33results about How to "Improve hearing quality" patented technology

An active grille shutter assembly includes a frame adapted to be connected to a portion of a vehicle and forming at least one opening therein and a plurality of shutters disposed in and extending across the at least one opening and being pivotally connected to the frame. The active grille shutter assembly also includes at least one linkage connected to the shutters and an actuator supported by the frame and being connected to one of the shutters to move the at least one linkage to open and close the shutters as a unit.

Provided in embodiments of the present invention are a prediction method and decoding device for a bandwidth expansion frequency band signal. The method comprises: demultiplexing a received bitstream to acquire a frequency domain signal; determining whether or not the highest frequency point having bits allocated of the frequency domain signal is less than a predetermined starting frequency of a bandwidth expansion frequency band; if yes, predicting an excitation signal of the bandwidth expansion frequency band on the basis of excitation signals in a predetermined frequency band range of the frequency domain signal and of the predetermined starting frequency point of the bandwidth expansion frequency band; otherwise, predicting the excitation signal of the bandwidth expansion frequency band on the basis of the excitation signals in the predetermined frequency band range of the frequency domain signal, of the predetermined starting frequency point of the bandwidth expansion frequency band, and of the highest frequency point having bits allocated; and, predicting a bandwidth expansion frequency band signal on the basis of the predicted excitation signal of the bandwidth expansion frequency band and of a frequency domain envelope of the bandwidth expansion frequency band. The technical solution of embodiments of the present invention is capable of effectively ensuring between preceding and subsequent frames the continuity of the excitation signals predicted for the bandwidth expansion frequency band signal, thus ensuring the auditory quality of a restored bandwidth expansion frequency band signal.

The invention relates to a method for eliminating indoor reverberations, and belongs to the technical field of signal processing. The method relates to a later period reverberation power spectrum estimation module, a spectrum subtraction module, a voice / voice-free detection module, an energy decrement module and a self-adaptation spectrum line enhancement module. Input of the later period reverberation power spectrum estimation module is the reverberation voice, output of the later period reverberation power spectrum estimation module is connected with the spectrum subtraction module, input of the spectrum subtraction module is the reverberation voice and the output of the later period reverberation power spectrum estimation module, output of the spectrum subtraction module is connected with the voice / voice-free detection module, output of the voice / voice-free detection module controls the output of the spectrum subtraction module, and the output of the voice / voice-free detection module controls the output of the spectrum subtraction module to be selectively connected with the energy decrement module or the self-adaptation spectrum line enhancement module. The energy decrement module or the self-adaptation spectrum line enhancement module outputs the final enhanced voice.

The invention discloses a bridge operation method for a digital telephone conference, which is characterized in that: a time delay and jitter processing mechanism is used to shape the code flow of multiple network segments; a VAD voice activation detection and a combination of single frame detection and long time window detection are adopted The sampling rate matching algorithm reduces the number of invalid channels entering the bridge operation and reduces the misjudgment rate of the operation; the short-term amplitude operation and funnel mixing operation are used to reduce the amount of calculation. The beneficial technical effects of the present invention are: 1) adapting to the large time delay jitter in the packet network environment, and providing code stream shaping of multiple network segments, providing continuous and uniform voice code streams for terminals, and improving the audio quality after decoding. 2) The VAD voice activation detection and sampling rate matching algorithm is adopted to reduce the number of invalid channels entering the bridge operation and reduce the misjudgment rate of the bridge operation. 3) The short-term amplitude calculation and funnel mixing method are adopted to greatly reduce the amount of calculation, avoid bridge misjudgment caused by impact interference, and improve the quality of bridge mixing.

The present invention discloses a digital audio camouflage and reconstruction method based on segmented sequences. The method comprises the steps of taking sub segment sequences obtained by dividing a published audio and a secret audio as a secret sequence and a published sequence, adding random perturbations to the sequences with the same element value, directly carrying out least squares matching on an equidistant transformation sequence obtained by the rotate right of the secret sequence and a corresponding position published sequence, finding a rotate right step length with a minimum residual error and a matched parameter, and thus camouflaging the secret audio as the published audio and further reconstructing the camouflaged audio as the secret audio. The method is easy to realize, since only the corresponding position equidistant transformation sequence matching is carried out, while the encoding time is reduced, the equidistant transformation number is raised, the matching precision is improved, the detail loss and overflow problems brought by the deformation from a smooth block to a complex block and the restoration from the smooth block to a complex texture block can be effectively avoided, and thus the auditory quality of camouflaged and reconstructed audios is improved further.