Abstract: The disclosed active vibration noise control device is suitable for use in cancelling out vibration noise by outputting control noise from a plurality of speakers. When a vibration noise frequency is in a dip bandwidth, the active vibration noise control device alters the step size parameters used to update the filter coefficient at at least one filter coefficient update means from among a plurality of filter coefficient update means. Thus, the filter coefficient update speed can be retarded in unstable dip bandwidths, enabling loss in silencing effect which occurs during dip characteristics to be appropriately reduced.

Abstract: An active vibration noise control device cancels vibration noise by making plural speakers generate control sounds. The active vibration noise control device selects one or more speakers which output the control sounds, from plural speakers, based on a relationship between (1) a first phase difference which corresponds to a difference between phase characteristics of the vibration noise from a vibration noise source to an evaluation point and phase characteristics of the vibration noise from the vibration noise source to a pseudo evaluation point and (2) a second phase difference for each of the plural speakers corresponding to a difference between phase characteristics of the control sound from the speaker to the evaluation point and phase characteristics of the control sound from the speaker to the pseudo evaluation point. Therefore, it stably decreases the vibration noise at the pseudo evaluation point independently of a frequency band of the vibration noise.

Abstract: An audio signal processing apparatus includes a cutout unit, a correlation calculating unit, a spectrum calculating unit, a coefficient calculating unit, and an assigning unit. The cutout unit cuts out audio signals of plural channels by a time frame. The correlation calculating unit calculates a correlation value between respective signals of the plural channels included in a predetermined time frame cut out by the cutout unit. The spectrum calculating unit calculates spectrum information indicative of spectral characteristics concerning a signal of a given channel cut out by the cutout unit. The coefficient calculating unit calculates a coefficient to be multiplied by the signal of the given channel, based on the correlation value and the spectrum information. The assigning unit multiplies the coefficient by the signal of the given channel and assigns the multiplied signal to channels other than the given channel.

Abstract: An active vibration noise control device is preferably used for cancelling a vibration noise by making a speaker generate a control sound. The active vibration noise control device includes a step-size parameter changing unit which changes a step-size parameter used for updating a filter coefficient. The step-size parameter changing unit calculates a parameter-for-change based on the filter coefficient updated by using a basic step-size parameter, and changes the basic step-size parameter by a minimum value in the previously calculated parameter-for-change. Therefore, it is possible to appropriately change the step-size parameter by using the minimum value of the parameter-for-change. Hence, it becomes possible to effectively suppress a divergence of an adaptive notch filter due to a secular change of the speaker.

Abstract: A sound field adjusting device reproduces signals from plural speaker pairs arranged in an acoustic space. The device supplies signals to the plural speakers, gives different delays for the respective frequency bands to the signals supplied to at least to a proximity speaker pair which is a speaker pair closest to a listening position among the plural speakers, and gives a delay of a constant delay amount regardless of the frequency band to the speaker pairs other than the speaker pair to which the delays of different delay amounts for the respective frequency bands are given. In this case, the sound field adjusting device does not perform level adjustment, and the sound field adjustment is performed by only adjusting the delay amounts. Therefore, deterioration of sound pressure balance at the position other than the listening position can be avoided, and sound pressure balance at the listening position improved.

Abstract: A center channel positioning apparatus is provided, which does not cause strange feeling in sound quality even at a position apart from an original listener position. A sound signal processing unit (40) changes a phase of at least one of a left sound signal for center channel positioning (CL) and a right sound signal for center channel positioning (CR), based on a processing coefficient, and causes a left speaker (46) and a right speaker (52) to output sound based on a center channel sound signal (C). The processing coefficient is calculated based on the difference in level between both ears in the case where the left sound signal for center channel positioning (CL) for the left speaker (46), and the right sound signal for center channel positioning (CR) for the right speaker (52) are reproduced simultaneously.

Abstract: An active vibration noise control device having a pair of speakers, including: a basic signal generating unit generating a basic signal based on a vibration noise frequency; an adaptive notch filter generating a first control signal provided to one speaker using a first filter coefficient and generating a second control signal provided to the other speaker using a second filter coefficient to cancel the generated vibration noise; a microphone detecting cancellation error between the vibration noise and the control sounds and outputting an error signal; a reference signal generating unit generating a reference signal based on a transfer function from the speakers to the microphone; a filter coefficient updating unit updating first and second filter coefficients, minimize the error signal; and a phase difference limiting unit limiting a phase difference between control sounds generated by different speakers. Therefore, it becomes possible to appropriately ensure a uniform and wide noise-cancelled area.

Abstract: The present invention provides a sound reproducing system and a sound reproducing apparatus that can provide a high realistic sensation to a user, without having to do a troublesome task on the user's side. A surround-sound system (100) includes: an array speaker system (20) that is formed with speaker units SPU having the same characteristics; and a signal processing apparatus (120) that drives the speaker units SPU independently of one another and amplifies an audio signal.

Abstract: An object of the present invention is to retrieve and process a piece of content to be processed by a simple method at the time of storing content recorded in a CD into an HDD or the like, reading desired content out of the content stored in the HDD from the HDD, and performing a process such as reproduction on the read content. A processor of the invention includes: a storage 1 for storing at least one piece of information so as to be associated with jacket image information of an image related to the content; means for obtaining target medium image data by capturing an image of a jacket of a CD related to the content to be reproduced; means for collating the target medium image data with jacket image information stored in the storage 1 and obtaining the content corresponding to the target medium image data from the storage 1; and means for reproducing the obtained content.

