Abstract: Devices and methods of detecting a predetermined audio signal in audio signals are provided. A device includes a processor coupled to a clock signal generator, a power controller and an audio detector. The power controller controls a clock rate provided to the processor by the clock signal generator, to control the device to operate in a low power mode having a relatively low power consumption or in a normal power mode having a relatively high power consumption. The audio detector receives audio signals and detects, in the low power mode, probable presence of a predetermined audio signal in the audio signals. The power controller controls the device to switch from the low power mode to the normal power mode responsive to the detected presence of the predetermined audio signal by the audio detector.

Abstract: A signal receiver capable of operating in two modes: a normal mode for reception and decoding of signals and a detection mode for detecting the presence of signals, the signal receiver having: a functional unit that can operate in two manners: a first manner having relatively low power consumption and relatively poor accuracy and a second manner having relatively high power consumption and relatively high accuracy, and a controller for causing the functional unit to operate in the first manner when the receiver is in its detection mode and in the second manner when the receiver is in its normal mode.

Abstract: A communication device arranged to operate in accordance with a communication protocol in which a transmitting device is scheduled to commence a transmission at a time known in advance to the receiving device, includes at least two antennas and is arranged to select one of those antennas to receive a transmission from a transmitting device by, immediately before the transmitting device is scheduled to commence its transmission: assessing a quality of a signal received by means of a first one of the antennas; assessing a quality of a signal received by means of a second one of the antennas; and determining, based on the assessed quality of the signals received by means of the first and second antennas, the antenna to be used for receiving the transmission from the transmitting device.

Abstract: A communication device for receiving a signal in the form of a series of bursts, each burst being at one of a plurality of different available transmission modes, the communication device comprising: two antennas; a receiver unit coupled to the antennas for preferentially receiving signals from a selected one of the antennas; and an antenna selection unit for selecting for each received burst with which of the antennas the receiver unit is to preferentially receive signals.

Abstract: A radio transceiver comprising: a signal receiver for receiving signals in the form of bursts according to a first protocol; a transmitter for transmitting signals in the form of bursts according to a second protocol, the first and second protocols being such that signals of the first and second protocols are mutually interfering; a transmission scheduler for predicting, based on the timings of signal bursts of the first protocol received by the receiver, the timings of future bursts of the first protocol and arranged to influence the transmitter to transmit bursts according to the second protocol so as to avoid the signal bursts of the first protocol as predicted.

Abstract: A signal receiver capable of operating in two modes: a normal mode for reception and decoding of signals and a detection mode for detecting the presence of signals, the signal receiver having: a functional unit that can operate in two manners: a first manner having relatively low power consumption and relatively poor accuracy and a second manner having relatively high power consumption and relatively high accuracy, and a controller for causing the functional unit to operate in the first manner when the receiver is in its detection mode and in the second manner when the receiver is in its normal mode.

Abstract: A communication device arranged to operate in accordance with a communication protocol in which a transmitting device is scheduled to commence a transmission at a time known in advance to the receiving device, includes at least two antennas and is arranged to select one of those antennas to receive a transmission from a transmitting device by, immediately before the transmitting device is scheduled to commence its transmission: assessing a quality of a signal received by means of a first one of the antennas; assessing a quality of a signal received by means of a second one of the antennas; and determining, based on the assessed quality of the signals received by means of the first and second antennas, the antenna to be used for receiving the transmission from the transmitting device.

Abstract: A communication device for receiving a signal in the form of a series of bursts, each burst being at one of a plurality of different available transmission modes, the communication device comprising: two antennas; a receiver unit coupled to the antennas for preferentially receiving signals from a selected one of the antennas; and an antenna selection unit for selecting for each received burst with which of the antennas the receiver unit is to preferentially receive signals.

Abstract: A radio transceiver comprising: a signal receiver for receiving signals in the form of bursts according to a first protocol; a transmitter for transmitting signals in the form of bursts according to a second protocol, the first and second protocols being such that signals of the first and second protocols are mutually interfering; a transmission scheduler for predicting, based on the timings of signal bursts of the first protocol received by the receiver, the timings of future bursts of the first protocol and arranged to influence the transmitter to transmit bursts according to the second protocol so as to avoid the signal bursts of the first protocol as predicted.