FR2368843A1 - Multi-frequency signal generator for telephone - has switching circuit and summing circuit to provide dialling signals - Google Patents
Multi-frequency signal generator for telephone - has switching circuit and summing circuit to provide dialling signalsInfo
- Publication number
- FR2368843A1 FR2368843A1 FR7631827A FR7631827A FR2368843A1 FR 2368843 A1 FR2368843 A1 FR 2368843A1 FR 7631827 A FR7631827 A FR 7631827A FR 7631827 A FR7631827 A FR 7631827A FR 2368843 A1 FR2368843 A1 FR 2368843A1
- Authority
- FR
- France
- Prior art keywords
- signals
- circuit
- summing
- telephone
- signal generator
- 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.)
- Granted
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
- H04Q1/453—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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
- H04M1/505—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies signals generated in digital form
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Meter Arrangements (AREA)
- Interface Circuits In Exchanges (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
A multifrequency signal generator can provide a signal made up of the sum of sinusoidal signals with different frequencies. It is used to transmit dialling signals between two telephone exchanges. The generator has a switching circuit (CC) and a summing and filtering circuit (SF). The circuit receives up to seven rectangular signals (FE1,...,FE7) with separate frequency for each. The signals (FE1,...,FE7) are taken to seven gates (NB1,...NB7). Each gate (NB1,...,NB7) also receives a control signal from a switch (CD1,...,CD7) and supplies two signals (ON1, OB1; ....: ON7, OB7) to the summing and filtering circuit (SF). The summing and filtering circuit (SF) produces the summed frequencies signal (FS).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7631827A FR2368843A1 (en) | 1976-10-22 | 1976-10-22 | Multi-frequency signal generator for telephone - has switching circuit and summing circuit to provide dialling signals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7631827A FR2368843A1 (en) | 1976-10-22 | 1976-10-22 | Multi-frequency signal generator for telephone - has switching circuit and summing circuit to provide dialling signals |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2368843A1 true FR2368843A1 (en) | 1978-05-19 |
FR2368843B1 FR2368843B1 (en) | 1982-07-23 |
Family
ID=9179084
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7631827A Granted FR2368843A1 (en) | 1976-10-22 | 1976-10-22 | Multi-frequency signal generator for telephone - has switching circuit and summing circuit to provide dialling signals |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2368843A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0122680A1 (en) * | 1983-04-19 | 1984-10-24 | Koninklijke Philips Electronics N.V. | Transmission circuit for a DTMF telephone set |
EP0147791A3 (en) * | 1983-12-26 | 1988-07-13 | Kabushiki Kaisha Toshiba | Dual-tone multiple-frequency-signal generating apparatus |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3946164A (en) * | 1974-05-28 | 1976-03-23 | Gte Automatic Electric Laboratories Incorporated | Precise tone signal generator |
-
1976
- 1976-10-22 FR FR7631827A patent/FR2368843A1/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3946164A (en) * | 1974-05-28 | 1976-03-23 | Gte Automatic Electric Laboratories Incorporated | Precise tone signal generator |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0122680A1 (en) * | 1983-04-19 | 1984-10-24 | Koninklijke Philips Electronics N.V. | Transmission circuit for a DTMF telephone set |
FR2544938A1 (en) * | 1983-04-19 | 1984-10-26 | Philips Nv | TRANSMISSION CIRCUIT FOR DTMF TELEPHONE DEVICE |
EP0147791A3 (en) * | 1983-12-26 | 1988-07-13 | Kabushiki Kaisha Toshiba | Dual-tone multiple-frequency-signal generating apparatus |
Also Published As
Publication number | Publication date |
---|---|
FR2368843B1 (en) | 1982-07-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
TP | Transmission of property |