16results about "Modulation with suppressed carrier" patented technology

The invention relates to a method and a device for converting an analog input signal into a digital output signal, comprising the following steps: feeding the analog input signal to be converted to an input side of an amplitude modulator with carrier suppression in order to obtain a carrier-free amplitude-modulated signal, a phase-modulated signal is obtained by adding a carrier signal offset by 90 DEG, preferably sinusoidal, to an amplitude-modulated signal output by an amplitude modulator by means of an adder, and the phase-modulated signal is fed to a limiter for suppressing interference amplitude modulation in the phase-modulated signal, the signal output by the limiter is fed to a demodulator and the signal output by the limiter is sampled in the demodulator with at least one sampling clock signal, wherein the phase of the at least one sampling clock signal is dynamically changed to achieve an improved resolution.

This invention discloses an amplitude-phase adjustable carrier generation device and method, belonging to the field of precision measurement and signal synthesis. The phase accumulator of this invention incorporates a phase adjuster. The phase adjuster counts the system clock, and when a set count value C is reached, it outputs a phase adjustment value S. At this time, the value of the phase register is simultaneously added to the frequency control word FCW and the phase adjustment value S. Subsequently, the phase register overflows, is cleared to zero, and accumulation restarts. The phase adjuster supplements the decimal part discarded during the rounding of the frequency control word FCW, which helps improve the frequency stability of the carrier. The CORDIC calculator of this invention employs a parallel interpolation structure, which can use n CORDIC cores to calculate the sine values ​​of n consecutive phases in parallel. The interval between two adjacent phases is the frequency control word FCW. The interpolation unit arranges the n data streams and outputs them serially. The parallel interpolation structure improves the speed and accuracy of CORDIC calculation through parallel computation, which can greatly reduce phase truncation errors and help reduce carrier spurious emissions.

The invention relates to an input device (B) for a controller (S) or for a measuring device, wherein the input device (B) comprises at least one input circuit (1) to provide at least one digital or at least one analog input for a controller (S) or measuring device, wherein the at least one input circuit (1) comprises at least one phase modulation converter (P), wherein the at least one phase modulation converter (P) comprises: - an amplitude modulator (2) with carrier suppression, to which an input signal (SigA) can be supplied on the input side to obtain a carrierless amplitude-modulated signal (SigAM), - an adder (7) to add a carrier signal (SigT90) shifted by 90° to the carrierless amplitude-modulated signal (SigAM) and to obtain a phase-modulated signal (SigPM), - a limiter (11),to which the phase-modulated signal (SigPM) is supplied and with which interference amplitude modulation in the phase-modulated signal (SigPM) can be suppressed, and - a demodulation device (16) to which the signal (SigBA) output by the limiter (11) can be supplied and sampled therein with at least one sampling clock signal (CLK0-CLK3).

The invention relates to a method for calibrating a phase modulation converter (P), wherein the phase modulation converter (1) comprises: - an amplitude modulator (2) with carrier suppression, - an adder (7), - a limiter (11), and - a demodulation device (16) to which the signal (SigBA) output by the limiter (11) can be supplied and demodulated, wherein, during demodulation, a comparison of the signal (SigBA) output by the limiter with a reference signal (SigRF) can be performed, - a calibration switch (S) connected upstream of the adder (7), which can be actuated between a control position in which the adder (7) is connected to the input of the phase modulation converter (1) via the calibration switch (S), and at least one calibration position in which the connection is interrupted, wherein the method comprises,that in step S1 in an adjustment position of the adjustment switch (S) the phase position of the reference signal is preferably dynamically changed and a phase position of the reference signal is found at which an output signal of the demodulation device assumes a calibrated value.

The invention relates to an input device, a controller, a measuring device and a use, the input device for the controller or the measuring device comprising at least one input circuit for providing at least one digital input or analog input for the controller or the measuring device, the at least one input circuit comprising at least one phase modulation converter, the at least one phase modulation converter has: an amplitude modulator with carrier suppression, to the input side of which an input signal can be applied in order to obtain a carrier-free amplitude modulated signal; an adder for adding the carrier signal in the preferred sinusoidal form offset by 90 DEG to the carrier-free amplitude modulation signal to obtain a phase modulation signal; a limiter to which the phase modulation signal is applied, with which interference amplitude modulation in the phase modulation signal can be suppressed; and a demodulator to which the signal output by the limiter is applied, in which the signal output by the limiter is sampled with at least one sampling clock signal.

The invention relates to a method for converting an analog input signal (SigA) into a digital output signal (Sigo), comprising the steps: - the analog input signal (SigA) to be converted is fed to an amplitude modulator (2) with carrier suppression to obtain a carrierless amplitude-modulated signal (SigAM); - a 90° shifted, preferably sinusoidal carrier signal (SigT90) is added in an adder (7) to the amplitude-modulated (SigAM) signal output by the amplitude modulator (2) to obtain a phase-modulated signal (SigPM); - the phase-modulated signal (SigPM) is fed to a limiter (11) by means of which interference amplitude modulation in the phase-modulated signal (SigPM) is suppressed; - the signal output by the limiter (11) (SigBA) is fed to a demodulation device (16) supplied and sampled therein with at least one sampling clock signal (CLK0-CLK3),wherein - the phase of the at least one sampling clock signal (CLK0-CLK3) is dynamically changed to achieve increased resolution. Furthermore, the invention relates to a device (1) for converting an analog input signal into a digital output signal.

