JPS5457945A - Digital envelope detector - Google Patents
Digital envelope detectorInfo
- Publication number
- JPS5457945A JPS5457945A JP12487277A JP12487277A JPS5457945A JP S5457945 A JPS5457945 A JP S5457945A JP 12487277 A JP12487277 A JP 12487277A JP 12487277 A JP12487277 A JP 12487277A JP S5457945 A JPS5457945 A JP S5457945A
- Authority
- JP
- Japan
- Prior art keywords
- absolute value
- sampling
- amplitude
- frequency
- digital
- 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.)
- Granted
Links
Abstract
PURPOSE: To enhance S/N by selecting a sampling frequency so that it may satisfy a prescribed condition when an amplitude-modulated waveform is coded and this absolute value is demodulated through a digital LPF.
CONSTITUTION: Receiving amplitude-modulated wave P(t) is subjected to sampling by frequency fs in sampling hold circuit 11, and is coded by A/D converter 12. Then, this absolute value is caused to pass digital LPF14, which extracts only base band components, and D/A converter 15 through digital absolute value circuit 13, thereby taking out base band signal A(t) as a demodulated output. At this time, sampling frequency fs is so selected that modulation components, whose frequency is two times as high as the carrier of the amplitude-modulated wave, may be prevented from entering in the band of LPF14, so that S/N can be enhanced
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12487277A JPS6046845B2 (en) | 1977-10-18 | 1977-10-18 | digital envelope detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12487277A JPS6046845B2 (en) | 1977-10-18 | 1977-10-18 | digital envelope detector |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5457945A true JPS5457945A (en) | 1979-05-10 |
JPS6046845B2 JPS6046845B2 (en) | 1985-10-18 |
Family
ID=14896177
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12487277A Expired JPS6046845B2 (en) | 1977-10-18 | 1977-10-18 | digital envelope detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6046845B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01151826A (en) * | 1987-08-07 | 1989-06-14 | Burr Brown Corp | Sub-range analog-digital converter with multplex input amplifier separating circuit between reduction junction point and lsb encoder |
-
1977
- 1977-10-18 JP JP12487277A patent/JPS6046845B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01151826A (en) * | 1987-08-07 | 1989-06-14 | Burr Brown Corp | Sub-range analog-digital converter with multplex input amplifier separating circuit between reduction junction point and lsb encoder |
Also Published As
Publication number | Publication date |
---|---|
JPS6046845B2 (en) | 1985-10-18 |
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