Abstract: An audio plug for mounting on a printed circuit board, comprising: an insulative housing; a plurality of contacts, each of them being comparted by the insulative housing, wherein each contact has a front portion for mating with an audio jack and a back portion, said back portion has a plurality of welding portions with flat welding plates for welding the audio plug to the printed circuit board. Welding the PCB with the welding plates instead of welding cable saves the materials and spaces; and the flat welding plates with more area than the traditional audio plug makes the welding easier; the PCB is harder than the cable that makes the audio plug strength.

Abstract: A transducer system and method for harmonic imaging is provided. At least one transducer element is provided. The transducer element comprises two or more stacked piezoelectric layers. Information from each of the layers is independently processed during one of a transmit event, a receive event, and both transmit and receive events. Information from the transducer element is provided to a filter. The filter isolates harmonic information for imaging. By providing a multi-layer transducer element with independent processing for each layer, a wide bandwidth transducer for harmonic imaging is provided. The null associated with most transducers at the second harmonic of a fundamental frequency is removed or lessened.