demodulation

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demodulation:

see modulationmodulation,
in communications, process in which some characteristic of a wave (the carrier wave) is made to vary in accordance with an information-bearing signal wave (the modulating wave); demodulation is the process by which the original signal is recovered from the wave
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demodulation

[dē‚mäj·ə′lā·shən]

(communications)

The recovery, from a modulated carrier, of a signal having substantially the same characteristics as the original signal.

demodulation

Electronics the act or process by which an output wave or signal is obtained having the characteristics of the original modulating wave or signal; the reverse of modulation

Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

demodulation

(communications)

To recover the signal from the carrier. For example, in a radio broadcast using amplitude modulation the audio signal is transmitted as the mean amplitude of a radio-frequency carrier so demodulation requires a circuit which measures the amplitude and filters out the carrier. There are many other kinds of modulation and corresponding demodulation.

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demodulate

To isolate a data signal from a carrier wave. The demodulation circuit uses the unmodulated carrier as a reference signal and compares it to the received signal. See modulation and carrier.

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References in periodicals archive ?

'We are pleased to report another industry-first of 3GPP RF demodulation and RRM test cases,' said Muthu Kumaran, senior director at Keysight Technologies.

Keysight, Qualcomm Collaborate to Obtain Industry-First GCF Validation of 5G Radio Frequency (RF) Demodulation and Radio Resource Management (RRM) Test Cases

Since BPSK symbols are real value, the real part y = Re{[y.sub.D]} can be employed in demodulation. It is a real Gaussian random variable with zero mean and variance [mathematical expression not reproducible].

Power Optimized Single Relay Selection with an Improved Link-Adaptive-Regenerative Protocol

Figures (6,7) shows the RF spectrum of the OFDM signal at a CP of 1/32, the power of the RF is measured at -10 dBm after the OFDM modulation and at 39dBm after the OFDM demodulation. Figure (8) shows the BER as a function of the fiber launch power per channel after 1000 km transmission for Dual polarization system, which gives the lower BER at input power of 14 dBm means increasing input power leads to decrease the BER.

Enhancing the dual polarization O-OFDM systems using different effective areas for the optical fiber

As the attenuation coefficient [[alpha].sub.j] increases with increasing the magnetic field, the demodulation depths of dips (A) and (D) and peak (C) are strengthened; however, the demodulation depth of dip (B) is weakened.

A Highly Sensitive Intensity-Modulated Optical Fiber Magnetic Field Sensor Based on the Magnetic Fluid and Multimode Interference

Hence, we can detect gear fault via frequency demodulation analysis.

Planetary Gearbox Fault Diagnosis via Torsional Vibration Signal Analysis in Resonance Region

Based on the entire sparse graph, the demodulation or decoding can use not only the knowledge of channels, but also parity-check information.

Performance improvement of iterative demodulation and decoding for spatially coupling data transmission by joint sparse graph

QUADRATURE DEMODULATION OF AM RADIO SIGNAL SUPERIMPOSED WITH HV NOISE

Noise suppression system for AM radio receiver using quadrature component of receiving signal

As mentioned before, the demodulation of a single interferogram often involves a combination of methods (GA + Zernike, PSO + Zernike, Neuronal networks + others, etc.).

FSD-HSO Optimization Algorithm for Closed Fringes Interferogram Demodulation

- Many channel-filtering, demodulation & decoding, triggering, display, and upgrade features

Intel Chooses Averna for Testing DOCSIS 3.1 Chipsets

Signal demodulation for AM and FM extends to a time-domain display in addition to audio demodulation.

Saelig Introduces 6GHz Handheld RF Spectrum Analyzers

To extract the weak information leakage from the amplitude modulation signal, the authors used an incoherent demodulation approach.

Practical electromagnetic disturbance analysis on commercial contactless smartcards