IT1172130B - Transmission for multiple signals for prepayment TV - Google Patents

Transmission for multiple signals for prepayment TV

Info

Publication number
IT1172130B
IT1172130B IT49854/81A IT4985481A IT1172130B IT 1172130 B IT1172130 B IT 1172130B IT 49854/81 A IT49854/81 A IT 49854/81A IT 4985481 A IT4985481 A IT 4985481A IT 1172130 B IT1172130 B IT 1172130B
Authority
IT
Italy
Prior art keywords
signals
audio
transmission
summer
quadrature
Prior art date
Application number
IT49854/81A
Other languages
Italian (it)
Other versions
IT8149854A0 (en
Inventor
Robert W Field
Ronald R Gerlach
Clarence D Perr
Robert S Block
Original Assignee
Telease Inc
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 Telease Inc filed Critical Telease Inc
Priority to IT49854/81A priority Critical patent/IT1172130B/en
Publication of IT8149854A0 publication Critical patent/IT8149854A0/en
Application granted granted Critical
Publication of IT1172130B publication Critical patent/IT1172130B/en

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  • Radio Relay Systems (AREA)
  • Meter Arrangements (AREA)

Abstract

Normal and supplementary audio signals are filtered by passband filters which limit the audio frequency range. The filter outputs are supplied to pre-accentuation circuits and the normal audio signal passes to a summer while the other signals pass to mixer circuits. The mixer outputs are carrier suppressed double sideband signals in-phase and quadrature w.r.t. a pilot tone from a generator. The in phase and quadrature signals are combined in summers. A low pass filter, following the summer for the combination of two audio signals, attenuates the high frequency content. A second low pass filter attenuates high frequency content of the composite audio signal to produce a scrambled output containing all the audio signals for transmission to subscribers.
IT49854/81A 1981-12-07 1981-12-07 Transmission for multiple signals for prepayment TV IT1172130B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
IT49854/81A IT1172130B (en) 1981-12-07 1981-12-07 Transmission for multiple signals for prepayment TV

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT49854/81A IT1172130B (en) 1981-12-07 1981-12-07 Transmission for multiple signals for prepayment TV

Publications (2)

Publication Number Publication Date
IT8149854A0 IT8149854A0 (en) 1981-12-07
IT1172130B true IT1172130B (en) 1987-06-18

Family

ID=11271720

Family Applications (1)

Application Number Title Priority Date Filing Date
IT49854/81A IT1172130B (en) 1981-12-07 1981-12-07 Transmission for multiple signals for prepayment TV

Country Status (1)

Country Link
IT (1) IT1172130B (en)

Also Published As

Publication number Publication date
IT8149854A0 (en) 1981-12-07

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Legal Events

Date Code Title Description
TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19931229