IT1172130B - Transmission for multiple signals for prepayment TV - Google Patents
Transmission for multiple signals for prepayment TVInfo
- 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
Links
- 230000005540 biological transmission Effects 0.000 title abstract 2
- 230000005236 sound signal Effects 0.000 abstract 5
- 230000001944 accentuation Effects 0.000 abstract 1
- 239000002131 composite material Substances 0.000 abstract 1
Landscapes
- 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.
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) |
-
1981
- 1981-12-07 IT IT49854/81A patent/IT1172130B/en active
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 |