61
Ka Yin Leung: Digital filter with decimated frequency response. Crystal Semiconductor, Gregory M Howison, J P Violette, December 9, 1997: US05696708 (68 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). ...


62
Lane Allen Smith: System for digital filtering in a fixed number of clock cycles. Lucent Technologies, William H Bollman, January 16, 2001: US06175849 (67 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 ...


63
Heinz Gockler: Digital filter tree. ANT Nachrichtentechnik, Spencer & Frank, June 13, 1989: US04839889 (66 worldwide citation)

The invention relates to a digital filter tree composed of a plurality of digital filter banks arranged in a tree structure one behind the other to branch out in stages with a separation into L.sub..nu. individual signals taking place in each stage and the sampling rate being reduced each time by th ...


64
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 (65 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 ...


65
Kevin T Chan: Adaptive configurable class-A/class-B transmit DAC for transceiver emission and power consumption control. Broadcom Corporation, McAndrews Held & Malloy, July 15, 2003: US06594304 (65 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 ...


66
Richard M Mathis: Electronic gaming apparatus and method. Adam H Crosby Heafey Roach & May Tachner, April 25, 2000: US06053813 (64 worldwide citation)

A method for operating a microprocessor controlled, reel type slot machine in which payoff is determined before a final game outcome is displayed to a player. A pre-defined count of random numbers is generated and presented to a digital filter having tap outputs which correspond to paytable payline ...


67
Jonathan Herman Fischer, Lane Allen Smith: Recursive digital filter with reset. Lucent Technologies, William H Bollman, December 26, 2000: US06167415 (64 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 ...


68
Jonathan D Coker, Francois B Dolivo, Richard L Galbraith, Wolfgang H Schott, Pablo A Ziperovich: Method and apparatus for digital filter control in a partial-response maximum-likelihood disk drive system. International Business Machines Corporation, Joan Pennington, Richard E Billion, Bradley A Forrest, June 15, 1993: US05220466 (63 worldwide citation)

A method and apparatus are provided for controlling a digital filter function included in a data path within gain and timing control loops of a PRML magnetic recording channel. The digital filter function is removed from the data path during an acquisition mode and the digital filter function is res ...


69
Ryoichi Miyamoto, Yoshio Itoh, Yoshikazu Nakano, Mitsuo Tsujikado, Kenichiro Hosoda: Double-talk detection in an echo canceller. Oki Electric, Spencer & Frank, January 16, 1990: US04894820 (63 worldwide citation)

In a method and apparatus for double-talk detection in an echo canceller that uses an adaptive digital filter to estimate, from a received signal and a transmitted signal to which an echo signal of the received signal is added, the characteristics of an echo path and generate a simulated echo signal ...


70
Koji Takano, Fumiaki Nagao: Digital filters. Sanyo Electric, Cantor Colburn, August 21, 2001: US06279021 (63 worldwide citation)

A digital filter is provided with a plurality of selectors. Switchover from one selector to another switches the digital filter operation between its separation filter function and synthesis filter function. The digital filter is constructed mainly with a multiplier, an accumulator, and an adder-sub ...



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