GB1402119A – Telecommunications characteristics receivers
– Google Patents
GB1402119A – Telecommunications characteristics receivers
– Google Patents
Telecommunications characteristics receivers
Info
Publication number
GB1402119A
GB1402119A
GB4245972A
GB4245972A
GB1402119A
GB 1402119 A
GB1402119 A
GB 1402119A
GB 4245972 A
GB4245972 A
GB 4245972A
GB 4245972 A
GB4245972 A
GB 4245972A
GB 1402119 A
GB1402119 A
GB 1402119A
Authority
GB
United Kingdom
Prior art keywords
frequency
circuit
tone
count
gates
Prior art date
1971-09-14
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
GB4245972A
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.)
Siemens AG
Original Assignee
Siemens AG
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.)
1971-09-14
Filing date
1972-09-13
Publication date
1975-08-06
1971-09-14
Priority claimed from DE19712145886
external-priority
patent/DE2145886C2/en
1971-11-11
Priority claimed from DE19712156123
external-priority
patent/DE2156123C2/en
1972-09-13
Application filed by Siemens AG
filed
Critical
Siemens AG
1975-08-06
Publication of GB1402119A
publication
Critical
patent/GB1402119A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
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
H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
Abstract
1402119 Voice frequency receivers; automatic exchange systems SIEMENS AG 13 Sept 1972 [14 Sept 1971 11 Nov 1971] 42459/72 Headings H4R and H4K A tone receiver includes a speech protection and tone frequency determining circuit which counts clock pulses during two consecutive half-cycles of a tone and only verifies the tone if the counts correspond within limits, the count for the first half-cycle or the complete cycle being used to indicate the tone frequency. The application is to two tone receivers, e.g. for push button dialling signals and one such circuit may be provided for each frequency band (Fig. 1, not shown) or alternatively one circuit is shared between the two frequency bands and is used consecutively therefor via a changeover switch (Fig. 4, not shown). In one circuit a forward counting counter RZ1-RZ4, Fig. 2, is used which is driven by clock pulses. Gates M1 and M2 define a range of counts in which the negative transistion should occur for a particular frequency and gates E1 and E2 define the complete cycle count longer for the same frequency, a signal being produced at output Q of bi-stable device FF4 if the half and fiull wave transitions occur in the correct count ranges. In practice a plurality of circuits DS are provided in conjunction with the counter, one for each possible frequency to be detected by the circuit. A second circuit uses a backwards and forwards counter, Fig. 3, and pairs of gates U1 O1 … U4, 04 are used to define the half-cycle count ranges for a respective frequency to be detected. The speech protection is afforded by gates G1, G2 which define counts 125 above and below zero respectively. The counter is triggered by a positive going transition and for a valid frequency the count G1 should be passed through twice without the count G2 being passed. Fig. 5 (not shown), illustrates the modifications by way of additions to the arrangement of Fig. 3, where the same circuit is to be used consecutively for both frequency bands and assuming a 2 out of 8 code. Essentially two sets of bi-stable devices HSB are provided, and one set is enabled for each position of a changeover switch which couples outputs of one of the two clipped band passed waveforms to the circuit.
GB4245972A
1971-09-14
1972-09-13
Telecommunications characteristics receivers
Expired
GB1402119A
(en)
Applications Claiming Priority (2)
Application Number
Priority Date
Filing Date
Title
DE19712145886
DE2145886C2
(en)
1971-09-14
1971-09-14
Voice-protected, frequency-selective signal receiver for telecommunications, in particular telephone systems
DE19712156123
DE2156123C2
(en)
1971-11-11
1971-11-11
Frequency-selective character receiver for telecommunications, in particular telephone systems
Publications (1)
Publication Number
Publication Date
GB1402119A
true
GB1402119A
(en)
1975-08-06
Family
ID=25761724
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB4245972A
Expired
GB1402119A
(en)
1971-09-14
1972-09-13
Telecommunications characteristics receivers
Country Status (9)
Country
Link
AT
(1)
AT328516B
(en)
BE
(1)
BE788813A
(en)
CH
(1)
CH545569A
(en)
FR
(1)
FR2153943A5
(en)
GB
(1)
GB1402119A
(en)
IT
(1)
IT967367B
(en)
LU
(1)
LU66057A1
(en)
NL
(1)
NL7212486A
(en)
SE
(1)
SE397461B
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
EP0008160A1
(en)
*
1978-08-10
1980-02-20
Motorola, Inc.
