PL202703A1 - ELECTRICAL SIGNAL FILTERING DEVICE FOR SEVERAL FREQUENCY DETECTION - Google Patents
ELECTRICAL SIGNAL FILTERING DEVICE FOR SEVERAL FREQUENCY DETECTIONInfo
- Publication number
- PL202703A1 PL202703A1 PL20270377A PL20270377A PL202703A1 PL 202703 A1 PL202703 A1 PL 202703A1 PL 20270377 A PL20270377 A PL 20270377A PL 20270377 A PL20270377 A PL 20270377A PL 202703 A1 PL202703 A1 PL 202703A1
- Authority
- PL
- Poland
- Prior art keywords
- electrical signal
- filtering device
- frequency detection
- signal filtering
- several frequency
- Prior art date
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)
- Networks Using Active Elements (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7637276A FR2373934A1 (en) | 1976-12-10 | 1976-12-10 | Telephone system tuned filter circuit - has several tuned sections each preceded by operational amplifier receiving output of adjacent section |
Publications (1)
Publication Number | Publication Date |
---|---|
PL202703A1 true PL202703A1 (en) | 1978-08-28 |
Family
ID=9180912
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PL20270377A PL202703A1 (en) | 1976-12-10 | 1977-12-07 | ELECTRICAL SIGNAL FILTERING DEVICE FOR SEVERAL FREQUENCY DETECTION |
Country Status (9)
Country | Link |
---|---|
BE (1) | BE861001A (en) |
BR (1) | BR7708213A (en) |
DE (1) | DE2754026A1 (en) |
FR (1) | FR2373934A1 (en) |
IT (1) | IT1088733B (en) |
LU (1) | LU78661A1 (en) |
NL (1) | NL7713443A (en) |
PL (1) | PL202703A1 (en) |
SE (1) | SE7714018L (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3831047A1 (en) * | 1988-09-12 | 1990-03-22 | Nixdorf Computer Ag | CIRCUIT ARRANGEMENT FOR FREQUENCY SELECTIVE DETECTION OF SOUND SIGNALS |
-
1976
- 1976-12-10 FR FR7637276A patent/FR2373934A1/en not_active Withdrawn
-
1977
- 1977-11-21 BE BE1008528A patent/BE861001A/en unknown
- 1977-12-02 IT IT30300/77A patent/IT1088733B/en active
- 1977-12-05 DE DE19772754026 patent/DE2754026A1/en active Pending
- 1977-12-05 NL NL7713443A patent/NL7713443A/en not_active Application Discontinuation
- 1977-12-07 PL PL20270377A patent/PL202703A1/en unknown
- 1977-12-09 BR BR7708213A patent/BR7708213A/en unknown
- 1977-12-09 SE SE7714018A patent/SE7714018L/en unknown
- 1977-12-09 LU LU78661A patent/LU78661A1/xx unknown
Also Published As
Publication number | Publication date |
---|---|
DE2754026A1 (en) | 1978-06-15 |
BE861001A (en) | 1978-05-22 |
LU78661A1 (en) | 1978-07-12 |
SE7714018L (en) | 1978-06-11 |
BR7708213A (en) | 1978-09-05 |
IT1088733B (en) | 1985-06-10 |
FR2373934A1 (en) | 1978-07-07 |
NL7713443A (en) | 1978-06-13 |
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