A new incus-body driving type transducer relying on piezoelectric stack, with broad frequency bandwidth, is proposed for use in a middle ear implant. To aid the design process of this transducer, a coupling biomechanical model of the human middle ear and the piezoelectric transducer was established by reverse engineering technology. The validity of this model was confirmed by comparing model pr...

The aim of this publication is to design a procedure for the synthesis an IDT (interdigital transducer) with diluted electrodes. paper deals surface acoustic waves (SAW) and theory asymmetrical delay line interdigital transducer authors developed theory, design, implementation proposed design. They also measured signals. analysed acoustoelectronic components SAW: PLF 13, PLR 40, PAV 44 PLO. pre...

An approximate solution for the acoustic coupling factor (the diffraction correction function) from a focused transducer to a flat plate and back to the transducer is provided. This function is useful for system calibrations where a pulse-echo system or transmit-receive system is used. Numerical solutions are provided for the important case where the flat plate is placed near the focal plane of...

(2) signal preprocessing path; (3) signal post-processing path. In this paper, a new transducer to system interface is developed to suppress the noise from the transducer and its interface to system. Several features unique to the transducer to system interface that could help suppress the noise from the transducer and its interface to the system (1) differential input is adopted in the front e...

In a 2-alternative forced-choice (2AFC) discrimination task, observers choose which of two stimuli has the higher value. The psychometric function for this task gives the probability of a correct response for a given stimulus difference, Δx. This paper proves four theorems about the psychometric function. Assuming the observer applies a transducer and adds noise, Theorem 1 derives a convenient ...

We introduce the synchronization of a pushdown automaton by a sequential transducer associating an integer to each input word. The visibly pushdown automata are the automata synchronized by an one state transducer whose output labels are −1, 0, 1. For each transducer, we can decide whether a pushdown automaton is synchronized. The pushdown automata synchronized by a given transducer accept lang...

Whereas ultrasound application has been emerging, the need of reliable transducer to comply with that purpose is also aroused. Multi-resonance transducer using lead zirconate titanate piezoelectric ceramics (PZT) was designed several years ago for dual Doppler and B mode use. As polymer material being popular in medical ultrasound, there are chances to combine it with former piezoelectric mater...

The initial design of a vertical magnetoresistive head in a hand-held wand for reading magnetically encoded price tags and credit cards is discussed. The performance of the head (e.g., resolution, signal shape and amplitude, and signal-to-noise ratio) is analytically and experimentally evaluated as a function of the configuration of the sensor, head-to-medium interface, and sensor processing an...

We show that for every deterministic bottom-up tree transducer, a unique equivalent transducer can be constructed which is minimal. The construction is based on a sequence of normalizing transformations which, among others, guarantee that non-trivial output is produced as early as possible. For a deterministic bottom-up transducer where every state produces either none or infinitely many output...