AC/DC phone line detector

1. An alternating current and direct current (AC/DC) telephone line detection system, the AC/DC telephone line detection system comprising:

an electronic circuit that is floating with reference to ground;

a first analog-to-digital (A/D) converter coupled to the electronic circuit and configured to detect ringing voltages from DC voltages included in a telephone line;

a second A/D converter coupled to the electronic circuit and configured to detect caller identification information from AC voltages included in the telephone line; and

a processor configured to control signals detected by the first and second A/D convertors and output information about the signals to call taking equipment.

2. The AC/DC telephone line detection system of claim 1 , further comprising a power source coupled to the electronic circuit and configured to provide an isolation of 1500 volts minimum.

3. The AC/DC telephone line detection system of claim 2 , wherein the power source is configured to provide an isolation of 1500 volts between the telephone line and the call taking equipment.

4. The AC/DC telephone line detection system of claim 1 , wherein the first A/D converter is configured to detect high voltage signals from the DC voltages, the second A/D converter is configured to detect low voltage signals from the AC voltages, and the high voltage signals have higher voltages than the low voltage signals.

5. The AC/DC telephone line detection system of claim 1 , wherein the electronic circuit is included in a microcontroller that includes a central processing unit, a memory, and a plurality of input/output ports which are embedded on the electronic circuit.

6. The AC/DC telephone line detection system of claim 1 , wherein the first A/D converter is further configured to detect a polarity of a voltage indicating a state of the telephone line and DC signaling from a central office (CO).

7. The AC/DC telephone line detection system of claim 1 , wherein the second A/D converter is further configured to detect audio transmitted during a phone call and on-hook transmissions transmitted between calls.

8. The AC/DC telephone line detection system of claim 1 , wherein the processor is further configured to output the detected caller ID information to a display device of the call taking equipment.

9. A telephone system comprising:

call taking equipment comprising a display; and

a microcontroller configured to detect caller identification (ID) information from a telephone line being input to the telephone system and output the detected caller ID information to the display, wherein the microcontroller comprises:

an electronic circuit that is floating with reference to ground;

a first analog-to-digital (A/D) converter coupled to the electronic circuit and configured to detect ringing voltages from DC voltages included in a telephone line;

a second A/D converter coupled to the electronic circuit and configured to detect caller identification information from AC voltages included in the telephone line; and

a processor configured to control signals detected by the first and second A/D convertors and output information about the signals to the call taking equipment.

10. The telephone system of claim 9 , wherein the telephone system is included within a public-safety access point (PSAP) for receiving emergency phone calls.

11. The telephone system of claim 9 , wherein the microcontroller further comprises a power source coupled to the electronic circuit and configured to provide an isolation of 1500 volts minimum.

12. The telephone system of claim 11 , wherein the power source is configured to provide an isolation of 1500 volts between the telephone line and the call taking equipment.

13. The telephone system of claim 9 , wherein the first A/D converter is configured to detect high voltage signals from the DC voltages, the second A/D converter is configured to detect low voltage signals from the AC voltages, and the high voltage signals have higher voltages than the low voltage signals.

14. The telephone system of claim 9 , wherein the electronic circuit comprises a central processing unit, a memory, and a plurality of input/output ports.

15. The telephone system of claim 9 , wherein the first A/D converter is further configured to detect a polarity of a voltage indicating a state of the telephone line and DC signaling from a central office (CO).

16. The telephone system of claim 9 , wherein the second A/D converter is further configured to detect audio transmitted during a phone call and on-hook transmissions transmitted between calls.

17. A method comprising:

receiving a telephone signal via a telephone line between call taking equipment and a central office, the telephone signal comprising alternating current (AC) and direct current (DC) voltages;

detecting, via a first analog-to-digital (A/D) converter, ringing voltages from DC voltages included in the telephone signal;

detecting, via a second A/D converter, caller identification information from AC voltages included in the telephone signal; and

controlling, via a processor, signals detected by the first and second A/D convertors and outputting information about the signals to the call taking equipment,

wherein the first A/D converter, the second A/D converter, and the processor, are electronically connected to each other and coupled to an electronic circuit that is floating with reference to ground.

18. The method of claim 17 , wherein the method further comprises providing an isolation of 1500 volts minimum between the telephone line and the call taking equipment.

19. The method of claim 17 , further comprising detecting, via the first A/D converter, a polarity of a voltage from the telephone line indicating a state of the telephone line and DC signaling from the central office.

20. The method of claim 17 , further comprising detecting, via the second A/D converter, audio transmitted during a phone call, and outputting the detected audio to the call taking equipment.