Patent application number | Description | Published |
20080281589 | Noise Suppression Device and Noise Suppression Method - There is disclosed a noise suppression device capable of improving the noise suppression accuracy while reducing the audio distortion. In this device, a suppression unit suppresses a noise component from the audio power spectrum by using the detection result of the audio-existing band and the noise band in the audio power spectrum including the noise component. A pitch harmonic structure extracting unit ( | 11-13-2008 |
20090061785 | SCALABLE DECODER AND SCALABLE DECODING METHOD - A scalable decoder capable of avoiding deterioration in subjective quality of a listener. The scalable decoder for decoding core layer encoding data and extension layer encoding data including an extension layer gain coefficient, wherein a voice analysis section detects variation in power of a core layer decoding voice signal being obtained from the core layer encoding data, a gain attenuation rate calculating section ( | 03-05-2009 |
20090070107 | SCALABLE ENCODING DEVICE AND SCALABLE ENCODING METHOD - Provided is a scalable encoding device capable of improving quality of a decoded signal without increasing an encoding amount and compensating data with a sufficient quality upon data loss. In the scalable encoding device, an extension layer bit distribution calculation unit ( | 03-12-2009 |
20090141790 | SCALABLE DECODER AND DISAPPEARED DATA INTERPOLATING METHOD - A scalable decoder capable of preventing degradation of the quality of the decoded signal in a disappeared data interpolation in band scalable coding. A core layer decoding section ( | 06-04-2009 |
20090326930 | SPEECH DECODING APPARATUS AND SPEECH ENCODING APPARATUS - Provided is an audio decoding device capable of suppressing an information amount for a lost frame compensation process and encoding efficiency. In this device, a decoded sound source generation unit ( | 12-31-2009 |
20100036656 | AUDIO SWITCHING DEVICE AND AUDIO SWITCHING METHOD - There is disclosed a speech switching device capable of improving quality of a decoded signal. In the device, a weighted addition unit ( | 02-11-2010 |
20100049509 | AUDIO ENCODING DEVICE AND AUDIO DECODING DEVICE - Disclosed are an audio encoding device and an audio decoding device which reduce degradation of subjective quality of a decoding signal caused by power mismatch of a decoding signal which is generated by a concealing process upon disappearance of a frame. When a frame is lost, a past encoding parameter is used to obtain a concealed LPC of the current frame and a concealed sound source parameter. A normal CELP decoding is performed from the obtained concealed sound source parameter. Correction is performed by using a conceal parameter on the obtained concealed LPC and the concealed sound source signal. The power of the corrected concealed sound source signal is adjusted to match a reference sound source power. A filter gain of the synthesis filter is adjusted so as to adjust the power of a decoded sound signal to the power of a decoded sound signal during an error-free state. Moreover, a synthesis filter gain adjusting coefficient is calculated by using an estimated normalized residual power so that a filter gain of a synthesis filter formed by using a concealed LPC is a filter gain during an error-free state. | 02-25-2010 |
20110064229 | AUDIO SIGNAL DECODING DEVICE AND BALANCE ADJUSTMENT METHOD FOR AUDIO SIGNAL DECODING DEVICE - Fluctuation in decoded signal localization is suppressed to maintain the feel of stereo. A selection unit ( | 03-17-2011 |
20110268280 | AUDIO SIGNAL DECODING DEVICE AND METHOD OF BALANCE ADJUSTMENT - Disclosed is an audio signal decoding device and a method of balance adjustment that reduces a fluctuation of a decoded signal orientation and maintains a stereo perception. An interchannel correlation computation unit ( | 11-03-2011 |
20130085752 | DECODER, ENCODER, AND METHODS THEREOF - Disclosed is a decoder capable of improving the sound quality of a decoded sound signal in an encoding method which combines speech encoding and music encoding in a hierarchical structure. A transform-encoding decoding unit ( | 04-04-2013 |
20130166308 | ENCODER APPARATUS AND ENCODING METHOD - Provided is an encoder apparatus that can suppress the quality degradation of encoding processes. An ultimate selection candidate limiting unit ( | 06-27-2013 |
20130339012 | SPEECH/AUDIO ENCODING APPARATUS, SPEECH/AUDIO DECODING APPARATUS, AND METHODS THEREOF - Provided is a speech/audio encoding apparatus with which it is possible to code a significant frequency domain region with high precision, and to enable high audio quality. A speech/audio encoding apparatus codes a linear prediction coefficient. A significant frequency domain region detection unit identifies a frequency domain region which is aurally significant from the linear prediction coefficient. A frequency domain region repositioning unit repositions the significant frequency domain region which is identified by the significant frequency domain region detection unit. A bit allocation computation unit determines a coding bit allocation on the basis of the significant frequency domain region which is repositioned by the frequency domain region repositioning unit. | 12-19-2013 |
20140200901 | ENCODING DEVICE, DECODING DEVICE, ENCODING METHOD AND DECODING METHOD - By copying to a high-frequency band portion (extension band) a low-frequency band portion in which peaking has been set to a sufficiently low state, this encoding device is capable of preventing generation of a spectrum with overly high peaking in the high-frequency band portion, and of generating a high-quality extension band spectrum. This device comprises: a maximum value search unit which searches, in each of multiple sub-bands obtained by dividing the low-frequency band portion of an audio signal and/or music signal below a prescribed frequency, for the maximum value of the amplitude of a first spectrum obtained by decoding first encoded data, which is encoded data in the low-frequency band portion; and an amplitude normalization unit which obtains a normalized spectrum by normalizing, at the maximum values of the amplitude of each sub-band, the first spectrum contained in each sub-band. | 07-17-2014 |
20140257825 | ENCODING APPARATUS AND ENCODING METHOD - Provided is an encoding apparatus. A threshold value calculating unit ( | 09-11-2014 |