US3701852A — Transmission system and associated transmitters a…

Claim 1

Independent Claim 351 words

A transmission system for the transmission of binary pulse signals in a prescribed transmission band within which the pulses coincide with the pulses of a clock signal having a given clock frequency, said pulse signals being modulated on a carrier signal in a modulator at the transmitter end and at the receiver end being demodulated in a demodulator the output signal of which is applied to a pulse regenerator, while pilot signals are cotransmitted with the pulse signals modulated on the carrier signal, which pilot signals are selected at the receiver end in a pilot circuit so as to generate a local carrier and clock signal, characterized in that the modulator is constituted by a dual single sideband modulator, comprising two parallel-arranged channels binary pulse signals being applied to said channels, each channel including a coder for converting the applied binary pulse signals into multilevel pulse signals, while a lowpass filter and a single sideband modulator are connected in cascade to the outputs of each coder, said single sideband modulators being controlled by mutually different carrier signals having frequencies located on either side of the center of the transmission band, the outputs of said single sideband modulators being applied to a combination device to produce a dual single sideband signal constituted by the two single sideband signals at the outputs of the single sideband modulators and having a frequency space left around the center of the transmission band for the transmission of two pilot signals, the ratio of the clock frequency and the frequency difference of the two pilot signals being given by an integer, the demodulator in the receiver being constituted by a dual single sideband demodulator comprising two single sideband demodulators the received dual single sideband signal being applied to each of said demodulators, each single sideband demodulator being controlled by a local carrier signal, said carrier signals having mutually different frequencies the output of each single sideband demodulator being connected to a decoder controlled by a local clock signal which together with the two local carrier signals is derived in the pilot circuit from the received pilot signals.

Claim 2

Dependent Claim 351 words

A transmission system for the transmission of binary pulse signals in a prescribed transmission band within which the pulses coincide with the pulses of a clock signal having a given clock frequency, said pulse signals being modulated on a carrier signal in a modulator at the transmitter end and at the receiver end being demodulated in a demodulator the output signal of which is applied to a pulse regenerator, while pilot signals are cotransmitted with the pulse signals modulated on the carrier signal, which pilot signals are selected at the receiver end in a pilot circuit so as to generate a local carrier and clock signal, characterized in that the modulator is constituted by a dual single sideband modulator, comprising two parallel-arranged channels binary pulse signals being applied to said channels, each channel including a coder for converting the applied binary pulse signals into multilevel pulse signals, while a lowpass filter and a single sideband modulator are connected in cascade to the outputs of each coder, said single sideband modulators being controlled by mutually different carrier signals having frequencies located on either side of the center of the transmission band, the outputs of said single sideband modulators being applied to a combination device to produce a dual single sideband signal constituted by the two single sideband signals at the outputs of the single sideband modulators and having a frequency space left around the center of the transmission band for the transmission of two pilot signals, the ratio of the clock frequency and the frequency difference of the two pilot signals being given by an integer, the demodulator in the receiver being constituted by a dual single sideband demodulator comprising two single sideband demodulators the received dual single sideband signal being applied to each of said demodulators, each single sideband demodulator being controlled by a local carrier signal, said carrier signals having mutually different frequencies the output of each single sideband demodulator being connected to a decoder controlled by a local clock signal which together with the two local carrier signals is derived in the pilot circuit from the received pilot signals.

Claim 3

Dependent Claim 227 words

A transmitter suitable for use in a transmission system as claimed in claim 1, for the transmission of binary pulse signals in a prescribed transmission band within which the pulses coincide with the pulses of a clock signal having a given clock frequency, said pulse signals being modulated in a modulator on a carrier, whilst pilot signals are co-transmitted with the pulse signals modulated on the carrier signal, characterized in that the modulator is constituted by a dual single sideband modulator comprising two parallel-arranged channels binary pulse signals being applied to said channels, each channel including a coder for converting the applied binary pulse signals into multi-level pulse signals, while a lowpass filter and a single sideband modulator are connected in cascade to the output of each coder, said single sideband modulators being controlled by mutually different carrier signals having frequencies located on either side of the center of the transmission band, the outputs of said single sideband modulators being applied to a combination device to produce a dual single sideband signal constituted by the two single sideband signals at the outputs of the singLe sideband modulators and having a frequency space left around the center of the transmission band for the transmission of two pilot signals, the ratio of the clock frequency and the frequency difference of the two pilot signals being given by an integer.

