31
Malcolm J Williamson, Diane K Bustamante: Feedback suppression in digital signal processing hearing aids. Wisconsin Alumni Research Foundation, Foley & Lardner, February 25, 1992: US05091952 (96 worldwide citation)

Acoustic feedback in digital signal processing hearing aids is suppressed by using signal processing techniques in the digital processor. A first processing technique causes the data to the main signal processing path in the digital signal processor to be delayed by varying amounts over time, prefer ...


32
Adrian B Early, Larry L Harris, Michael J Callahan Jr: Digitally calibrated delta-sigma analog-to-digital converter. Crystal Semiconductor, Gregory M Howison, July 24, 1990: US04943807 (95 worldwide citation)

A self-calibrated analog-to-digital converter with a corrected output includes an analog modulator (18) for receiving an analog input voltage and outputting a pulse train having a value proportional to the analog input voltage. The pulse train is filtered by a digital filter (20) which has the outpu ...


33
Bernd Prohaska, Hans Dieter Schwartz, Rudolf Winkelmann, Gerhard Zettl: Digital filter switch for data receiver. Siemens Aktiengesellschaft, Hill Van Santen Steadman & Simpson, February 16, 1988: US04726041 (93 worldwide citation)

A digital filter switch for use with a data receiver incorporates first and second squaring units connected to the outputs of first and second band-pass filters tuned to the separation and character frequencies in a signal transmission. The outputs of the squaring units are interconnected via an add ...


34
Philippe Sehier, Cyril Bertrand: Multirate receive device and method using a single adaptive interpolation filter. Alcatel, Sughrue Mion Zinn Macpeak & Seas PLLC, August 3, 1999: US05933467 (92 worldwide citation)

A device for receiving a source digital signal transmitted at one or more source symbol frequencies F.sub.s samples a received analog signal transposed into the baseband and delivers an entirely demodulated sample signal. The sampling frequency F.sub.e complies with the generalized sampling conditio ...


35
Thomas Ying Ching Lo, Yuh Show Tsai: EKG based heart rate monitor with digital filter and enhancement signal processor. Salutron, Townsend and Townsend and Crew, March 2, 1999: US05876350 (89 worldwide citation)

A convenient low-cost heart rate monitor. In one embodiment, a digital filter structure includes a low pass filter having a notch at 60 Hz and a bandpass filter which amplifies signals in a frequency range from 10-40 Hz and has a notch at 60 Hz. This digital filter has a recursive structure and uses ...


36
Xiao Y Guo, Gerard Maral: Digital filter-type frequency demultiplexing device. France Telecom, Lowe Price LeBlanc & Becker, March 29, 1994: US05299192 (89 worldwide citation)

After sampling a multicarrier signal, groups of multiplex modulated carriers with identical bandwidths are separated by group filters. Clock frequencies of the carriers are then reduced by decimators depending on their respective bandwidths. To separate each of the modulated carriers in each of the ...


37
Hirotake Wakai, Makoto Ohnishi, Fumihito Tomaru: Digital modulator having a digital filter including low-speed circuit components. Hitachi Denshi Kabushiki Kaisha, Antonelli Terry Stout & Kraus, July 20, 1999: US05926065 (88 worldwide citation)

A digital demodulator which demodulates an analog signal obtained through a quadrature amplitude modulation to produce a digital demodulated signal includes a converter to convert the analog signal into a digital signal and a signal processor to quadrature-demodulating the digital signal from the co ...


38
Masao Noro, Yusuke Yamamoto, Toshio Maejima: CMOS differential amplifier for a delta sigma modulator applicable for an analog-to-digital converter. Yamaha Corporation, Graham & James, January 25, 2000: US06018262 (85 worldwide citation)

An analog-digital converter includes a .DELTA..SIGMA. modulator, a digital filter, a high-pass filter and a multiplier which are connected in series. Analog input is converted into serial-bit strings by the .DELTA..SIGMA. modulator, for which gain `1/A` is set. The digital filter extracts low-freque ...


39
Mohammad Rez Karim, Robert Louis Cupo, Mohsen Sarraf, Mohammad Zarrabizadeh: Fast frame synchronization. Agere Systems, Istrate Ionescu, December 31, 2002: US06501810 (85 worldwide citation)

A receiver for receiving synchronized digital transmissions organized in frames, each frame having a frame start, has a clock for generating pulses at time intervals with respect to a time reference and a counter for generating a count of the time intervals with respect to the time reference. A/D co ...


40
Kevin T Chan: Integrated Gigabit Ethernet transmitter architecture. Broadcom Corporation, Christie Parker & Hale, July 10, 2001: US06259745 (83 worldwide citation)

A power efficient and reduced electromagnetic interference (EMI) emissions transmitter for unshielded twisted pair (UTP) data communication applications. Transmit data is processed by a digital filter. The digital filter output data is converted to a current-mode analog waveform by a digital-to-anal ...



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