GB1007432A - Improvements in or relating to the transmission of two audio channels over a singlemodulated carrier or a single pair of wires - Google Patents

Improvements in or relating to the transmission of two audio channels over a singlemodulated carrier or a single pair of wires

Info

Publication number
GB1007432A
GB1007432A GB3517760A GB3517760A GB1007432A GB 1007432 A GB1007432 A GB 1007432A GB 3517760 A GB3517760 A GB 3517760A GB 3517760 A GB3517760 A GB 3517760A GB 1007432 A GB1007432 A GB 1007432A
Authority
GB
United Kingdom
Prior art keywords
carrier
sub
signals
modulation
sum
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
Application number
GB3517760A
Inventor
Philip Martin Thompson
Anthony Raymond Varnde Roberts
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Plessey Co Ltd
Original Assignee
Plessey Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB3517760A priority Critical patent/GB1007432A/en
Publication of GB1007432A publication Critical patent/GB1007432A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/44—Arrangements characterised by circuits or components specially adapted for broadcast
    • H04H20/46—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95
    • H04H20/47—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems
    • H04H20/48—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems for FM stereophonic broadcast systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Stereo-Broadcasting Methods (AREA)

Abstract

1,007,432. Diplex radio signalling; tunnel diode frequency multipliers. PLESSEY CO. Ltd. Jan. 10, 1962 [Oct. 13, 1960], No. 35177/ 60. Headings H3T and H4L. In a system for transmitting the sum and difference of two stereophonic or like signals either by wire or as modulation on a carrier wave, the audio-frequency sum signal is combined with a sub-carrier amplitude modulated with the difference signal, the percentage modulation being kept below 50% and the amplitude of the modulation being such as to retain the relative amplitudes of the sum and difference signals. The resultant signal consists of a sub-carrier in which the positive and negative half-cycles are modulated independently, one carrying the left-hand signals and the other the right-hand in a stereophonic system. At the receiver the two signals may be recovered separately by oppositely poled diodes. The sub-carrier may be suppressed and a sub-harmonic pilot frequency transmitted whereby the sub-carrier may be reconstituted at the receiver. In one such arrangement, Fig. 7, the 19 kc./s. pilot signal is supplied via filter 11, 12 to a tunnel diode 16 biased to operate as a non-linear amplifier, the output being taken via a filter 14, 15 tuned to 38 kc./s. The application of the system to stereoscopic or two-colour television is suggested.
GB3517760A 1960-10-13 1960-10-13 Improvements in or relating to the transmission of two audio channels over a singlemodulated carrier or a single pair of wires Expired GB1007432A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3517760A GB1007432A (en) 1960-10-13 1960-10-13 Improvements in or relating to the transmission of two audio channels over a singlemodulated carrier or a single pair of wires

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3517760A GB1007432A (en) 1960-10-13 1960-10-13 Improvements in or relating to the transmission of two audio channels over a singlemodulated carrier or a single pair of wires

Publications (1)

Publication Number Publication Date
GB1007432A true GB1007432A (en) 1965-10-13

Family

ID=10374734

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3517760A Expired GB1007432A (en) 1960-10-13 1960-10-13 Improvements in or relating to the transmission of two audio channels over a singlemodulated carrier or a single pair of wires

Country Status (1)

Country Link
GB (1) GB1007432A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4543598A (en) * 1981-07-09 1985-09-24 British Broadcasting Corporation Color television systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4543598A (en) * 1981-07-09 1985-09-24 British Broadcasting Corporation Color television systems

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