IPIQ

ELECTRICITY

H04

ELECTRIC COMMUNICATION TECHNIQUE

H04N

PICTORIAL COMMUNICATION, e.g. TELEVISION

21/00

Selective content distribution, e.g. interactive television or video on demand [VOD]

H04N21/40

Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof

H04N21/41

Structure of client; Structure of client peripherals

H04N21/422

Input-only peripherals; , i.e. input devices connected to specially adapted client devices; , e.g. global positioning system [GPS]

H04N21/42204

User interfaces specially adapted for controlling a client device through a remote control device; Remote control devices therefor

H04N21/42206

characterized by hardware details

H04N21/42212

Specific keyboard arrangements

H04N21/42218

for mapping a matrix of displayed objects on the screen to the numerical key-matrix of the remote control