CONEXANT D1110 DRIVERS FOR PC
CONEXANT D1110 DRIVER DETAILS:
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CONEXANT D1110 DRIVER
For example, narrowband conexant d1110 A may be configured to shift only those frames or subframes having a long-term structure, such as voiced signals. It may even be desirable to perform regularization only on subframes that include pitch pulse energy.
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- US8140324B2 - Systems, methods, and apparatus for gain coding - Google Patents
Unfortunately, regularization may cause problems for a wideband speech coder in which the highband excitation is derived from the encoded narrowband excitation signal such as a system including wideband speech encoder A and wideband speech decoder B Due to its derivation from a time-warped signal, the highband excitation signal will generally have a time profile that is different from that of the original highband speech signal. Conexant d1110 other words, the highband excitation signal will no longer be synchronous with the original highband speech signal.
A misalignment in time between the warped highband excitation signal and the original highband speech signal may cause several problems.
For example, the warped highband excitation signal may no longer conexant d1110 a suitable source excitation for a synthesis filter that is configured according to the filter parameters extracted from the original highband speech signal. As a result, the synthesized highband signal conexant d1110 contain audible artifacts that reduce the perceived quality of the decoded wideband speech signal.
The misalignment in time may also conexant d1110 inefficiencies in gain envelope encoding. As mentioned above, a correlation is likely to exist between the temporal envelopes of narrowband excitation signal S 80 and highband signal S By encoding the gain envelope of the highband signal according to a relation between these two temporal envelopes, an increase in coding efficiency may be realized as compared to encoding the conexant d1110 envelope directly.
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When the encoded narrowband excitation signal is regularized, however, this correlation may be weakened. The misalignment in time between narrowband excitation signal S 80 and highband signal S 30 may cause fluctuations to appear in highband gain factors S 60 band coding efficiency conexant d1110 drop.
Embodiments include methods of wideband speech encoding that perform time warping of a highband speech signal according to a time warping included in a corresponding encoded narrowband excitation signal. Encoder AD 10 conexant d1110 an implementation A of narrowband encoder A that is configured to perform regularization during calculation of the encoded narrowband excitation signal S For example, narrowband encoder A may be configured according to one or more of the RCELP implementations discussed above.
US8140324B2 - Systems, methods, and apparatus for gain coding - Google Patents
Narrowband encoder A is also configured to output a regularization data signal SD 10 that specifies the degree of time warping applied. For various cases in which narrowband encoder A is configured to apply a fixed time shift to each frame or subframe, regularization data signal SD 10 may include a series of values indicating each time shift amount as an integer or non-integer value conexant d1110 terms of samples, milliseconds, or some other time increment.
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For a case in which narrowband encoder A is configured to otherwise modify the time scale of a frame or other sequence of samples e. In one particular example, narrowband encoder A is configured to divide a frame conexant d1110 three subframes and to calculate a fixed time shift for each subframe, such that regularization data signal SD 10 indicates three time shift amounts conexant d1110 each regularized frame of the encoded narrowband signal.
Wideband speech encoder AD 10 includes a delay line D configured to advance or retard portions of highband speech signal S 30according to delay amounts indicated by an input signal, to produce time-warped highband speech signal S 30 a. In the example shown in FIG. In conexant d1110 manner, the same amount of time warping that was included in encoded narrowband excitation signal S 50 is also applied to the corresponding portion of highband speech signal S 30 before analysis.
Although this example shows delay line D as a separate element from highband encoder Ain other implementations delay line D is arranged as part of the highband encoder. Further implementations of highband encoder A may be configured to perform spectral analysis e. Such an encoder may include, for example, an implementation of delay line D arranged to perform the time warping. In such cases, however, highband filter parameters S 60 a based on the analysis of unwarped signal S 30 may describe a spectral envelope that is misaligned in time with highband conexant d1110 signal S Delay line D may be configured according to any combination of logic elements and storage elements suitable for applying the desired time warping operations to highband speech signal S For example, delay line D may be configured to read highband speech signal S 30 from a buffer according to the desired time shifts.
Shift register SR 1 is a buffer of some length m that is configured to receive and store the m most recent samples of highband speech signal S It may be convenient for the value m to be equal to the length of a frame or subframe of highband signal Conexant d1110 CONEXANT D DRIVER - Follow the on-screen installation instructions.
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