GB1401357A - Radio-frequency receiving circuit - Google Patents
Radio-frequency receiving circuitInfo
- Publication number
- GB1401357A GB1401357A GB5648472A GB5648472A GB1401357A GB 1401357 A GB1401357 A GB 1401357A GB 5648472 A GB5648472 A GB 5648472A GB 5648472 A GB5648472 A GB 5648472A GB 1401357 A GB1401357 A GB 1401357A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- demodulator
- amplifier
- signal
- pass filter
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
- H03D3/06—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators
- H03D3/08—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators by means of diodes, e.g. Foster-Seeley discriminator
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Superheterodyne Receivers (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
1401357 Detectors and discriminators INTERNATIONAL STANDARD ELECTRIC CORP 7 Dec 1972 [10 Dec 1971] 56484/72 Headings H3Q and H3A In a radio frequency receiving circuit comprising an amplifier 9, a demodulator 9 for demodulating a signal amplified by the amplifier and a frequency selective circuit 10, 11 for selecting a reference frequency signal U ref from the amplified signal and feeding it to the demodulator 9, the frequency selective circuit comprises a first LC resonant circuit L1, C1 and a second LC resonant circuit L2, C2 both of which are tuned to the same frequency and which are over critically reactively coupled together to form a double peaked bond pass filter and two diode rectifiers 12, 13 are connected to the band pass filter 10, 11 to form a frequency discriminator. A limiter may be combined with the amplifier and demodulator 9. The output NF from the demodulator provides a signal voltage to a video amplifier and the demodulator operates as a heterodyne detector. The band pass filter 10, 11 has a reference carrier signal U ref /frequency characteristic having a double hump (Fig. 5, not shown). The receiving circuit may be used for frequency stabilization of UHF oscillators using varactor diodes.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19712161478 DE2161478B2 (en) | 1971-12-10 | 1971-12-10 | HIGH FREQUENCY RECEIVING CIRCUIT, IN PARTICULAR TELEVISION RECEIVER WITH AUTOMATIC FREQUENCY CONTROL |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1401357A true GB1401357A (en) | 1975-07-16 |
Family
ID=5827668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5648472A Expired GB1401357A (en) | 1971-12-10 | 1972-12-07 | Radio-frequency receiving circuit |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE2161478B2 (en) |
| FR (1) | FR2162611B1 (en) |
| GB (1) | GB1401357A (en) |
| ZA (1) | ZA728420B (en) |
-
1971
- 1971-12-10 DE DE19712161478 patent/DE2161478B2/en not_active Ceased
-
1972
- 1972-11-28 ZA ZA728420A patent/ZA728420B/en unknown
- 1972-12-07 GB GB5648472A patent/GB1401357A/en not_active Expired
- 1972-12-08 FR FR7243814A patent/FR2162611B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2162611B1 (en) | 1980-04-04 |
| DE2161478A1 (en) | 1973-06-14 |
| DE2161478B2 (en) | 1977-11-03 |
| ZA728420B (en) | 1973-07-25 |
| FR2162611A1 (en) | 1973-07-20 |
| AU4959172A (en) | 1974-06-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
| PCNP | Patent ceased through non-payment of renewal fee |