GB1341468A – Multi frequency voice receiver
– Google Patents
GB1341468A – Multi frequency voice receiver
– Google Patents
Multi frequency voice receiver
Info
Publication number
GB1341468A
GB1341468A
GB5843171A
GB5843171A
GB1341468A
GB 1341468 A
GB1341468 A
GB 1341468A
GB 5843171 A
GB5843171 A
GB 5843171A
GB 5843171 A
GB5843171 A
GB 5843171A
GB 1341468 A
GB1341468 A
GB 1341468A
Authority
GB
United Kingdom
Prior art keywords
stages
filters
pass
filter
signals
Prior art date
1970-12-23
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
GB5843171A
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 Standard Electric Corp
Original Assignee
International Standard Electric 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.)
1970-12-23
Filing date
1971-12-16
Publication date
1973-12-19
1971-12-16
Application filed by International Standard Electric Corp
filed
Critical
International Standard Electric Corp
1973-12-19
Publication of GB1341468A
publication
Critical
patent/GB1341468A/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
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
H03H11/126—Frequency selective two-port networks using amplifiers with feedback using a single operational amplifier
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
H03K—PULSE TECHNIQUE
H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
H03K5/01—Shaping pulses
H03K5/08—Shaping pulses by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04Q—SELECTING
H04Q1/00—Details of selecting apparatus or arrangements
H04Q1/18—Electrical details
H04Q1/30—Signalling arrangements; Manipulation of signalling currents
H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
Abstract
1341468 Detecting signalling currents INTERNATIONAL STANDARD ELECTRIC CORP 16 Dec 1971 [23 Dec 1970 (2)] 58431/71 Headings H3T H3U and H4R A multitone receiver for use in a telecommunication system has its input from a common control 10 brought to an input amplifier which includes a filter 17 for rejecting all signals below 680 Hz and a following operational amplifier which has a set threshold level of – 22 dBV, Fig. 2 (not shown). Filter 17 consists of cascaded T-filters designed to give a sharp cut-off at 680 Hz, Fig. 5 (not shown). The following filters 20, 22 separate out the high and low tones that make up a valid input signal, the low pass filter having an upper pass frequency of 965 Hz and the high pass filter 22 having a low pass frequency of 1180 Hz. Both filters are similarly constructed of four transistorized cascaded T-stages followed by two cascaded T-stages each with its own operational amplifier, Figs. 6 and 7 (not shown). The separate high and low group signals are passed through a limiter circuit 30 where they are converted into a square wave form if their amplitude passes an acceptance threshold. The circuit, Fig. 9 (not shown). includes a pair of high gain operational amplifiers which have reference voltages applied to their inputs from resistive potential divider chains to give an on/off characteristic. Crosscoupled NAND gates are used to provide the square wave output which is supplied to the groups of band pass filters 40-43, 44-47. Each of the band-pass filters is turned to pass a particular tone frequency and comprises two filter stages in series, each stage comprising an operational amplifier shunted by a twin-T feedback path. The pass frequencies of the stages are not quite the same so that a flat response around the central signal frequency is obtained, Fig. 8 (not shown). The signals from the band pass filters are checked in detector 60 to ensure that they are correctly grouped, i.e. one high and one low, have the correct amplitude and duration. If they are valid D.C. spikes are passed on the respective ones of leads 70-77 into memories 80, 82 which are enabled by a validity pulse on line 84. The signals are stored and passed to decoder 100 which converts the signals into decimal or binary decimal form to supply further equipment. The filter 17 consists of 8 cascaded stages with the resistors in the first five stages descending in magnitude and the resistor in the sixth stage being greater than the first resistor and those in the subsequent stages again are smaller. The capacitors and resistors in filters 20, 22 increase and decrease in value respectively over the first three stages of the filters.
GB5843171A
1970-12-23
1971-12-16
Multi frequency voice receiver
Expired
GB1341468A
(en)
Applications Claiming Priority (2)
Application Number
Priority Date
Filing Date
Title
US10095170A
1970-12-23
1970-12-23
US10095070A
1970-12-23
1970-12-23
Publications (1)
Publication Number
Publication Date
GB1341468A
true
GB1341468A
(en)
1973-12-19
Family
ID=26797737
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB5843171A
Expired
GB1341468A
(en)
1970-12-23
1971-12-16
Multi frequency voice receiver
Country Status (10)
Country
Link
US
(2)
US3710031A
(en)
AU
(1)
AU3645371A
(en)
BE
(1)
BE777085A
(en)
CA
(1)
CA943278A
(en)
CH
(1)
CH547594A
(en)
DE
(1)
DE2163276A1
(en)
ES
(1)
ES398233A1
(en)
FR
(1)
FR2119029B1
(en)
GB
(1)
GB1341468A
(en)
NL
(1)
NL7117637A
(en)
Families Citing this family (16)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2141502B1
(en)
*
1971-06-01
1973-06-29
Ibm France
CA976675A
(en)
*
1972-10-16
1975-10-21
Microsystems International Limited
Dual tone receiver
US3780230A
(en)
*
1972-11-10
1973-12-18
Bell Telephone Labor Inc
Multifrequency tone receiver
DE2409888C2
(en)
*
1973-03-09
1982-08-12
International Standard Electric Corp., 10022 New York, N.Y.
