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Browse Prior Art Database

SIMULTANEOUS VOICE AND DATA TRANSMISSION SYSTEM

IP.com Disclosure Number: IPCOM000005636D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2001-Oct-23
Document File: 2 page(s) / 81K

Publishing Venue

Motorola

Related People

Steven D. Bromley: AUTHOR [+2]

Abstract

This system allows simultaneous voice and data transmission over a single narrow band RF channel. The transmission unit includes generally avoice and data processing and mixing unit and a modulation and transmitter unit.

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6% MOTOROLA Technical Developments October 1987

SIMULTANEOUS VOICE AND DATA TRANSMISSION SYSTEM

by Steven D. Bromley and James F. Herrman

   This system allows simultaneous voice and data transmission over a single narrow band RF channel. The transmission unit includes generally avoice and data processing and mixing unit and a modulation and transmitter unit.

   The voice and data processing and mixing unit can receive both voice information as bounded within a known first frequency range (such as between 300 Hz and 3400 Hz) and digitized data. The voice and data proc- essing and mixing unit serves to shift the voice information upwards in frequency to a second frequency range (for instance, between 1500 Hz and 4600 Hz) and to invert this signal. This unit then limits the digitized data to a third frequency range located below the second frequency range (for instance, between 0 Hz and 1500 Hz) and sums the voice information and data signals together for simultaneous transmission.

The modulation and transmitter unit operates to modulate a selected RF carrier signal with this summed combination and transmits the resultant signal to the intended destination.

   An appropriate reception and demodulation unit can receive this transmitted signal and extract therefrom the summed voice information and data signal and separate the low frequency components from the high fre- quency components of this signal to segregate the data information from the voice information, The data infor- mation can then be recovered in the...