61
Jingfeng Liu, Haotian Zhang, Hongwei Song: Systems and methods for semi-independent loop processing. LSI Corporation, Hamilton DeSanctis & Cha, August 7, 2012: US08237597 (71 worldwide citation)

Various embodiments of the present invention provide systems and methods for data processing. For example, a data processing circuit is discussed that includes an analog to digital converter circuit, a digital filter circuit, a data detector circuit, a mimic filter circuit, and a sample clock genera ...


62
Tsutomu Hamabe, Akio Kinoshita, Kazuhiro Doi, Kenichiro Muraoka, Noriharu Sato: Apparatus for actively reducing noise for interior of enclosed space. Nissan Motor, Hitachi, Lowe Price LeBlanc & Becker, August 9, 1994: US05337365 (71 worldwide citation)

An apparatus for reducing noise for an interior of enclosed space, e.g., a vehicular compartment using an FIR adaptive digital filter is disclosed in which a control circuit is provided which outputs drive signals to a plurality of loud speakers which generate control sounds to interfer with a noise ...


63
Abraham Hasarchi: System and method for excluding narrow band noise from a communication channel. Dekolink Wireless, EMPK & Shiloh, December 2, 2008: US07460831 (70 worldwide citation)

A signal filtering system and method that may be used in conjunction with a repeater or an input stage of a base-station. The system may include an analog to digital converter adapted to sample a received signal and to produce a data stream corresponding to the received signal in the time domain, a ...


64
Ka Yin Leung: Digital filter with decimated frequency response. Crystal Semiconductor, Gregory M Howison, J P Violette, December 9, 1997: US05696708 (70 worldwide citation)

A method for changing the frequency of a low-pass Finite Impulse Response (FIR) filter with a fixed frequency clock utilizes a decimation-by-coefficient technique. The decimation-by-coefficient method utilizes a single set of coefficients that are stored in a coefficient Read Only Memory (ROM) (64). ...


65
Croisier Alain, Esteban Daniel J, Levilion Marc E, Riso Vladimir: Digital filter for pcm encoded signals. International Business Machines Corporation, December 4, 1973: US3777130 (70 worldwide citation)

A digital filter either of a recursive or transversal type responsive to successive digitally encoded analog signal samples of m bits each. The filter comprises an accumulator for multiplying and summing a weighted hybrid value obtained from a memory medium addressed by a selected one of the m bits ...


66
Lane Allen Smith: System for digital filtering in a fixed number of clock cycles. Lucent Technologies, William H Bollman, January 16, 2001: US06175849 (70 worldwide citation)

An integrated circuit, e.g. an AC '97 conforming audio codec, includes a digital filter and gain module including multiple channels of gain control and multiple channels of digital filtering. A gain control module includes an overflow check of data samples requiring differing lengths of clampin ...


67
Tamal Bose, Howard Vincent Derby, Andrew Keith Levien, Anthony William Pankratz: Method and apparatus for measuring pressure in a coriolis mass flowmeter. Micro Motion, Duft Graziano & Forest P C, March 31, 1998: US05734112 (68 worldwide citation)

A method for determining pressure in an operating Coriolis effect mass flowmeter. The Coriolis flowmeter flow tubes are vibrated in both a bending mode (as is normal for measuring mass flow rate) and in a twisting mode. The ratio of the fundamental frequencies at which the flow tubes vibrate in each ...


68
Yutaka Takahashi: Echo canceler having adaptive digital filter unit associated with delta-sigma modulation circuit. NEC Corporation, Sughrue Mion Zinn Macpeak & Seas, June 22, 1993: US05222084 (67 worldwide citation)

An echo canceler comprises an adaptive digital filter circuit for producing an echo replica signal on the basis of a transmit digital signal and a first digital signal indicative of a far-end signal, and an adder for eliminating the echo signal from a received signal with reference to the echo repli ...


69
William Dean Warner, Soon Sun Shin, Andrew S Wright: Wideband analog quadrature modulator/demodulator with pre-compensation/post-compensation correction. PMC Sierra, Knobbe Martens Olson & Bear, September 6, 2005: US06940916 (67 worldwide citation)

The present invention is related to methods and apparatus that compensate for quadrature impairments of an analog quadrature modulator and/or demodulator over a relatively wide signal bandwidth. One embodiment pre-distorts baseband signals in a quadrature modulator compensation signal processor (QMC ...


70
Jonathan Herman Fischer, Lane Allen Smith: Recursive digital filter with reset. Lucent Technologies, William H Bollman, December 26, 2000: US06167415 (67 worldwide citation)

An integrated circuit, e.g. an Audio Codec (AC) '97 conforming audio codec, includes a digital filter and gain module including multiple channels of gain control and multiple channels of digital filtering. A gain control module includes an overflow check of data samples requiring differing lengths o ...