Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
Sederholm, CH: AUTHOR [+1]
The combination of a microprocessor intelligence and a standard push-button telephone along with a cathode ray tube (CRT) display provides capabilities which as of yet have not been available with a standard telephone.
The combination of a microprocessor intelligence and a standard push- button telephone along with a cathode ray tube (CRT) display provides capabilities which as of yet have not been available with a standard telephone.
Fig. 1 shows functional elements of an intelligent telephone. This includes a CRT screen 1, a conventional telephone handset 2 consisting of a microphone and speaker, a keyboard 3 with function buttons, a quick reference label 4, and diagnostic and system controls 5 consisting of display intensity, horizontal and vertical hold as well as diagnostic switches for diagnosing proper unit operation.
The logical elements of the device, as shown in Fig. 2, consist of a general- purpose program-controlled microprocessor 6 with program and data storage elements (read-only storage/random-access memory) 7. Operations are initiated from the keyboard 3, the ON/OFF hook controls 8 or the telephone line 9. Microprocessor 6 interrogates the keyboard 3 through the keyboard interface 10. If an operation request is sensed, microprocessor 6 is capable of controlling display 1 through the display interface 11 as well as the tone generators 12, which, after being passed through the analog filter 13, generate the dialing tones necessary to establish a telephone connection over the telephone line 9. The timer 14 is utilized for keeping the time of day as well as generating the time durations for various controlling functions.
A telephone call is initiated by a user lifting the handset 2 and the off-hook
status is sensed by microprocessor 6. If the initiated call is placed through the
keyboard 3 as contrasted from data storage 7, microprocessor 6 interrogates the
keyboard 3 through the keyboard interface 10. Microprocessor 6 then controls
the tone generators 12 based on the information received from keyboard 3. The
signal from the tone generators 12 are combined and filtered through the analog
filter 13 and passed on to the telephone line 9 through the ON/OFF hook circuitry
8. This signal is then pulsed for the proper time duration with the aid of the timer 14 and contains the information necessary to establish a call through the normal public telephone network.
Appropriate status information relating to the call is displayed on the display 1 through the display interface 11. Conversely, a call that is answered automatically by this system can extract digital information by interrogating the tone detectors 15. By utilizing a pair of tones which are compatible with the standard public telephone system, many functions can be performed under stored program means.
In addition to the system shown in Fig. 2, an optional printing unit and tape recorder/player unit, each...