CPC Subclass Not Allocatable
H03D DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER (masers, lasers H01S; circuits capable of acting both as modulator and demodulator H03C; details applicable to both modulators and frequency-changers H03C; demodulating pulses H03K9/00; transforming types of pulse modulation H03K11/00; coding, decoding or code conversion, in general H03M; repeater stations H04B7/14; demodulators adapted for AC systems of digital information transmission H04L27/00; synchronous demodulators adapted for colour television H04N9/66)
Description
H03D covers circuits and methods for demodulating modulated signals and converting modulation from one carrier frequency to another. This includes detection of amplitude-modulated, frequency-modulated, and phase-modulated signals, as well as frequency conversion and mixing operations in radio and communication receivers. The classification encompasses detector circuits, demodulators, frequency converters, and heterodyne systems used in telecommunications, broadcasting, and radar applications. Excluded are modulation circuits themselves (H03C) and complete receiver systems (H04B).
9 direct subcodes
Child Classifications
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- H03D 1/00 Demodulation of amplitude-modulated oscillations (H03D5/00, H03D9/00, H03D11/00 take precedence)
- H03D 11/00 Super-regenerative demodulator circuits
- H03D 13/00 Circuits for comparing the phase or frequency of two mutually-independent oscillations
- H03D 2200/00 Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
- H03D 3/00 Demodulation of angle-, modulated oscillations (H03D5/00, H03D9/00, H03D11/00 take precedence)
- H03D 5/00 Circuits for demodulating amplitude-modulated or angle-modulated oscillations at will (H03D9/00, H03D11/00 take precedence)
- H03D 7/00 Transference of modulation from one carrier to another, e.g. frequency-changing (H03D9/00, H03D11/00 take precedence; dielectric amplifiers, magnetic amplifiers, parametric amplifiers used as a frequency-changers H03F)
- H03D 9/00 Demodulation or transference of modulation of modulated electromagnetic waves (demodulating light, transferring modulation in light waves G02F2/00)
- H03D 99/00 Subject matter not provided for in other groups of this subclass