ApplePhone: Feedback When Using Hands Free Mode

I'm using the ApplePhone 1.0 application with my Quadra 840AV and GeoPort Telecom Adapter in hands free mode. I'm getting feedback from the speakers in the AudioVision 14-inch Display. How can I eliminate the feedback?

Notes: ApplePhone 1.0 and 1.0.1 is an example program that Apple does not support and it has been removed from Apple Software Updates. The Macintosh AV team created the program to show the capabilities of the AV technology. Apple does not intend to do any further work to this example program.

This ApplePhone software is NOT related in any way to the Apple Phone software that is a part of the Apple Telecom 3.x package. Apple Telecom 3.x also includes Apple Address Book and Apple Fax software.

The feedback is a result of a design deficiency in the ApplePhone application. Apple Phone does not have Echo Cancellation Code to prevent feedback. There are several workarounds you can use to eliminate the feedback.

1. If you are using the AudioVision 14-inch Display, set the volume controls to their midpoints. This will eliminate much of the feedback.

2. Connect the PlainTalk microphone to the microphone jack on the Macintosh or to the Monitor, if applicable. Position the microphone away from and behind the speakers to reduce the feedback.

3. Connect a pair of headphones to the sound out jack. This will eliminate all feedback.