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DIFF Subgroup
H04N 9/64

Circuits for processing colour signals (H04N9/77 takes precedence; camera processing pipelines for processing colour signals H04N23/84)

Introduced: January 1985

Title

Titles differ between systems:

IPC: Circuits for processing colour signals

CPC: Circuits for processing colour signals (H04N9/77 takes precedence; camera processing pipelines for processing colour signals H04N23/84)

Full Title

Full titles differ between systems:

IPC:

Details of colour television systems > Circuits for processing colour signals

CPC:

Details of colour television systems > Circuits for processing colour signals (H04N9/77 takes precedence; camera processing pipelines for processing colour signals H04N23/84)

Additional Content IPC

Circuits for processing the brightness signal and the chrominance signal relative to each other Camera processing pipelines for processing colour signals

Of 15 combined children, 8 exist in both systems.

7 codes are CPC-only extensions.

5 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1985.

Child Classifications

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  • H04N 9/641 CPC only CPC only
  • H04N 9/642 CPC only CPC only
  • H04N 9/643 CPC only CPC only
  • H04N 9/645 CPC only CPC only
  • H04N 9/646 CPC only CPC only
  • H04N 9/647 CPC only CPC only
  • H04N 9/648 CPC only CPC only
  • H04N 9/65 for synchronous modulators since 1985 IPC+CPC Available in IPC and CPC
  • H04N 9/66 for synchronous demodulators since 1985 IPC+CPC Available in IPC and CPC
  • H04N 9/67 for matrixing (camera processing pipelines for matrixing of colour signals H04N23/85) since 1985 IPC+CPC Available in IPC and CPC
  • H04N 9/72 for reinsertion of DC and slowly varying components of colour signals (camera processing pipelines for reinsertion of DC or slowly varying components of colour signals H04N23/87) since 1985 IPC+CPC Available in IPC and CPC
  • H04N 9/73 Colour balance circuits, e.g. white balance circuits or colour temperature control (camera processing pipelines for colour balance H04N23/88) since 1985 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class H04,2013–2023, worldwide · Source: EPO PATSTAT

  1. QUALCOMM US 97,396
  2. HUAWEI TECHNOLOGIES COMPANY CN 96,502
  3. SAMSUNG ELECTRONICS COMPANY KR 86,981
  4. TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 55,869
  5. HUAWEI TECHNOLOGIES COMPANY 55,349
  6. LG ELECTRONICS KR 53,649
  7. CANON 33,341
  8. SONY CORPORATION JP 32,761
  9. ZTE CORPORATION CN 32,274
  10. GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION 28,327

Top Applicants (CPC)

Class H04,2013–2023, worldwide · Source: EPO PATSTAT

  1. HUAWEI TECHNOLOGIES COMPANY CN 101,476
  2. QUALCOMM US 101,139
  3. SAMSUNG ELECTRONICS COMPANY KR 96,655
  4. TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) SE 57,744
  5. LG ELECTRONICS KR 55,253
  6. HUAWEI TECHNOLOGIES COMPANY 54,181
  7. SONY CORPORATION JP 35,309
  8. ZTE CORPORATION CN 32,950
  9. INTEL CORPORATION US 27,533
  10. GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORPORATION CN 27,498