IPC Subgroup
H04N 9/64 Circuits for processing colour signals
Introduced: January 1985
Last revised: January 2023
Full Title
Details of colour television systems > Circuits for processing colour signals
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- PICTORIAL COMMUNICATION, e.g. TELEVISION
Additional Content
Circuits for processing the brightness signal and the chrominance signal relative to each other Camera processing pipelines for processing colour signals
8 direct subcodes
Child Classifications
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- H04N 9/65 for synchronous modulators
- H04N 9/66 for synchronous demodulators
- H04N 9/67 for matrixing
- H04N 9/68 for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
- H04N 9/7 for colour killing
- H04N 9/72 for reinsertion of DC and slowly varying components of colour signals
- H04N 9/73 Colour balance circuits, e.g. white balance circuits or colour temperature control
- H04N 9/74 for obtaining special effects
Top Applicants
Top 10 applicants by patent filingsfor class H04, 2013–2023, worldwide · Source: EPO PATSTAT
- QUALCOMM US 97,396
- HUAWEI TECHNOLOGIES COMPANY CN 96,502
- SAMSUNG ELECTRONICS COMPANY KR 86,981
- TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 55,869
- HUAWEI TECHNOLOGIES COMPANY 55,349
- LG ELECTRONICS KR 53,649
- CANON 33,341
- SONY CORPORATION JP 32,761
- ZTE CORPORATION CN 32,274
- GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION 28,327