JPS6453658A - Direct converting fsk receiver - Google Patents
Direct converting fsk receiverInfo
- Publication number
- JPS6453658A JPS6453658A JP17448387A JP17448387A JPS6453658A JP S6453658 A JPS6453658 A JP S6453658A JP 17448387 A JP17448387 A JP 17448387A JP 17448387 A JP17448387 A JP 17448387A JP S6453658 A JPS6453658 A JP S6453658A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- frf
- becomes
- signal
- component
- 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 make sufficient a frequency converter, a base band amplifier, etc., with one system by dislocating the frequency of a local signal in upper and lower directions and extracting an upper side or lower side receiving frequency only with a filter. CONSTITUTION:The oscillation frequency of a local oscillator 20 is set higher than a central frequency (fRF) of a receiving signal by 1.875kHz. Presently, when the signal of the central frequency fRF is received and a receiving signal frequency becomes fRF+ f, the output frequency of a mixer 21 becomes 4.375kHz, as this result, the frequency component passes through a BPF22 and is detected by a detector 23. On the other hand, when the frequency of the receiving signal is fRF- f, the output frequency of the mixer 21 becomes 0.625kHz, and the frequency component does not pass through a filter 22. Consequently, the component supplied to the detector 23 becomes only the frequency component of fRF+ f and for the frequency converter, a base band amplifier, etc., one system is sufficient.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17448387A JPS6453658A (en) | 1987-07-13 | 1987-07-13 | Direct converting fsk receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17448387A JPS6453658A (en) | 1987-07-13 | 1987-07-13 | Direct converting fsk receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6453658A true JPS6453658A (en) | 1989-03-01 |
Family
ID=15979272
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17448387A Pending JPS6453658A (en) | 1987-07-13 | 1987-07-13 | Direct converting fsk receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6453658A (en) |
-
1987
- 1987-07-13 JP JP17448387A patent/JPS6453658A/en active Pending
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