US3654564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Receiver including an n-phase demodulator
Assignee: US Philips Corp
•
Filing: 1970-06-04
•
Granted: 1972-04-04
•
Expires: 1990-06-04
Abstract
Abstract The invention relates to a receiver for the reception of information pulse signals transmitted by means of n-phase modulation wherein the original information pulses coincide with different pulses from a series of equidistant clock pulses, the receiver including an n-phase demodulator which is provided with a plurality of parallel arranged synchronous demodulators which are fed by carriers having mutually different reference phases originating from a local carrier generator which is stabilised in phase on the carrier associated with the received signals, signal channels being connected to the outputs of the n-phase demodulator including sampling circuits controlled by a local clock pulse generator the output signal of which sampling circuits characterizes the phase of the received carrier relative to the relevant reference phase of the local carrier at the instants of the local clock pulses, the receiver furthermore being provided with combination circuits connected to the sampling circuits, which combination circuits characterize each of the n-possible phase sectors of the transmitted signals in a phase diagram by means of a separate combination of the outputs of the signal channels. Such receivers are advantageously used in transmission systems which transmit an optimum quantity of information in the available frequency band. To stabilise the local carrier generator on the carrier at the transmitter end, the carrier frequency is transmitted, for example, in conventional manner from the transmitter to the receiver through a separate transmission path or with the aid of a pilot signal added to the information pulse signals to be transmitted.
Inventors
- 👤 Feliz Daniel Tisi
- 👤 Frank De Jager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:36
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/22; H04L27/227; H04L27/2271; H04L27/2273; H04L27/0014; H04L2027/0018; H04L2027/0022; H04L2027/0024; H04L2027/0026; H04L2027/0028; H04L2027/0044; H04L2027/0046; H04L2027/0048; H04L2027/0083; H04L2027/0087
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
445 words
A receiver for the reception of a signal comprising a received carrier signal having information pulse signals n-phase modulated thereon, said information pulses coinciding with different pulses of a series from a pulse generator having a fixed pulse repetition rate, said receiver comprising a local carrier signal generator comprising a phase stabilization circuit, means to produce first and second groups of carrier signals from said local carrier signal generator, said carrier signals in said first group having mutually different reference phases, said carrier signals in said second group having mutually different reference phases, a 2n-phase demodulator comprising an n-phase demodulator having a plurality of output means and comprising a plurality of parallel arranged synchronous demodulators which are fed by said first group of carrier signals, a local clock pulse generator for producing clock pulses, a first group of signal channels connected to the output means of said first n-phase demodulator, said first group of signal channels comprising a first group of sampling circuits having a first group of output signals, said first group of output signals having a first group of relative phases corresponding to the relative phases of said received carrier signal with respect to said first group of carrier signals at instants of the local clock pulses, a first group of combination circuits connected to said first group of sampling circuits, said combination circuits combining the output signals from said first group of signal channels to produce signals corresponding to the n-possible phase sectors of the received carrier signal, means to couple said second group of carrier signals to said 2n-phase demodulator, a second group of signal channels connected to the output means of said 2n-phase demodulatoR, said second group of signal channels comprising a second group of sampling circuits controlled by said local clock pulse generator, said second group of sampling circuits having a second group of output signals, said second group of output signals having a second group of relative phases corresponding to the relative phases of said received carrier signal with respect to said second group of carrier signals at instants of the local clock pulses, said second group of relative phases lying within the phase sectors corresponding to said first group of relative phases, a plurality of selection gates, each selection gate having an input from one of said first group of combination circuits and one of said second group of sampling circuits and having an output signal within one of the phase sectors, a combination circuit connected to the output means of each of said selection gates, and means to connect the output signal of said combination circuit to the phase stabilization circuit of said local carrier generator.
Claim 2
Dependent Claim
445 words
A receiver for the reception of a signal comprising a received carrier signal having information pulse signals n-phase modulated thereon, said information pulses coinciding with different pulses of a series from a pulse generator having a fixed pulse repetition rate, said receiver comprising a local carrier signal generator comprising a phase stabilization circuit, means to produce first and second groups of carrier signals from said local carrier signal generator, said carrier signals in said first group having mutually different reference phases, said carrier signals in said second group having mutually different reference phases, a 2n-phase demodulator comprising an n-phase demodulator having a plurality of output means and comprising a plurality of parallel arranged synchronous demodulators which are fed by said first group of carrier signals, a local clock pulse generator for producing clock pulses, a first group of signal channels connected to the output means of said first n-phase demodulator, said first group of signal channels comprising a first group of sampling circuits having a first group of output signals, said first group of output signals having a first group of relative phases corresponding to the relative phases of said received carrier signal with respect to said first group of carrier signals at instants of the local clock pulses, a first group of combination circuits connected to said first group of sampling circuits, said combination circuits combining the output signals from said first group of signal channels to produce signals corresponding to the n-possible phase sectors of the received carrier signal, means to couple said second group of carrier signals to said 2n-phase demodulator, a second group of signal channels connected to the output means of said 2n-phase demodulatoR, said second group of signal channels comprising a second group of sampling circuits controlled by said local clock pulse generator, said second group of sampling circuits having a second group of output signals, said second group of output signals having a second group of relative phases corresponding to the relative phases of said received carrier signal with respect to said second group of carrier signals at instants of the local clock pulses, said second group of relative phases lying within the phase sectors corresponding to said first group of relative phases, a plurality of selection gates, each selection gate having an input from one of said first group of combination circuits and one of said second group of sampling circuits and having an output signal within one of the phase sectors, a combination circuit connected to the output means of each of said selection gates, and means to connect the output signal of said combination circuit to the phase stabilization circuit of said local carrier generator.
Claim 3
Dependent Claim
127 words
A receiver as claimed in claim 1, further comprising means to derive a multi-level information signal from said 2n-phase demodulator, a selective circuit tuned to half the frequency of the local clock pulse generator, means to couple said selective circuit to said means to derive a multi-level information signal, a frequency doubler comprising a non-linear circuit, means to couple said frequency doubler to said selective circuit, a phase synchronizing circuit in said local pulse generator, means to couple said non-linear circuit to said phase synchronizing circuit comprising a normally open switch, and a control circuit comprising a threshold device coupled to said selective circuit, said control circuit supplying a control signal for closing said electronic switch when the signal from said selective circuit exceeds a predetermined level.
Claim 4
Dependent Claim
23 words
A receiver as claimed in claim 1, wherein said local carrier generator further comprises a frequency correction circuit coupled to said combination circuit.
Claim 5
Dependent Claim
133 words
A receiver as claimed in claim 3, wherein said local carrier generator comprises an oscillator having a frequency determining member and having two series of output pulses which are 180* out of phase, two electronic switches coupled respectively to the output means of said oscillator corresponding to the series of output pulses, two bistable triggers coupled respectively to said electronic switches, said bistable switches controlling said electronic switches, means to couple pulses from said combination circuit to set said bistable triggers, means to couple pulses from said oscillator to reset said bistable triggers, a divider coupled to said electronic switches, an integrating network in said frequency correction circuit, means to couple said combination circuit to said integrating network, and means to couple the output means from said integrating to said frequency determining member.
Claim 6
Dependent Claim
73 words
A receiver as claimed in claim 1, wherein each of the combination circuits of said first group comprises a selection gate which is coupled to a separate selection gate and means for coupling an output of one of the second group of signal channels to said separate selection gate, said coupled output of the second group of signal channels being in the phase sector corresponding to the combination circuit of said first group.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |