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Browse Prior Art Database

Data Transmission System

IP.com Disclosure Number: IPCOM000082144D
Original Publication Date: 1974-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Maling, GC: AUTHOR [+2]

Abstract

This arrangement provides for transmission acoustical data. See Fig. 1. Data are transmitted from a spectrum analyzer 1 through a specially-constructed interface 2, an IBM 2741 terminal 3, to a data set 4 and a remote time sharing computer 5. In this implementation the programming language used is APL/360.

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Data Transmission System

This arrangement provides for transmission acoustical data. See Fig. 1. Data are transmitted from a spectrum analyzer 1 through a specially-constructed interface 2, an IBM 2741 terminal 3, to a data set 4 and a remote time sharing computer 5. In this implementation the programming language used is APL/360.

The key feature is that the twelve-bit output of the accoustical analyzer can always be encoded into two valid six-bit characters, because all control codes (e.g., tab, return, index, EOT, shift case) contain both the "8" bit and the "4" or "2" bit. See Fig. 2 for the encoding.

The interface contains a sixteen-bit shift register which is designed to shift eighteen bits by additional logic, which supplies the fill bit of the shift register.

The system is bridged across the 2741 data out line just before the Electronic Industries Association (EIA) interface, and no modifications to the 2741 are necessary. The acoustical system, although synchronous, appears to the system identical to keyboard input which comes at a regular rate. Decoding of the two-character data format into a numerical sound pressure level value is done using an ENTER 2 function.

Another feature of this arrangement is that by overlapping the data transmission and integrating time of the analyzer, realtime analysis of a weighted sound level is possible for integration times greater than 1/4 second.

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