Programmable digital tone detector
0
BE
BE788813D
patent/BE788813A/en
unknown
1972
1972-08-17
AT
AT713372A
patent/AT328516B/en
not_active
IP Right Cessation
1972-08-21
CH
CH545569D
patent/CH545569A/xx
not_active
IP Right Cessation
1972-09-11
FR
FR7232114A
patent/FR2153943A5/fr
not_active
Expired
1972-09-12
LU
LU66057D
patent/LU66057A1/xx
unknown
1972-09-12
IT
IT2907772A
patent/IT967367B/en
active
1972-09-13
SE
SE1182472A
patent/SE397461B/en
unknown
1972-09-13
GB
GB4245972A
patent/GB1402119A/en
not_active
Expired
1972-09-14
NL
NL7212486A
patent/NL7212486A/xx
not_active
Application Discontinuation
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
EP0008160A1
(en)
*
1978-08-10
1980-02-20
Motorola, Inc.
Programmable digital tone detector
Also Published As
Publication number
Publication date
ATA713372A
(en)
1975-06-15
AT328516B
(en)
1976-03-25
IT967367B
(en)
1974-02-28
NL7212486A
(en)
1973-03-16
CH545569A
(en)
1974-01-31
LU66057A1
(en)
1973-01-17
BE788813A
(en)
1973-03-14
FR2153943A5
(en)
1973-05-04
SE397461B
(en)
1977-10-31
Similar Documents
Publication
Publication Date
Title
GB1528584A
(en)
1978-10-11
Digital single signal line full duplex method and apparatus
GB1501726A
(en)
1978-02-22
Detecting the presence of speech band activity in telephone connections
GB1490531A
(en)
1977-11-02
Digital attenuators
GB1460995A
(en)
1977-01-06
Method for frequency-recognition in selective signal receivers for use in telecommunication particularly telephone systems selective signal receiver for use in telecommunication
GB1402119A
(en)
1975-08-06
Telecommunications characteristics receivers
GB1460996A
(en)
1977-01-06
Selective signal receiver for use in telecommunication particu larly telephone systems
GB1300330A
(en)
1972-12-20
Digital pulse identification system
ES401437A1
(en)
1975-10-01
Decoding of frequency coded signals
US4021620A
(en)
1977-05-03
Multifrequency signal receiver with digital tone receiver
JPS5245813A
(en)
1977-04-11
Wireless telephone system
GB970315A
(en)
1964-09-16
Circuit arrangement for sending and receiving code signals
GB1460994A
(en)
1977-01-06
Circuit arrangement for a selective signal receiver particularly for use in telephone systems
IT8019986A1
(en)
1981-08-18
DIGITAL CALL RECEIVER, FOR THE RECEPTION OF PULSIVELY CODED TONE SIGNALS
GB1318499A
(en)
1973-05-31
Multifrequency receiver
GB1342904A
(en)
1974-01-10
Multifrequency data receivers
JPS5228839A
(en)
1977-03-04
Concentrated constant type delay line
RU1809544C
(en)
1993-04-15
Device for operating a communication channel on a multi-channel basis
JPS535511A
(en)
1978-01-19
Digital multi-frequency receiver
ES416871A1
(en)
1976-02-16
Signal routing device for a parallel transmission and/or switching network of coded signals
GB1393323A
(en)
1975-05-07
Multifrequency receivers
SU886273A1
(en)
1981-11-30
Device for automatic selection of channel at diversity reception
US4263556A
(en)
1981-04-21
Monostable system
GB1347251A
(en)
1974-02-27
Electric impulse transmitters
FR2357118A1
(en)
1978-01-27
Bilateral digital radio communications system – has OR=gate which eliminates one of binary signals and accepts received binary signal
SE7507850L
(en)
1976-01-12
RADIO TRANSMISSION RECEIVER WITH MORE ONE RADIO FREQUENCY CHANNEL FOR DIGITAL NUMBER TRANSMISSION
Legal Events
Date
Code
Title
Description
1975-12-17
PS
Patent sealed
1985-05-15
PCNP
Patent ceased through non-payment of renewal fee
