Speech Adapter Audio Test Circuit
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2005-Mar-22
Publishing Venue
IBM
Related People
Allen, JW: AUTHOR [+2]
Abstract
This article describes a Speech Adapter audio input test circuit.
Speech Adapter Audio Test Circuit
This article
describes a Speech Adapter audio input test
circuit.
During normal
operation a microphone is the standard audio
input device attached to the adapter audio input circuitry and is
used to record speech. At various times
the adapter will require
testing when a microphone may not be available.
The Test
Circuit provides a unique way to test the audio input
circuitry and speech record function without the necessity of
attaching an external microphone. The
Test Circuit is automatically
connected to the audio input when the microphone is disconnected.
This feature will be used in four situations.
1. During Manufacturing Test when
running diagnostics.
2. When the customer runs diagnostics to
identify the cause of
functional failures.
3. When the dealer runs diagnostics on
returned Speech Adapters to
verify failure.
4. When the IBM Parts Center runs
diagnostics to verify failures.
Thus, the
Speech Adapter can be tested in most situations
without the necessity of having a microphone available.
CIRCUIT FEATURES
1. The test signal source is a
Programmable Interval Timer. (This
device is normally used by the Adapter to generate clock signals.)
Thus, the test signal can be turned on or off and the frequency
changed through program control, by the Personal Computer.
2. The Test Circuit and microphone are
attached to the audio input
at the same point. Thus, the Test
Circuit lists all...