US 5,907,605 AGranted

Dual format caller ID for both FSK and DTMF caller ID formats

AssigneeServicios Condumex S.A. de C.V.

InventorsIsmael Ortiz Ramirez, Jaime Antonio Uribe Uribe, Mariano Centeno Camarena

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Abstract

The dual equipment for identification of telephone calls is a terminal electronic device that meets the telephone specifications for the service of Caller Identification. It is an intelligent electronic equipment that is connected to the telephone line of a called user that, upon receiving a call phone, presents through a liquid crystal display the caller's telephone number information. The equipment can also store in the memory the telephone call identification when the subscriber is not in his place of business, and thus when the user returns he can check who called, or from which telephone number, as well as the date and time. It consists of a battery eliminator entry for its power supply and a support battery, it identifies the information sent to it by the network through the input signalization that can be of DMF (Dual Tone Multifrequency) type or FSK (Frequency Shift Keying) type.

Claims21

Dependent claims

A caller identificator system that allows the called party to see at least the telephone number of the caller before answering the telephone for use in both FSK and DTMF telephone central caller-ID formats for receiving and decoding signals transmitted to telephone subscriber lines, said lines each having a first line and a second line, said system comprising:

a microcontroller unit/MCU for processing data and providing output signals, a non-volatile memory coupled to said microcontroller for storing data and programs;
said MCU having a format selector to determine whether FSK format or DTMF format caller-ID format signals are about to be transmitted;
an FSK demodulator for demodulating said FSK format caller-ID signals transmitted through said first line and said second line, said format selector connecting said FSK demodulator and providing an FSK activation signal, said format selector determining FSK caller-ID format and providing said FSK activation signal includes a call start current detector and duration measurer and if both within predetermined values chooses FSK caller-ID format and provides said FSK activation signal to said FSK demodulator;
said microcontroller coupled to said FSK demodulator through a first FSK activation line upon which said FSK activation signal is transmitted;
a first data connection between said FSK demodulator and said microcontroller for providing data from said FSK demodulator into said microcontroller;
a DTMF receiver for decoding tones from either a microtelephone or said first and second lines, said microcontroller coupled to said DTMF receiver through a second activation line, said activation line providing a communication path for a DTMF activation signal, said format selector determining DTMF caller-ID format and providing said DTMF activation signal, include said selector including a polarity detection circuit coupled to said microcontroller for detecting a change in polarity and providing a polarity change signal to said microcontroller, said polarity change signal being a DTMF activation signal;
an off hook detector for determining the state of said microtelephone and providing an off hook signal to said microcontroller;
a second data connection is provided between said DTMF receiver and said microcontroller for providing data from said DTMF receiver into said microcontroller;
and
a keyboard for providing input to said microcontroller;
said keyboard having at least one connector line to said microcontroller,
an LCD display;
an LCD driver circuit;
said display being interconnected to said driver circuit;
said LCD driver circuit being connected to said microcontroller;
and wherein said display shows caller-ID information of at least the telephone number of the caller to the caller party for telephone central offices which use either the FSK or DTMF caller-ID formats.

13 more elements

A method of operating a dual caller ID format/FSK-DTMF caller-ID call identificator system controlled with a microcontroller for receiving and decoding signals transmitted through telephone lines, comprising:

processing data and providing output signals with a microcontroller, storing data and programs in a non-volatile memory from said microcontroller,
detecting ring condition and providing a first signal on a call current line to said microcontroller, setting an FSK demodulator out of an idle mode when said first signal provides said microcontroller with a value indicating a valid ring through a first activation line, demodulating information provided on a first and second line with said FSK demodulator, communicate data from said FSK demodulator to said microcontroller through a first data connection;
storing said data from said FSK demodulator in said non-volatile memory through said microcontroller using clock and data lines;
detecting the polarity change in signal on said first and second lines, detecting an off hook condition on said first and second lines, sending second activation signal to a DTMF receiver to receive tones from either a microtelephone or said first and second lines based on conditions detected in said polarity change and off hook condition with said microcontroller, informing said microcontroller through a valid tone line when said DTMF receiver receives valid frequency and duration of tones, said microcontroller enabling said DTMF receiver through an enable line when valid frequency and duration of tones is detected;
sending DTMF format caller-ID data from said DTMF receiver into said microcontroller through a second data connection line to said microcontroller when said enable line is enabled;
storing said data from said DTMF receiver in said non-volatile memory through said microcontroller;
activating an LCD display interconnected to an LCD driver circuit through a third activation line connected between said microcontroller and said LCD driver, sending data representing information obtained from said first and second lines to said LCD from said microcontroller.

4 more elements

Dependencies are inferred from the claim text.