KR950022566A - Automatic dialing and receiving device - Google Patents

Abstract

In addition to the function of ARS (Auto Response System), which is generally known as 700 service, this device adds dialing function and named ARDS. The biggest feature is that it can be easily installed and used on widely used IBM PC compatible models. The existing voice information service system provides a service when a user makes a phone call, but the system has a feature of not only receiving a call but also providing a service to the user by making a call. Existing circuit uses 851Hz Frame Sync signal by assigning 1 bit of 8051 microcontroller port, and uniformly sends out serial communication bit with tone detection and DS2132A tone generator. The circuit uses a low-cost 8255 PPI, separates parallel-to-serial, series-to-parallel conversion circuits, and generates 8KHz separately, thus saving effort in software production. The 8KHz Frame Sync signal is essential for tone generation and tone detection. The DS2249A is responsible for the interface with the telephone line. The voice signal is input from the outside and controlled by the 4066 analog switch and transmitted to the telephone line. When the other party presses the number, the DS2132A recognizes it and writes the value into port B of the 8255. When the value is read, the number is pressed.

Description

Automatic dialing and receiving device.

Since this is an open matter, no full text was included.

1 is the overall circuit diagram,

Second degree PC interface,

Third Clock Generater.

Claims (2)

DTMF Tone is generated by transmitting data through the IBM compatible PC (Figure 2), parallel to serial conversion (Figure 3) (Figure 4). . The part that converts serial to parallel (Figure 3) through DTMF Detect (Figure 6) through the Phone Line Interface (Figure 3), and then transfers it to the PC through the PC Interface (Figure 2). ※ Note: The disclosure is based on the initial application.