JPS6471261A - Multi-frequency signal receiver - Google Patents
Multi-frequency signal receiverInfo
- Publication number
- JPS6471261A JPS6471261A JP62227828A JP22782887A JPS6471261A JP S6471261 A JPS6471261 A JP S6471261A JP 62227828 A JP62227828 A JP 62227828A JP 22782887 A JP22782887 A JP 22782887A JP S6471261 A JPS6471261 A JP S6471261A
- Authority
- JP
- Japan
- Prior art keywords
- frequency signal
- signal
- frequency
- power
- outputted
- 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 prevent the malfunction of a multi-frequency signal receiver due to voice, by receiving it as a multi-frequency signal only when the ratio of the power of the input signal excluded of the multi-frequency signal component to the power of the input signal is smaller than a prescribed value. CONSTITUTION:When a multi-frequency signal including a voice signal is inputted (90), high/low frequency signals are filtered (21, 22), limited (31, 32) and the resulting signal is detected (41-48). The detected signal enters any of corresponding ANDs 51-58, enters ORs 501, 502 and an AND 503 outputs logic 1. The input signal being the result of rejecting (71) the multi-frequency signal component is subjected to integration for a prescribed time via an AND 72 by a power circuit 73. The input power is integrated for a prescribed time by a detection circuit 75, both the outputs are compared (76), the ratio is obtained and when it is smaller than a prescribed value, 1 is outputted, and when the consecution of the multi-frequency signal is confirmed (64), a FF 63 is set. As a result, any two DC outputs of AND circuits 51-58 are outputted to an output holding circuit 59 and the result of the multi-frequency signal is outputted from corresponding terminals 81-88. Thus, the error of the multi- frequency by the voice frequency is prevented.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62227828A JPS6471261A (en) | 1987-09-11 | 1987-09-11 | Multi-frequency signal receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62227828A JPS6471261A (en) | 1987-09-11 | 1987-09-11 | Multi-frequency signal receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6471261A true JPS6471261A (en) | 1989-03-16 |
Family
ID=16867007
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62227828A Pending JPS6471261A (en) | 1987-09-11 | 1987-09-11 | Multi-frequency signal receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6471261A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5698091A (en) * | 1980-01-08 | 1981-08-07 | Nec Corp | Multi-frequency signal receiver |
JPS61296888A (en) * | 1985-06-25 | 1986-12-27 | Nec Corp | Multiple-frequency signal receiver |
JPS62144493A (en) * | 1985-12-19 | 1987-06-27 | Nec Corp | Multifrequency signal receiver |
-
1987
- 1987-09-11 JP JP62227828A patent/JPS6471261A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5698091A (en) * | 1980-01-08 | 1981-08-07 | Nec Corp | Multi-frequency signal receiver |
JPS61296888A (en) * | 1985-06-25 | 1986-12-27 | Nec Corp | Multiple-frequency signal receiver |
JPS62144493A (en) * | 1985-12-19 | 1987-06-27 | Nec Corp | Multifrequency signal receiver |
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