(under subclass 571) Subject matter including an apparatus for modifying the signal by the selective insertion or deletion of signal portions or replacement by further signals.
(1) Note. Fading and chroma keying are examples of effects produced by devices classified herein.
SEE OR SEARCH CLASS
340, Communications: Electrical,
700+, for selective visual display communication systems.
352, Optics: Motion Pictures,
85, for special effects in motion picture photography.
