ZA708418B - Improvements in or relating to tone signalling apparatus - Google Patents
Improvements in or relating to tone signalling apparatusInfo
- Publication number
- ZA708418B ZA708418B ZA708418A ZA708418A ZA708418B ZA 708418 B ZA708418 B ZA 708418B ZA 708418 A ZA708418 A ZA 708418A ZA 708418 A ZA708418 A ZA 708418A ZA 708418 B ZA708418 B ZA 708418B
- Authority
- ZA
- South Africa
- Prior art keywords
- relating
- signalling apparatus
- tone signalling
- tone
- signalling
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/18—Service support devices; Network management devices
- H04W88/185—Selective call encoders for paging networks, e.g. paging centre devices
- H04W88/188—Selective call encoders for paging networks, e.g. paging centre devices using frequency address codes
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
- G08C19/12—Electric signal transmission systems in which the signal transmitted is frequency or phase of ac
- G08C19/14—Electric signal transmission systems in which the signal transmitted is frequency or phase of ac using combination of fixed frequencies
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/30—Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Filters And Equalizers (AREA)
- Mobile Radio Communication Systems (AREA)
- Selective Calling Equipment (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US887971A US3649770A (en) | 1969-12-24 | Tone signaling system |
Publications (1)
Publication Number | Publication Date |
---|---|
ZA708418B true ZA708418B (en) | 1972-07-26 |
Family
ID=25392253
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ZA708418A ZA708418B (en) | 1969-12-24 | 1970-12-14 | Improvements in or relating to tone signalling apparatus |
Country Status (8)
Country | Link |
---|---|
BE (1) | BE760766A (de) |
CA (1) | CA928818A (de) |
DE (1) | DE2062957A1 (de) |
ES (1) | ES386797A1 (de) |
FR (1) | FR2072054B1 (de) |
GB (1) | GB1328665A (de) |
NL (1) | NL7018746A (de) |
ZA (1) | ZA708418B (de) |
-
1970
- 1970-11-27 CA CA099350A patent/CA928818A/en not_active Expired
- 1970-12-14 ZA ZA708418A patent/ZA708418B/xx unknown
- 1970-12-21 DE DE19702062957 patent/DE2062957A1/de active Pending
- 1970-12-22 GB GB6086870A patent/GB1328665A/en not_active Expired
- 1970-12-23 NL NL7018746A patent/NL7018746A/xx unknown
- 1970-12-23 ES ES386797A patent/ES386797A1/es not_active Expired
- 1970-12-23 FR FR707046459A patent/FR2072054B1/fr not_active Expired
- 1970-12-23 BE BE760766A patent/BE760766A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
DE2062957A1 (de) | 1971-07-08 |
ES386797A1 (es) | 1973-04-01 |
FR2072054A1 (de) | 1971-09-24 |
GB1328665A (en) | 1973-08-30 |
CA928818A (en) | 1973-06-19 |
NL7018746A (de) | 1971-06-28 |
BE760766A (fr) | 1971-05-27 |
FR2072054B1 (de) | 1973-02-02 |
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