Voice interference correction for mixed voice and spread spectrum data signaling
First Claim
1. A method for reducing bit stream errors in an audio system, wherein a bit stream modulates a chip sequence and an audio carrier signal to form a modulated signal, wherein the modulated signal is embedded in an audio signal, the method comprising:
- calculating an interference among the audio signal, the chip sequence and the audio carrier signal;
subtracting the interference from the bit stream prior to modulating the chip sequence and the audio carrier signal; and
summing the audio signal and the modulated signal.
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Accused Products
Abstract
A method, a process and an audio system for embedding bit stream in a voice signal is disclosed. A voice/data interference signal is composed and supplied to the mixer of the voice signal and the data signal such that the resulting mixed signal effectively cancels the interference and allows the interference-free signal being transmitted to the audio signal receiver/decoder. The decoder may decode the data without interference errors. A method using profile shaping to mask the noise due to modulated carrier signal is also disclosed.
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Citations
23 Claims
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1. A method for reducing bit stream errors in an audio system, wherein a bit stream modulates a chip sequence and an audio carrier signal to form a modulated signal, wherein the modulated signal is embedded in an audio signal, the method comprising:
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calculating an interference among the audio signal, the chip sequence and the audio carrier signal; subtracting the interference from the bit stream prior to modulating the chip sequence and the audio carrier signal; and summing the audio signal and the modulated signal.
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2. A method for embedding a bit stream in an audio stream in an audio system, the method comprising:
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calculating an interference between the audio stream and a combination of an audio carrier signal and a chip sequence; forming a modulated signal to represent the bit stream by subtracting the interference from the bit stream prior to using the bit stream to modulate the combination of the audio carrier signal and the chip sequence; and summing the audio stream and the modulated signal to form a mixed signal. - View Dependent Claims (3, 4, 5, 6, 7)
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8. A signal processor for an audio system, the processor comprising:
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a processing module operable for, calculating an interference between an audio signal, a chip sequence, and an audio carrier signal; subtracting the interference from a bit stream prior to using the bit stream to modulate the chip sequence and the audio carrier signal to form a modulated signal to represent the bit stream, wherein the modulated signal is embedded in the audio signal; and summing the audio signal and the modulated signal to form a mixed signal. - View Dependent Claims (9, 10, 11, 12, 13)
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14. An audio system, comprising:
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a microphone; and a processing module coupled to the microphone, wherein the processing module is operable for; receiving a bit stream; calculating an interference between an audio signal, a chip sequence, and an audio carrier signal; subtracting the interference from the bit stream prior to using the bit stream to modulate the chip sequence and the audio carrier signal to form a modulated signal to represent the bit stream, wherein the modulated signal is embedded in the audio signal; and summing the audio signal and the modulated signal to form a mixed signal. - View Dependent Claims (15, 16, 17, 18, 19)
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20. The audio system of 14, further comprising:
a network interface coupled the process module.
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21. The audio system of 20,
wherein the network interface is operable to connect to a Plain Old Telephone Service (POTS) network.
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22. The audio system of 20,
wherein the network interface is operable to connect to a radio that broadcasts the mix signal.
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23. The audio system of 20,
wherein the network interface is operable to record the mixed signal in a medium.
Specification