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Analog QAM is used in: NTSC and PAL analog color television systems, where the I- and Q-signals carry the components of chroma (colour) information. The QAM carrier phase is recovered from a special colorburst transmitted at the beginning of each scan line. C-QUAM ("Compatible QAM") is used in AM stereo radio to carry the stereo difference ...
Demodulation is extracting the original information-bearing signal from a carrier wave. A demodulator is an electronic circuit (or computer program in a software-defined radio) that is used to recover the information content from the modulated carrier wave. [1] There are many types of modulation so there are many types of demodulators.
The orthogonality allows for efficient modulator and demodulator implementation using the FFT algorithm on the receiver side, and inverse FFT on the sender side. Although the principles and some of the benefits have been known since the 1960s, OFDM is popular for wideband communications today by way of low-cost digital signal processing ...
A demodulator (sometimes detector) is a circuit that performs demodulation, the inverse of modulation. A modem ... In the case of PSK, ASK or QAM, ...
MaxLinear's MxL683 Tuner + ISDB-T Demodulator SoC Powers "Time Shift" Televisions CARLSBAD, Calif.--(BUSINESS WIRE)-- MaxLinear Inc. (NYS: MXL) , a leading provider of integrated radio frequency ...
In the presence of an arbitrary phase-shift introduced by the communications channel, the demodulator (see, e.g. Costas loop) is unable to tell which constellation point is which. As a result, the data is often differentially encoded prior to modulation. BPSK is functionally equivalent to 2-QAM modulation.
A modulator-demodulator, commonly referred to as a modem, ... Additional improvements were introduced by quadrature amplitude modulation (QAM) encoding, ...
IQ modulation and demodulation. LO is the local oscillator - the carrier sine wave being modulated I(t) and Q(t) are the time-series data for the in-phase and quadrature components.