GB1530151A - Frequency discriminators - Google Patents
Frequency discriminatorsInfo
- Publication number
- GB1530151A GB1530151A GB110475A GB110475A GB1530151A GB 1530151 A GB1530151 A GB 1530151A GB 110475 A GB110475 A GB 110475A GB 110475 A GB110475 A GB 110475A GB 1530151 A GB1530151 A GB 1530151A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- frequency
- centre frequency
- pulse
- input signal
- 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
- H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
- H03D3/18—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by means of synchronous gating arrangements
- H03D3/20—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by means of synchronous gating arrangements producing pulses whose amplitude or duration depends on phase difference
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
- H03D2200/0001—Circuit elements of demodulators
- H03D2200/0039—Exclusive OR logic circuits
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manipulation Of Pulses (AREA)
Abstract
1530151 Frequency detection GENERAL ELECTRIC CO Ltd 12 Jan 1976 [10 Jan 1975] 1104/75 Heading G4H [Also in Division H3] A frequency discriminator suitable for detecting signals selectively at one of two frequencies comprises a multi-stage shift register 1 to which is applied an input signal having positive and negative portions represented by respective trains of like binary digits, an arrangement 3 for stepping the digits along the register 1 at a higher rate, two detectors 6, 13 connected to the register 1 and spaced apart by a distance corresponding to half the period of the input centre frequency, each for detecting a transition between the two type of trains and an arrangement 19-51, e.g. a bistable-logic gate circuitry, responsive to the detector outputs for providing a pulse output which varies in pulse duration and/or pulse repetition rate in accordance with the deviation of the input signal from its centre frequency. The pulse output may be applied (Fig. 2, not shown) via a gating circuit to a low pass filter and a zero-crossing detector to obtain an analogue output. A NAND gate 20 prevents an output being produced when the input signal is at the centre frequency. An output is provided at terminal 52 or 53 in dependence upon whether the instantaneous frequency is below or above the centre frequency. In operation, the bistable circuit 27 is set and reset by the output of a corresponding one of the detectors 6, 13 so that the output of 27 has a duration and a repetition rate dependent on the amount of deviation from the centre frequency.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB110475A GB1530151A (en) | 1976-01-12 | 1976-01-12 | Frequency discriminators |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB110475A GB1530151A (en) | 1976-01-12 | 1976-01-12 | Frequency discriminators |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1530151A true GB1530151A (en) | 1978-10-25 |
Family
ID=9716226
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB110475A Expired GB1530151A (en) | 1976-01-12 | 1976-01-12 | Frequency discriminators |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1530151A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2550675A1 (en) * | 1983-07-25 | 1985-02-15 | Gen Electric | DISCRIMINATOR CIRCUIT AND METHOD OF OPERATING THE SAME |
EP1022847A2 (en) * | 1998-09-22 | 2000-07-26 | Micro Analog Systems OY | FM demodulator |
-
1976
- 1976-01-12 GB GB110475A patent/GB1530151A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2550675A1 (en) * | 1983-07-25 | 1985-02-15 | Gen Electric | DISCRIMINATOR CIRCUIT AND METHOD OF OPERATING THE SAME |
EP1022847A2 (en) * | 1998-09-22 | 2000-07-26 | Micro Analog Systems OY | FM demodulator |
EP1022847A3 (en) * | 1998-09-22 | 2002-01-02 | Micro Analog Systems OY | FM demodulator |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |