Abstract: Provided is a multi-channel acoustic signal processing device by which loads of arithmetic operations are reduced. The multi-channel acoustic signal processing device includes: a decorrelated signal generation unit, and a matrix operation unit and a third arithmetic unit. The decorrelated signal generation unit generates a decorrelated signal w? indicating a sound which includes a sound indicated by an input signal x and reverberation, by performing reverberation processing on the input signal x. The matrix operation unit and the third arithmetic unit generate audio signals of m channels, by performing arithmetic operation on the input signal x and the decorrelated signal w? generated by the decorrelated signal generation unit, using a matrix R3 which indicates distribution of a signal intensity level and distribution of reverberation.

Abstract: It possible not only to reduce a delay, but also to enhance the coding efficiency and reduce audio artifact upon coding.

Abstract: Provided is an audio decoder which can reduce an amount of arithmetic operations while suppressing occurrence of aliasing noise. The audio decoder includes: a decoder (102) and an analysis filter bank (110) which generate, from a coded down-mixed signal, the first frequency band signal (x) corresponding to a down-mixed signal (M); a channel expansion unit (130) which converts the first frequency band signal (x) generated by the analysis filter bank (110) into output signals (y) corresponding to respective audio signals of N channels, using BC information; an synthesis filter bank (140) which performs band synthesis for the output signals (y) generate by the channel expansion unit (130) and thereby converts the output signals (y) into the respective audio signals of the N channels on a time axis; and an aliasing noise detection unit (120) which detects occurrence of aliasing noise in the first frequency band signal (x).

Abstract: To provide an acoustic signal processing apparatus which can reduce the amount of calculation in matrix arithmetic. An acoustic signal processing apparatus converts down-mixed acoustic signals of NI channels to acoustic signals of NO channels, where NO>NI.

Abstract: A temporal processing apparatus includes: a splitter splitting an audio signal, included in the sub-band domain, into diffuse signals indicating reverberating components and direct signals indicating non-reverberating components; a downmix unit generating a downmix signal by downmixing the direct signals; BPFs respectively generating a bandpass downmix signal and bandpass diffuse signals; normalization processing units respectively generating a normalized downmix signal and normalized diffuse signals; a scale computation processing unit computing, on a predetermined time slot basis, a scale factor indicating the magnitude of energy of the normalized downmix signal with respect to energy of the normalized diffuse signals; a calculating unit generating scale diffuse signals; a HPF generating high-pass diffuse signals; an adding unit generating addition signals; and a synthesis filter bank performing synthesis filter processing on the addition signals and transforming the addition signals into the time domains.

Abstract: A sending apparatus includes a compressed music data outputting unit that outputs one of compressed music data including compressed basic music data in a first mode and compressed music data including the basic music data as well as high frequency information for extending high frequency of the basic music data in a second mode, and a formatter that transmits a compressed music data outputted by the compressed music data outputting unit first and then music information including a value indicating which mode is used for the compressed music data.

Abstract: A stream playback device for playing back an audio stream including audio frames which are each made up of base data and extension data is provided. The stream playback device includes a decoder and an interface unit operable to receive the audio stream supplied from a stream supply device. The stream playback device notifies the stream supply device whether only the base data or both the base data and the extension data are usable in decoding of the audio stream by the decoder, through the interface unit.

Abstract: A stream playback device for playing back an audio stream including audio frames which are each made up of base data and extension data is provided. The stream playback device includes a decoder and an interface unit operable to receive the audio stream supplied from a stream supply device. The stream playback device notifies the stream supply device whether only the base data or both the base data and the extension data are usable in decoding of the audio stream by the decoder, through the interface unit.

Abstract: Provided is an audio decoder which can reduce an amount of arithmetic operations while suppressing occurrence of aliasing noise. The audio decoder includes: a decoder (102) and an analysis filter bank (110) which generate, from a coded down-mixed signal, the first frequency band signal (x) corresponding to a down-mixed signal (M); a channel expansion unit (130) which converts the first frequency band signal (x) generated by the analysis filter bank (110) into output signals (y) corresponding to respective audio signals of N channels, using BC information; an synthesis filter bank (140) which performs band synthesis for the output signals (y) generate by the channel expansion unit (130) and thereby converts the output signals (y) into the respective audio signals of the N channels on a time axis; and an aliasing noise detection unit (120) which detects occurrence of aliasing noise in the first frequency band signal (x).

Abstract: Digital audio data which have a predetermined packet structure are divided into units including a predetermined number of bits; each unit of the divided digital audio data is converted into specific data to be encoded; the encoded data are arranged in blanking intervals of video data; the digital audio data are transmitted as well as the video data using a transmission line for the video data, and the video data and the audio data may be simultaneously and favorably transmitted, adopting an existing video-data transmission format such as the DVI standard.

Abstract: It possible not only to reduce a delay, but also to enhance the coding efficiency and reduce audio artifact upon coding.

Abstract: Provided is a multi-channel acoustic signal processing device by which loads of arithmetic operations are reduced. The multi-channel acoustic signal processing device (100) includes: a decorrelated signal generation unit (181), and a matrix operation unit (187) and a third arithmetic unit (186). The decorrelated signal generation unit (181) generates a decorrelated signal w? indicating a sound which includes a sound indicated by an input signal x and reverberation, by performing reverberation processing on the input signal x. The matrix operation unit (187) and the third arithmetic unit (186) generate audio signals of m channels, by performing arithmetic operation on the input signal x and the decorrelated signal w? generated by the decorrelated signal generation unit (181), using a matrix R3 which indicates distribution of a signal intensity level and distribution of reverberation.

Abstract: To provide an acoustic signal processing apparatus which can reduce the amount of calculation in matrix arithmetic. An acoustic signal processing apparatus (24) converts down-mixed acoustic signals of NI channels to acoustic signals of NO channels, where NO>NI.

Abstract: A temporal processing apparatus (energy shaping apparatus) (600a) includes: a splitter (601) splitting an audio signal, included in the sub-band domain, which are obtained through a hybrid time and frequency transformation into diffuse signals indicating reverberating components and direct signals indicating non-reverberating components; a downmix unit (604) generating a downmix signal by downmixing the direct signals; BPFs (605 and 606) respectively generating a bandpass downmix signal and bandpass diffuse signals, by performing bandpass processing on the downmix signal and the diffuse signals on a sub-band-to-sub-band basis, which are split on the sub-band basis; normalization processing units (607 and 608) respectively generating a normalized downmix signal and normalized diffuse signals by normalizing the bandpass downmix signal and the bandpass diffuse signals with regard to respective energy; a scale computation processing unit (609) computing, on a predetermined time slot basis, a scale factor indicati

Abstract: A signal processing device (1) includes: a generation unit (32) which generates a second signal from a first signal that is obtained by downmixing two signals; a mixing coefficient determination unit (40) which determines, based on a value L and a value ?, a mixing degree for mixing the first signal and the second signal, the value L indicating a level ratio between the two signals, and the value ? indicating a phase difference between the two signals; and a mixing unit (50) which mixes the first signal and the second signal based on the mixing degree determined by the mixing coefficient determination unit (40). The generation unit (32) includes: a first filter (302) which generates a low frequency band signal in the second signal, from a low frequency band signal in the first signal; and a second filter (a processing unit 307) which generates a high frequency band signal in the second signal, from a high frequency band signal in the first signal.

Abstract: A distribution system includes a distribution server device, an acquisition device, and an audio reproduction device, and distributes a program for decoding encoded audio data. The distribution server device sends the program for decoding the encoded audio data. The acquisition device is connected to the distribution server device via a network, and acquires the program and stores it in a removable memory unit. The audio reproduction device decodes the encoded audio data using the program stored in the removable memory unit, and outputs sounds.

Abstract: This invention provides a data transmission method and a data receiving method which enable audio data to be multiplexed into video data and be transmitted using a DVI standard cable or the like satisfactorily with a simple configuration. From a data transmitting end, a superimposed video/audio data signal in which audio data are superimposed over a video blanking interval of video data in superimposition timing that is generated using a video blank sync signal and a pixel clock, are transmitted to a data receiving end through the DVI cable, together with the video blank sync signal and the pixel clock.

Abstract: A stream playback device for playing back an audio stream including audio frames which are each made up of base data and extension data is provided. The stream playback device includes a decoder and an interface unit operable to receive the audio stream supplied from a stream supply device. The stream playback device notifies the stream supply device whether only the base data or both the base data and the extension data are usable in decoding of the audio stream by the decoder, through the interface unit.

Abstract: A signal processing apparatus includes a decoder for decoding a stream signal so as to generate a digital audio signal of a low frequency effect channel and digital audio signals of first through n'th (n?2) channels; an adder section for adding the digital audio signal of the low frequency effect channel and the digital audio signal of a specified channel among the first through n'th channels, so as to generate an addition signal; an n number of D/A conversion sections for converting the digital audio signals of the first through n'th channels, excluding the digital audio signal of the specified channel, and the addition signal into n types of analog audio signals; a first signal processing section for generating a digital audio signal of the low frequency effect channel; and a second signal processing section for generating an analog audio signal of the specified channel.

Abstract: The present invention is relative to a video signal transmitting/receiving system in which digital video signals are transmitted from a transmitter (30) to a receiver (50) using a line (9) as a transmission channel. The transmitter (30) converts the video signals to be transmitted to a bit string longer in data length than a pixel making up the video signals, allocates a plural number of the bit strings to a blanking period during which pixel data in the pixel string is not transmitted and, using these bit strings, transmits the same superposed data a plural number of times. The receiver (50) extracts the specified bit strings indicating the blanking period from the received data and performs majority processing on the results of demodulation of the extracted bit strings to decide on output data. This reduces errors in reception of supplementary data to simplify the circuit structure as well as to ameliorate the error rate.