Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Auto Ranging Hand Control Unit for Multi-media Viewing

IP.com Disclosure Number: IPCOM000109344D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2005-Mar-23
Document File: 2 page(s) / 106K

Publishing Venue

IBM

Related People

Rivenburg, DB: AUTHOR

Abstract

Described is a technique and hardware auto-ranging hand control unit (HCU) implementation for multi-media viewing on a single monitor. The technique enables both a television (TV) and a personal computer (PC) to share the same monitor by compensating for viewing distances.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Auto Ranging Hand Control Unit for Multi-media Viewing

       Described is a technique and hardware auto-ranging hand
control unit (HCU) implementation for multi-media viewing on a single
monitor.  The technique enables both a television (TV) and a personal
computer (PC) to share the same monitor by compensating for viewing
distances.

      In prior art, using the same monitor to view a TV, or to view
PC functions, presented problems due to the differences in viewing
requirements.  Typically, the TV screen is too large for practical PC
use.  A PC is typically viewed from two feet while a TV is typically
viewed from five to twenty feet.  So as to provide viewing
compatibility, a way was needed to determine the distance between the
monitor and the user so as to adjust the on-screen size accordingly.

      The concept described herein is designed to provide an
autoranging feature within a HCU so that the the distance between a
TV or a PC and the viewer can be quickly determined.  The design is
such that the operating system, or the application software, used in
the PC will dictate how the determined information is to be used.

      The auto-ranging HCU operates in conjunction with separate
media control module (MCM) software.  The HCU contains an ultrasonic
device, similar to auto-focus features in cameras, so that both
auto-ranging and information signals can be sent to the PC.  A push
button is located on the front to enable the user to select the
default menu whenever desired.  A low-power light-emitting diode
(LED) is mounted on the front to indicate the proper transmission
while the user is operating the HCU. The LED will flash during a low
battery condition and the unit will send a message to the processor.

      In default mode of operation, the HCU provides an on-screen
menu at the monitor in PC mode.  The distance from the monitor to the
HCU is directly proportional, within specified minimum and maximum
menu sizes.  The sizes conform to the algorithm Y = mx + b, where Y
is the size of the screen, m is the scaling factor, x is the distance
and b is the offset value.

      A touch-sensitive tablet is contained on the HCU in the form of
a resistive substrate.  Nylon line is utilized as a stand-off between
the resistive substrate and a conductive bladder.  Alternate drive
voltages are supplied to the resistive substrate in both the 'X' and
'Y' directions at a rate of 125 Hz.  With pressure applied to a cover
sheet control p...