Abstract: The invention relates to an acoustic impedance matching device arranged so as to be mounted behind a loudspeaker. Said device comprises a chamber at least partially filled with an absorbent material. Said device is characterized in that the cross-section of the chamber increases with the distance from the loudspeaker, and the density of the absorbent material increases with the distance from the loudspeaker.

Abstract: The invention relates to an acoustic impedance matching device arranged so as to be mounted behind a loudspeaker. Said device comprises a chamber at least partially filled with an absorbent material. Said device is characterized in that the cross-section of the chamber increases with the distance from the loudspeaker, and the density of the absorbent material increases with the distance from the loudspeaker.

Abstract: The invention relates to a loudspeaker membrane having a sandwich structure, having a central web separating two layers of material based on high-rigidity threads impregnated with a polymer resin, characterized in that the central web is formed from a layer of material based on oriented natural fibers that are impregnated with a polymer resin.

Abstract: The invention relates to a loudspeaker membrane having a sandwich structure, having a central web separating two layers of material based on high-rigidity threads impregnated with a polymer resin, characterized in that the central web is formed from a layer of material based on oriented natural fibres that are impregnated with a polymer resin.

Abstract: A circuit for processing multichannel audio signals, comprises a frequency characteristics correction device and an output device. The frequency characteristics correction device corrects frequency characteristics of an audio signal of a channel including an audio signal component having a predetermined frequency band, of audio signals of a multichannel comprising at least a right channel and a left channel, in accordance with correction characteristics determined based on a head related transfer function. The output device mixes the audio signal component having the frequency characteristics corrected with an audio signal of the right channel and an audio signal of the left channel to generate mixed output audio signals, and outputting the mixed output audio signals as a right channel output audio signal and a left channel output audio signal.

Abstract: Stream audio signals input in channel input terminals (710FL, 710FR) of a large setting are passed through large high-bandpass filters (720) arranged identically to small high-bandpass filters (740) for extracting high-frequency components from stream audio signals input in channel input terminals (710C, 710SL, 710SR, 710SBL, 710SRB) of a small setting. The stream audio signals are also passed through large low-bandpass filters (730) for extracting low-frequency components blocked by the large high-bandpass filters (720). The extracted high-frequency components and the extracted low-frequency components are added together by large adders (780) so as to be output. Phases of the stream audio signals in different settings can be matched, thereby contributing to favorable reproduction.

Abstract: A circuit for processing multichannel audio signals, comprises a frequency characteristics correction device and an output device. The frequency characteristics correction device corrects frequency characteristics of an audio signal of a channel including an audio signal component having a predetermined frequency band, of audio signals of a multichannel comprising at least a right channel and a left channel, in accordance with correction characteristics determined based on a head related transfer function. The output device mixes the audio signal component having the frequency characteristics corrected with an audio signal of the right channel and an audio signal of the left channel to generate mixed output audio signals, and outputting the mixed output audio signals as a right channel output audio signal and a left channel output audio signal.

Abstract: A circuit for processing multichannel audio signals, comprises a frequency characteristics correction device and an output device. The frequency characteristics correction device corrects frequency characteristics of an audio signal of a channel including an audio signal component having a predetermined frequency band, of audio signals of a multichannel comprising at least a right channel and a left channel, in accordance with correction characteristics determined based on a head related transfer function. The output device mixes the audio signal component having the frequency characteristics corrected with an audio signal of the right channel and an audio signal of the left channel to generate mixed output audio signals, and outputting the mixed output audio signals as a right channel output audio signal and a left channel output audio signal.

Abstract: An audio reproducing device (100) includes: (i) signal level detection means (102) for detecting a signal level of an audio signal; (ii) sound pressure adjusting means (104) for changing the sound pressure level indicating the amplification ratio of the audio signal; (iii) frequency characteristic correction means (106) for correcting the frequency characteristic of the audio signal according to a correction amount; and (iv) control means (103) for deciding the correction amount according to the signal level and the sound pressure level and successively controlling the frequency characteristic correction means to perform correction according to the decided correction amount.

Abstract: A standing wave absorbing device for a vehicle, includes a sound tube provided at a predetermined position within a compartment or inside a door. The sound tube absorbs unwanted standing wave occurring within the compartment or inside the door.

Abstract: A magnet (300) is arranged substantially at the center of the bottom section (210) of a frame (200) and a diaphragm (500) provided with a coil bobbin (570) around which a voice coil (600) is wound is fitted to the frame (200) so as to close the opening (233) of the frame (200). Then, the diaphragm (500) is covered by a protective member (700). A fitting section (240) to be fitted to a receiving member (800) is extended from the outer peripheral surface of the bottom section (210) of the frame (200) substantially along a plane that includes the center of gravity G of the speaker and runs substantially in parallel with the plane of the opening of the frame (200), or a plane that includes the center of gravity G of the speaker and runs substantially perpendicularly to the direction of vibrations of the diaphragm (500) so as to appear like a sword guard.

