audio conversion device. The receiving circuit is used to receive a radio frequency signal and generate a corresponding baseband signal. The demodulation module is electrically connected to the receiving circuit for demodulating the baseband signal and for correspondingly outputting sequential data. The frame synchronization control module is electrically connected to the demodulation module for synchronizing the data and outputs the sequential data. The filter is electrically connected to the frame synchronization control module for filtering out erroneous data outputted from the frame synchronization control module. The audio conversion device is connected to the filter for transferring an output of the filter into a corresponding audio signal.

Abstract: A planner inverted-F antenna (PIFA) includes a ground plane, a rib-shaped radiation plate installed approximately in parallel with the ground plane, a feeding line installed on the rib-shaped radiation plate, a feeding contact installed on an end of the feeding line, and a ground contact electrically connected to the ground plane.

Abstract: This specification provides a burst synchronization and error detection device, which can generate in the synchronization module of the burst synchronization and error detection device a syndrome shared with the error detection module so as to decrease the computation time of the syndrome, shortening the processing time of error detection. The present invention also provides a burst synchronization and error detection method.

Abstract: A wireless local loop equipment parameter setting system and method that uses a telephone attached to wireless local loop equipment to issue a control instruction. The wireless local loop equipment receives the control instruction, translates the instruction and sets or displays the parameters accordingly. A miniature display device connected to the wireless local loop equipment through a serial transmission interface is used to display the control instruction and content of the parameters so that a user may set parameters with ease.

Abstract: A Personal Access Communications System (PACS) subscriber unit (SU) layer 3 interface is designed as a finite state machine that includes a unique slot seizing state. All transitions from a null state that require traffic channel seizing first transition to the slot seizing state before transitioning to another associated handling state. While in the slot seizing state, the SU layer 3 interface state machine awaits confirmation of traffic channel establishment.

Abstract: In a method of updating a set of candidate frequency channels during wireless communications between a radio port and a mobile communications device, the communications device switches to a current measured one of multiple pre-stored frequency channels not in a current set of candidate frequency channels to measure signal quality after an assigned time slot of a current time frame of a second time sequence, and switches back to a current working frequency channel prior to the assigned time slot of a succeeding time frame of a first time sequence. The mobile communications device updates a current set of the candidate frequency channels with the current measured frequency channel when the signal quality attributed to the current measured frequency channel is better than those attributed to the current set of the candidate frequency channels.

Abstract: The invention discloses a phase detection method including a quadrant determining procedure, a first comparison procedure, a second comparison procedure, a coordinate transforming procedure, and a phase computing procedure. A first and a second phase approximate values are obtained in the quadrant determining procedure and the first comparison procedure. A third phase approximate value is obtained in the second comparison procedure and the coordinate transforming procedure. A total phase is computed in the phase computing procedure. Using this method, we does not need to consult look-up tables to determine the phase, thus saving a lot of memory space. The invention also provides a phase detection device.