Abstract: Sound pressure acquisition element integrate by time and convert into logarithms a plurality of inputted sound signals to acquire each sound pressure corresponding to the plurality of sound signals. Normalizing element normalizes each sound pressure acquired by the sound pressure acquisition element. Linear sum calculating element calculates a linear sum of each sound pressure normalized by the normalizing element using a plurality of parameters which differ for each frequency range of the sound signals.

Abstract: At least two speakers are arranged in the left-right direction, and the measurement signal generating unit generates the measurement signal from the two speakers. The measurement signal outputting unit outputs the measurement signal. The measurement signal collecting unit collects the measurement signal for the left-right direction from at least two positions along the left-right direction axis in the acoustic space. The delay correcting unit performs the delay adjustment for any one of the speakers in the acoustic space, based on information that the measurement signal collecting unit obtains by collecting the measurement signal for the left-right direction, until the level difference in the left-right direction becomes equal to or smaller than the predetermined value. The sound field correcting device collects the measurement signal from two positions along the left-right direction axis, and reduces the level difference in the left-right direction based on the information obtained by collecting the sound.

Abstract: The present invention provides a sound field correcting system and a reverberation adjusting apparatus capable of correcting a reverberation time characteristic by an easy operation without setting a complicated parameter. A surround system 100 has a sound reproducing apparatus 120 for adjusting a reverberation component of sound on the basis of a reverberation characteristic of a listening room 10 and amplifying the sound by a speaker system 130; and a microphone 140 for collecting the amplified sound in a specific listening position in the listening room 10.

Abstract: The present invention provides a sound reproducing system capable of accurately analyzing a reverberation characteristic of amplified sound including an arrival direction of a reverberation component, which is more natural, and has higher realistic sensation. A surround system 100 has a speaker system 130, a signal processing apparatus 120 for recognizing a reverberation characteristic of a listening room 10 and adjusting a reverberation component of sound source to be amplified on the basis of the recognized reverberation characteristic, and a microphone array 140 constructed by a plurality of microphones M disposed in the listening room 10 and having the same characteristics, and in which distances among the microphones M are determined in advance. In the case where sound source is amplified and output from the speaker system 130 to the listening room 10, the microphone array 140 collects amplified sound in a specific listening position in the listening room 10.

Abstract: A delay amount determination device, sound image localization device, delay amount determination method, and delay amount determination processing program capable of efficiently determining a parameter using fewer test sounds are provided. If the localization direction of the sound image when the test sound is outputted from left and right speakers is specified by the user through an input unit, an operation unit finds the localization angle corresponding to the localization direction. The operation unit, if finding localization angles with two different delay values, compares the difference of the two localization angles with a threshold value. The operation unit, if judging that the difference is larger than the threshold value, changes one of the delay values, finds the localization angle corresponding to the changed delay value, and further compares the difference of the two localization angles with the threshold value.

Abstract: An audio reproduction device reproduces a one-channel signal from two speakers arranged in a sound field. The one-channel input signal is delayed by a delay element. The delay element performs a delay with different delay amount for a plurality of frequency bands. The signal delayed by the delay element is outputted to one of the two speakers and the input signal is directly outputted to the other one of the two speakers.

Abstract: A sound image localization processing apparatus is provided, in which a surround system is realized by a front speaker with a simple signal process, and the same side localization effect can be given to a plurality of listeners. A sound image localization processing apparatus 100 causes two speakers FR, FL disposed at the right and the left in front of a listener to output sound in accordance with a plurality of supplied sound signals, and gives a sound space with a sense of realism to the listeners.

Abstract: A surround effect in low-tone range can be improved when speakers to be positioned in front of a listener are used to realize a surround sound. A left surround signal extracting part 11 outputs a left surround signal Ls to a speaker LSP as it is, an attenuating part 12 attenuates the left surround signal Ls from the left surround signal extracting part 11, a delaying part 13 delays it per frequency band, and outputs it to a center speaker CSP, and a phase inverting part 14 inverts a phase of the left surround signal Ls from the left surround signal extracting part 11, and outputs it to a speaker RSP.

Abstract: A center channel positioning apparatus is provided, which does not cause strange feeling in sound quality even at a position apart from an original listener position. A sound signal processing unit (40) changes a phase of at least one of a left sound signal for center channel positioning (CL) and a right sound signal for center channel positioning (CR), based on a processing coefficient, and causes a left speaker (46) and a right speaker (52) to output sound based on a center channel sound signal (C). The processing coefficient is calculated based on the difference in level between both ears in the case where the left sound signal for center channel positioning (CL) for the left speaker (46), and the right sound signal for center channel positioning (CR) for the right speaker (52) are reproduced simultaneously.

Abstract: In this signal processing apparatus, a first-audio-parameter calculating unit calculates a first audio parameter based on two audio signals. A second-audio-parameter calculating unit calculates a second audio parameter based on the two audio signals. A surround-signal generating unit generates surround components to be respectively allocated to surround signals.

Abstract: An audio signal processing apparatus includes a cutout unit, a correlation calculating unit, a spectrum calculating unit, a coefficient calculating unit, and an assigning unit. The cutout unit cuts out audio signals of plural channels by a time frame. The correlation calculating unit calculates a correlation value between respective signals of the plural channels included in a predetermined time frame cut out by the cutout unit. The spectrum calculating unit calculates spectrum information indicative of spectral characteristics concerning a signal of a given channel cut out by the cutout unit. The coefficient calculating unit calculates a coefficient to be multiplied by the signal of the given channel, based on the correlation value and the spectrum information. The assigning unit multiplies the coefficient by the signal of the given channel and assigns the multiplied signal to channels other than the given channel.