Browse Prior Art Database

Transmitting Audio on a Composite TV Waveform

IP.com Disclosure Number: IPCOM000090933D
Original Publication Date: 1969-Aug-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Belleson, JG: AUTHOR [+2]

Abstract

The system employs a composite video signal in which the sync pulses of such signal are modulated by the audio. Composite video signal 1 is applied to the base of an input transistor. The audio signal and bias 2 are applied to the base of another connecting transistor so that the sync pulses of signal 1 are modulated by the audio to produce video signal 3. At the receiving end, video signal 3 can be applied to the TV monitor. In addition, it is applied to the base of a transistor with the other connecting transistor having a bias 4 applied to it. This removes the video portion of the signal to produce a waveform shown as 5. This is then passed through a low-pass filter to produce audio output 6.

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Transmitting Audio on a Composite TV Waveform

The system employs a composite video signal in which the sync pulses of such signal are modulated by the audio. Composite video signal 1 is applied to the base of an input transistor. The audio signal and bias 2 are applied to the base of another connecting transistor so that the sync pulses of signal 1 are modulated by the audio to produce video signal 3. At the receiving end, video signal 3 can be applied to the TV monitor. In addition, it is applied to the base of a transistor with the other connecting transistor having a bias 4 applied to it. This removes the video portion of the signal to produce a waveform shown as 5. This is then passed through a low-pass filter to produce audio output 6.

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