METHOD AND SYSTEM FOR POWER DELIVERY TO A HEADSET
First Claim
Patent Images
1. A method of providing power to a headset, the method comprising:
- processing an audio signal having a time-varying amplitude;
generating a power signal by amplitude modulating a carrier signal with a modulation signal that is formed in a complementary fashion to the time-varying amplitude of the audio signal; and
summing the power signal with the audio signal to form a composite signal having an amplitude limited to a maximum amplitude value.
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Abstract
A power delivery method and system for powering a headset. A power signal is combined with an audio signal to form a composite signal that is communicated over a shared channel to the headset. The power signal is generated by modulating a carrier signal with a modulation signal. The modulation signal is derived from the amplitude of the audio signal so that the peak levels of the composite signal do not exceed the maximum allowable output of an audio I/O circuit driving the headset.
443 Citations
31 Claims
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1. A method of providing power to a headset, the method comprising:
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processing an audio signal having a time-varying amplitude; generating a power signal by amplitude modulating a carrier signal with a modulation signal that is formed in a complementary fashion to the time-varying amplitude of the audio signal; and summing the power signal with the audio signal to form a composite signal having an amplitude limited to a maximum amplitude value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for providing power to a headset from a terminal device coupled to the headset device with a cable, the system comprising:
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an audio signal source configured to provide an audio signal having a time-varying amplitude; a power signal source configured to provide a power signal by amplitude modulating a carrier signal with a modulation signal that is formed in a complementary fashion to the time-varying amplitude of the audio signal; and a summing circuit operatively coupled to the audio signal source and the power signal source and configured to output a composite signal having an amplitude limited to a maximum amplitude value. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A communication system comprising:
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a terminal device; and a headset device coupled to the terminal device with a cable; the terminal device including; an audio signal source configured to provide an audio signal having a time-varying amplitude; a power signal source configured to provide a power signal by amplitude modulating a carrier signal with a modulation signal that is formed in a complementary fashion to the time-varying amplitude of the audio signal; and a summing circuit operatively coupled to the audio signal source and the power signal source, the summing circuit configured to output a composite signal having an amplitude limited to a maximum amplitude value; the terminal device being configured to provide the composite signal to the headset for playing the audio signal and powering the headset with the power signal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 29, 30, 31)
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Specification