GB1059392A - Improvements in or relating to demodulators for frequency modulated waves - Google Patents
Improvements in or relating to demodulators for frequency modulated wavesInfo
- Publication number
- GB1059392A GB1059392A GB2255764A GB2255764A GB1059392A GB 1059392 A GB1059392 A GB 1059392A GB 2255764 A GB2255764 A GB 2255764A GB 2255764 A GB2255764 A GB 2255764A GB 1059392 A GB1059392 A GB 1059392A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- signal
- filter
- output
- mixer
- 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
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/001—Details of arrangements applicable to more than one type of frequency demodulator
- H03D3/002—Modifications of demodulators to reduce interference by undesired signals
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Superheterodyne Receivers (AREA)
Abstract
1,059,392. Frequency demodulation. G. BATTAIL, and P. BROSSARD. June 1, 1964 [Jan. 21, 1964], No. 22557/64. Addition to 960,807. Heading H3A. In a modification of the demodulator for frequency-modulated signals described in the parent Specification, the output of the local oscillator 35, frequency modulated by an estimate of the modulating signal and the delayed received signal obtained via delay unit 20 are applied to a first mixer 43 which derives a difference signal which is applied via a narrow pass-band filter 45 to a second mixer 490 to which the output from local oscillator 35 is also applied via a filter 470 and the output of the second mixer is applied via a further filter 491 to a frequency discriminator 460 which supplies output terminal 102. If the local oscillator signal is chosen lower in frequency than the received signal the local oscillator signal and the difference signal are added in the second mixer to provide an output signal to discriminator 460 equal in frequency to the received signal. The filter 470 is chosen to have a delay time equal to that of filter 45.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR961085A FR85134E (en) | 1964-01-21 | 1964-01-21 | Frequency modulated wave demodulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1059392A true GB1059392A (en) | 1967-02-22 |
Family
ID=8821407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2255764A Expired GB1059392A (en) | 1964-01-21 | 1964-06-01 | Improvements in or relating to demodulators for frequency modulated waves |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR85134E (en) |
| GB (1) | GB1059392A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3516492A1 (en) * | 1985-05-08 | 1986-11-13 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | RADIO RECEIVER |
-
1964
- 1964-01-21 FR FR961085A patent/FR85134E/en not_active Expired
- 1964-06-01 GB GB2255764A patent/GB1059392A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR85134E (en) | 1965-06-18 |
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