An input facility for a controller or measurement apparatus includes at least one input circuit for providing at least one digital or at least one analog input for a controller or measurement apparatus, wherein the at least one input circuit includes at least one phase modulation converter that has an amplitude modulator with carrier suppression to which an input signal can be supplied on the input side in order to obtain a carrierless amplitude-modulated signal, an adder for adding a carrier signal shifted by 90° to the carrierless amplitude-modulated signal and for obtaining a phase-modulated signal, a limiter to which the phase-modulated signal is supplied and with which a noise amplitude modulation in the phase-modulated signal can be suppressed, and a demodulation facility to which the signal output from the limiter is supplied and that can be sampled therein with at least one sampling clock signal.

A technique for generating electronic signals includes processing a respective first-level input signal by each of a plurality of first-level channels, including up-sampling the respective first-level input signal and single-sideband (SSB) modulating the up-sampled first-level input signal to produce a respective first-level output signal. The technique further includes processing a respective second-level input signal by each of a plurality of second-level channels, including up-sampling the respective second-level input signal and SSB-modulating the up-sampled second-level input signal to produce a respective second-level output signal. The plurality of second-level channels is arranged in multiple groups assigned to respective first-level channels, and the technique further includes (i) summing together the second-level output signals of the second-level channels in each group, (ii) providing a group sum as the first-level input signal to the first-level channel to which the group is assigned, and summing together the first-level output signals to provide a composite signal.

The invention relates to a method for calibrating a phase modulation converter and a phase modulation converter, the phase modulation converter (1) comprising: an amplitude modulator (2) with carrier suppression; an adder (7); a limiter (11); and a demodulation device (16) which receives the signal (SigBA) output by the limiter (11) and in which demodulation can be carried out, in which a comparison of the signal (SigBA) output by the limiter with a reference signal (SigRF) can be achieved in the range of demodulation; a calibration switch (S) connected upstream of the adder (7), which calibration switch can be actuated between a control setting, in which the adder (7) is connected via the calibration switch (S) to the input of the phase modulation converter (1), and at least one calibration setting, in which the connection is interrupted.

To provide a driving circuit producing a DSB-SC modulation signal.SOLUTION: A driving circuit comprises a first capacitor. During a sampling operation, the first capacitor is coupled between first and second input terminals. During a transferring operation, an end of the first capacitor receives a voltage, and another end of the first capacitor is coupled to a load. The driving circuit produces a first driving signal to drive the load, the first driving signal comprises a plurality of first portions with a first polarity, and a plurality of second portions with a second polarity opposite to the first polarity. The plurality of first portions and the plurality of second portions form a generalized DSB-SC modulated component of the first driving signal, which is modulated according to an input signal between the first input terminal and the second input terminal.SELECTED DRAWING: Figure 3

Method and device for converting an analog input signal into a digital output signal, wherein the analog input signal is supplied to be converted to the input side of an amplitude modulator with carrier suppression to obtain a carrierless amplitude-modulated signal, an adder adds a sinusoidal carrier signal offset by 90° to the amplitude-modulated signal output by the amplitude modulator to obtain a phase-modulated signal, the phase-modulated signal is supplied to a limiter that is used to suppress interference amplitude modulation in the phase-modulated signal, and the signal output by the limiter is supplied to a demodulator and sampled therein with at least one sampling clock signal, where the phase position of the at least one sampling clock signal is dynamically altered to achieve a higher resolution.

The invention relates to a synchronous modulation system using amplitude modulation, which basically consists of a modulator and a demodulator able to transmit digital signals at double the frequency of its carrier wave. For this purpose, the system uses analog and digital circuits that combine to modulate, separately, the positive half and the negative half of the carrier sine wave, such that in a single cycle of the carrier wave, two different information bits can be sent. The demodulator-modulator unit can be easily combined with other units to form wired or wireless communication systems and even optical or sonic systems with minimal generation of parasitic harmonics, resulting in a minimum bandwidth requirement for operation.

The invention presents methods for generating a feedback signal for an acousto-optical element (105) such that, despite amplification with a nonlinear transfer function, it exhibits the desired signal shape and that, during feedback control of an acousto-optical element (105), the nonlinearities of the amplifier (104) have no effect. The invention offers two methods based on pre-distorting the raw signal—before it is amplified to form the feedback signal—by comparing an amplified signal with the unamplified signal. One method uses the feedback signal itself, and the other uses a reference signal. (Figure 2)

An electromagnetic modulation device may include a receiver configured to receive electromagnetic signals, a digital-to-analog converter configured to continuously generate a modulation signal, a mixer coupled to the receiver and the digital-to-analog converter and configured to encode the electromagnetic signals received by the receiver with the modulation signal generated by the digital-to-analog converter upon receipt of the electromagnetic signals by the receiver, and a transmitter coupled to the mixer and configured to transmit the encoded electromagnetic signals generated by the mixer.

A method for calibrating a phase-modulation converter that includes an amplitude modulator with carrier suppression, an adder, a limiter and a demodulation facility to which a signal output by the limiter is suppliable and demodulated therein, wherein a comparison of the signal output by the limiter with a reference signal occurs in the context of the demodulation, a calibration switch, which is connected upstream of the adder which is actuatable between a control setting in which the adder, is connected via the calibration switch to the input of the phase-modulation converter, and at least one calibration setting in which the is interrupted, where in a calibration setting of the calibration switch, the phase position of the reference signal is changed, preferably dynamically, and a phase position of the reference signal is found at which an output signal of the demodulation facility assumes a calibrated value.