Audio playback system
View Patent ↗Provided is an audio playback system, which reduces a restriction on a place of installation and which reduces the dispersion of characteristics of sound pressures in a low frequency range due to the seats in a passenger interior of a vehicle so that a comfortable bass sound can be enjoyed at any seat. The audio playback system comprises a first filter ( 108 ), to which an audio signal outputted from a playback apparatus ( 107 ) is inputted, configured to pass a frequency band lower than a first-order resonance frequency of the passenger interior of the vehicle, a first sub-woofer ( 104 ) configured to receive an output signal of the first filter ( 108 ), a second filter ( 109 ), to which the audio signal from the playback device ( 107 ) is inputted, configured to pass a frequency band including the first-order resonance frequency of the interior, and a second sub-woofer ( 105 ), to which an output signal of the second filter ( 109 ) is inputted, configured to be installed near a node of a first-order resonance mode of the interior.
1. An audio playback system comprising:
a first filter, to which an audio signal outputted from a playback apparatus is inputted, configured to pass a frequency band lower than a first-order resonance frequency of an interior of a vehicle;
a first subwoofer configured to receive an output signal of the first filter;
a second filter, to which the audio signal from the playback apparatus is inputted, configured to pass a frequency band including the first-order resonance frequency of the interior; and
a second subwoofer, to which an output signal of the second filter is inputted, configured to be installed near a node of a first-order resonance mode of the interior.
2. The audio playback system according to claim 1 , wherein:
the first subwoofer is installed in a rear shelf in the interior; and
the first filter is a low pass filter with a cutoff frequency equal to or lower than the first-order resonance frequency of the interior.
3. The audio playback system according to claim 1 , wherein the second filter is a bandpass filter with a passband including the first-order resonance frequency of the interior.
4. The audio playback system according to claim 1 , wherein the second filter is an octave bandpass filter with a passband including the first-order resonance frequency of the interior.
5. The audio playback system according claim 1 , wherein the second filter is an octave bandpass filter in which a center frequency is the first-order resonance frequency of the interior.
6. The audio playback system according to claim 1 , further comprising:
a third filter, to which the output signal of the playback apparatus is inputted, configured to pass a band of a second-order resonance frequency of the interior; and
a third subwoofer, to which an output signal of the third filter is inputted, configured to be installed near a node of the second-order resonance mode of the interior.
7. The audio playback system according to claim 6 , wherein the third filter is a bandpass filter with a passband including the second-order resonance frequency of the interior.
8. The audio reproduction apparatus according to claim 6 , wherein the third filter is an octave bandpass filter, and a center frequency thereof is the second-order resonance frequency of the interior.
9. The audio playback system according to claim 6 , further comprising:
a fourth filter, to which the output signal of the playback apparatus is inputted, configured to pass the frequency band including the second-order resonance frequency of the interior; and
a fourth subwoofer configured to be installed near another node different from the node, on which the third subwoofer is installed, of the second-order resonance mode.
10. The audio playback system according to claim 9 , wherein the fourth filter is a bandpass filter with passband including the second-order resonance frequency of the interior.
11. The audio playback system according to claim 9 , wherein the fourth filter is an octave bandpass filter, and a center of a passband thereof is the second-order resonance frequency of the interior.