Abstract: A body impedance measurement apparatus and method as well as the transmitter and receiver of a body impedance measurement apparatus are provided. A body impedance measurement apparatus includes transmitter means configured to provide (62) an amplitude modulated signal via a transmitting electrode means (10) to a body to which the transmitting electrode means (10) is applied. The body impedance measurement apparatus also includes receiver means for receiving (64) signals, responsive to the amplitude modulated signal, via a receiving electrode means (12) that is configured to be applied to the body and to be remote from the transmitting electrode means (10) so as to be in wireless communication with the transmitting electrode means (10) via the body. The receiver means is configured to process (68) the received signals to determine a measure of the body impedance.

Abstract: An energy-efficient system for measurement of analog signals including one or more measuring units. Each measuring unit has a measuring probe which signal is processed by a modulator. All measuring units have identical modulators selected from the Time Encoding Machine family: Asynchronous Sigma Delta Modulator, Integrate And Fire Modulator and Integral Pulse Frequency Modulator. A signal from the modulator is processed by a delay circuit from which is optionally fed back to the modulator. Signals from the delay circuit and modulator are used to trigger a UWB pulse generator, which is optionally amplified and transmitted via transmission line or antenna. The delay circuit uniquely characterizes the measuring unit and enables the receiving unit to separate received signals from plurality of measuring units signals sent in an unsynchronized manner. The invention is useful for long term acquisition of analog signals, especially time varying signals such as biological signals.

Abstract: An energy-efficient system for measurement of analogue signals including one or more measuring units. Each measuring unit has a measuring probe which signal is processed by a modulator. All measuring units have identical modulators selected from the Time Encoding Machine family: Asynchronous Sigma Delta Modulator , Integrate And Fire Modulator and Integral Pulse Frequency Modulator. A signal from the modulator is processed by a delay circuit from which is optionally fed back to the modulator. Signals from the delay circuit and modulator are used to trigger a UWB pulse generator, which is optionally amplified and transmitted via transmission line or antenna. The delay circuit uniquely characterizes the measuring unit and enables the receiving unit to separate received signals from plurality of measuring units signals sent in an unsynchronized manner. The invention is useful for long term acquisition of analog signals, especially time varying signals such as biological signals.