Telephone system having reduced sensitivity to RF interference and related methods
View Patent ↗A telephone to be connected to a wireline having reduced sensitivity to RF interference over a predetermined frequency range from an adjacent mobile wireless communications device may include a transmit amplifier, a receive amplifier, an audio input transducer connected to the transmit amplifier, and an audio output transducer connected to the receive amplifier. The telephone may further include an RF shield(s) surrounding the audio input transducer and the audio output transducer for reducing RF interference over the predetermined frequency range from the adjacent mobile wireless communications device. Moreover, the telephone may also include at least one RF audio input filter element connected to the audio input transducer and at least one RF audio output filter element connected to the audio output transducer, both of which are also for reducing RF interference over the predetermined frequency range from the adjacent mobile wireless communications device.
1. A telephone to be coupled to a wireline comprising:
a transmit circuit;
a receive circuit;
an audio input transducer coupled to said transmit circuit;
an audio output transducer coupled to said receive circuit;
at least one RF shield adjacent said audio output transducer and configured to reduce RF interference from an adjacent mobile wireless communications device; and
at least one RF audio output filter coupled to said audio output transducer and configured to reduce RF interference from the adjacent mobile wireless communications device.
2. The telephone of claim 1 wherein said at least one RF audio output filter comprises at least one ferrite bead.
3. The telephone of claim 1 wherein said at least one RF audio output filter comprises at least one capacitor.
4. The telephone of claim 1 wherein said at least one RF audio output filter comprises at least one ferrite bead, and at least one capacitor.
5. The telephone of claim 1 wherein said at least one RF shield and said at least one RF audio output filter are each operable over a frequency range of 30 MHz to 6 GHz.
6. The telephone of claim 1 further comprising a hybrid circuit to be coupled between said transmit and receive circuits and the wireline.
7. The telephone of claim 1 wherein said transmit circuit comprises an analog to digital converter (ADC); and wherein said receive circuit comprises a digital to analog converter (DAC).
8. The telephone of claim 7 wherein said at least one RF shield is also adjacent said DAC.
9. The telephone of claim 1 further comprising a housing carrying said transmit and receive circuits.
10. A telephone to be coupled to a wireline comprising:
a transmit circuit;
a receive circuit;
an audio input transducer coupled to said transmit circuit;
an audio output transducer coupled to said receive circuit;
at least one RF shield adjacent said audio input transducer and configured to reduce RF interference from an adjacent mobile wireless communications device; and
at least one RF audio input filter coupled to said audio input transducer and configured to reduce RF interference from the adjacent mobile wireless communications device.
11. The telephone of claim 10 wherein said at least one RF audio input filter comprises at least one ferrite bead.
12. The telephone of claim 10 wherein said at least one RF audio input filter comprises and at least one capacitor.
13. The telephone of claim 10 wherein said at least one RF audio input filter comprises at least one ferrite bead, and at least one capacitor.
14. The telephone of claim 10 wherein said at least one RF shield and said at least one RF audio input filter are each operable over a frequency range of 30 MHz to 6 GHz.
15. The telephone of claim 10 further comprising a hybrid circuit to be coupled between said transmit and receive circuits and the wireline.
16. The telephone of claim 10 wherein said transmit circuit comprises an analog to digital converter (ADC); and wherein said receive circuit comprises a digital to analog converter (DAC).
17. The telephone of claim 16 wherein said at least one RF shield is also adjacent said ADC.
18. The telephone of claim 10 further comprising a housing carrying said transmit and receive circuits.
19. A method for reducing sensitivity of a telephone to be coupled to a wireline to RF interference from an adjacent mobile wireless communications device, the telephone comprising a transmit circuit, a receive circuit, an audio input transducer coupled to the transmit circuit, and an audio output transducer coupled to the receive circuit, the method comprising:
positioning at least one RF shield adjacent the audio output transducer for reducing RF interference from the adjacent mobile wireless communications device; and
coupling at least one RF audio output filter to the audio output transducer for reducing RF interference from the adjacent mobile wireless communications device.
20. The method of claim 19 wherein the at least one RF audio output filter comprises at least one ferrite bead.
21. The method of claim 19 wherein the at least one RF audio output filter comprises at least one capacitor.
22. The method of claim 19 wherein the at least one RF shield and the at least one RF audio output filter are each operable over a frequency range of 30 MHz to 6 GHz.
23. The method of claim 19 wherein the receive circuit comprises a digital to analog converter (DAC); and wherein positioning the at least one RF shield comprises positioning the at least one RF shield to also be adjacent the DAC.
24. A method for reducing sensitivity of a telephone to be coupled to a wireline to RF interference from an adjacent mobile wireless communications device, the telephone comprising a transmit circuit, a receive circuit, an audio input transducer coupled to the transmit circuit, and an audio output transducer coupled to the receive circuit, the method comprising:
positioning at least one RF shield to be adjacent the audio input transducer for reducing RF interference from the adjacent mobile wireless communications device; and
coupling at least one RF audio input filter to the audio input transducer for reducing RF interference from the adjacent mobile wireless communications device.
25. The method of claim 24 wherein the at least one RF audio input filter comprises at least one ferrite bead.
26. The method of claim 24 wherein the at least one RF audio input filter comprises at least one capacitor.
27. The method of claim 24 wherein the at least one RF shield and the at least one RF audio input filter are each operable over a frequency range of 30 MHz to 6 GHz.
28. The method of claim 24 wherein the receive circuit comprises an analog to digital converter (ADC); and wherein positioning the at least one RF shield comprises positioning the at least one RF shield to also be adjacent the ADC.