An ultrasonic imaging device is disclosed comprising an ultrasonic transducer array 11, a multiplexer 15 comprising a plurality of inputs and at least one output, each input coupled to a respective transducer element of the array, an analogue front-end 23 comprising at least one channel, each channel coupled to a respective output of the multiplexer and each channel including a respective analogue demodulator 44, 45 arranged to extract in phase and quadrature components of a signal from the transducer and to provide demodulated in-phase and quadrature signal components 50, 51, at least two analogue-to-digital converters 60/61 configured to receive signals comprising or obtained from the in-phase and quadrature signal components and to provide digitised demodulated in-phase and quadrature signal components and a wireless interface 32 configured to transmit signals comprising or obtained from the digitised demodulated in-phase and quadrature signal components. The device may include first and second low pass filters for the respective in-phase and quadrature signals. The analogue-to-digital converters may sample at a non-uniform rate. An independent claim is also included for a signal processor device that receives parametric or filtered quasi in-phase and quadrature signals and reconstructs them to perform synthetic aperture beamforming.