Circuit arrangement for converting sinusoidal input signals into square-wave output signals
US3845249A
(en)
*
1973-03-09
1974-10-29
Itt
Multi-frequency receiver
US3912869A
(en)
*
1973-11-21
1975-10-14
Tel Tone Corp
Multifrequency-to-digital converter
FR2272549A1
(en)
*
1974-05-21
1975-12-19
Gabry Andre
Frequency coded signal receiving and decoding device – has channels with fixed frequency and converting circuits
CA1031086A
(en)
*
1976-03-03
1978-05-09
Northern Electric Company
Method and apparatus for translating multiple frequency signalling
JPS6052380B2
(en)
*
1977-12-20
1985-11-19
日本電気株式会社
Bipolar voltage detection circuit
US4524291A
(en)
*
1983-01-06
1985-06-18
Motorola, Inc.
Transition detector circuit
GB8716144D0
(en)
*
1987-07-09
1987-08-12
British Aerospace
Comparator circuits
JPH03132291A
(en)
*
1989-10-18
1991-06-05
Fujitsu Ltd
Pb signal detection system
DE4407054C2
(en)
*
1994-03-03
1999-11-18
Philips Patentverwaltung
Circuit arrangement for converting sinusoidal signals into rectangular signals
US5488323A
(en)
*
1994-12-14
1996-01-30
United Technologies Corporation
True hysteresis window comparator for use in monitoring changes in switch resistance
US5638435A
(en)
*
1995-05-12
1997-06-10
Telefonaktiebolaget Lm Ericsson
Impulse signal convertor
US5821790A
(en)
*
1996-04-24
1998-10-13
Paragon Electric Company, Inc.
Power line synchronization conditioner
Family Cites Families (10)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3108258A
(en)
*
1960-07-12
1963-10-22
Square D Co
Electronic circuit
NL267564A
(en)
*
1960-08-22
US3140357A
(en)
*
1962-06-28
1964-07-07
Bell Telephone Labor Inc
Multifrequency receiver
BE634162A
(en)
*
1962-07-05
US3288940A
(en)
*
1963-10-24
1966-11-29
Automatic Elect Lab
Multifrequency signal receiver
NL6407780A
(en)
*
1964-07-09
1966-01-10
US3408581A
(en)
*
1965-08-26
1968-10-29
North American Rockwell
Digital suppressed carrier demodulator
US3571523A
(en)
*
1966-12-03
1971-03-16
Int Standard Electric Corp
Receiving device for distinguishing supervisory signals for other audiofrequency signals
US3497723A
(en)
*
1967-04-25
1970-02-24
Eastman Kodak Co
Squaring circuit
US3539731A
(en)
*
1968-11-05
1970-11-10
Bell Telephone Labor Inc
Multifrequency signal receiver
1970
1970-12-23
US
US00100950A
patent/US3710031A/en
not_active
Expired – Lifetime
1970-12-23
US
US00100951A
patent/US3743945A/en
not_active
Expired – Lifetime
1971
1971-12-02
AU
AU36453/71A
patent/AU3645371A/en
not_active
Expired
1971-12-16
GB
GB5843171A
patent/GB1341468A/en
not_active
Expired
1971-12-20
DE
DE19712163276
patent/DE2163276A1/en
active
Pending
1971-12-21
CH
CH1861571A
patent/CH547594A/en
not_active
IP Right Cessation
1971-12-22
NL
NL7117637A
patent/NL7117637A/xx
unknown
1971-12-22
BE
BE777085A
patent/BE777085A/xx
unknown
1971-12-22
CA
CA130,876A
patent/CA943278A/en
not_active
Expired
1971-12-22
ES
ES398233A
patent/ES398233A1/en
not_active
Expired
1971-12-23
FR
FR7146278A
patent/FR2119029B1/fr
not_active
Expired
Also Published As
Publication number
Publication date
US3743945A
(en)
1973-07-03
ES398233A1
(en)
1975-05-01
CH547594A
(en)
1974-03-29
NL7117637A
(en)
1972-06-27
AU3645371A
(en)
1973-06-07
US3710031A
(en)
1973-01-09
BE777085A
(en)
1972-06-22
FR2119029B1
(en)
1976-06-04
CA943278A
(en)
1974-03-05
DE2163276A1
(en)
1972-07-27
FR2119029A1
(en)
1972-08-04
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Legal Events
Date
Code
Title
Description
1974-05-01
PS
Patent sealed [section 19, patents act 1949]
1976-07-14
PLNP
Patent lapsed through nonpayment of renewal fees
