Method for processing digital signals, and subscriber station for telecommunication and teledistribution
First Claim
1. A subscriber station to be connected between, on the one hand, a pair of optical fibers for transmitting a composite optical signal representative of at least a video signal, of at least a digitized audio signal and of at least a global control signal, exchanged between said station and a swiching center, and on the other hand at least two terminals of which at least one is for receiving a video signal and of which at least one is for receiving an audio signal, each terminal being controlled by a specific control signal and being for transmitting to said station specific communication establishment request signal, at least one terminal being for transmitting an audio signal to said station, said subscriber station including:
- receiving means to be coupled to one of optical fibers and for converting an incoming composite optical signal into a composite electrical signal representative of at least a video signal, of at least a digitized audio signal and of at least a global control signal,switching circuit for receiving said composite electrical signal and for separating from said composite electrical signal at least a digitized audio signal and a global control signal,an apparatus for processing digital signals and including;
second switching circuit for receiving at least digitized audio signal and global control signal and for separating one from the other,coding-decoding circuit for decoding digitized audio signals from said second switching circuit and for coding audio signals from at least one terminal for forming digitized audio signals,link management circuit on the one hand for receiving said global control signal from said second switching circuit and for transmitting at least a specific control signal from a terminal, and on the other hand for receiving said specific communication establishment request signals from terminals and for forming a global request signal, andfirst combining circuit for receiving at least a digitized audio signal from said coding-decoding circuit and representative of audio signal from a terminal and at least a global request signal from said management circuit and for forming digital signals including said digitized audio signal and said global request signal,second combining circuit, different from first combining circuit and for receiving at least a video signal from a terminal, said digitized audio signal and said global request signal from said first combining circuit and for forming an outgoing composite electrical signal, andtransmitting means to be coupled to the other optical fiber and for converting said outgoing composite electrical signal into corresponding composite optical signal.
1 Assignment
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Accused Products
Abstract
A subscriber station receives and transmits, through two optical fibers, composite signals representative of various services as television signals, videophone signals, hifi sound signals, telephone signals, etc. The station controls exchanges between a switching center and terminals, and separates some signals from composite signals to process specific signals.
100 Citations
15 Claims
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1. A subscriber station to be connected between, on the one hand, a pair of optical fibers for transmitting a composite optical signal representative of at least a video signal, of at least a digitized audio signal and of at least a global control signal, exchanged between said station and a swiching center, and on the other hand at least two terminals of which at least one is for receiving a video signal and of which at least one is for receiving an audio signal, each terminal being controlled by a specific control signal and being for transmitting to said station specific communication establishment request signal, at least one terminal being for transmitting an audio signal to said station, said subscriber station including:
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receiving means to be coupled to one of optical fibers and for converting an incoming composite optical signal into a composite electrical signal representative of at least a video signal, of at least a digitized audio signal and of at least a global control signal, switching circuit for receiving said composite electrical signal and for separating from said composite electrical signal at least a digitized audio signal and a global control signal, an apparatus for processing digital signals and including; second switching circuit for receiving at least digitized audio signal and global control signal and for separating one from the other, coding-decoding circuit for decoding digitized audio signals from said second switching circuit and for coding audio signals from at least one terminal for forming digitized audio signals, link management circuit on the one hand for receiving said global control signal from said second switching circuit and for transmitting at least a specific control signal from a terminal, and on the other hand for receiving said specific communication establishment request signals from terminals and for forming a global request signal, and first combining circuit for receiving at least a digitized audio signal from said coding-decoding circuit and representative of audio signal from a terminal and at least a global request signal from said management circuit and for forming digital signals including said digitized audio signal and said global request signal, second combining circuit, different from first combining circuit and for receiving at least a video signal from a terminal, said digitized audio signal and said global request signal from said first combining circuit and for forming an outgoing composite electrical signal, and transmitting means to be coupled to the other optical fiber and for converting said outgoing composite electrical signal into corresponding composite optical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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- 14. Method for processing control on the one hand received global control signals into specific control signals, and on the other hand received specific request signals into global request signals, including steps selected between a first conversion step for converting global control signals into intermediate control signals, a second conversion step for converting said intermediate control signals into specific control signals, a third conversion step for converting specific request signals into intermediate request signals, a fourth conversion step for converting intermediate request signals into global request signals, and a step of temporarily storing intermediate signals, said method including successively a first step which is either a step selected between said first and fourth conversion or the determination of the fact that such conversion step cannot be immediately carried out, a second step which is either a step selected between said second and third conversion or the determination of the fact that such conversion cannot be immediately carried out, and, alternatively and repetitively, said first and second steps.
Specification