Method and apparatus for improving the quality of speech signals
First Claim
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1. A network device comprising:
- an input interface;
a generation unit configured to generate a bandwidth extended signal derived from a far-end speech communication signal received at the input interface;
a controller configured to control power of the bandwidth extended signal relative to power of the far-end speech communication signal; and
an output interface to which the bandwidth extended signal is provided.
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Abstract
An embodiment of the present invention is a method and apparatus for extending bandwidth of a speech communication beyond a band-limited region to which the speech communication may be otherwise constrained. Such embodiments may be used to provide higher fidelity speech to the listener for an enhanced user experience.
17 Citations
55 Claims
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1. A network device comprising:
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an input interface; a generation unit configured to generate a bandwidth extended signal derived from a far-end speech communication signal received at the input interface; a controller configured to control power of the bandwidth extended signal relative to power of the far-end speech communication signal; and an output interface to which the bandwidth extended signal is provided. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A network device based method for bandwidth extension, the method comprising:
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receiving a signal including a far-end speech communication; generating a bandwidth extended signal derived from the received speech communication signal; controlling power of the bandwidth extended signal relative to power of the far-end speech communication signal; and providing the bandwidth extended signal to an output of the network device. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A network device based method, the method comprising:
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receiving an input signal; generating an output signal, the output signal representing a wider bandwidth version of a speech communication represented by the input signal; controlling power of the bandwidth extended signal relative to power of the far-end speech communication signal; and providing the output signal to an output of the network device. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. A network device based method, the method comprising:
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receiving an input signal at an input interface of the network device; decoding the input signal; determining an interval in the input signal when speech is not present in the input signal; generating a derivative signal having at least one component at a frequency that is outside a bandwidth of the input signal, the at least one component being derived from the decoded input signal; determining a gain for the derivative signal to generate a gain-determined derivative signal, a lower level of gain being determined for the derivative signal during the interval as compared to a level of gain applied to the derivative signal prior to the interval; delaying the decoded input signal to generate a delayed input signal; combining the gain-determined derivative signal with the delayed input signal to generate an output signal, the output signal representing a wider bandwidth version of a speech communication represented by the input signal; encoding the output signal; and providing the encoded output signal to an output interface of the network device.
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Specification