1
Richard C Cabot: Tunable bandpass filter system and filtering method. Audio Precision, William A Birdwell & Associates, August 4, 1992: US05136267 (111 worldwide citation)

A tunable bandpass filter system and filtering method wherein the bandwidth of a tunable bandpass filter is adjusted as a function of the fundamental frequency of an input signal. Either a constant bandwidth or a constant quality factor tunable bandpass filter may be used. The center frequency of th ...


2
Richard C Cabot: Method and apparatus for fast response and distortion measurement. Audio Precision, William A Birdwell & Associates, December 12, 1995: US05475315 (34 worldwide citation)

A method and apparatus for fast response and distortion measurement of a signal transfer device. A computer processor generates a multitone test signal of predetermined duration and stores it in a memory. The test signal is read out, converted to analog form, if necessary, and applied to the input o ...


3
Richard C Cabot: Method and apparatus for fast response and distortion measurement. Audio Precision, William A Birdwell & Associates, May 30, 1995: US05420516 (28 worldwide citation)

A method and apparatus for fast response and distortion measurement of a signal transfer device. A computer processor generates a multitone test signal of predetermined duration and stores it in a memory. The test signal is read out, converted to analog form, if necessary, and applied to the input o ...


4
Richard C Cabot: Method and apparatus for fast response and distortion measurement. Audio Precision, William A Birdwell & Associates, May 5, 1998: US05748001 (21 worldwide citation)

A method and apparatus for fast response and distortion measurement of a signal transfer device. A computer processor generates a multitone test signal of predetermined duration and stores it in a memory. The test signal is read out, converted to analog form, if necessary, and applied to the input o ...


5
Richard C Cabot: Method and apparatus for communicating auxiliary information in a measurement signal. Audio Precision, July 15, 1997: US05649304 (20 worldwide citation)

A method and apparatus for fast response and distortion measurement of a signal transfer device. A computer processor generates a multitone test signal of predetermined duration and stores it in a memory. The test signal is read out, converted to analog form, if necessary, and applied to the input o ...


6
Richard C Cabot: Method and system for measuring signal transfer characteristics in the presence of WOW, flutter and intermodulation distortion. Audio Precision, William A Birdwell & Associates, October 6, 1998: US05818240 (18 worldwide citation)

A method and apparatus for fast response and distortion measurement of a signal transfer device. A computer processor generates a multitone test signal of predetermined duration and stores it in a memory. The test signal is read out, converted to analog form, if necessary, and applied to the input o ...


7
Richard C Cabot: Method and circuit for compensation of a multiplying digital-to-analog converter. Audio Precision, William A Birdwell, December 23, 1986: US04631522 (14 worldwide citation)

A method and circuit for reducing the effect of variations in resistances within a multiplying digital-to-analog converter. A first resistor is connected at one end to the feedback resistor of the MDAC, the other end providing a compensated circuit input. A second resistor is connected from the MDAC ...


8
Richard C Cabot: Hybrid form digital filter. Audio Precision, William A Birdwell, February 18, 1992: US05089981 (12 worldwide citation)

A hybrid form digital filter. A digital filter is provided wherein the zeros of its transfer function are provided by a direct form digital filter portion and the poles of the transfer function are provided by a normal form digital filter portion. The hybrid filter provides truncation noise and stab ...


9
Richard C Cabot: Method and apparatus for recognizing a test signal and determining signal transfer characteristics therefrom. Audio Precision, William A Birdwell & Associates, May 5, 1998: US05749047 (12 worldwide citation)

A method and apparatus for fast response and distortion measurement of a signal transfer device. A computer processor generates a multitone test signal of predetermined duration and stores it in a memory. The test signal is read out, converted to analog form, if necessary, and applied to the input o ...


10
Richard C Cabot, Robert G Wright, Carl A Hovey: Master-slave processor human interface system. Audio Precision, William A Birdwell & Associates, November 23, 1993: US05265201 (9 worldwide citation)

A master-slave processor human interface system. An electronic device, a slave processor for controlling the electronic device and performing certain computational functions, a master processor for controlling the slave processor, an input device and an output device associated with the master proce ...