Abstract: The present invention relates to a hearing instrument which comprises: (a) a housing; (b) an RF receiver; (c) plurality of conductive elements, each conductive element has the form of a plate, is positioned on said housing so it provides coupling with the device wearer's skin while the instrument is in use, thereby forming an antenna element together with the wearer's body; (d) a switch for each conductive element, for connecting or disconnecting the respective antenna element from the receiver; (e) a controller for periodically initiating a testing cycle wherein during said cycle: (e.1) the controller sequentially scans said switches by closing each time another switch, thereby to connect each time a respective antenna element to said receiver; (e.

Abstract: The invention relates to a switched low-energy consumption amplifier for a piezoelectric element, which comprises: (a) an inductor, which together with the capacitance of said piezoelectric element forms an LC circuit; (b) a battery connected to said LC circuit; (c) a set of controlled switches capable of connecting and disconnecting circuit components at a rate which is significantly higher than the frequency of an input signal to said circuit; (d) a comparator for receiving an input signal, comparing a present voltage value of the input signal with a present voltage value over said piezoelectric element or a part, thereof, and conveying an indication regarding said comparison to a switching control unit; and (e) a switching control unit for receiving said indication from said comparator, and determining repeatedly every period P, which is significantly shorter than the period of the highest frequency included within said input signal, whether the piezoelectric element should be charged or discharged, and ac

Abstract: The invention relates to a low power radio frequency receiver which comprises: (a) an antenna for receiving a first radio frequency signal; (b) a radio frequency amplifier for amplifying the first radio frequency signal received by said antenna; (c) an oscillator for generating a second radio frequency signal having a predefined frequency and a predefined duty cycle to be mixed with said first radio frequency signal received by said antenna; (d) a mixer for mixing the first amplified radio frequency signal with second radio frequency signals and generating a third radio frequency signal; (e) an intermediate frequency filter for passing one or more intermediate frequencies of said third radio frequency signal and attenuating other frequencies of said third signal that are lower or higher than its cutoff frequencies, characterized in that it further comprises: (f) one or more switches for periodically and synchronously switching ON and OFF one or more of said radio frequency amplifier, said oscillator, and said

Abstract: Vibration transmitting apparatus comprises a vibrating element utilizing a piezoelectric membrane element installed within a bio-compatible sealed case, wherein one end of the piezoelectric element is in static positioned relationship with respect to its casing and the other end is free to move and to vibrate.