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ALPHA-NUMERIC DATA GENERATOR WITH DTMF INPUT AND VOICE FEEDBACK

IP.com Disclosure Number: IPCOM000005711D
Original Publication Date: 1988-Oct-01
Included in the Prior Art Database: 2001-Oct-30
Document File: 2 page(s) / 95K

Publishing Venue

Motorola

Related People

Kai Siwiak: AUTHOR

Abstract

Alpha-numeric data for a paging transmitter is generated from DTMF input as from a telephone line. A user-friendly dataentry method from a standard DTMF telephone and synthesized voice feedback are provided and the need for operator assistance for alpha-numeric input to a paging system is eliminated. A rudimentary but full featured system can be built for under one hundred dollars. This system removes a major obstacle to the wide-spread use of alphanumeric pagers.

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MOTOROLA Technical Developments Volume 8 October 1988

ALPHA-NUMERIC DATA GENERATOR WITH DTMF INPUT AND VOICE FEEDBACK by Kai Siwiak

   Alpha-numeric data for a paging transmitter is generated from DTMF input as from a telephone line. A user-friendly dataentry method from a standard DTMF telephone and synthesized voice feedback are provided and the need for operator assistance for alpha-numeric input to a paging system is eliminated. A rudimentary but full featured system can be built for under one hundred dollars. This system removes a major obstacle to the wide-spread use of alphanumeric pagers.

   As shown in Figure 1, an analog phone line input enters a digitally controlled analog switch. DTMF data is decoded by the SSl202 (or similar) DTMF to binary decoder. The binary data (2 or 8 or equivalent) is input to a microprocessor ( A P) with program memory such as a Motorola development type MC1468705G2. The data is processed as described later and converted to ASCII for input to a speech synethesizer like an CTS256AL2. That speech synthesizer drives a SP0256AL2 voice synethesizer which has synthesized analog speech as an output. The speech is filtered, amplified and send to the user as voice feedback on the phone line through the analog switch. A second output from the IC P sends the formatted binary alphanumeric message to a pag- ing transmitter for RF transmission to an alpha-numeric pager.

/ SATA ------_-_-

- SPEECH : VOICE

SrNTHEslZER ; SYNTHESIZER

I

2OF8/ IceI I VOICE SYNIHESIZER

UNE

INPUT

BINARY APLHA-NUMERIC DATA,FO&W&' FOR

A high quality system would replace the inexpensive synthesizer chips with a good quality voice synethesizer The key to successful alpha-numeric entry from a standard DTMF telephone key pad is a simple recipe, voice feedback, and message editing capabilities. Those capabilities are provided by programming in the &P and are described as follows.

0 Motorola, Inc. 1988 30

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Technical Developments Volume 8 October 1...