| Patent application number | Description | Published |
|---|
| 20080249766 | Scalable Decoder And Expanded Layer Disappearance Hiding Method - A scalable decoder which does not frequently switch the band of the decoded signal even if the signal in an expanded layer in band scalable encoding disappear and does not give any strangeness or discomfort to the subjective quality. If frame disappearance does not occur, the signal is a signal (S | 10-09-2008 |
| 20080255833 | Scalable Encoding Device, Scalable Decoding Device, and Method Thereof - A scalable encoding device for realizing scalable encoding by CELP encoding of a stereo sound signal and improving the encoding efficiency. In this device, an adder and a multiplier obtain an average of a first channel signal CH | 10-16-2008 |
| 20080275698 | EXCITATION VECTOR GENERATOR, SPEECH CODER AND SPEECH DECODER - A speech encoder includes an adaptive codebook that generates an adaptive codevector representing a pitch component, a random codebook that generates a random codevector representing a random component, and a synthesis filter that generates a synthetic speech signal by being excited by the adaptive codevector and the random codevector. The random codebook includes an input vector provider configured to provide an input vector, and an excitation vector generator configured to generate an excitation vector as the random codevector by dispersing the input vector by using a fixed pattern. A length of the fixed pattern is shorter than a length of a sub-frame. | 11-06-2008 |
| 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 |
| 20090119111 | STEREO ENCODING DEVICE, AND STEREO SIGNAL PREDICTING METHOD - A prediction performance between the individual channels of a stereo signal is improved to improve the sound quality of a decoded signal. An LPF ( | 05-07-2009 |
| 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 |
| 20090248404 | LOST FRAME COMPENSATING METHOD, AUDIO ENCODING APPARATUS AND AUDIO DECODING APPARATUS - A frame loss compensating method wherein even when audio codec, which utilizes past sound source information of adaptive codebook or the like, is used as a main layer, the degradation in quality of the decoded audio of a lost frame and following frames is small. In this method, it is assumed that a pitch period ‘T’ and a pitch gain ‘g’ have been obtained as encoded information of a current frame. The sound source information of a preceding frame is expressed by use of a single pulse, and a pulse position ‘b’ and a pulse amplitude ‘a’ are used as encoded information for compensation. Then, an encoded sound source signal is a vector that builds up a pulse having an amplitude ‘a’ at a position that precedes by ‘b’ from the front position of the current frame. This vector is used as the content of the adaptive codebook, so that a vector, which builds up a pulse having an amplitude (g×a) at the position of the current frame (T−b), can be used as an adaptive codebook vector at the current frame. This vector is used to synthesize a decoded signal. The pulse position ‘b’ and pulse amplitude ‘a’ are then decided such that a difference between the synthesized signal and an input signal becomes minimum. | 10-01-2009 |
| 20090265167 | SPEECH ENCODING APPARATUS AND SPEECH ENCODING METHOD - Disclosed is an audio encoding device capable of adjusting a spectrum inclination of a quantized noise without changing the Formant weight. The device includes: an HPF ( | 10-22-2009 |
| 20090281795 | SPEECH ENCODING APPARATUS, SPEECH DECODING APPARATUS, SPEECH ENCODING METHOD, AND SPEECH DECODING METHOD - There is provided an audio encoding device for correcting the component having insufficient encoding capability in the core layer by an extended layer. In this device, a core layer encoding unit ( | 11-12-2009 |
| 20090292534 | FIXED CODE BOOK SEARCH DEVICE AND FIXED CODE BOOK SEARCH METHOD - A fixed code book (FCB) search device simplifies an error minimizing process and reduces a calculation amount so as to prevent deterioration of a coding performance. The FCB search device ( | 11-26-2009 |
| 20090292537 | WIDE-BAND ENCODING DEVICE, WIDE-BAND LSP PREDICTION DEVICE, BAND SCALABLE ENCODING DEVICE, WIDE-BAND ENCODING METHOD - There is provided a wide-band LSP prediction device and others capable of predicting a wide-band LSP from a narrow-band LSP with a high quantization efficiency and a high accuracy while suppressing the size of a conversion table correlating the narrow-band LSP to the wide-band LSP. In this device, a non-linear prediction unit ( | 11-26-2009 |
