JPS4837005A - - Google Patents
Info
- Publication number
- JPS4837005A JPS4837005A JP47089138A JP8913872A JPS4837005A JP S4837005 A JPS4837005 A JP S4837005A JP 47089138 A JP47089138 A JP 47089138A JP 8913872 A JP8913872 A JP 8913872A JP S4837005 A JPS4837005 A JP S4837005A
- Authority
- JP
- Japan
- 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
- 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
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17812671A | 1971-09-07 | 1971-09-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS4837005A true JPS4837005A (en) | 1973-05-31 |
| JPS5228522B2 JPS5228522B2 (en) | 1977-07-27 |
Family
ID=22651310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP47089138A Expired JPS5228522B2 (en) | 1971-09-07 | 1972-09-07 |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US3699477A (en) |
| JP (1) | JPS5228522B2 (en) |
| BE (1) | BE788462A (en) |
| CA (1) | CA958083A (en) |
| DE (1) | DE2243625C3 (en) |
| ES (1) | ES406799A1 (en) |
| FR (1) | FR2152669B1 (en) |
| GB (1) | GB1411418A (en) |
| IT (1) | IT965227B (en) |
| NL (1) | NL7212067A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5461804A (en) * | 1977-10-26 | 1979-05-18 | Mitsubishi Electric Corp | Information transmitter |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7212510A (en) * | 1972-09-15 | 1974-03-19 | ||
| CA988175A (en) * | 1974-06-14 | 1976-04-27 | Michael C.J. Cowpland | Tone generator |
| US4110568A (en) * | 1976-10-08 | 1978-08-29 | Gte Atea, S.A. | Dual tone multifrequency generator |
| US6326853B1 (en) * | 1999-08-26 | 2001-12-04 | Cypress Semiconductor Corp | Circuitry, architecture and method(s) for phase matching and/or reducing load capacitance, current and/or power consumption in an oscillator |
| US8605889B2 (en) * | 2011-11-18 | 2013-12-10 | Edward D. REGAN | Method and device for encoding characters and routing calls using expanded dual-tone multi-frequency (DTMF) encoding scheme |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3349350A (en) * | 1964-12-04 | 1967-10-24 | Otto E Rittenbach | Frequency step filter |
| US3424870A (en) * | 1965-09-14 | 1969-01-28 | Bell Telephone Labor Inc | Multifrequency signal generator for tone-dialed telephones |
-
0
- BE BE788462D patent/BE788462A/en unknown
-
1971
- 1971-09-07 US US178126A patent/US3699477A/en not_active Expired - Lifetime
-
1972
- 1972-03-23 CA CA137,929A patent/CA958083A/en not_active Expired
- 1972-09-05 NL NL7212067A patent/NL7212067A/xx not_active Application Discontinuation
- 1972-09-06 DE DE2243625A patent/DE2243625C3/en not_active Expired
- 1972-09-06 IT IT52568/72A patent/IT965227B/en active
- 1972-09-06 FR FR7231571A patent/FR2152669B1/fr not_active Expired
- 1972-09-06 GB GB4124872A patent/GB1411418A/en not_active Expired
- 1972-09-07 ES ES406799A patent/ES406799A1/en not_active Expired
- 1972-09-07 JP JP47089138A patent/JPS5228522B2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5461804A (en) * | 1977-10-26 | 1979-05-18 | Mitsubishi Electric Corp | Information transmitter |
Also Published As
| Publication number | Publication date |
|---|---|
| ES406799A1 (en) | 1975-10-16 |
| FR2152669B1 (en) | 1976-03-12 |
| JPS5228522B2 (en) | 1977-07-27 |
| FR2152669A1 (en) | 1973-04-27 |
| CA958083A (en) | 1974-11-19 |
| BE788462A (en) | 1973-01-02 |
| DE2243625A1 (en) | 1973-03-15 |
| NL7212067A (en) | 1973-03-09 |
| DE2243625C3 (en) | 1975-04-17 |
| DE2243625B2 (en) | 1974-08-29 |
| IT965227B (en) | 1974-01-31 |
| GB1411418A (en) | 1975-10-22 |
| US3699477A (en) | 1972-10-17 |