Clinton C Powell has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
Abstract: A symbol detector (110) includes an analog-to-digital converter (115) for converting signal voltages to digital values and peak and valley counters (310, 315) for tracking the digital values to determine peak and valley values associated with high and low voltages of the signal. The symbol detector (110) further includes calculation circuitry (356) for calculating upper, lower, and center thresholds based on the peak and valley values and a decoder (125) for generating data symbols in accordance with the upper, lower, and center thresholds.
July 17, 1995
Date of Patent:
September 23, 1997
Mark L. Servilio, Carla J. Maroun, Daniel Morera, Clinton C. Powell, II
Abstract: A communication device with a synchronized zero-crossing demodulator is described. A synchronizer system (123, 223, 125, 227) and method derives symbol transition timing information from a zero-crossing detector output. The synchronizer (123, 223) is, in one embodiment, connected to the output of a zero-crossing detector (120, 220), to provide an edge clock signal to a phase angle estimator (122, 226), which is passed to a decision device 124, which provides a symbol estimate which is later decoded into an information message. In an alternative embodiment, a synchronizer is combined with the phase angle estimator (125, 227) to provide as an output, a phase angle estimate which is passed to a decision device (124) which provides a symbol estimate signal (127, 229), which is later decoded to obtain the information message.
August 3, 1995
Date of Patent:
May 27, 1997
Clinton C. Powell, II, Edward K. B. Lee, Hyuck M. Kwon
Abstract: A radio communication device (100) for recovering information from a received signal includes a demodulator (110) for demodulating the received signal into in-phase (I) and quadrature (Q) components and a multiplier (115) for multiplying the I and Q components together to generate a multiplied waveform. A polarity detector (125) coupled to the multiplier (115) determines from the multiplied waveform a polarity variable indicative of a data symbol, and a processor (135) recovers the information from the received signal in accordance with the data symbol.
Abstract: A method and apparatus improves the perceived quality of a voice message received in a radio signal by a radio communication receiver (108) having voice storage capability and operating in a fading signal environment. A monitor (203) repeatedly monitors (304) a received radio signal quality indication during intervals of reception of contiguous portions of the voice message, and a selective storage element (228) selectively stores (308) for later playback (404) only those portions of the voice message received during the intervals of reception having a radio signal quality indication higher than a predetermined threshold.
Abstract: Briefly, according to the invention, a receiver (100) for receiving a carrier signal MSK (minimum shift keying) modulated with a bit stream of a digital information signal (302) is disclosed. The receiver (100) comprises a quadrature demodulator (128) for providing baseband quadrature demodulated signals (306 and 308). The quadrature demodulated (128) is coupled to an EXOR (126) for providing a decoded bit stream of the digital information signal (312) thereby avoiding complex decoder circuits. The quadrature demodulator (128) includes a pair of mixers (106 and 108) for quadrature mixing the received carrier signal and a pair of filters (114 and 118) for filtering the outputs of the mixers (106 and 108). The filters (114 and 118) are coupled to a pair of limiters (116 and 120) for limiting the filtered signals.