GB2019146A - A Telephone Band Low-Pass Notch Filter - Google Patents

A Telephone Band Low-Pass Notch Filter

Info

Publication number
GB2019146A
GB2019146A GB7909533A GB7909533A GB2019146A GB 2019146 A GB2019146 A GB 2019146A GB 7909533 A GB7909533 A GB 7909533A GB 7909533 A GB7909533 A GB 7909533A GB 2019146 A GB2019146 A GB 2019146A
Authority
GB
United Kingdom
Prior art keywords
section
band low
telephone band
notch filter
pass notch
Prior art date
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.)
Withdrawn
Application number
GB7909533A
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.)
Alcatel CIT SA
Original Assignee
Alcatel CIT SA
Compagnie Industrielle de Telecommunication CIT Alcatel SA
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.)
Filing date
Publication date
Application filed by Alcatel CIT SA, Compagnie Industrielle de Telecommunication CIT Alcatel SA filed Critical Alcatel CIT SA
Publication of GB2019146A publication Critical patent/GB2019146A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/1217—Frequency selective two-port networks using amplifiers with feedback using a plurality of operational amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H19/00—Networks using time-varying elements, e.g. N-path filters

Landscapes

  • Networks Using Active Elements (AREA)

Abstract

The invention relates to telephone band low-pass filters for use in demodulating PCM. Such filters are formed by two sections (1, 2) connected in cascade, each section including an operational amplifier (A1, A2). A first section is of the low-pass type whose loss at high frequencies is at least 6dB/octave; the second section is a second order asymmetrical notch network with a Cauer response characteristic: the second section may comprise, for example, a double tapped bridge and an operational amplifier. <IMAGE>
GB7909533A 1978-04-07 1979-03-19 A Telephone Band Low-Pass Notch Filter Withdrawn GB2019146A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7810479A FR2422291A1 (en) 1978-04-07 1978-04-07 LOW PASS FILTER FOR TELEPHONE BAND

Publications (1)

Publication Number Publication Date
GB2019146A true GB2019146A (en) 1979-10-24

Family

ID=9206879

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7909533A Withdrawn GB2019146A (en) 1978-04-07 1979-03-19 A Telephone Band Low-Pass Notch Filter

Country Status (15)

Country Link
JP (1) JPS54134952A (en)
AU (1) AU4584779A (en)
BE (1) BE874754A (en)
DE (1) DE2913135A1 (en)
EG (1) EG14776A (en)
FI (1) FI72018C (en)
FR (1) FR2422291A1 (en)
GB (1) GB2019146A (en)
IT (1) IT1118544B (en)
LU (1) LU81123A1 (en)
MX (1) MX144741A (en)
NL (1) NL7902568A (en)
PL (1) PL214706A1 (en)
SE (1) SE435121B (en)
ZA (1) ZA791627B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0776109A3 (en) * 1995-11-24 2000-08-30 Nokia Mobile Phones Ltd. Reception filter for pulse-modulated signals
WO2002003087A1 (en) * 2000-07-05 2002-01-10 Infineon Technologies Ag Amplifier circuit with offset compensation
US6552604B2 (en) * 2001-02-16 2003-04-22 The Boeing Company Digitally tuned analog notch filter circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2677362C1 (en) * 2018-03-14 2019-01-16 федеральное государственное бюджетное образовательное учреждение высшего образования "Донской государственный технический университет" (ДГТУ) Active rc filter
RU2722752C1 (en) * 2019-12-11 2020-06-03 федеральное государственное бюджетное образовательное учреждение высшего образования "Донской государственный технический университет" (ДГТУ) Band-pass filter with independent adjustment of pole frequency, pole attenuation and transmission coefficient

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0776109A3 (en) * 1995-11-24 2000-08-30 Nokia Mobile Phones Ltd. Reception filter for pulse-modulated signals
WO2002003087A1 (en) * 2000-07-05 2002-01-10 Infineon Technologies Ag Amplifier circuit with offset compensation
US6674322B2 (en) 2000-07-05 2004-01-06 Infineon Technologies Ag Amplifier circuit with offset compensation
US6552604B2 (en) * 2001-02-16 2003-04-22 The Boeing Company Digitally tuned analog notch filter circuit

Also Published As

Publication number Publication date
FI791076A (en) 1979-10-08
PL214706A1 (en) 1979-12-17
ZA791627B (en) 1980-04-30
SE435121B (en) 1984-09-03
FR2422291B1 (en) 1982-03-19
FI72018C (en) 1987-03-09
JPS54134952A (en) 1979-10-19
BE874754A (en) 1979-09-12
SE7903088L (en) 1979-10-08
FR2422291A1 (en) 1979-11-02
AU4584779A (en) 1979-10-11
IT1118544B (en) 1986-03-03
NL7902568A (en) 1979-10-09
IT7967695A0 (en) 1979-04-03
EG14776A (en) 1985-03-31
LU81123A1 (en) 1979-11-07
DE2913135A1 (en) 1979-10-18
FI72018B (en) 1986-11-28
MX144741A (en) 1981-11-18

Similar Documents

Publication Publication Date Title
US3755749A (en) Sound reenforcement equalization system
ATE31854T1 (en) DIGITAL SUB-BAND FILTERS.
JPS5298408A (en) Mixer circuit
GB2019146A (en) A Telephone Band Low-Pass Notch Filter
GB1522100A (en) Bidirectional filter circuit
JPS5725731A (en) Hybrid circuit
GB1534319A (en) Electrical filter networks
ATE14056T1 (en) FREQUENCY DEMODULATOR.
JPS5574228A (en) Audio tone adjusting unit
GB2145306A (en) Filter arrangement
JPS57136812A (en) High frequency branching synthesizer
JPS5662415A (en) Dividing network
SU951651A1 (en) Amplitude frequency distortion corrector
JPS5632836A (en) Electronic hybrid circuit
DE3584901D1 (en) DIGITAL FILTER ARRANGEMENT FOR SPLIT SIGNALS IN SUBBAND.
JPS5792907A (en) Phase compensating circuit
SU815868A2 (en) Broad-band active rc-filter
JPS57204622A (en) Variable attenutor
JPS57143716A (en) Equalizer
JPS56140716A (en) Elastic surface wave filter
JPS537158A (en) Wide band amplifier
JPS5555610A (en) Adjusting circuit for frequency characteristic
JPS5317243A (en) Notch filter
JPS54110761A (en) Automatic frequency following type band pass filter
JPS55100717A (en) Frequency split filter

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)