BE848776R - SELECTIVE SIGNAL RECEIVER FOR COMMUNICATION SYSTEMS, ESPECIALLY TELEPHONY SYSTEMS - Google Patents

SELECTIVE SIGNAL RECEIVER FOR COMMUNICATION SYSTEMS, ESPECIALLY TELEPHONY SYSTEMS

Info

Publication number
BE848776R
BE848776R BE2055485A BE2055485A BE848776R BE 848776 R BE848776 R BE 848776R BE 2055485 A BE2055485 A BE 2055485A BE 2055485 A BE2055485 A BE 2055485A BE 848776 R BE848776 R BE 848776R
Authority
BE
Belgium
Prior art keywords
systems
signal receiver
selective signal
communication systems
especially telephony
Prior art date
Application number
BE2055485A
Other languages
French (fr)
Inventor
W Ohl
H Ball
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 filed Critical
Application granted granted Critical
Publication of BE848776R publication Critical patent/BE848776R/en

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Telephone Function (AREA)
  • Electronic Switches (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
BE2055485A 1975-11-27 1976-11-26 SELECTIVE SIGNAL RECEIVER FOR COMMUNICATION SYSTEMS, ESPECIALLY TELEPHONY SYSTEMS BE848776R (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2553258A DE2553258C3 (en) 1975-11-27 1975-11-27 Circuit arrangement for a digital multi-frequency character receiver

Publications (1)

Publication Number Publication Date
BE848776R true BE848776R (en) 1977-05-26

Family

ID=5962770

Family Applications (1)

Application Number Title Priority Date Filing Date
BE2055485A BE848776R (en) 1975-11-27 1976-11-26 SELECTIVE SIGNAL RECEIVER FOR COMMUNICATION SYSTEMS, ESPECIALLY TELEPHONY SYSTEMS

Country Status (8)

Country Link
BE (1) BE848776R (en)
CA (1) CA1078980A (en)
CH (1) CH601955A5 (en)
DE (1) DE2553258C3 (en)
ES (1) ES453636A1 (en)
FR (1) FR2333398A1 (en)
GB (1) GB1545254A (en)
ZA (1) ZA766727B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7903346A (en) * 1979-04-27 1980-10-29 Bell Telephone Mfg DIGITAL SIGNALING SYSTEM.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3912869A (en) * 1973-11-21 1975-10-14 Tel Tone Corp Multifrequency-to-digital converter

Also Published As

Publication number Publication date
ES453636A1 (en) 1977-11-16
FR2333398A1 (en) 1977-06-24
DE2553258B2 (en) 1979-10-25
DE2553258A1 (en) 1977-06-02
FR2333398B1 (en) 1982-10-22
CA1078980A (en) 1980-06-03
DE2553258C3 (en) 1980-07-03
ZA766727B (en) 1977-10-26
CH601955A5 (en) 1978-07-14
GB1545254A (en) 1979-05-02

Similar Documents

Publication Publication Date Title
ZA744859B (en) Method for frequency-recognition in selective signal receivers for use in telecommunication, particularly telephone systems
FR2290797A1 (en) RECEIVER FOR TRANSMISSION NETWORK, ESPECIALLY RADIO
BE867158A (en) PARTIAL MULTIPLETS RECEPTION DEVICE FOR DIGITAL COMMUNICATIONS SYSTEMS
HK44177A (en) Selective signal receiver for use in telecommunication, particularly telephone systems
BE857139A (en) COLLECTIVE COMMUNICATION CIRCUIT OR CONFERENCE CIRCUIT FOR TELEPHONY MODULATED BY ENCODED PULSES
BE848776R (en) SELECTIVE SIGNAL RECEIVER FOR COMMUNICATION SYSTEMS, ESPECIALLY TELEPHONY SYSTEMS
BE818727R (en) SELECTIVE SIGNAL RECEIVER FOR COMMUNICATION SYSTEMS
BE798984A (en) TELEPHONE COMMUNICATION SYSTEM
FR1182387A (en) Signal transmission system, especially for telephone calls
AT273244B (en) Speech-protected, frequency-selective signal receiver for telecommunications, especially telephone systems
FR2324182A1 (en) CIRCUIT FOR SELECTIVE SIGNAL RECEIVER, IN PARTICULAR FOR TELEPHONE SYSTEMS
SE7600088L (en) RADIO COMMUNICATION TELEPHONE FOR ARMED VEHICLES.
FR2307402A1 (en) MULTI-FREQUENCY SIGNAL RECEIVER
BR7708728A (en) ACUSTIC CALL RECEIVER CIRCUIT, ESPECIALLY FOR TELEPHONE DEVICES
NO143445C (en) TRANSMITTER / RECEIVER FOR ACOUSTIC BULBS.
IT7821472A0 (en) FREQUENCY SELECTIVE SIGNAL RECEIVER, PROTECTED FROM ACCIDENTAL OPERATION CAUSED BY THE VOICE.
IT7821481A0 (en) FREQUENCY SELECTIVE SIGNAL RECEIVER, PROTECTED FROM ACCIDENTAL OPERATION CAUSED BY THE VOICE.
SE385179B (en) CONNECTION DEVICE FOR MULTIFREQUENCY SIGNAL RECEIVERS IN TELEPHONE SYSTEMS, SEPARATE TELEPHONE SYSTEMS WHICH MAY BE USED FOR DATA TRAFFIC
SE7508032L (en) CONNECTION DEVICE FOR BUTTON-CONTROLLED TELEPHONE, DUPLEX TELEPHONE OR SPEAKER SYSTEMS
NO139195C (en) VOICE-PROTECTED FREQUENCY SELECTED CHARACTER RECEIVER FOR REMOTE COMMUNICATION, SPECIAL TELEPHONE SYSTEM
BE594477A (en) Signal transmission system in particular for telephone calls.
IT7825759A0 (en) DEVICE FOR TRANSMITTING RADIOCOMMUNICATIONS SIGNALS.
IT987979B (en) DEVICE FOR TRANSMISSION OF NUMBERS FOR TELE COMMUNICATION DEVICES, IN PARTICULAR FOR TELEPHONE DEVICES
FR2311460A1 (en) MULTI-FREQUENCY SIGNAL RECEIVER
AU486469B2 (en) Selective signal receiver for use in telecommunication, particularly telephone systems