GB1346698A – Digital filter
– Google Patents
GB1346698A – Digital filter
– Google Patents
Digital filter
Info
Publication number
GB1346698A
GB1346698A
GB5645771A
GB5645771A
GB1346698A
GB 1346698 A
GB1346698 A
GB 1346698A
GB 5645771 A
GB5645771 A
GB 5645771A
GB 5645771 A
GB5645771 A
GB 5645771A
GB 1346698 A
GB1346698 A
GB 1346698A
Authority
GB
United Kingdom
Prior art keywords
signals
input
store
sign
output
Prior art date
1970-12-17
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB5645771A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1970-12-17
Filing date
1971-12-06
Publication date
1974-02-13
1971-12-06
Application filed by International Business Machines Corp
filed
Critical
International Business Machines Corp
1974-02-13
Publication of GB1346698A
publication
Critical
patent/GB1346698A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
H03H17/00—Networks using digital techniques
H03H17/02—Frequency selective networks
H03H17/0223—Computation saving measures; Accelerating measures
H03H17/0225—Measures concerning the multipliers
H03H17/0226—Measures concerning the multipliers comprising look-up tables
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
H03H17/00—Networks using digital techniques
H03H17/02—Frequency selective networks
H03H17/04—Recursive filters
H03H17/0405—Recursive filters comprising a ROM addressed by the input and output data signals
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
H03H17/00—Networks using digital techniques
H03H17/02—Frequency selective networks
H03H17/06—Non-recursive filters
H03H17/0607—Non-recursive filters comprising a ROM addressed by the input data signals
Abstract
1346698 Active filters INTERNATIONAL BUSINESS MACHINES CORP 6 Dec 1971 [17 Dec 1970] 56457/71 Heading H3U A digital filter comprises a store containing numerical values, addressing means responsive to address digits derived from the input signals to read from the store a succession of selected numerical values, and arithmetic means to sum each succession of values. A recursive filter, Fig. 3, comprises a forward path delay C3 connected to input X and feedback delays C1, C2 which provide, suitable address signals for store 12 which holds 16 words each of B bits. The B bit output is applied in parallel to an adder 14 which is part of a loop comprising a clock controlled gate 16 and halver 18. If, in order to deal with negative signals, a modified two’s complement internal code (C1M) is used for the signals, then the store need only contain eight addresses with provision for changing the sign of the output to give the positive or negative value of the contents. This sign changing is effected by the provision of EXCLUSIVE-OR gates XOR1 ….. XOR4 which, whenever a «1» occurs on line 1, inverts the sign applied to the other input. The arrangement may be used for delta modulated signals by including suitable converters in the input and output, Fig. 4 (not shown). A non-recursive arrangement is also described, Fig. 5 (not shown).
GB5645771A
1970-12-17
1971-12-06
Digital filter
Expired
GB1346698A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
FR7047123A
FR2118410A5
(en)
1970-12-17
1970-12-17
Publications (1)
Publication Number
Publication Date
GB1346698A
true
GB1346698A
(en)
1974-02-13
Family
ID=9066516
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB5645771A
Expired
GB1346698A
(en)
1970-12-17
1971-12-06
Digital filter
Country Status (5)
Country
Link
US
(1)
US3777130A
(en)
JP
(1)
JPS5330972B1
(en)
DE
(1)
DE2158378C2
(en)
FR
(1)
FR2118410A5
(en)
GB
(1)
GB1346698A
(en)
Families Citing this family (49)
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Publication date
Assignee
Title
FR2238299B1
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1973-07-20
1977-12-23
Trt Telecom Radio Electr
FR2255754B1
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1973-12-11
1978-03-17
Ibm France
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1973-12-28
1978-09-08
Ibm France
US4025772A
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1974-03-13
1977-05-24
James Nickolas Constant
Digital convolver matched filter and correlator
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1974-06-21
1976-01-16
Ibm France
DIGITAL FREQUENTIAL FILTER
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1974-12-18
1976-06-22
Philips Nv
DEVICE CONTAINING AN INTEGRATED DIGITAL SIGNAL PROCESSING DEVICE.
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1975-05-26
1976-11-30
Philips Nv
DIGITAL FILTER.
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1975-09-29
1976-11-23
The United States Of America As Represented By The Secretary Of The Air Force
Combinatorial digital filter
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1976-06-11
1977-06-07
International Business Machines Corporation
Apparatus and method for generating a data code with a spectral null
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1977-02-04
1978-09-01
Labo Cent Telecommunicat
DIGITAL FILTER
JPS54554A
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1977-06-03
1979-01-05
Hitachi Ltd
Digital filter
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1977-07-01
1978-11-14
Ncr Corporation
Cascaded recursive digital filter
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1978-02-15
1985-08-10
株式会社日立製作所
digital filter
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1978-05-10
1981-03-10
Nippon Electric Co., Ltd.
Digital filter
JPS5571316A
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*
1978-11-24
1980-05-29
Hitachi Ltd
Recursive digital filter
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1978-12-14
1980-07-15
Bell Telephone Laboratories, Incorporated
Digital filters with control of limit cycles
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1978-12-18
1980-10-14
James N. Constant
Recursive filter
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1979-05-16
1980-11-28
Nec Corp
Digital multiplier
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1979-11-28
1982-10-12
Motorola, Inc.
Programmable multifrequency tone receiver
FR2495857B1
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1980-08-27
1987-11-27
Petit Jean
RECURRING DIGITAL FILTER OF OVERSAMPLE IN DISTRIBUTED ARITHMETICS
FR2489554B1
(en)
*
1980-08-27
1986-10-31
Petit Jean
DIGITAL PROCESSING CIRCUIT IN DISTRIBUTED ARITHMETICS USING MULTIPLEXERS AT THE INPUT OF A MEMORY
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1980-10-01
1985-05-21
Motorola, Inc.
