JPS6474890A - Multi-frequency signal detector - Google Patents
Multi-frequency signal detectorInfo
- Publication number
- JPS6474890A JPS6474890A JP62233061A JP23306187A JPS6474890A JP S6474890 A JPS6474890 A JP S6474890A JP 62233061 A JP62233061 A JP 62233061A JP 23306187 A JP23306187 A JP 23306187A JP S6474890 A JPS6474890 A JP S6474890A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- detected
- plural
- threshold signal
- threshold
- Prior art date
- 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
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
PURPOSE:To compare a threshold signal and a detected signal, to detect the presence and absence of the combination of a composite frequency by the compared result and to receive only a regular signal, by selectively detecting plural frequency components with a filter bank and outputting the threshold signal to be proportional to the total power of an input signal from a threshold signal generator. CONSTITUTION:A multiplexing signal is detected to combine plural m(n>m) frequencies out of plural (n) numbers of frequencies which are prepared in advance, and to be outputted by a multi-frequency detecting device. By BPFs11-1n, which are prepared in advance, of a filter bank 1 of this system, the respective frequency components are selectively outputted. By a threshold signal generating part 2, the threshold signal for signal detection to be proportional to the total power of the input signal is outputted. The threshold signal of this generating part 2 and the output signal detected by the bank 1 are compared by a comparator part 3 and according to the compared result of the comparator part 3, the presence and absence of the combination of the plural numbers (m) is detected by a detecting part 4. Then, only the regular signal is received.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62233061A JPS6474890A (en) | 1987-09-17 | 1987-09-17 | Multi-frequency signal detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62233061A JPS6474890A (en) | 1987-09-17 | 1987-09-17 | Multi-frequency signal detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6474890A true JPS6474890A (en) | 1989-03-20 |
Family
ID=16949186
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62233061A Pending JPS6474890A (en) | 1987-09-17 | 1987-09-17 | Multi-frequency signal detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6474890A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04318744A (en) * | 1991-04-18 | 1992-11-10 | Sharp Corp | Multi-frequency receiver |
-
1987
- 1987-09-17 JP JP62233061A patent/JPS6474890A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04318744A (en) * | 1991-04-18 | 1992-11-10 | Sharp Corp | Multi-frequency receiver |
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