First Prize

Telephone Message Watchdog
The low-cost Telephone Message Watchdog is a message-forwarding system for home telephones. Based on the H8S/2398 microcontroller, the software-only design uses a touch-tone detector and DTMF generator. The touch-tone detection system is triggered when the home answering machine picks up a phone call. A recorded message prompts callers to either leave a voice message or punch in a callback number, which is stored in on-chip memory. After the caller hangs up, the system uses the touch-tone generator to forward messages to a preset pager number. If the caller left a phone number, the system will send it to the pager. If not, the system will send the owner’s home number as an indication to call home to listen to the message.

Jingxi Zhang, Yang Zhang, and Huifang Ni
U.S.
zhang@jvclab.com

Abstract | Entry