초록 ▼

The apparatus and method is shown for transmitting one or more audio frequency signals on a television video signal including an encoder comprised of a pulse modulator responsive to the audio frequency signals and a combiner to combine modulated pulses from the modulator with the video signal. Also

The apparatus and method is shown for transmitting one or more audio frequency signals on a television video signal including an encoder comprised of a pulse modulator responsive to the audio frequency signals and a combiner to combine modulated pulses from the modulator with the video signal. Also shown is a decoder for use with video signals output from above encoding apparatus and method for decoding the modulated pulses to recover the audio frequency signals.

대표청구항 ▼

An apparatus for combining a video type signal with samples of a secondary signal, said video signal having a varying horizontal line rate, a secondary signal sampling and modulation circuit, said secondary signal sampling and modulation circuit operating at a first rate, said first rate being depen

An apparatus for combining a video type signal with samples of a secondary signal, said video signal having a varying horizontal line rate, a secondary signal sampling and modulation circuit, said secondary signal sampling and modulation circuit operating at a first rate, said first rate being dependent on said varying horizontal line rate of said video signal, a timing circuit, a switch circuit, a combining circuit, said switch circuit applying said modulated samples to said combining circuit when appropriate, said timing circuit operating at a second rate, said second rate being dependent on said video signal, said second rate having an average, said average of said second rate equalling said first rate of operation of said secondary signal sampling and modulation circuit said timing circuit, said switch circuit, and said combining circuit encoding samples of said secondary signal with said video signal.