Apparatus for cord-free hands-free telephony
View Patent ↗A telephone line interface includes a ring detect circuit for activating a RF transceiver and thereby notifying the RF headset of a ringing condition on a telephone line. A wire conversion circuit separates transmit voice signals from receive voice signals and provides the separated voice signals to the RF transceiver. A firmware allows the electronic hook switch to go off hook only when the line is ringing or only when the line is off hook.
1. A telephone line interface for directly connecting a RF headset with a central office telephone line having a tip and ring arrangement, said interface comprising:
a ring detect circuit that is directly coupled to said tip and ring arrangement and activates a RF transceiver once said ring detect circuit detects a ringing condition on said tip and ring arrangement, and thereby notifying said RF headset of said ringing condition on said central office telephone line;
a wire conversion circuit that separates transmit voice signals from receive voice signals and provides said separated voice signals to said RF transceiver;
an electronic hook switch that is coupled to said tip and ring arrangement, said electronic hook switch goes off hook responsive to a signal from said RF headset; and
a firmware module that receives a coded signal from said RF headset to activate said electronic hook switch to go off hook only when said central office telephone line is ringing or only when said central office telephone line is off hook, said firmware module also receives said receive voice signals and transmit voice signals and performs the digital processing necessary for communication with said RF headset.
2. The telephone line interface of claim 1 , wherein said headset is equipped with a multi function button.
3. The telephone line interface of claim 2 , wherein said button is operable to take said interface off hook when said CO line is ringing.
4. The telephone line interface of claim 2 , wherein said button is operable to terminate a call and return said interface on hook.
5. The telephone line interface of claim 2 , wherein said button is operable to turn said headset on or off.
6. The telephone line interface of claim 1 , wherein said RF transceiver and said RF headset communicate over a Bluetooth link.
7. The telephone line interface of claim 6 , wherein said multi function button is operable to perform Bluetooth pairing.
8. A telephone line interface for directly connecting a RF headset with a central office telephone line having a tip and ring arrangement, said interface comprising:
a Bluetooth transceiver;
a ring detect circuit that is directly coupled to said tip and ring arrangement and activates said transceiver once said ring detect circuit detects a ringing condition on said tip and ring arrangement, and thereby notifying said headset of a ringing condition on said central office telephone line;
an electronic hook switch that is coupled to said tip and ring arrangement, said electronic hook switch goes off-hook responsive to a signal from said RF headset;
a wire conversion circuit that separates transmit voice signals from receive voice signals and provides said separated voice signals to said transceiver;
a firmware module that receives a coded signal from said RF headset to allow said electronic hook switch to go off hook only when said central office telephone line is ringing or only when said central office telephone line is off hook, said firmware module also receives said receive voice signals and transmit voice signals and performs the digital processing necessary for communication with said RF headsets; and
an off hook detect circuit that is coupled to said tip and ring arrangement, said off hook detect circuit monitors said tip and ring arrangement and indicates to said firmware module whether the central office line is off hook.
9. The telephone line interface of claim 8 , wherein said headset is equipped with a multi function button.
10. The telephone line interface of claim 9 , wherein said button is operable to take said interface off hook when said line is ringing.
11. The telephone line interface of claim 9 , wherein said button is operable to terminate a call and return said interface on hook.
12. The telephone line interface of claim 9 , wherein said button is operable to turn said headset on or off.
13. The telephone line interface of claim 9 , wherein said multi function button is operable to perform Bluetooth pairing.