Apparatus and method for combining digital and analog television signals
AssigneeADC Telecommunications, Inc.
InventorDavid J. Neff
Life of this patent
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Abstract
An adjacent channel combiner combines an analog television channel with an upper adjacent digital television channel using practical filter designs. An aural signal of the analog television channel is combined after both a visual signal and a digital signal have been combined. A directional filter combines the visual and digital signals and a diplexer or other means is used for combining the aural signal with the combined visual and digital signal.
Claims21
A channel combiner, comprising:
- a directional filter for combining a digital signal of a digital television channel with a visual signal of an analog television channel;
- and
- a diplexer for combining the combined digital and visual signal with a separate aural signal of the analog television channel for transmission using a common path.
A method of combining an analog television channel with an immediately upper adjacent digital television channel, the method comprising:
- combining a digital signal of the digital television channel with a visual signal of the analog television channel;
- and
- combining an aural signal of the analog television channel with the combined digital and visual signal for transmission using a common path.
A method of combining an analog television channel with an immediately upper adjacent digital television channel, the method comprising the steps of:
- receiving a digital signal operating within the digital television channel;
- receiving a visual signal operating within the analog television channel;
- combining the digital signal with the visual signal;
- receiving the combined digital and visual signal;
- receiving a separate aural signal operating within the analog television channel;
- and
- combining the aural signal with the combined digital and visual signal for transmission using a common path.
A television transmission system comprising:
- an analog transmitter for providing a visual signal and a separate aural signal, wherein both signals occupy an analog television channel;
- a digital transmitter for providing a digital signal, wherein the digital signal occupies a digital television channel that is upper adjacent to the analog television channel;
- an adjacent channel combiner for combining the analog television channel with the digital television channel, wherein the aural signal is combined after both the visual and digital signals have been combined;
- a common transmission line for receiving the combined analog and digital channels;
- and
- an antenna for transmitting the combined analog and digital channels.
A channel combiner, comprising:
- means for combining a digital signal with a visual signal, wherein the digital signal occupies an upper adjacent digital television channel and the visual signal occupies a first portion of a lower adjacent analog television channel;
- and
- means for combining the combined digital and visual signal with a separate aural signal that occupies a second portion of the lower adjacent analog television channel for transmission using a common path.
Dependencies are inferred from the claim text.