GB1286835A - Frequency discriminator circuit - Google Patents
Frequency discriminator circuitInfo
- Publication number
- GB1286835A GB1286835A GB5206769A GB5206769A GB1286835A GB 1286835 A GB1286835 A GB 1286835A GB 5206769 A GB5206769 A GB 5206769A GB 5206769 A GB5206769 A GB 5206769A GB 1286835 A GB1286835 A GB 1286835A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diodes
- signal
- inductance
- tuned circuit
- oct
- 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
- H03D3/06—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)
- Power Engineering (AREA)
- Superheterodyne Receivers (AREA)
- Filters And Equalizers (AREA)
- Burglar Alarm Systems (AREA)
Abstract
1286835 Frequency discriminators MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 23 Oct 1969 [28 Oct 1968 20 Sept 1969] 52067/69 Heading H3A In a frequency discriminator comprising inductively or capacitively (Fig. 15, not shown) coupled tuned circuits and oppositely connected pairs of diodes 28a, 29; 28b, 30, a signal e 1 derived from the primary tuned circuit is applied by an arrangement, e.g. capacitor 27 or a coupling inductance (Figs. 13, 14, not shown), to the centre of the secondary tuned circuit and two signals E<SP>+</SP>, E- obtained between the two ends of the secondary tuned circuit and ground respectively are compared with the signal e 1 to form two further signals which are subtracted to obtain the output signal. A narrower selection band is obtained by having a further inductance (Fig. 9, not shown) coupled to the primary and connected between the centre of the secondary and the junction of diodes 29, 30 so that the reference signal is increased by e 1 . Alternatively the inductance may be connected to ground to produce a slightly larger bandwidth. A narrower band may also be achieved by decreasing the detection efficiency of diodes 28a, 28b by series connected resistors (Figs. 12, 14, 15, not shown). Fig. 14 (not shown) relates to a ratio detector while all the other embodiments relate to a Foster-Seeley type of discriminator.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8016068 | 1968-10-28 | ||
| JP7556069 | 1969-09-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1286835A true GB1286835A (en) | 1972-08-23 |
Family
ID=26416702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5206769A Expired GB1286835A (en) | 1968-10-28 | 1969-10-23 | Frequency discriminator circuit |
Country Status (4)
| Country | Link |
|---|---|
| CA (1) | CA936927A (en) |
| FR (1) | FR2021712A1 (en) |
| GB (1) | GB1286835A (en) |
| NL (1) | NL155690B (en) |
-
1969
- 1969-10-23 GB GB5206769A patent/GB1286835A/en not_active Expired
- 1969-10-27 NL NL6916155A patent/NL155690B/en not_active IP Right Cessation
- 1969-10-27 FR FR6936749A patent/FR2021712A1/fr not_active Withdrawn
- 1969-10-27 CA CA065914A patent/CA936927A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2021712A1 (en) | 1970-07-24 |
| CA936927A (en) | 1973-11-13 |
| DE1954045A1 (en) | 1970-05-14 |
| DE1954045B2 (en) | 1972-09-07 |
| NL155690B (en) | 1978-01-16 |
| NL6916155A (en) | 1970-05-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |