USB349948I5 - - Google Patents
Info
- Publication number
- USB349948I5 USB349948I5 US34994873A USB349948I5 US B349948 I5 USB349948 I5 US B349948I5 US 34994873 A US34994873 A US 34994873A US B349948 I5 USB349948 I5 US B349948I5
- Authority
- US
- United States
- 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.)
- Pending
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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Amplifiers (AREA)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US349948A US3914557A (en) | 1973-04-11 | 1973-04-11 | Multifrequency tone detecting arrangement |
CA188,538A CA994484A (en) | 1973-04-11 | 1973-12-19 | Multifrequency tone detecting arrangement |
CA239,889A CA994435A (en) | 1973-04-11 | 1975-11-18 | Multifrequency tone detecting arrangement |
CA239,887A CA994433A (en) | 1973-04-11 | 1975-11-18 | Multifrequency tone detecting arrangement |
CA239,888A CA994434A (en) | 1973-04-11 | 1975-11-18 | Multifrequency tone detecting arrangement |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US349948A US3914557A (en) | 1973-04-11 | 1973-04-11 | Multifrequency tone detecting arrangement |
Publications (2)
Publication Number | Publication Date |
---|---|
USB349948I5 true USB349948I5 (en) | 1975-01-28 |
US3914557A US3914557A (en) | 1975-10-21 |
Family
ID=23374653
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US349948A Expired - Lifetime US3914557A (en) | 1973-04-11 | 1973-04-11 | Multifrequency tone detecting arrangement |
Country Status (2)
Country | Link |
---|---|
US (1) | US3914557A (en) |
CA (1) | CA994484A (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5543677B2 (en) * | 1974-05-15 | 1980-11-07 | ||
JPS5234607A (en) * | 1975-08-01 | 1977-03-16 | Nec Corp | Multifrequency signal receiving system |
CA1031086A (en) * | 1976-03-03 | 1978-05-09 | Northern Electric Company | Method and apparatus for translating multiple frequency signalling |
US4028501A (en) * | 1976-03-04 | 1977-06-07 | Northern Electric Company Limited | Method and apparatus for translating multiple frequency signalling |
FR2373926A1 (en) * | 1976-12-10 | 1978-07-07 | Constr Telephoniques | MULTI-FREQUENCY SIGNAL RECEIVER |
US4091243A (en) * | 1977-07-26 | 1978-05-23 | Bell Telephone Laboratories, Incorporated | Multifrequency signal receiver |
US6385253B1 (en) * | 1999-12-10 | 2002-05-07 | Next Level Communications | Method and apparatus for reliable reception of VDSL signals |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3140357A (en) * | 1962-06-28 | 1964-07-07 | Bell Telephone Labor Inc | Multifrequency receiver |
US3582565A (en) * | 1969-01-13 | 1971-06-01 | Automatic Elect Lab | Tone channels for multifrequency receivers |
US3780230A (en) * | 1972-11-10 | 1973-12-18 | Bell Telephone Labor Inc | Multifrequency tone receiver |
US3795775A (en) * | 1972-10-16 | 1974-03-05 | Microsystems Int Ltd | Dual tone receiver |
-
1973
- 1973-04-11 US US349948A patent/US3914557A/en not_active Expired - Lifetime
- 1973-12-19 CA CA188,538A patent/CA994484A/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3140357A (en) * | 1962-06-28 | 1964-07-07 | Bell Telephone Labor Inc | Multifrequency receiver |
US3582565A (en) * | 1969-01-13 | 1971-06-01 | Automatic Elect Lab | Tone channels for multifrequency receivers |
US3795775A (en) * | 1972-10-16 | 1974-03-05 | Microsystems Int Ltd | Dual tone receiver |
US3780230A (en) * | 1972-11-10 | 1973-12-18 | Bell Telephone Labor Inc | Multifrequency tone receiver |
Also Published As
Publication number | Publication date |
---|---|
US3914557A (en) | 1975-10-21 |
CA994484A (en) | 1976-08-03 |