Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Dolby International Ab

Panasonic Intellectual Property Corporation of America

Nec Corporation

Panasonic Intellectual Property Management Co., Ltd.

Takeshi Norimatsu

Mineo Tsushima

Tomokazu Ishikawa

Naoya Tanaka

Kok Seng Chong

Kosuke Nishio

Shuji Miyasaka

Huan Zhou

Haishan Zhong

Akihisa Kawamura

Sua Hong Neo

Yoshihisa Nakatoh

Kojiro Ono

Masahiro Serizawa

Toshiyuki Nomura

Osamu Shimada

Yoshiaki Takagi

Mitsuhiko Serikawa

Yuichiro Takamizawa

Yoshiaki Sawada

Kim Hann Kuah

Masaharu Matsumoto

Takashi Katayama

Mikio Oda

Taro Katayama

Hiroko Numazu

Junichi Nakahashi

Yoriko Yagi

Zhong Hai Shan

Yosiaki Takagi

Masayuki Misaki

Tsuneo Tanaka

Michio Matsumoto

Ryou Tagami

Ryo Tagami

Dan Zhao

Toshihiko Nagano

Kazue Kita

Lih Horng Tee

Syuji Miyasaka

Yoshihisa Nakato

To provide a bandwidth extension method which allows reduction of computation amount in bandwidth extension and suppression of deterioration of quality in the bandwidth to be extended. In the bandwidth extension method: a low frequency bandwidth signal is transformed into a QMF domain to generate a first low frequency QMF spectrum; pitch-shifted signals are generated by applying different shifting factors on the low frequency bandwidth signal; a high frequency QMF spectrum is generated by time-stretching the pitch-shifted signals in the QMF domain; the high frequency QMF spectrum is modified; and the modified high frequency QMF spectrum is combined with the first low frequency QMF spectrum.

Bandwidth extension method, bandwidth extension apparatus, program, integrated circuit, and audio decoding apparatus

An encoding device () includes an MDCT unit () that transforms an input signal in a time domain into a frequency spectrum including a lower frequency spectrum, a BWE encoding unit () that generates extension data which specifies a higher frequency spectrum at a higher frequency than the lower frequency spectrum, and an encoded data stream generating unit () that encodes to output the lower frequency spectrum obtained by the MDCT unit () and the extension data obtained by the BWE encoding unit (). The BWE encoding unit () generates as the extension data (i) a first parameter which specifies a lower subband which is to be copied as the higher frequency spectrum from among a plurality of the lower subbands which form the lower frequency spectrum obtained by the MDCT unit () and (ii) a second parameter which specifies a gain of the lower subband after being copied.

Encoding device and decoding device

A sound signal hybrid encoder includes: a signal analysis unit which determines a scheme for encoding a frame included in a sound signal; an LFD encoder which encodes a frame to generate an LFD frame; an LP encoder which encodes a frame to generate an LP frame; a switching unit which switches between the encoders according to a result of the determination by the signal analysis unit; and an AC signal generation unit which generates an AC signal according to a scheme selected from among schemes, outputs the generated AC signal, and also outputs an AC flag indicating the selected scheme.

Sound signal hybrid encoder, sound signal hybrid decoder, sound signal encoding method, and sound signal decoding method

A new hybrid audio decoder and a new hybrid audio encoder having block switching for speech signals and audio signals are provided. Currently, very low bitrate audio coding methods for speech and audio signals are proposed. These audio coding methods cause very long delays. Generally, in coding an audio signal, an algorithm delay tends to be long to achieve higher frequency resolution. In coding a speech signal, the delay needs to be reduced because the speech signal is used for telecommunication. To balance fine coding quality for speech and audio input signals with very low bitrate, a combination of a low delay filter bank like AAC-ELD and a CELP coding method is provided.

Hybrid audio encoder and hybrid audio decoder which perform coding or decoding while switching between different codecs

An encoding and decoding system includes: a characteristic determining unit which determines whether a sound signal is a speech signal or an audio signal; an encoder which encodes the sound signal into an encoded signal, based on a determination by the characteristic determining unit; a transmitting unit which transmits the encoded signal; a receiving unit which receives the encoded signal; a decoder which decodes the encoded signal; and a packet loss detecting unit which detects a loss of data of the encoded signal and transmits a notification indicating the loss of the data to the characteristic determining unit. Upon receiving the notification indicating the loss of the data, the characteristic determining unit causes the encoder to encode the sound signal portion into a signal portion composed of independently decodable frames.

Encoding and decoding system, decoding apparatus, encoding apparatus, encoding and decoding method

An audio rendering device which uses multichannel speakers includes: a first delay computation unit which computes, based on rendering information about the multichannel speakers, a first delay corresponding to a primary wavefront which propagates in a predetermined traveling direction from a sound source that is each of speakers included in the multichannel speakers; a second delay computation unit which computes, based on the rendering information about the multichannel speakers, a second delay corresponding to a secondary wavefront which is generated by the primary wavefront and has a scattering wavefront; an addition unit which adds up the first delay and the second delay to compute a total delay; and a delay filter which applies the total delay to an input audio signal to generate a multichannel audio signal for use in rendering with the multichannel speakers, and outputs the multichannel audio signal to the multichannel speakers.

Audio rendering device and audio rendering method

Growing community of inventors

Hyogo, Japan

Takeshi Norimatsu