Browse Prior Art Database

Audio Signal Multiplexing

IP.com Disclosure Number: IPCOM000042350D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Kummer, DA: AUTHOR [+2]

Abstract

In a home computer system, a multiplexer selects audio signals from a plurality of sources which provide different signal levels. The multiplexer system is arranged to provide a fixed level output irrespective of the source selected. Audio signals are applied to a 4-to-1 multiplexer 1 from inputs 2 through 5 via resistors 6 through 9. Control signals from the computer I/O port at inputs 10 and 11 select one input for passage through multiplexer 1 to amplifier 12. The values of the resistors, with respect to the input impedance of amplifier 12, are selected such that input signals of different peak-to-peak amplitude provide amplifier output signals of a fixed peak-to-peak level.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Audio Signal Multiplexing

In a home computer system, a multiplexer selects audio signals from a plurality of sources which provide different signal levels. The multiplexer system is arranged to provide a fixed level output irrespective of the source selected. Audio signals are applied to a 4-to-1 multiplexer 1 from inputs 2 through 5 via resistors 6 through 9. Control signals from the computer I/O port at inputs 10 and 11 select one input for passage through multiplexer 1 to amplifier 12. The values of the resistors, with respect to the input impedance of amplifier 12, are selected such that input signals of different peak-to-peak amplitude provide amplifier output signals of a fixed peak-to-peak level.

1