Universal paging device with power conservation
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1980-10-01
1992-05-26
Motorola, Inc.
Multi system decoding receiver
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*
1980-11-14
1983-02-15
Burlage Donald W
Digital equalizer for high speed communication channels
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1981-11-06
1983-12-20
Rca Corporation
Digital signal processor with symmetrical transfer characteristic
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*
1981-03-31
1983-11-08
Motorola, Inc.
Signal synchronization system
GB2108736B
(en)
*
1981-10-27
1984-12-12
Standard Telephones Cables Ltd
Sum of products multiplier
DE3144456A1
(en)
*
1981-11-09
1983-05-19
Siemens AG, 1000 Berlin und 8000 München
Transversal filter for converting digital signals
GB8400791D0
(en)
*
1984-01-12
1984-02-15
British Telecomm
Digital filter
GB8427165D0
(en)
*
1984-10-26
1984-12-05
British Telecomm
Adaptive recognising device
JPS61186012A
(en)
*
1985-02-13
1986-08-19
Sony Corp
Waveform shaping circuit for transmitter
US4733403A
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*
1986-05-12
1988-03-22
Motorola, Inc.
Digital zero IF selectivity section
IT1227520B
(en)
*
1988-12-06
1991-04-12
Sgs Thomson Microelectronics
PROGRAMMABLE DIGITAL FILTER
US5150317A
(en)
*
1989-01-11
1992-09-22
The Boeing Company
Adaptive digital filter which is responsive to the rate of change of an input signal
US5089981A
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*
1989-04-24
1992-02-18
Audio Precision, Inc.
Hybrid form digital filter
US5189634A
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*
1991-03-28
1993-02-23
Northern Telecom Limited
Digital signal processing apparatus for detecting a frequency component of digital signals
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1995-10-19
2002-10-22
Rambus Inc.
Protocol for communication with dynamic memory
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1997-03-14
1999-11-23
Xilinx, Inc.
Method for configuring an FPGA for large FFTs and other vector rotation computations
US6266379B1
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1997-06-20
2001-07-24
Massachusetts Institute Of Technology
Digital transmitter with equalization
DE19738226C1
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*
1997-09-02
1999-02-04
Telefunken Microelectron
Digital, tunable filter arrangement
US6021423A
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*
1997-09-26
2000-02-01
Xilinx, Inc.
Method for parallel-efficient configuring an FPGA for large FFTS and other vector rotation computations
US6167416A
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1997-09-26
2000-12-26
Xilinx, Inc.
System and method for RAM-partitioning to exploit parallelism of radix-2 elements in FPGAS
GB2363245B
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1999-04-21
2003-07-16
Seagate Technology Llc
Adaptive h-infinity hardware controller for disc drive actuator control
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1999-07-21
2002-08-20
Xilinx, Inc.
FPGA implemented bit-serial multiplier and infinite impulse response
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1999-10-29
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Xilinx Inc.
2-dimensional discrete cosine transform using a polynomial transform
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2003-11-06
2008-01-08
Telefonaktiebolaget L M Ericsson (Publ)
Split radix multiplication
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2004-03-10
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Allred Daniel J.
Distributed arithmetic adaptive filter and method
CN101257288B
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*
2008-04-11
2010-06-02
哈尔滨理工大学
Finite impulse response digit filter capable of configuring parameter
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2010-06-07
2016-01-21
Dräger Safety AG & Co. KGaA
Thermal camera
Family Cites Families (9)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3446949A
(en)
*
1966-10-28
1969-05-27
Hewlett Packard Co
Signal-to-noise ratio enhancement methods and means
US3370292A
(en)
*
1967-01-05
1968-02-20
Raytheon Co
Digital canonical filter
US3521041A
(en)
*
1967-07-19
1970-07-21
Ibm
Digital filters
US3522546A
(en)
*
1968-02-29
1970-08-04
Bell Telephone Labor Inc
Digital filters
US3543012A
(en)
*
1968-07-10
1970-11-24
Us Navy
Universal digital filter and function generator
US3579102A
(en)
*
1968-09-30
1971-05-18
John F Keating
Apparatus for testing successive ones of a plurality of electrical components
US3619586A
(en)
*
1968-11-25
1971-11-09
Research Corp
Universal digital filter for linear discrete systems
US3579109A
(en)
*
1969-04-02
1971-05-18
Gen Dynamics Corp
Automatic equalizer for digital data transmission systems
FR2116224B1
(en)
*
1970-10-29
1974-10-31
Ibm France
1970
1970-12-17
FR
FR7047123A
patent/FR2118410A5/fr
not_active
Expired
1971
1971-11-25
DE
DE2158378A
patent/DE2158378C2/en
not_active
Expired
1971-12-06
GB
GB5645771A
patent/GB1346698A/en
not_active
Expired
1971-12-07
JP
JP9834571A
patent/JPS5330972B1/ja
active
Pending
1971-12-15
US
US00208345A
patent/US3777130A/en
not_active
Expired – Lifetime
Also Published As
Publication number
Publication date
DE2158378C2
(en)
1982-05-27
US3777130A
(en)
1973-12-04
JPS5330972B1
(en)
1978-08-30
FR2118410A5
(en)
1972-07-28
DE2158378A1
(en)
1972-06-22
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Legal Events
Date
Code
Title
Description
1974-07-03
PS
Patent sealed [section 19, patents act 1949]
1987-07-22
PCNP
Patent ceased through non-payment of renewal fee
