JPS5543677B2 - - Google Patents
Info
- Publication number
- JPS5543677B2 JPS5543677B2 JP5405774A JP5405774A JPS5543677B2 JP S5543677 B2 JPS5543677 B2 JP S5543677B2 JP 5405774 A JP5405774 A JP 5405774A JP 5405774 A JP5405774 A JP 5405774A JP S5543677 B2 JPS5543677 B2 JP S5543677B2
- 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.)
- 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
- H04Q1/46—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Telephonic Communication Services (AREA)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5405774A JPS5543677B2 (US06653308-20031125-C00197.png) | 1974-05-15 | 1974-05-15 | |
| US05/576,961 US4004105A (en) | 1974-05-15 | 1975-05-13 | Multifrequency signal receiver for use in telephone signaling systems or the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5405774A JPS5543677B2 (US06653308-20031125-C00197.png) | 1974-05-15 | 1974-05-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS50147201A JPS50147201A (US06653308-20031125-C00197.png) | 1975-11-26 |
| JPS5543677B2 true JPS5543677B2 (US06653308-20031125-C00197.png) | 1980-11-07 |
Family
ID=12959973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5405774A Expired JPS5543677B2 (US06653308-20031125-C00197.png) | 1974-05-15 | 1974-05-15 |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4004105A (US06653308-20031125-C00197.png) |
| JP (1) | JPS5543677B2 (US06653308-20031125-C00197.png) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5299006A (en) * | 1976-02-16 | 1977-08-19 | Toshiba Corp | Exchanger |
| SE397763B (sv) * | 1976-03-09 | 1977-11-14 | Ericsson Telefon Ab L M | Mottagaranordning for storningskenslig detektering av atminstone tva tonfrekvenser i en inkommande tonsignal |
| JP3105768B2 (ja) * | 1995-08-14 | 2000-11-06 | 松下電器産業株式会社 | 受信回路 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4878804A (US06653308-20031125-C00197.png) * | 1972-01-20 | 1973-10-23 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5138484B1 (US06653308-20031125-C00197.png) * | 1970-07-03 | 1976-10-22 | ||
| CA976675A (en) * | 1972-10-16 | 1975-10-21 | Microsystems International Limited | Dual tone receiver |
| US3914557A (en) * | 1973-04-11 | 1975-10-21 | Bell Telephone Labor Inc | Multifrequency tone detecting arrangement |
| US3851112A (en) * | 1973-04-26 | 1974-11-26 | Gte Automatic Electric Lab Inc | Data detector with voice signal discrimination |
| US3875347A (en) * | 1973-10-01 | 1975-04-01 | Gte Automatic Electric Lab Inc | Multifrequency signal receiver |
-
1974
- 1974-05-15 JP JP5405774A patent/JPS5543677B2/ja not_active Expired
-
1975
- 1975-05-13 US US05/576,961 patent/US4004105A/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4878804A (US06653308-20031125-C00197.png) * | 1972-01-20 | 1973-10-23 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS50147201A (US06653308-20031125-C00197.png) | 1975-11-26 |
| US4004105A (en) | 1977-01-18 |
