GB1355107A – Digital filters
– Google Patents
GB1355107A – Digital filters
– Google Patents
Digital filters
Info
Publication number
GB1355107A
GB1355107A
GB4350471A
GB4350471A
GB1355107A
GB 1355107 A
GB1355107 A
GB 1355107A
GB 4350471 A
GB4350471 A
GB 4350471A
GB 4350471 A
GB4350471 A
GB 4350471A
GB 1355107 A
GB1355107 A
GB 1355107A
Authority
GB
United Kingdom
Prior art keywords
store
signal
multiplied
stored
registers
Prior art date
1970-12-21
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
GB4350471A
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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.)
1970-12-21
Filing date
1971-09-17
Publication date
1974-06-05
1971-09-17
Application filed by Western Electric Co Inc
filed
Critical
Western Electric Co Inc
1974-06-05
Publication of GB1355107A
publication
Critical
patent/GB1355107A/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
H03H17/0294—Variable filters; Programmable filters
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
H03H17/00—Networks using digital techniques
H03H17/02—Frequency selective networks
H03H17/0283—Filters characterised by the filter structure
H03H17/0286—Combinations of filter structures
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
Abstract
1355107 Active filters WESTERN ELECTRIC CO Inc 17 Sept 1971 [21 Dec 1970] 43504/71 Heading H3U A digital filter for performing p successive digital filtering operations, each of order m, on digitally coded signal samples from each of a sources, comprises a store 112 feeding m cascaded shift registers, e.g. 132, 142 and an arithmetic unit 192 which sequentially receives signals from the store and registers, and which provides an output which is fed back to the store input. Input signal samples are stored in store 112, the output I from which feeds the two registers 132, 142 to produce delayed signal samples X, Y, and a further store 122 produces an output J. The four signals I, X, Y, J are then sequentially fed by gates 114, 134, 144, 124 to arithmetic unit 192 where they are multiplied by predetermined constants and added. Signal X is first multiplied by a constant E, and the product is stored in accumulator 156. Next, the value I is added to the stored product, and the resulting store sum EX + I is transferred to store 112. The signal Y is then similarly multiplied by a constant D, the signal I is added to it, and the resulting signal DY + I transferred from the accumulator to stores 112, 122. Signals CX + J and BY + J, where B, C are further constants, are similarly produced and are stored in 122. Registers 132 and 142 are now shifted, signal J multiplied by a further constant A and the product AJ transferred from accumulator 156 to register 112. The described arrangement is used with series data, but may be modified for parallel data, Fig. 7 (not shown). The various gating signals are derived from a memory unit, Fig. 2 (not shown) and the circuit is equivalent to a second order direct filter, Fig. 1 (not shown).
GB4350471A
1970-12-21
1971-09-17
Digital filters
Expired
GB1355107A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US9974770A
1970-12-21
1970-12-21
Publications (1)
Publication Number
Publication Date
GB1355107A
true
GB1355107A
(en)
1974-06-05
Family
ID=22276425
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB4350471A
Expired
GB1355107A
(en)
1970-12-21
1971-09-17
Digital filters
Country Status (10)
Country
Link
US
(1)
US3706076A
(en)
JP
(1)
JPS5312145B1
(en)
BE
(1)
BE772813A
(en)
CA
(1)
CA937297A
(en)
DE
(1)
DE2146982A1
(en)
FR
(1)
FR2119309A5
(en)
GB
(1)
GB1355107A
(en)
IT
(1)
IT939838B
(en)
NL
(1)
NL7112895A
(en)
SE
(1)
SE364832B
(en)
Families Citing this family (19)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3798560A
(en)
*
1973-01-29
1974-03-19
Bell Telephone Labor Inc
Adaptive transversal equalizer using a time-multiplexed second-order digital filter
IT980928B
(en)
*
1973-04-30
1974-10-10
Cselt Centro Studi Lab Telecom
USER AND INPUT EQUIPMENT TO A PCM CENTRAL FOR HIGH SPEED DATA TRANSMISSION CITA
NL179619C
(en)
*
1974-04-18
1987-05-18
Philips Nv
DIGITAL SIGNAL PROCESSING DEVICE FOR REALIZING PRE-DEFINED TRANSFER CHARACTERISTICS.
