Abstract: The apparatus described unaliases a Doppler signal which is related to the velocity of blood flowing in a sample volume. It then generates an audio output corresponding to the unaliased Doppler signal. The device generates an unaliased, instantaneous signal which corresponds to the Doppler frequency associated with the blood velocity in the sample volume. That unaliased instantaneous frequency is fed into programmable read only memories (PROMs) which provide digitized values for the sine and cosine functions. Those values are fed into digital-to-analog converters, and they are scaled to provide audio outputs.

Abstract: Elongated, flexible printed circuit board coaxial cable which is made using a pattern on a flexible PCB substrate on which coaxial cables are formed is described. A series of slits and folds allows one or more elongated cables to be formed in each pattern. Such cables are particularly useful for connecting multi-connector apparatus of the type which requires coaxial cables interconnected in very close spaces, such as the type used in ultrasound transducers.The method for manufacturing such elongated, flexible printed circuit board coaxial cable is also described. The method includes forming a pattern on a flexible PCB substrate on which coaxial cables are formed. Thereafter, a series of slits and folds allows one or more elongated cables to be formed in each pattern.Such cables are particularly useful for connecting multi-connector apparatus of the type which requires coaxial cables interconnected in very close spaces, such as the type used in ultrasound transducers.