GB789087A - Improvements in or relating to frequency-discriminators and phase-discriminators - Google Patents
Improvements in or relating to frequency-discriminators and phase-discriminatorsInfo
- Publication number
- GB789087A GB789087A GB7963/55A GB796355A GB789087A GB 789087 A GB789087 A GB 789087A GB 7963/55 A GB7963/55 A GB 7963/55A GB 796355 A GB796355 A GB 796355A GB 789087 A GB789087 A GB 789087A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- discriminator
- input
- resonant circuit
- phase
- 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
- 239000003990 capacitor Substances 0.000 abstract 3
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 abstract 1
- 238000010079 rubber tapping Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/02—Automatic control of frequency or phase; Synchronisation using a frequency discriminator comprising a passive frequency-determining element
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D13/00—Circuits for comparing the phase or frequency of two mutually-independent oscillations
- H03D13/007—Circuits for comparing the phase or frequency of two mutually-independent oscillations by analog multiplication of the oscillations or by performing a similar analog operation on the oscillations
- H03D13/009—Circuits for comparing the phase or frequency of two mutually-independent oscillations by analog multiplication of the oscillations or by performing a similar analog operation on the oscillations using diodes
-
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
- H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
- H03J7/045—Modification of automatic frequency control sensitivity or linearising automatic frequency control operation; Modification of the working range
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
789,087. Frequency and phase discriminators. PHILIPS ELECTRICAL INDUSTRIES, Ltd. March 18, 1955 [March 23, 1954], No. 7963/55. Class 40 (5). A frequency discriminator comprises a series resonant circuit 27, 28 from across the inductance and capacitance of which rectifiers 33, 34 are fed to give a differential output from a lowpass filter 37, 38, and the series circuit forms part of a parallel resonant circuit 27-30 resonant at approximately the same frequency so as to present across the input capacitor 30 a high impedance, e.g. to a pentode valve. Preferably the series resonance frequency lies between the half power points of the resonance frequency characteristic of the parallel resonant circuit, and may be varied between these points by varying the capacitor 28. Wider variations of the discriminator frequency may be obtained by conjointly varying, e.g. by a motor, both the capacitors 30, 28. The parallel resonant circuit as a whole may form part of a band-pass filter. The input may alternatively be connected to a tapping on the inductances 29 or 27. The discriminator may function as a phase detector if a frequency equal to that at its input is injected from a generator 41 into one or both of the output circuits through a coupling 42, 43, 431. The frequency or phase discriminator output may stabilize an input oscillation, or, through a motor, tune the discriminator to the applied frequency.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL789087X | 1954-03-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB789087A true GB789087A (en) | 1958-01-15 |
Family
ID=19832364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7963/55A Expired GB789087A (en) | 1954-03-23 | 1955-03-18 | Improvements in or relating to frequency-discriminators and phase-discriminators |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE967013C (en) |
| FR (1) | FR1128447A (en) |
| GB (1) | GB789087A (en) |
| NL (2) | NL101471C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1217464B (en) * | 1962-03-26 | 1966-05-26 | Johann Stegmueller | Circuit arrangement for the compensation of an interference voltage in the output voltage of a demodulator for frequency-modulated, electrical high-frequency oscillations caused by amplitude modulation |
-
0
- NL NLAANVRAGE7408618,A patent/NL186153B/en unknown
- NL NL101471D patent/NL101471C/xx active
-
1955
- 1955-03-18 GB GB7963/55A patent/GB789087A/en not_active Expired
- 1955-03-20 DE DEN10379A patent/DE967013C/en not_active Expired
- 1955-03-21 FR FR1128447D patent/FR1128447A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL186153B (en) | |
| DE967013C (en) | 1957-09-26 |
| FR1128447A (en) | 1957-01-04 |
| NL101471C (en) |
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