JPS55104152A - Am stereo demodulation circuit - Google Patents
Am stereo demodulation circuitInfo
- Publication number
- JPS55104152A JPS55104152A JP1145979A JP1145979A JPS55104152A JP S55104152 A JPS55104152 A JP S55104152A JP 1145979 A JP1145979 A JP 1145979A JP 1145979 A JP1145979 A JP 1145979A JP S55104152 A JPS55104152 A JP S55104152A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- detection
- output
- level
- signal obtained
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/44—Arrangements characterised by circuits or components specially adapted for broadcast
- H04H20/46—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95
- H04H20/47—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems
- H04H20/49—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems for AM stereophonic broadcast systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
- H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
- H04H40/36—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Stereo-Broadcasting Methods (AREA)
Abstract
PURPOSE:To prevent the deterioration of degree of separation, by controlling the gain and amplitude of FM and PM detection circuit at the output level of AM detection and avoiding the level difference between the sum signal obtained at the AM detection and the difference signal obtained at the FM and PM detection. CONSTITUTION:The output of the AM detection circuit 12 is inputted to the matrix circuit 16 and also to the rectifying circuit 19, where the DC voltage according to the level of the said detection output level is produced. The output of the rectifying circuit 19 is fed back to the high frequency amplifying circuit 10 and intermediate frequency amplifying circuit 11, and if the input signal level is increased, the gain control circuit keeping the output at almost constant value is formed. Further, the output of the rectifying circuit 19 is connected to the control terminal 48 of the amplitude limit circuit 13 to control the gain and amplitude of the amplitude limit circuit 13 in proportion to the antenna input level. Thus, the difference between the sum signal obtained at the AM detection circuit 12 and the difference signal obtained at the FM detection circuit 14 can be eliminated to prevent the deterioration of degree of separation.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1145979A JPS55104152A (en) | 1979-02-05 | 1979-02-05 | Am stereo demodulation circuit |
US06/117,457 US4349696A (en) | 1979-02-05 | 1980-02-01 | AM Stereophonic demodulator circuit for amplitude/angle modulation system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1145979A JPS55104152A (en) | 1979-02-05 | 1979-02-05 | Am stereo demodulation circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55104152A true JPS55104152A (en) | 1980-08-09 |
JPS6217907B2 JPS6217907B2 (en) | 1987-04-20 |
Family
ID=11778673
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1145979A Granted JPS55104152A (en) | 1979-02-05 | 1979-02-05 | Am stereo demodulation circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55104152A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5711853U (en) * | 1980-06-20 | 1982-01-21 | ||
JPS5737947A (en) * | 1980-08-15 | 1982-03-02 | Hitachi Ltd | Am stereo receiver |
JPS5767344A (en) * | 1980-10-15 | 1982-04-23 | Sharp Corp | Am stereo receiver |
JPS5797744A (en) * | 1980-12-10 | 1982-06-17 | Matsushita Electric Ind Co Ltd | Am stereo receiver |
JPS57206144A (en) * | 1981-06-12 | 1982-12-17 | Matsushita Electric Ind Co Ltd | Am stereo broadcasting system and its signal receiver |
JPS6478044A (en) * | 1987-09-18 | 1989-03-23 | Sanyo Electric Co | Television voice multiplex demodulation circuit |
-
1979
- 1979-02-05 JP JP1145979A patent/JPS55104152A/en active Granted
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5711853U (en) * | 1980-06-20 | 1982-01-21 | ||
JPS6221090Y2 (en) * | 1980-06-20 | 1987-05-28 | ||
JPS5737947A (en) * | 1980-08-15 | 1982-03-02 | Hitachi Ltd | Am stereo receiver |
JPS6317259B2 (en) * | 1980-08-15 | 1988-04-13 | Hitachi Ltd | |
JPS5767344A (en) * | 1980-10-15 | 1982-04-23 | Sharp Corp | Am stereo receiver |
JPS5797744A (en) * | 1980-12-10 | 1982-06-17 | Matsushita Electric Ind Co Ltd | Am stereo receiver |
JPS57206144A (en) * | 1981-06-12 | 1982-12-17 | Matsushita Electric Ind Co Ltd | Am stereo broadcasting system and its signal receiver |
JPS6315778B2 (en) * | 1981-06-12 | 1988-04-06 | Matsushita Electric Ind Co Ltd | |
JPS6478044A (en) * | 1987-09-18 | 1989-03-23 | Sanyo Electric Co | Television voice multiplex demodulation circuit |
JP2735832B2 (en) * | 1987-09-18 | 1998-04-02 | 三洋電機株式会社 | Television sound multiplex demodulation circuit |
Also Published As
Publication number | Publication date |
---|---|
JPS6217907B2 (en) | 1987-04-20 |
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