GB1378818A - Digital tone signal generator - Google Patents
Digital tone signal generatorInfo
- Publication number
- GB1378818A GB1378818A GB1396572A GB1396572A GB1378818A GB 1378818 A GB1378818 A GB 1378818A GB 1396572 A GB1396572 A GB 1396572A GB 1396572 A GB1396572 A GB 1396572A GB 1378818 A GB1378818 A GB 1378818A
- Authority
- GB
- United Kingdom
- Prior art keywords
- registers
- stage
- signal generator
- field effect
- ones
- 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.)
- Expired
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
- H04Q1/4575—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 which are transmitted in digital form
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Input From Keyboards Or The Like (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Devices For Supply Of Signal Current (AREA)
Abstract
1378818 Counting apparatus ROCKWELL INTERNATIONAL CORP 24 March 1972 [27 Aug 1971] 13965/72 Heading G4D [Also in Division H4] A digital signal generator comprises a clockdriven variable ratio frequency dividing counter stepping a register arranged to cyclically generate digital representation of a waveform shape. In the dual tone telephone number sender shown depression of a push-button on a panel 2 enables via a diode matrix one wire each of sets 5 and 6. Counters 9 and 10, driven from a clock 72, on reaching predetermined counts recognized by AND gates 16 and 20 are set to counts characteristic of the depressed key and step associated shift registers 14 and 23, the frequency of stepping of the registers being characteristic of the key. Each register has its last stage connected back to its first stage such that with four stage registers four "ones" followed by four "zeros" pass through the registers. The ones enables drivers 36 to 39 and 45 to 48 supplying power to resistors having values 2R and R and having their outputs combined to produce at 4 the required dual tone digital representations. The drivers and logic gates may be field effect transistor circuits. The circuits may be integrated. High voltage P- channel devices, N-channel, silicon gate, CMOS and other types of field effect transistors and bipolar devices are suggested alternatives.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17552471A | 1971-08-27 | 1971-08-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1378818A true GB1378818A (en) | 1974-12-27 |
Family
ID=22640563
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1396572A Expired GB1378818A (en) | 1971-08-27 | 1972-03-24 | Digital tone signal generator |
Country Status (4)
Country | Link |
---|---|
JP (1) | JPS535002B2 (en) |
BE (1) | BE782055A (en) |
FR (1) | FR2151815A5 (en) |
GB (1) | GB1378818A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3941942A (en) * | 1974-01-02 | 1976-03-02 | Motorola, Inc. | Two of eight tone encoder |
FR2280141A1 (en) * | 1974-07-26 | 1976-02-20 | Materiel Telephonique | System of signalling between data processing centres - has seven frequency divider sub-assemblies, decoders and filters |
US4061886A (en) * | 1975-09-29 | 1977-12-06 | Mostek Corporation | Dual tone multiple frequency generator |
US4087638A (en) * | 1976-10-01 | 1978-05-02 | Telaris Telecommunications Inc. | DTMF Communication system |
JPS53145507A (en) * | 1977-05-25 | 1978-12-18 | Fujitsu Ltd | Pb signal transmitting system |
-
1972
- 1972-03-24 GB GB1396572A patent/GB1378818A/en not_active Expired
- 1972-04-13 BE BE782055A patent/BE782055A/en unknown
- 1972-05-29 FR FR7219139A patent/FR2151815A5/fr not_active Expired
- 1972-08-01 JP JP7759772A patent/JPS535002B2/ja not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE782055A (en) | 1972-07-31 |
JPS4831808A (en) | 1973-04-26 |
JPS535002B2 (en) | 1978-02-23 |
FR2151815A5 (en) | 1973-04-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1167272A (en) | Improvement to Key Generators for Cryptographic Devices | |
GB1236961A (en) | Improvements in or relating to electric impulse transmitters | |
US3046526A (en) | scantlin | |
ES357212A1 (en) | Method of producing tones of an equally tempered scale | |
GB1378818A (en) | Digital tone signal generator | |
US4065915A (en) | Binary counting system | |
GB1272687A (en) | Counters | |
US3818441A (en) | Key input circuit system for electronic apparatus | |
FR2282752B1 (en) | ||
GB976995A (en) | Control circuit | |
US4231024A (en) | Device for a digital arithmetic processing apparatus | |
US3962701A (en) | Coded counting sequence and logic implementation thereof to drive a display pattern | |
GB1018075A (en) | Circuit arrangement for generating a multiphase signal | |
GB1506234A (en) | Complementary field effect transistor logic circuits | |
US3899691A (en) | Driving circuits for electronic watches | |
GB1338983A (en) | Electronic watches | |
JPS6130451B2 (en) | ||
US4187670A (en) | Time signal generator circuit for use in an electronic timepiece | |
US4691331A (en) | Self-correcting frequency dividers | |
US3716725A (en) | Ring counter | |
GB991765A (en) | Incremental integrator and differential analyser | |
US3921384A (en) | Digital watch having dual purpose ring counter | |
US3922568A (en) | Driving circuits for electronic watches | |
GB861509A (en) | ||
GB1024025A (en) | Digital comparison member |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PE20 | Patent expired after termination of 20 years |