Transmission device for multiplex transmission between a television camera and its control unit

Claim 2

A transmission device for multiplex transmission, in a given frequency band, between a television camera and its control unit, said camera being operated at a given field frequency, said device comprising: a transmission cable inserted between said camera and said control unit; and, within the control unit, first means for producing, out of a plurality of narrow band signals to be transmitted to the camera, a time-multiplex signal whose d.c. component is zero, and second means for simultaneously applying to said cable, for transmission to said camera, electrical power at zero frequency and said time-multiplex signal; said first means comprising a generator producing a basic frequency Fo, Fo being a multiple of said field frequency; means for deriving from said basic frequency an auxiliary sampling frequency Fo/q where q is an integer greater than 1; and a sampling circuit receiving said basic frequency and said auxiliary frequency Fo/q for sampling at least one of said narrow band signals at said basic frequency and for sampling at least another one of said narrow band signals at said auxiliary frequency Fo/q.

Claim 3

A transmission device for multiplex transmission, in a given frequency band, between a television camera and its control unit, said camera being operated at a given field frequency, and being a colour television camera generating three video signals, said transmission device comprising: a transmission cable inserted between said camera and said control unit; and, within the control unit, first means for producing, out of a plurality of narrow band signals to be transmitted to the camera, a time-multiplex signal whose d.c. component is zero, and second means for simultaneously applying to said cable, for transmission to said camera, electrical power at zero frequency and said time-multiplex signal; said first means comprising a generator producing a basic frequency Fo, Fo being a multiple of said field frequency, means for deriving from said basic frequency an auxiliary sampling frequency Fo/q where q is an integer greater than 1; and a sampling circuit receiving said basic frequency and said auxiliary frequency Fo/q for sampling at least one of said narrow band signals at said basic frequency and for sampling at least another one of said narrow band signals at said auxiliary frequency Fo/q; said transmission device further comprising, within the camera, means for the addition to said three video signals, during horizontal blanking intervals, of code pulse signAls representative of auxiliary signals of smaller bandwidth than said video signals, means for modulating said three video signals together with said code pulse signals respectively on three carriers and means for applying the resulting modulated carriers to said cable.

Claim 4

A transmission device for multiplex transmission, in a given frequency band, between a television camera and its control unit, said camera being operated at a given field frequency, and being a colour television camera generating three video signals, said transmission device comprising: a transmission cable inserted between said camera and said control unit; and, within the control unit, first means for producing, out of a plurality of narrow band signals to be transmitted to the camera, a time-multiplex signal whose d.c. component is zero, and second means for simultaneously applying to said cable, for transmission to said camera, electrical power at zero frequency and said time-multiplex signal; said first means comprising a generator producing a basic frequency Fo, Fo being a multiple of said field frequency, means for deriving from said basic frequency an auxiliary sampling frequency Fo/q where q is an integer greater than 1; and a sampling circuit receiving said basic frequency and said auxiliary frequency Fo/q for sampling at least one of said narrow band signals at said basic frequency and for sampling at least another one of said narrow band signals at said auxiliary frequency Fo/q; said transmission device further comprising, within the camera, means for the addition to said three video signals, during horizontal blanking intervals, of code pulse signAls representative of auxiliary signals of smaller bandwidth than said video signals, means for modulating said three video signals together with said code pulse signals respectively on three carriers and means for applying the resulting modulated carriers to said cable.

Claim 5

A transmission device for multiplex transmission, in a given frequency band, between a television camera and its control unit, said camera being operated at a given field frequency, and being a colour television camera generating three video signals, said transmission device comprising: a transmission cable inserted between said camera and said control unit; and, within the control unit, first means, for producing, out of a plurality of narrow band signals to be transmitted to the camera, a time-multiplex signal whose d.c. component is zero and second means for simultaneously applying to said cable, for transmission to said camera, electrical power at zero frequency and said time-multiplex signal; said first means comprising a generator producing a basic frequency Fo, Fo being a multiple of said field frequency, means for deriving from said basic frequency an auxiliary sampling freuqncy Fo/q where q is an integer greater than 1; and a sampling circuit receiving said basic frequency and said auxiliary frequency Fo/q for sampling at least one of said narrow band signals at said basic frequency and for sampling at least another one of said narrow band signals at said auxiliary frequency Fo/q; said time multiplex signal being formed by width-modulated pulses, respectively representative of the samples delivered by said sampling circuit, and each of said width-modulated pulses comprising first and second portions having opposite polarities and the same duration.

Claim 6

A transmission device for multiplex transmission, in a given frequency band, between a television camera and its control unit, said camera being operated at a given field frequency, and being a colour television camera generating three video signals, said transmission device comprising: a transmission cable inserted between said camera and said control unit; and, within the control unit, first means, for producing, out of a plurality of narrow band signals to be transmitted to the camera, a time-multiplex signal whose d.c. component is zero and second means for simultaneously applying to said cable, for transmission to said camera, electrical power at zero frequency and said time-multiplex signal; said first means comprising a generator producing a basic frequency Fo, Fo being a multiple of said field frequency, means for deriving from said basic frequency an auxiliary sampling freuqncy Fo/q where q is an integer greater than 1; and a sampling circuit receiving said basic frequency and said auxiliary frequency Fo/q for sampling at least one of said narrow band signals at said basic frequency and for sampling at least another one of said narrow band signals at said auxiliary frequency Fo/q; said time multiplex signal being formed by width-modulated pulses, respectively representative of the samples delivered by said sampling circuit, and each of said width-modulated pulses comprising first and second portions having opposite polarities and the same duration.

Claim 7

A transmission device as claimed in claim 1, wherein said first means further comprise means connected to said generator for producing a frueqnecy p.Fo, where p is an integer greater than 1, and wherein said sampling circuit comprises N1 inputs receiving said frequency p.Fo, N2 inputs receiving said frequency Fo and N3 inputs receiving said frequency Fo/q, where N1, N2, H3 are positive integers whose sum is equal to the number of signals of said and where p and q are positive integers greater than 1.

Claim 8

A transmission device as claimed in claim 2, further comprising in said control unit modulating means for modulating a video signal intended for said camera and wherein said three carriers, modulated by said video signals generated by the camera, occupy frequency channels located between the channel occupied by the time-multiplex signal and the channel occupied by the carrier modulated by said video signal intended for said camera.