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DIFF Subgroup
H04N 5/92

Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

Details of television systems > Television signal recording > Television signal processing therefor > Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback

CPC:

Details of television systems (scanning details or combination thereof with generation of supply voltages H04N3/00) > Television signal recording > Television signal processing therefor > Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback

Additional Content IPC

Transformation of the colour television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback

Of 7 combined children, 4 exist in both systems.

1 codes are CPC-only extensions, 2 exist only in IPC.

1 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1995.

Child Classifications

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  • H04N 5/921 by recording or reproducing the baseband signal since 1995 IPC+CPC Available in IPC and CPC
  • H04N 5/922 by modulation of the signal on a carrier wave, e.g. amplitude or frequency modulation since 1995 IPC only IPC only
  • H04N 5/923 using preemphasis of the signal before modulation and deemphasis of the signal after demodulation since 1995 IPC+CPC Available in IPC and CPC
  • H04N 5/924 using duty cycle modulation since 1995 IPC only IPC only
  • H04N 5/928 the sound signal being pulse code modulated and recorded in time division multiplex with the modulated video signal since 1995 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