| 20090319264 | SPEECH DECODING APPARATUS, SPEECH ENCODING APPARATUS, AND LOST FRAME CONCEALMENT METHOD - Disclosed is a sound decoding device capable of improving the lost frame compensation performance and improving quality of the decoded sound. In this device, a rise frame sound source compensation unit ( | 12-24-2009 |
| 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 |
| 20100100373 | AUDIO DECODING DEVICE AND AUDIO DECODING METHOD - Provided is an audio decoding device which can adjust the high-range emphasis degree in accordance with a background noise level. The audio decoding device includes: a sound source signal decoding unit ( | 04-22-2010 |
| 20100106488 | VOICE ENCODING DEVICE AND VOICE ENCODING METHOD - Provided is an audio encoding device which can detect an optimal pitch pulse when using pitch pulse information as redundant information. The device includes: a search start decision unit ( | 04-29-2010 |
| 20100211398 | VECTOR QUANTIZER, VECTOR INVERSE QUANTIZER, AND THE METHODS - A vector quantizer which improves the accuracy of vector quantization in switching over a vector quantization codebook on a first stage depending on the type of feature having the correlation with a quantization target vector. In the vector quantizer, a classifier ( | 08-19-2010 |
| 20100232503 | COMMUNICATION SYSTEM, COMMUNICATION METHOD, RADIO TERMINAL, RADIO RELAY DEVICE, AND CONTROL DEVICE - A technique is disclosed, according to which it is possible to efficiently use network resources, to reduce the burden on a control device, and to control the communication between radio terminals by the control device when a transmitting side radio terminal and a receiving side radio terminal are connected to the same radio relay device. According to this technique, when a transmitting side UE | 09-16-2010 |
| 20110040558 | SCALABLE ENCODING APPARATUS, SCALABLE DECODING APPARATUS, SCALABLE ENCODING METHOD, SCALABLE DECODING METHOD, COMMUNICATION TERMINAL APPARATUS, AND BASE STATION APPARATUS - A scalable encoding apparatus, a scalable decoding apparatus and the like are disclosed which can achieve a band scalable LSP encoding that exhibits both a high quantization efficiency and a high performance. In these apparatuses, a narrow band-to-wide band converter receives and converts a quantized narrow band LSP to a wide band, and then outputs the quantized narrow band LSP as converted (i.e., a converted wide band LSP parameter) to an LSP-to-LPC converter. The LSP-to-LPC converter converts the quantized narrow band LSP as converted to a linear prediction coefficient and then outputs it to a pre-emphasizer. The pre-emphasizer calculates and outputs the pre-emphasized linear prediction coefficient to an LPC-to-LSP converter. The LPC-to-LSP converter converts the pre-emphasized linear prediction coefficient to a pre-emphasized quantized narrow band LSP as wide band converted, and then outputs it to a prediction quantizer. | 02-17-2011 |
| 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 |
| 20110125495 | QUANTIZER, ENCODER, AND THE METHODS THEREOF - Disclosed are a quantizer, encoder, and the methods thereof, wherein the computational load is reduced when the values related to the transform coefficients of the principal component analysis transform are quantized when a principal component analysis transform is applied to code stereo. A quantizer ( | 05-26-2011 |
| 20110137643 | SPECTRAL SMOOTHING DEVICE, ENCODING DEVICE, DECODING DEVICE, COMMUNICATION TERMINAL DEVICE, BASE STATION DEVICE, AND SPECTRAL SMOOTHING METHOD - Disclosed is a spectral smoothing device with a structure whereby smoothing is performed after a nonlinear conversion has been performed for a spectrum calculated from an audio signal, and with which the amount of processing calculation is significantly reduced while maintaining excellent audio quality. With this spectral smoothing device, a sub band division unit ( | 06-09-2011 |
| 20110137661 | QUANTIZING DEVICE, ENCODING DEVICE, QUANTIZING METHOD, AND ENCODING METHOD - A quantizing device for more efficient quantization realized by lessening the computational complexity of quantization of a balance weighting factor. The device includes a power/correlation calculating unit ( | 06-09-2011 |
