IT1034825B - AM-FM demodulator for superheterodyne receiver - has two frequency modulation systems and selective limiter of regenerative type - Google Patents
AM-FM demodulator for superheterodyne receiver - has two frequency modulation systems and selective limiter of regenerative typeInfo
- Publication number
- IT1034825B IT1034825B IT2197675A IT2197675A IT1034825B IT 1034825 B IT1034825 B IT 1034825B IT 2197675 A IT2197675 A IT 2197675A IT 2197675 A IT2197675 A IT 2197675A IT 1034825 B IT1034825 B IT 1034825B
- Authority
- IT
- Italy
- Prior art keywords
- amplifier
- filter
- demodulator
- output
- frequency modulation
- Prior art date
Links
Landscapes
- Circuits Of Receivers In General (AREA)
- Superheterodyne Receivers (AREA)
Abstract
The frequency modulated demodulator has two input signals which have the same nominal central frequency. It comprises an FM-filter (18) and transistor pairs (Q1, Q2) (Q8, Q8) and non-inverting different amplifiers with an output amplifying amplifier (Q10) in the emitter line. These circuits set a series of pulses of variable time. Each of the emitters of the input transistors is connected with an constant current source of about 130 muA. Output from the filter is rectified by diodes (D4D5) before amplification and transmission to the audio amplifier. The AM stage of the heterodyne system similarly includes an AM filter transistor amplifier and output amplifier. The combined system an AM-FM converter with AFC and ACC.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US45790874A | 1974-04-04 | 1974-04-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
IT1034825B true IT1034825B (en) | 1979-10-10 |
Family
ID=23818545
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT2197675A IT1034825B (en) | 1974-04-04 | 1975-04-03 | AM-FM demodulator for superheterodyne receiver - has two frequency modulation systems and selective limiter of regenerative type |
Country Status (3)
Country | Link |
---|---|
HK (3) | HK42080A (en) |
IE (1) | IE42213B1 (en) |
IT (1) | IT1034825B (en) |
-
1975
- 1975-04-03 IE IE74675A patent/IE42213B1/en unknown
- 1975-04-03 IT IT2197675A patent/IT1034825B/en active
-
1980
- 1980-08-07 HK HK42080A patent/HK42080A/en unknown
- 1980-08-07 HK HK42180A patent/HK42180A/en unknown
- 1980-08-14 HK HK43180A patent/HK43180A/en unknown
Also Published As
Publication number | Publication date |
---|---|
IE42213B1 (en) | 1980-07-02 |
HK43180A (en) | 1980-08-22 |
HK42080A (en) | 1980-08-15 |
HK42180A (en) | 1980-08-15 |
IE42213L (en) | 1975-10-04 |
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