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Packing Escapement and Velocity Data

IP.com Disclosure Number: IPCOM000074451D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Byram, JC: AUTHOR

Abstract

Velocity and escapement data for all characters, both upper and lower case, used in a proportional escapement system are stored in a sixty-four byte table having eight bits per byte. For most characters only the differences in velocity and escapement values between upper and lower case are used which allows packing of ten bits of required data into an eight-bit byte.

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Packing Escapement and Velocity Data

Velocity and escapement data for all characters, both upper and lower case, used in a proportional escapement system are stored in a sixty-four byte table having eight bits per byte. For most characters only the differences in velocity and escapement values between upper and lower case are used which allows packing of ten bits of required data into an eight-bit byte.

This is readily accomplished where almost all lower case escapements for particular characters are less than, or equal to, the upper case escapements for the characters, and where the upper case escapement of a character is not more than three units greater than the lower case value. In this instance, the lower case of a character may be represented by three bits and only two more bits are required to store the difference between the upper and lower case escapement values. Where the majority of velocities for the upper case of a character are greater than, or equal to, the lower case and where the upper case velocity of a character does not exceed the lower case velocity by more than one increment of impact, the lower case velocity of a character may be represented by two bits and the difference between the lower and upper case velocities represented by one bit.

For example, if "s" has an escapement value of six and requires a medium velocity and "S" has an escapement of seven and requires a high velocity, the first two bits represent the velocity of "s" and the t...