N Tajima / K Tamm (@1.4) vs A Manekas / M Recci (@2.75)

Our Prediction:

N Tajima / K Tamm will win
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N Tajima / K Tamm – A Manekas / M Recci Match Prediction | 08-11-2019 09:00

These two forms of communication are both very powerful, but both suffer from limitations and lack of integration. The Telephone Text Messaging System (TTMS) we propose is a combination of the telephone and the modem. To increase communication effectiveness, the TTMS will allow persons to communicate via voice with a TTMS telephone and, without interrupting their communication, facilitate the communication with the ability to transmit small pieces of digital information.

To begin receiving an incoming message, press the receive button. When the end of message character is received, a "" will be displayed on the LCD representing the end of the message and the TTMS will be returned to its idle state. Once the TTMS begins receiving data, the incoming message will be stored in the incoming message memory in the RAM and will be displayed on the LCD.

See the Schematic titled DTMF to Phone Line Relay Circuit in Appendix 1 for more information. When the relay is disabled, there is no connection between the DTMF Generator and the phone line. When the DTMF Generator chip is connected directly to the phone line, it is as if the phone is always "off the hook." To fix this problem, we added a relay between the output of the DTMF Generator and the phone line. When the relay is enabled, the DTMF Generator is connected to the phone line and may transmit.

The atomic layer of the API consists of the atomic functions of the LCD, that is functions that the LCD controller already implements. These functions are clear, home, display on, cursor on, blink on, function set, entry set, write character, and goto address. With all of these functions implemented, I had a very stable set of functions to serve as my foundation for the extended layer.


Currently, we transmit approximately four characters a second. There are also potential database applications, enabling the TTMS to make simple queries in a database over the telephone and be returned requested data (i.e. There are also many potential applications for the TTMS that we would have liked to explore. If there had been more time, we would have liked to experiment with our communication protocol and further explore the timing limits of our circuit in an effort to produce faster communication times. phone book queries). Examples include automated text menu systems for applications to replace or enhance systems currently found on bank automated answering systems or even automated telephone movie listings. In short, we believe the TTMS is a valuable tool that could enhance the usefulness of the telephone in many ways.

Therefore, when the system looses power, it must be reprogrammed. The most serious drawback is the fact that the Xilinx 4010E FPGA we used is volatile. However, the TTMS that we have constructed is a basic implementation of a system with many potential uses. A second drawback is the fact that the FPGA must have the Xchecker cable connected even after successfully programmed. We do not know why this is necessary, and again, this drawback prevents this product from becoming commercially viable. This obviously would be very unpractical if the TTMS were to be commercially produced. The TTMS project was successfully completed on schedule implementing all major points outlined in the original proposal. During the course of the semester, we realized many positive traits of the usefulness of the TTMS as well as some drawbacks of our design.

The Holtek 9200 DTMF chip encodes a 4-bit binary input into the corresponding DTMF output tone (see Holtek 9200 data sheet). The CLK and DATA pins are not used in parallel mode; therefore, they are left unconnected. The S/P input on the DTMF Encoder is wired high to put the encoder in the parallel data mode. The 4 bit binary input is supplied at D3-D0 and the CE input is sent low thereby producing the corresponding output tone at pin 13.

Perhaps, as a future project, a group could develop an add-on component for the TTMS that would free the system from these limitations. The TTMS system that we constructed successfully implemented all of the functionality that we planned, demonstrating this system has many benefits and great potential. Obviously, a commercial product cannot have these limitations. Second, we discovered that the Xchecker cable must be connected to the circuit in order for the system to work. First, the Xilinx 4010E FPGA that we used was volatile, in that when we turn off the power, the chip must be reprogrammed. However, during the course of our project, we discover several significant drawbacks that prevent this system to be commercially viable. So in order to make the system work, we could never turn off the power and had to have the Xchecker cable connected at all times.

The data stored in the outgoing message memory of the RAM will be sent. The data being sent will be echoed on the LCD. To begin sending the outgoing message, press the send button. When the end of message character is reached, the end of message character "" will be displayed on the LCD and the TTMS will be returned to the idle state.

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On power-up, it initializes the LCD, prints the initialized message, and the prompt. The API at its core is a state machine. Then, it waits for the Control signals. The cycle will keep repeating until the power is turned off. When it receives the Control signals, it will jump to an appropriate state that will process the command. When it is done, it will return to the wait state and wait for the next Control signal.

The Tone wire from the phone line (the green wire) is input at the location labeled "Tone" on the above diagram. For the purposes of the TTMS, the OE pin on the DTMF Decoder is wired high, thus always enabling the output. The 4 bit binary output corresponding to this input tone can be found at D3-D0 following the assertion of the DV output. The Holtek 9170 DTMF chip decodes the tones produced by the telephone into a 4-bit binary output (see Holtek 9170 data sheet).