GB1528189A - Radio receiver - Google Patents
Radio receiverInfo
- Publication number
- GB1528189A GB1528189A GB51874/75A GB5187475A GB1528189A GB 1528189 A GB1528189 A GB 1528189A GB 51874/75 A GB51874/75 A GB 51874/75A GB 5187475 A GB5187475 A GB 5187475A GB 1528189 A GB1528189 A GB 1528189A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- occurs
- received
- switch
- stable
- 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
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/091—Traffic information broadcasting
- G08G1/094—Hardware aspects; Signal processing or signal properties, e.g. frequency bands
Abstract
1528189 Radio signalling INTERNATIONAL STANDARD ELECTRIC CORP 18 Dec 1975 [21 Dec 1974] 51874/75 Heading H4L In a radio receiver having a bi-stable 20 which if a marked message is received connects an a.f. transmission arrangement 4, 5 to the output of a demodulator 3 for a carrier wave, a signal SK occurs if a transmitter identifying signal, say 57 kHz, is received with a level exceeding a threshold switch 12, a signal DK occurs if an identifying signal say 125 Hz modulated on the transmitter identifying signal is received with a level exceeding a threshold switch 18, a delay circuit 13 delays the signal SK with respect to the signal DK and a setting circuit 19, which receives the signals SK and DK, resets the bi-stable if only signal SK occurs and sets it if signals SK and DK occur and leaves its state unchanged if no signal SK or DK occurs or if only signal DK occurs. In the car radio shown with switch 30 in position I a circuit 28 such as an electromagnetic relay or the emitter-collector path of a transistor or an arrangement controlling the gain of a.f. amplifier 4 maintains signal transmission to speaker 5. In switch position II the transmission path 28 is closed only if the radio is tuned to a transmitter marked with the transmitter identifying pilot signal 57 kHz. In switch position III the path 28 is closed only during the transmission of, e.g. traffic information marked with a message tone of 125 Hz. LED's 26 and 27 indicate that a transmitter identifying signal and a transmission marked with a message tone are received. If when bi-stable 20 has been set by outputs from SK and DK the received signal fades the bi-stable 20 maintains the condition of the switch 28 and when the received signal is again of sufficient strength as signal SK is delayed by the delay circuit 13 until after signal DK occurs that state of the bi-stable remains anchoraged. In a modification (Fig. 2, not shown) exclusive OR gate 21 and AND gate 22 of the setting circuit 19 are replaced by AND gates (35, 36) and an inverter (37) and if there is no control signal at 29 a changeover switch (33) connects the input of the a.f. amplifier 4 to the output of a cassette recorder tone source 34.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19742460983 DE2460983A1 (en) | 1974-12-21 | 1974-12-21 | RADIO RECEIVER |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1528189A true GB1528189A (en) | 1978-10-11 |
Family
ID=5934349
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB51874/75A Expired GB1528189A (en) | 1974-12-21 | 1975-12-18 | Radio receiver |
Country Status (10)
Country | Link |
---|---|
AT (1) | ATA939275A (en) |
BE (1) | BE836772R (en) |
CH (1) | CH600695A5 (en) |
DE (1) | DE2460983A1 (en) |
DK (1) | DK579375A (en) |
ES (1) | ES443675A1 (en) |
GB (1) | GB1528189A (en) |
NL (1) | NL7514563A (en) |
NO (1) | NO754220L (en) |
SE (1) | SE401763B (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2544508C3 (en) * | 1975-10-04 | 1983-11-03 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Circuit arrangement, in particular for a radio receiver |
DE2824006C3 (en) * | 1978-06-01 | 1981-04-09 | Audi Nsu Auto Union Ag, 7107 Neckarsulm | Search aid circuit in a radio receiver for carrier frequency tuning of carrier frequencies to which a pilot tone is applied |
US4420658A (en) * | 1981-05-04 | 1983-12-13 | Hazeltine Corporation | Multiple tone signal system |
DE3121034C2 (en) * | 1981-05-27 | 1987-01-02 | Blaupunkt-Werke Gmbh, 3200 Hildesheim | FM receiver |
DE3144289A1 (en) * | 1981-11-07 | 1983-05-19 | Blaupunkt-Werke Gmbh, 3200 Hildesheim | BROADCAST RECEIVER |
DE3211813A1 (en) * | 1982-03-31 | 1983-10-13 | Blaupunkt-Werke Gmbh, 3200 Hildesheim | CIRCUIT FOR CONTROLLING THE READINESS OF A MUTED WARNING RADIO RECEIVER |
DE3323524A1 (en) * | 1983-06-30 | 1985-01-10 | Blaupunkt-Werke Gmbh, 3200 Hildesheim | CAR RECEIVER |
-
1974
- 1974-12-21 DE DE19742460983 patent/DE2460983A1/en active Pending
-
1975
- 1975-12-11 AT AT939275A patent/ATA939275A/en not_active Application Discontinuation
- 1975-12-12 NO NO754220A patent/NO754220L/no unknown
- 1975-12-15 NL NL7514563A patent/NL7514563A/en not_active Application Discontinuation
- 1975-12-16 CH CH1626375A patent/CH600695A5/xx not_active IP Right Cessation
- 1975-12-17 SE SE7514245A patent/SE401763B/en unknown
- 1975-12-18 GB GB51874/75A patent/GB1528189A/en not_active Expired
- 1975-12-18 BE BE2054728A patent/BE836772R/en active
- 1975-12-19 DK DK579375A patent/DK579375A/en not_active Application Discontinuation
- 1975-12-19 ES ES443675A patent/ES443675A1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
ES443675A1 (en) | 1977-05-01 |
BE836772R (en) | 1976-06-18 |
ATA939275A (en) | 1980-02-15 |
DE2460983A1 (en) | 1976-07-01 |
SE401763B (en) | 1978-05-22 |
NO754220L (en) | 1976-06-22 |
NL7514563A (en) | 1976-06-23 |
SE7514245L (en) | 1976-06-22 |
DK579375A (en) | 1976-06-22 |
CH600695A5 (en) | 1978-06-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |