Browse Prior Art Database

Video Beeper

IP.com Disclosure Number: IPCOM000120669D
Original Publication Date: 1991-May-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 45K

Publishing Venue

IBM

Related People

Beers, GE: AUTHOR [+4]

Abstract

Disclosed is a circuit that allows personal computer users in a noisy environment or who are hearing impaired to be visually informed when the audio beeper is active. This circuit is designed to redirect the speaker data signal to the video display.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 94% of the total text.

Video Beeper

      Disclosed is a circuit that allows personal computer users in a
noisy environment or who are hearing impaired to be visually informed
when the audio beeper is active.  This circuit is designed to
redirect the speaker data signal to the video display.

      This speaker data signal redirection is accomplished by
"attaching" the speaker signal to the display control logic signals
going to the computer display.  When the beeper is active this will
produce rolling lines of color, brightness, or blackness when the
speaker-data signal is active.  This will inform the user of an
attention situation without sound, without corrupting what is on the
screen, and without requiring any software modifications.

      This invention provides a simple, cost effective, and software
compatible means of converting the audio beep into a pattern on the
display.

      A typical embodiment is shown in the figure.  The VIDEO_BEEP
signal is controlling the GREEN analog output of the video
digital-to-analog converter (DAC) with the circuit shown.  When the
VIDEO_BEEP is low, the tri-state buffer is in the high impedance
state, and the RED, GREEN, and BLUE signals are not affected.  When
the VIDEO_BEEP signal is high, a video logic signal like BLANK
signal can be used to modify the video beep visual characteristics to
improve synchronization, etc. When the tri-state buffer is enabled, a
680-ohm resistor acts as a pull-up increasing the intensity of the
GREEN...