Claim 4

Dependent Claim 24 words

A transmitter as claimed in claim 2, characterized in that the carrier signals are applied to the dual single sideband signal as pilot signals.

Claim 5

Dependent Claim 63 words

A transmitter as claimed in claim 2, wherein the carrier signals are derived from the clock signal and a fixed oscillator whose frequency is equal to that of one of the carrier signals, while the second carrier signal is derived through an output filter from a mixer stage to which the output signal from the fixed oscillator and the frequency-divided clock-signal are applied.

Claim 6

Dependent Claim 49 words

A transmitter as claimed in claim 2, wherein the coder is constituted by a pseudo-ternary code converter having a transmission characteristic in which spectral zeros occur at frequencies given by half the clock frequency of the pulse signals applied to the pseudo-ternary code converter and multiplied by an integer.

Claim 7

Dependent Claim 110 words

A transmitter as claimed in claim 2, wherein the coder includes a pulse group analyzer having m parallel arranged output lines and which analyses consecutive pulse groups of the binary pulse signal, each output line including a pseudo-ternary code converter having a transmission characteristic in which spectral zeros occur at frequencies given by half the clock frequency of the pulse signals applied to the coder and multiplied by an integer, m- 1 output lines including an amplitude control device in cascade with the pseudo-ternary code converter, said output lines being applied to a linear combination device to produce a multi-level pulse signal within which the pulses assume 2m+ 1 levels.

Claim 8

Dependent Claim 28 words

A transmitter as claimed in claim 2, wherein the binary pulse signals applied to the parallel-arranged channels are derived from a signal pulse source through a series-parallel converter.

Claim 9

Dependent Claim 69 words

A transmitter as claimed in claim 7 for the transmission of pulses in the base group of a carrier telephony system, wherein frequency cut-off filters are connected to the output circuits of single sideband modulators in the two channels of the dual signal sideband modulator, said cut-off filters being tuned to the frequencies of the internationally standardized pilot signals transmitted in the base group of the carrier telephony system.

Claim 10

Dependent Claim 153 words

A receiver suitable for use in a transmission system as claimed in claim 1, said receiver comprising a demodulator for demodulating a received pulse signals, a pulse regenerator, means to couple the output signal of the demodulator to the pulse regenerator, and a pilot circuit in which the received pilot signals are selected so as to generate a local carrier and clock signal, said demodulator comprising by a dual single sideband demodulator comprising two single sideband demodulators the received dual single sideband signal being applied to each of said single sideband demodulators, each single sideband demodulator being controlled by a local carrier signal, said carrier signals having mutually different frequencies, a decoder controlled by a local clock signal which together with the two local carrier signals is derived in the pilot circuit from the received pilot signals and means to couple the output of each of the single sideband demodulators to the decoder.

Claim 11

Dependent Claim 80 words

A receiver as claimed in claim 9, wherein the pilot circuit includes two selection filters, the received dual single sideband signal being applied to each of said filters for selecting said pilot signals to demodulate from which the two pilot said receiver dual single sideband signal said selected pilot signals being applied to a mixer stage for recovering the clock signal said mixer stage having an output line including a cascade arrangement of a selection filter and a frequency multiplier.

Claim 12

Dependent Claim 29 words

A receiver as claimed in claim 9, wherein the decoder is coNstituted by a two-phase rectifier whose output line incorporates a pulse regenerator controlled by the local clock signal.

Claim 13

Dependent Claim 105 words

A receiver as claimed in claim 9, wherein the decoder is constituted by a series arrangement of a two-phase rectifier and a level separator controlled by the local clock signal, said cascade arrangement being provided with m parallel arranged output lines from which binary pulse series are derived which are applied to a pulse group shaper controlled by the local clock signal, said pulse group shaper converting the pulse signals applied through the parallel arranged output lines of the series arrangement to the pulse group shaper into consecutive pulse groups so as to generate the original pulse series applied to the coder in the transmitter.

Claim 14

Dependent Claim 30 words

A receiver as claimed in claim 9, wherein the output lines of the decoders are connected to a parallel-series converter from whose output the original binary pulse signals are derived.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1975-10-31	1976-05-01	1976-10-31	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1979-10-31	1980-05-01	1980-10-31	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1983-10-31	1984-05-01	1984-10-31	$7700.00	Window Closed / Lapsed

Transmission system and associated transmitters and receivers for the transmission of synchronous pulse signals

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