Abstract: A method and apparatus for operation of a hearing aid 205 with signal processing functions performed with an array processor 220. In one embodiment, a reconfiguration module 250 allows reconfiguration of the processors 220 in the field. Another embodiment provides wireless communication by use of earpieces 105, 110 provided with antennas 235 in communication with a user module 260. The method includes steps of converting analog data into digital data 915 filtering out noise 920 and processing the digital data in parallel 925 compensating for the user's hearing deficiencies and convert the digital data back into analog. Another embodiment adds the additional step of reconfiguring the processor in the field 1145. Yet another embodiment adds wireless communication 1040-1065.

Abstract: A method for converting analog values into digital form comprises comparing a current analog sample value with an analog input value to produce an outcome, generating a count value based on the outcome, the count value increasing upon successive like outcomes and being reset to an initial count value upon successive unlike outcomes, adding or subtracting the count value to/from a current digital sample value to generate a next digital sample value, the adding or subtracting being based on the outcome, and converting the next digital sample value to the current analog sample value.

Abstract: A method for converting analog values into digital form comprises comparing a current analog sample value with an analog input value to produce an outcome, generating a count value based on the outcome, the count value increasing upon successive like outcomes and being reset to an initial count value upon successive unlike outcomes, adding or subtracting the count value to/from a current digital sample value to generate a next digital sample value, the adding or subtracting being based on the outcome, and converting the next digital sample value to the current analog sample value.

Abstract: A dynamic equalization system 12 for use in audio reproduction systems. The apparatus includes a chirp tone generator 38 which produces a tone having multiple frequencies. The chirp tone is broadcast into the listening space 10 from a transducer 14. The broadcast chirp tone is monitored by a second transducer 22 at the listening position to produce a received chirp tone. The received tone and the original tone are compared in a coefficient computer 44 connected to a programmable equalizer 42. The equalizer 42 uses the signal from the coefficient computer to compensate for irregularities 47 in listening space 10 and transducer 14 to produce a substantially undistorted listening experience from source 28 in listening space 10. The first step of the method of the invention is generation of a chirp tone. The chirp tone includes multiple frequencies. The chirp tone is broadcast into the listening space from a transducer placed at the selected transducer position.

Abstract: A method for converting analog values into digital form comprises comparing a current analog sample value with an analog input value to produce an outcome, generating a count value based on the outcome, the count value increasing upon successive like outcomes and being reset to an initial count value upon successive unlike outcomes, adding or subtracting the count value to/from a current digital sample value to generate a next digital sample value, the adding or subtracting being based on the outcome, and converting the next digital sample value to the current analog sample value.

Abstract: A portable animal control unit includes circuitry incorporated in a miniature housing for generating an animal influencing modulated soundwave in the ultrasonic frequency range. A first oscillator produces an output signal for driving an ultrasonic transducer, the output signal having a center frequency in the ultrasonic range. A second oscillator produces an output control signal for modulating the frequency of the first oscillator, the modulation rate being determined by the center frequency of the second oscillator output signal and the amount of deviation of the second oscillator from the center frequency.

Abstract: An apparatus and method for mapping data associated with spacial polar angles into a Cartesian coordinate system is disclosed. In the described application, ultrasound returns from a rotating transducer are mapped into a memory to permit presentation on a raster scanned display. A tangent function is used to compute X and Y locations in a digital differential analyzer. The selection of data for these locations is controlled with a secant function by a second digital differential analyzer to minimize quantizing errors.

Abstract: An input voltage controlled oscillator circuit for a digital video time base corrector used to process television signals to remove time base errors introduced during signal recording, reproducing, or transmission. In the time base corrector, incoming video signals are converted from analog-to-digital form, temporarily stored in a memory unit at a clocking rate which varies in a manner generally proportional to the time base errors, and the stored signals are fetched at a standard clocking rate.The input voltage controlled oscillator circuit generates the clock signals for performing the analog-to-digital conversion and for storing the digital signals in the memory unit. The frequency of the clock signals varies in accordance with the time base errors in the composite sync and burst portions of the incoming video signals.

Abstract: A method and apparatus for synchronizing unrelated video type signals from two different sources without employing feedback loops between the two sources.Incoming video signals are converted from analog to digital form and are clocked into a shift register unit by input clock signals phase and frequency locked to the instantaneous horizontal frequency and the color burst frequency portions of the incoming signal. The digitized video signals progressing along the shift register are stored at the input clock signal rate in a random access (RAM) having a sufficient capacity to provide continuous output video signals during each field. The signals are clocked out from the RAM by output clock signals derived from the sync and color burst portions of a local signal comprising either composite video or composite color burst, which are synchronized with the local sync generator.

Abstract: A sequence control unit for a digital video time base corrector used to process television signals to remove time base errors introduced during signal recording, reproducing, or transmission. In the time base corrector, incoming video signals are converted from analog to digital form, temporarily stored in a memory unit at a clocking rate which varies in a manner generally proportional to the time base errors, and the stored signals are fetched at a standard clocking rate. The sequence control unit controls contemporaneous storing and fetching from different portions of the memory unit and includes circuitry for preventing application of both store and fetch signals to the same memory unit portion when the accumulated time base error would cause such an overlap condition.