Abstract: First auxiliary speakers are mounted in the vehicle-passenger space with respect to main speakers providing for acoustic reproduction in the vehicle-passenger space. The first auxiliary speakers output sound in the same frequency band as that of sound outputted from the main speakers. Acoustic outputs of the first auxiliary speakers are set to make a sound pressure of the sound reaching a listener sit in the vehicle-passenger space from the first auxiliary speakers nearly equal to a sound pressure of the sound reaching the listener from the main speakers.

Abstract: A controller (710) having recognized an output request for bass mood sounds in response to an input operation by the audience sets a prespecified low-pass filter (830) by switching a filter selecting section (840) and a bass sound processing switching section (870). The audio data inputted from input terminals (631) respectively is subjected to adjustment of the output level as well as to the effect processing, and then is passed through the prespecified low-pass filter (830) to adjust the output, and then is outputted from output terminals (638) corresponding to speakers (230) for bass mood sounds. Audio data outputted from other speakers (230) is subjected to output adjustment, and is subjected to the delay processing according to a delay time computed by the controller through an operational expression approximated with a quadratic expression for a cut-off frequency in the low-pass filter (830) to be outputted from the output terminals (638) corresponding to the speakers (230).

Abstract: In a sound signal playback machine and method thereof, predetermined high frequency components are extracted from sound signals SL to SC of a main channel by high frequency pass filters 21 to 25, and these high frequency components are respectively played back by speakers. At the same time, predetermined low frequency components are extracted from sound signals SL to SC of the main channel by low frequency pass filters. These low frequency components and sound signal SLFE exclusively used for the low frequency band are added to each other, and the thus obtained addition signal is played back by the speaker 66. In this case, the degree of the low frequency pass filters is set higher than the degree of the high frequency pass filters, and the high frequency component is delayed.

Abstract: A circuit for processing multichannel audio signals, comprises a frequency characteristics correction device and an output device. The frequency characteristics correction device corrects frequency characteristics of an audio signal of a channel including an audio signal component having a predetermined frequency band, of audio signals of a multichannel comprising at least a right channel and a left channel, in accordance with correction characteristics determined based on a head related transfer function. The output device mixes the audio signal component having the frequency characteristics corrected with an audio signal of the right channel and an audio signal of the left channel to generate mixed output audio signals, and outputting the mixed output audio signals as a right channel output audio signal and a left channel output audio signal.

Abstract: An audio apparatus includes a main audio signal processing circuit (12) for processing an audio signal read from a sound source (10), and a set of main speakers (SPA) and at least one set of sound effect speakers (SPB, SPC, etc.) which receive inputs of the audio signal undergoing the signal processing by the signal processing circuit (12). The main speaker (SPA) is mounted on an A-pillar (AP) in a vehicle passenger space, for example. The sound effect speakers (SPB, SPC, etc.) are mounted in a lower portion of the console (C), for example.

Abstract: An audio apparatus has a main speaker SPA receiving an audio signal from a sound source 10 and outputting sound of the sound source; sound effect audio signal processing circuits 12B, 12C, etc. for performing signal processing on the audio signal from the sound source 10 to generate a sound effect audio signal for reproduction of a sound effect required of the sound of the sound source; and sound effect speakers SPB, SPC, etc. each receiving the sound effect audio signal and outputting the sound effect required of the sound of the sound source.

Abstract: In a sound signal playback machine and method thereof, predetermined high frequency components are extracted from sound signals SL to SC of a main channel by high frequency pass filters 21 to 25, and these high frequency components are respectively played back by speakers. At the same time, predetermined low frequency components are extracted from sound signals SL to SC of the main channel by low frequency pass filters. These low frequency components and sound signal SLFE exclusively used for the low frequency band are added to each other, and the thus obtained addition signal is played back by the speaker 66. In this case, the degree of the low frequency pass filters is set higher than the degree of the high frequency pass filters, and the high frequency component is delayed.

Abstract: In a sound signal playback machine and method thereof, predetermined high frequency components are extracted from sound signals SL to SC of a main channel by high frequency pass filters 21 to 25, and these high frequency components are respectively played back by speakers. At the same time, predetermined low frequency components are extracted from sound signals SL to SC of the main channel by low frequency pass filters. These low frequency components and sound signal SLFE exclusively used for the low frequency band are added to each other, and the thus obtained addition signal is played back by the speaker 66. In this case, the degree of the low frequency pass filters is set higher than the degree of the high frequency pass filters, and the high frequency component is delayed.