GB1055848A - Improvements in and relating to circuit arrangements for the stereophonic reproduction of signals - Google Patents
Improvements in and relating to circuit arrangements for the stereophonic reproduction of signalsInfo
- Publication number
- GB1055848A GB1055848A GB16994/65A GB1699465A GB1055848A GB 1055848 A GB1055848 A GB 1055848A GB 16994/65 A GB16994/65 A GB 16994/65A GB 1699465 A GB1699465 A GB 1699465A GB 1055848 A GB1055848 A GB 1055848A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signals
- stereophonic
- frequency
- bridge circuit
- april
- 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
- 239000002131 composite material Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D1/00—Demodulation of amplitude-modulated oscillations
- H03D1/22—Homodyne or synchrodyne circuits
- H03D1/2209—Decoders for simultaneous demodulation and decoding of signals composed of a sum-signal and a suppressed carrier, amplitude modulated by a difference signal, e.g. stereocoders
- H03D1/2218—Decoders for simultaneous demodulation and decoding of signals composed of a sum-signal and a suppressed carrier, amplitude modulated by a difference signal, e.g. stereocoders using diodes for the decoding
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stereo-Broadcasting Methods (AREA)
- Machines For Laying And Maintaining Railways (AREA)
Abstract
1,055,848. Stereophonic radio receivers. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. April 22, 1965 [April 25, 1964], No. 16994/65. Heading H4L. In a receiver for stereophonic radio signals, providing automatic switching from stereophonic to monophonic reception and an indication thereof, the pilot signal of half the subcarrier frequency is selected by a filter 16 from the output of the conventional frequency discriminator 6, 7, and supplied via transistor 17, full-wave rectifier frequency-doubler 21, 22, transistor 24 and transformer 25, 26, as a switching signal to diagonal points of a bridge circuit de-multiplexer 46. The composite signal from the frequency-discriminator is supplied via a filter 27 to the centre-tap of transformer secondary 26 and the separated A and B signals are derived via resistors 36, 36<SP>1</SP> respectively connected to the remaining diagonal points of the bridge circuit 46. Each arm of the bridge circuit consists of a diode and resistor connected in series, and to improve the reproduction of monaural signals the diodes are provided with a forward bias via adjustable resistors 54, 55. A meter 45 gives an indication of stereophonic reception. The A and B signals are amplified by similar amplifiers 41, 42, resistor 49 providing an adjustment to minimize crosstalk. The output circuits 50, 51 provide the usual de-emphasis.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL6404602A NL6404602A (en) | 1964-04-25 | 1964-04-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1055848A true GB1055848A (en) | 1967-01-18 |
Family
ID=19789929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB16994/65A Expired GB1055848A (en) | 1964-04-25 | 1965-04-22 | Improvements in and relating to circuit arrangements for the stereophonic reproduction of signals |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US3315038A (en) |
| AT (1) | AT251036B (en) |
| BE (1) | BE662988A (en) |
| CH (1) | CH434371A (en) |
| DE (1) | DE1271774C2 (en) |
| DK (1) | DK112107B (en) |
| GB (1) | GB1055848A (en) |
| NL (1) | NL6404602A (en) |
| NO (1) | NO118385B (en) |
| SE (1) | SE302984B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3355552A (en) * | 1964-06-30 | 1967-11-28 | Gen Electric | Biasing arrangement for automatic stereophonic radio receiver |
| DE2261519C3 (en) * | 1971-12-16 | 1979-12-20 | Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka (Japan) | Four-channel stereophonic demodulation system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1149396B (en) * | 1961-12-02 | 1963-05-30 | Telefunken Patent | Reception circuit for compatible radio stereophony |
-
1964
- 1964-04-25 NL NL6404602A patent/NL6404602A/xx unknown
-
1965
- 1965-04-16 US US448603A patent/US3315038A/en not_active Expired - Lifetime
- 1965-04-21 DE DE1965N0026599 patent/DE1271774C2/en not_active Expired
- 1965-04-22 CH CH562565A patent/CH434371A/en unknown
- 1965-04-22 DK DK204265AA patent/DK112107B/en unknown
- 1965-04-22 SE SE5262/65A patent/SE302984B/xx unknown
- 1965-04-22 NO NO157799A patent/NO118385B/no unknown
- 1965-04-22 AT AT368465A patent/AT251036B/en active
- 1965-04-22 GB GB16994/65A patent/GB1055848A/en not_active Expired
- 1965-04-23 BE BE662988A patent/BE662988A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DK112107B (en) | 1968-11-11 |
| DE1271774C2 (en) | 1975-03-06 |
| AT251036B (en) | 1966-12-12 |
| NL6404602A (en) | 1965-10-26 |
| SE302984B (en) | 1968-08-12 |
| DE1271774B (en) | 1975-03-06 |
| NO118385B (en) | 1969-12-22 |
| CH434371A (en) | 1967-04-30 |
| BE662988A (en) | 1965-10-25 |
| US3315038A (en) | 1967-04-18 |
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