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IPC Subgroup
H04N 5/92

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

Introduced: January 1980

Last revised: January 2006

Full Title

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

Classification Context

Section:
ELECTRICITY
Class:
ELECTRIC COMMUNICATION TECHNIQUE
Subclass:
PICTORIAL COMMUNICATION, e.g. TELEVISION

Additional Content

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

6 direct subcodes

Child Classifications

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  • H04N 5/921 by recording or reproducing the baseband signal
  • H04N 5/922 by modulation of the signal on a carrier wave, e.g. amplitude or frequency modulation
  • H04N 5/923 using preemphasis of the signal before modulation and deemphasis of the signal after demodulation
  • H04N 5/924 using duty cycle modulation
  • H04N 5/926 by pulse code modulation
  • H04N 5/928 the sound signal being pulse code modulated and recorded in time division multiplex with the modulated video signal

Top Applicants

Top 10 applicants by patent filingsfor 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