GB1174503A - Receiver for F.M. Signals. - Google Patents
Receiver for F.M. Signals.Info
- Publication number
- GB1174503A GB1174503A GB1977667A GB1977667A GB1174503A GB 1174503 A GB1174503 A GB 1174503A GB 1977667 A GB1977667 A GB 1977667A GB 1977667 A GB1977667 A GB 1977667A GB 1174503 A GB1174503 A GB 1174503A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capacitor
- april
- transistors
- interference
- leading edge
- 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
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
-
- 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
-
- 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
- H03D3/04—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by counting or integrating cycles of oscillations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
- H04B1/28—Circuits for superheterodyne receivers the receiver comprising at least one semiconductor device having three or more electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Superheterodyne Receivers (AREA)
- Noise Elimination (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
1,174,503. Frequency modulation receivers. INTERNATIONAL STANDARD ELECTRIC CORP. 28 April, 1967 [30 April, 1966], No. 19776/67. Addition to 1,163,330. Headings H3A and H3R. In a F.M. receiver as described in Specification 1,163,330, the frequency discriminator responds to both the leading edge and the trailing edge of the rectangular wave I.F. signal, thereby reducing phase errors caused by interference and the limiting process. In Fig. 2, the I.F. source 1 produces push-pull outputs at 2 and 3; a positive excursion at 3 charges capacitor 5 through diode 7 and a negative excursion discharges the capacitor through transistor 9. In this way pulses of charge are applied to the output capacitor 11 at each leading edge and trailing edge of the input through the transistors 8 and 9 alternatively. The ratio of the magnitudes of the outputs at 2 and 3 may be adjustable to minimize the effect of interference. In a modified circuit, Fig. 3 (not shown), one of the transistors is omitted and the capacitors 4 an 5 are connected to the output transistor through diodes (12 and 13).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1965ST024827 DE1263113B (en) | 1965-12-31 | 1965-12-31 | Receiver for frequency-modulated signals |
| DE1966ST025313 DE1278559B (en) | 1966-04-30 | 1966-04-30 | Receiver for frequency-modulated signals |
| DE1966ST025316 DE1278561B (en) | 1965-12-31 | 1966-04-30 | Receiver for frequency-modulated signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1174503A true GB1174503A (en) | 1969-12-17 |
Family
ID=27212514
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5835766A Expired GB1163330A (en) | 1965-12-31 | 1966-12-30 | Receiver for Frequency-Modulated Signals |
| GB1977667A Expired GB1174503A (en) | 1965-12-31 | 1967-04-28 | Receiver for F.M. Signals. |
| GB1977967A Expired GB1168904A (en) | 1965-12-31 | 1967-04-28 | Receiver for F.M. Signals |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5835766A Expired GB1163330A (en) | 1965-12-31 | 1966-12-30 | Receiver for Frequency-Modulated Signals |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1977967A Expired GB1168904A (en) | 1965-12-31 | 1967-04-28 | Receiver for F.M. Signals |
Country Status (5)
| Country | Link |
|---|---|
| DE (2) | DE1263113B (en) |
| FR (1) | FR1513456A (en) |
| GB (3) | GB1163330A (en) |
| NL (1) | NL154078B (en) |
| NO (1) | NO125422B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4395735A (en) * | 1981-08-31 | 1983-07-26 | Rca Corporation | FM Counter detector |
| EP0255553B1 (en) * | 1986-08-07 | 1992-07-22 | Deutsche ITT Industries GmbH | Method for receiving frequency-modulated stereo-multiplex signals |
-
1965
- 1965-12-31 DE DE1965ST024827 patent/DE1263113B/en not_active Withdrawn
-
1966
- 1966-04-30 DE DE1966ST025316 patent/DE1278561B/en not_active Withdrawn
- 1966-12-21 NO NO16608166A patent/NO125422B/no unknown
- 1966-12-29 FR FR89264A patent/FR1513456A/en not_active Expired
- 1966-12-30 NL NL6618397A patent/NL154078B/en unknown
- 1966-12-30 GB GB5835766A patent/GB1163330A/en not_active Expired
-
1967
- 1967-04-28 GB GB1977667A patent/GB1174503A/en not_active Expired
- 1967-04-28 GB GB1977967A patent/GB1168904A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1513456A (en) | 1968-02-16 |
| GB1163330A (en) | 1969-09-04 |
| NL154078B (en) | 1977-07-15 |
| NL6618397A (en) | 1967-07-03 |
| GB1168904A (en) | 1969-10-29 |
| NO125422B (en) | 1972-09-04 |
| DE1263113B (en) | 1968-03-14 |
| DE1278561B (en) | 1968-09-26 |
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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 |