DIFF Subgroup
H04N 7/16 Analogue secrecy systems; Analogue subscription systems
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Television systems > Analogue secrecy systems; Analogue subscription systems
CPC:
Television systems (details H04N3/00, H04N5/00; methods or arrangements, for coding, decoding, compressing or decompressing digital video signals H04N19/00; selective content distribution H04N21/00) > Analogue secrecy systems; Analogue subscription systems
CPC subdivides this area 3x more granularly than IPC with 3 additional codes.
3 codes are CPC-only extensions.
IPC defines codes here since 1985.
Child Classifications
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- H04N 7/167 Systems rendering the television signal unintelligible and subsequently intelligible since 1985 +1 CPC IPC+CPC Available in IPC and CPC
- H04N 7/173 with two-way working, e.g. subscriber sending a programme selection signal since 1985 +5 CPC IPC+CPC Available in IPC and CPC