|
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese|
ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING AON-prefix to the computer Electronic secretary. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Telephony Every year, computer technology is becoming more and more integral to our lives. The number of personal computer users is constantly increasing. In this regard, the question arose: is it possible to expand the functions of caller ID at the expense of the capabilities of a computer related to the processing and display of information? For example, to simultaneously display the complete data about the caller on the monitor screen along with the call? Some types of modems, for example, ZyXEL modems, are equipped with caller ID functions. However, at their price, they clearly do not match the capabilities of ordinary users. They may be interested in a special hardware-software complex developed by Telesystems called "Electronic Secretary". It consists of a set-top box, housed in a small case with a 25-pin connector, and a program. The same program can control the Gamma phone. It will be described in detail in one of the "Radio" issues. The set-top box is connected to the serial port of the computer and to the telephone line. Its distinctive features are autonomy and the ability to accumulate call data even when the computer is turned off. However, while the computer is running, the capabilities of the "Electronic Secretary" complex are significantly expanded: it becomes possible to work with large databases of subscribers, as well as record and play back voice messages in the mode of an answering machine and an automatic informer. The set-top box is powered by a telephone line and does not require power from a 220 V network. Its appearance is shown in fig. 1.
In offline mode (when the computer is off) "Electronic Secretary" performs the main functions of caller ID: records incoming calls in the database with parameters including the subscriber's phone number, date, time and duration of the call; registers outgoing calls from parallel telephones in a database with parameters including dialed number, date, time and call duration. At the same time, the quality of identifying the caller's number, which is significantly increased compared to conventional callers, is ensured by the use of a microcontroller with built-in ADC and DAC. They also allow the implementation of digital answering machine functions. Since the storage of digitized audio information requires a large amount of memory, this function is implemented only with the help of a computer. Voice messages are recorded and listened to either with the help of a parallel telephone connected to the line, or with the use of computer multimedia facilities. One of the options for using the "Electronic Secretary" is its use in special dispatch and emergency services (police, ambulance, fire departments, etc.). In this case, you can quickly extract additional information from the call and document incoming messages. "Electronic Secretary" allows you to get real-time information from the database about the caller, which will significantly reduce operator errors. For example, a misunderstood or erroneously recorded address when calling a doctor can cost a person their life. In addition, you can analyze various statistical information: the distribution of the number of calls by time of day, day of the week, etc. Of course, the prefix is very useful as an assistant to a business person.
The program for managing the work of the "Electronic Secretary" is supplied with the attachment. It is designed for use in the Windows-95 system environment, while background execution is provided, that is, the user works in parallel with other programs. In accordance with the capabilities of modern computers, the program also allows you to maintain very large databases of subscribers and calls, provides convenient access to information. The program registers incoming calls with a search in the database for last name, first name, address and other information about the subscriber (databases up to 30 million subscribers are supported), records outgoing calls in the database with indication of the telephone line and phone number of the subscriber, date, time, call duration . Registering a telephone line number is necessary when serving multiple telephone lines with the appropriate number of set-top boxes. There is a personal telephone directory with a built-in scheduler of telephone conversations and auxiliary databases: a directory of long-distance and international codes, a city navigator, etc. It is possible to automatically dial a busy subscriber or a group of subscribers according to a predetermined schedule, search in databases according to specified criteria, or criteria group, data exchange with the phone memory, programming its settings. In addition, the program includes a business organizer with a business event planner. The electrical circuit of the attachment is shown in fig. 2. The basis of the device is a microprocessor controller PIC16C73 from Microchip Technology, Inc. (chip DD1) with built-in DAC and ADC. Non-volatile FLASH memory 24LC16B with 12C interface and 2Kx8 organization (DD2 chip) is used for data storage. Diode bridge VD1-VD4 allows you to connect the device regardless of the polarity of the telephone line. Stabilization of the supply voltage is carried out by a lithium cell G1. The frequency of the internal clock generator of the controller is stabilized by a ZQ1 quartz resonator at a frequency of 4,25 MHz. The time synchronization of the controller is carried out by a quartz oscillator at a frequency of 32 Hz. The signal from the line passes through the HPF on the elements C5, C6, R7, R8, is amplified by the transistor VT1 and is fed to the controller input (signal SIG). The voltage divider across resistors R2 and R3 forms a line voltage sensor. The node on the key K1 and the resistor R4, controlled by the UP signal, forms a line seizure emulator, combined with the dialing node. The voice signal is transmitted to the line using the K2 key, controlled by the PWML signal Communication with the computer's serial port occurs via the RSIN and RSO circuits. Galvanic isolation of the set-top box with the computer port is provided by optocouplers U1 and U2. The signal from the output of the optocoupler U1, which is fed to the input RX of the serial port, is amplified by the current by the emitter follower on transistors VT2 and VT3. Author: I.Korshun, Zelenograd
Artificial leather for touch emulation
15.04.2024 Petgugu Global cat litter
15.04.2024 The attractiveness of caring men
14.04.2024
▪ Gamers make decisions faster and more accurately ▪ Xiaomi Mi PTZ Camera for hoverboard ▪ Probiotic capable of destroying antibiotic-resistant bacteria
▪ section of the site Reference materials. Article selection ▪ Article One thousand and one nights. Popular expression ▪ How is heat and cold formed? Detailed answer ▪ article Potentilla goose. Legends, cultivation, methods of application ▪ article Ink for labeling linen. Simple recipes and tips
Home page | Library | Articles | Website map | Site Reviews
www.diagram.com.ua |
See other articles Section 
Latest news of science and technology, new electronics:
All languages of this page