DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER

Introduced: September 1968

Classification Context

Section:: ELECTRICITY
Class:: ELECTRONIC CIRCUITRY
Subclass:: DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER

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).

Filing statistics

IPC subclass H03D recorded 4,960 patent applications worldwide between 2013 and 2023. Annual filings declined from 574 in 2013 to 386 in 2023 (-33%). The most active applicants in class H03 are QUALCOMM (5,625 applications), SAMSUNG ELECTRONICS COMPANY (5,496 applications) and MURATA MANUFACTURING COMPANY (5,478 applications).

Source: EPO PATSTAT, worldwide filings

In class comparison

H03D ranks 8th of 10 subclasses with filings in H03, with 4,960 applications between 2013 and 2023, 1.5% of the class. Annual filings declined 33% from 2013 to 2023, below the class as a whole (+15%).

Subclasses of class H03 by patent applications, 2013–2023
Rank	Subclass	Title	Applications	Share
1	H03K, Pulse Technique	Pulse Technique	110,917	32.9%
2	H03M, Coding, Decoding or Code Conversion, in General	Coding, Decoding or Code Conversion, in General	65,789	19.5%
3	H03H, Impedance Networks, e.g. Resonant Circuits; Resonators	Impedance Networks, e.g. Resonant Circuits; Resonators	56,431	16.7%
4	H03F, Amplifiers	Amplifiers	50,749	15.0%
5	H03L, Automatic Control, Starting, Synchronisation or Stabilisation of Generators of Electronic Oscillations or Pulses	Automatic Control, Starting, Synchronisation or Stabilisation of Generators of Electronic Oscillations or Pulses	21,048	6.2%
6	H03G, Control of Amplification	Control of Amplification	13,146	3.9%
7	H03B, Generation of Oscillations, Directly or by Frequency-Changing, by Circuits Employing Active Elements Which Operate in a Non-Switching Manner; Generation of Noise by Such Circuits	Generation of Oscillations, Directly or by Frequency-Changing, by Circuits Employing Active Elements Which Operate in a Non-Switching Manner; Generation of Noise by Such Circuits	11,859	3.5%
8	H03D	Demodulation or Transference of Modulation From One Carrier to Another	4,960	1.5%
9	H03C, Modulation	Modulation	1,283	0.4%
10	H03J, Tuning Resonant Circuits; Selecting Resonant Circuits	Tuning Resonant Circuits; Selecting Resonant Circuits	1,256	0.4%

Source: EPO PATSTAT, worldwide filings

Additional Content

Glossary

Homodyne synchrodyne or zero-IF receiver A receiver in which the local oscillator (LO) frequency is set to the same frequency as the received RF carrier frequency resulting in direct conversion of the received signal to a baseband (or zero IF) frequency for information recovery. In a near-zero IF receiver, the LO frequency is set very close to the carrier frequency of the RF signal. Superheterodyne receiver superheterodyne receivers A receiver in which a received RF signal is converted to an intermediate frequency (IF) by at least one stage of frequency conversion (e.g. a 'mixer' stage which forms the product of the RF signal and a local oscillator signal)

Limiting references

Masers, lasers Circuits capable of acting both as modulator and demodulator; balanced modulators , Details applicable to both modulators and frequency changers Demodulating pulses which have been modulated with a continuously variable signal Transforming types of pulse modulation Relay systems, e.g. repeater stations Demodulators adapted for digitally modulated-carrier systems. Synchronous demodulators adapted for colour television Phase locked loops; phase comparators therein -

Related Keywords

CIRCUITS for demodulating sinusoidal oscillationsCOMPARING of phase or frequency of two independent electric oscillationsCONVERSION of kind for demodulationDEMODULATION of electric oscillationsFREQUENCY changing in circuits for transference of modulated signalsSYNCHRODYNE electric circuitsdemodulating for TELECOMMUNICATION

8 direct subcodes

Child Classifications

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H03D 1/00 Demodulation of amplitude-modulated oscillations
H03D 11/00 Super-regenerative demodulator circuits
H03D 13/00 Circuits for comparing the phase or frequency of two mutually-independent oscillations
H03D 3/00 Demodulation of angle-modulated oscillations
H03D 5/00 Circuits for demodulating amplitude-modulated or angle-modulated oscillations at will
H03D 7/00 Transference of modulation from one carrier to another, e.g. frequency-changing
H03D 9/00 Demodulation or transference of modulation of modulated electromagnetic waves
H03D 99/00 Subject matter not provided for in other groups of this subclass

Top Applicants

Top 10 applicants by patent filingsfor class H03, 2013–2023, worldwide · Source: EPO PATSTAT

QUALCOMM US 5,625
SAMSUNG ELECTRONICS COMPANY KR 5,496
MURATA MANUFACTURING COMPANY JP 5,478
HUAWEI TECHNOLOGIES COMPANY CN 3,383
INTEL CORPORATION US 3,091
TEXAS INSTRUMENTS US 3,070
MURATA MANUFACTURING COMPANY 2,722
SKYWORKS SOLUTIONS US 2,290
SEIKO EPSON CORPORATION 2,177
IBM (INTERNATIONAL BUSINESS MACHINES CORPORATION) US 2,158