FR2295665A1
(en)
*
1974-12-18
1976-07-16
Labo Cent Telecommunicat
MULTI-FREQUENCY DIGITAL SIGNAL RECEIVER
JPS5376726A
(en)
*
1976-12-20
1978-07-07
Toshiba Corp
Synchronizing system digital filter
US4117541A
(en)
*
1977-11-07
1978-09-26
Communications Satellite Corporation
Configurable parallel arithmetic structure for recursive digital filtering
US4354248A
(en)
*
1979-11-28
1982-10-12
Motorola, Inc.
Programmable multifrequency tone receiver
US4467440A
(en)
*
1980-07-09
1984-08-21
Casio Computer Co., Ltd.
Digital filter apparatus with resonance characteristics
JPS57142022A
(en)
*
1981-02-26
1982-09-02
Casio Comput Co Ltd
Resonance characteristic controlling system in digital filter
NL8201344A
(en)
*
1982-03-31
1983-10-17
Philips Nv
DIGITAL TONE CONTROL DEVICE.
US4489416A
(en)
*
1983-03-18
1984-12-18
Rixon, Inc.
Equalization system for modems in a polled arrangement
FR2552904A1
(en)
*
1983-10-03
1985-04-05
Moulin Andre
Calculation processor
FR2555777A1
(en)
*
1983-10-03
1985-05-31
Moulin Andre
Digital filtering processor
US4803647A
(en)
*
1986-05-30
1989-02-07
Rca Licensing Corporation
Sampled data audio tone control apparatus
US4809208A
(en)
*
1987-04-03
1989-02-28
Tektronix, Inc.
Programmable multistage digital filter
GB2209648B
(en)
*
1987-09-10
1991-10-23
Ncr Co
Modem communication system having main and secondary channels
US5586068A
(en)
*
1993-12-08
1996-12-17
Terayon Corporation
Adaptive electronic filter
US20020049799A1
(en)
*
2000-10-24
2002-04-25
Minsheng Wang
Parallel implementation for digital infinite impulse response filter
JP2005512842A
(en)
*
2001-12-14
2005-05-12
グラフィック、パッケージング、コーポレーション
Container, blank for manufacturing the container, and related methods and apparatus
1970
1970-12-21
US
US99747A
patent/US3706076A/en
not_active
Expired – Lifetime
1971
1971-07-30
CA
CA119539A
patent/CA937297A/en
not_active
Expired
1971-09-14
SE
SE11658/71A
patent/SE364832B/xx
unknown
1971-09-17
GB
GB4350471A
patent/GB1355107A/en
not_active
Expired
1971-09-20
BE
BE772813A
patent/BE772813A/en
unknown
1971-09-20
IT
IT70095/71A
patent/IT939838B/en
active
1971-09-20
NL
NL7112895A
patent/NL7112895A/xx
not_active
Application Discontinuation
1971-09-20
FR
FR7133785A
patent/FR2119309A5/fr
not_active
Expired
1971-09-21
DE
DE19712146982
patent/DE2146982A1/en
not_active
Withdrawn
1971-09-21
JP
JP7307571A
patent/JPS5312145B1/ja
active
Pending
Also Published As
Publication number
Publication date
SE364832B
(en)
1974-03-04
IT939838B
(en)
1973-02-10
NL7112895A
(en)
1972-06-23
US3706076A
(en)
1972-12-12
JPS5312145B1
(en)
1978-04-27
DE2146982A1
(en)
1972-07-13
BE772813A
(en)
1972-01-17
CA937297A
(en)
1973-11-20
FR2119309A5
(en)
1972-08-04
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Legal Events
Date
Code
Title
Description
1974-10-09
PS
Patent sealed [section 19, patents act 1949]
1983-04-20
PCNP
Patent ceased through non-payment of renewal fee
