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Patexia Research
Patent No. US 11212614
Issue Date Dec 28, 2021
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Patent 11212614 - Audio system and method for controlling an audio system > Claims

  • 1. An audio system, having (a) a control circuit,(b) at least one loudspeaker, and(c) at least one subwoofer for reproducing audio signals at low frequencies,wherein the control circuit comprises: (i) an input connector,(ii) a bass management circuit comprising a first filter for pre-filtering audio signals for the at least one subwoofer and a second filter for pre-filtering audio signals for the at least one loudspeaker, and(iii) an output with a first output connector for the at least one subwoofer and with a second output connector for the at least one loudspeaker,wherein the first filter comprises a low-pass with a first amplitude response,wherein the at least one loudspeaker comprises a high-pass filter with a second amplitude response, and wherein there is a transition frequency range of the amplitude responses of the first filter and the high-pass filter in which both the first filter and the high-pass filter modify the audio signals by amplifying or attenuating,and wherein the second filter comprises at least two parametric filters adapted for flattening a resulting amplitude response in the transition frequency range, the at least two parametric filters having different center frequencies within the transition frequency range.
    • 2. The audio system according to claim 1, wherein the second filter comprises at least one parametric bell filter.
    • 3. The audio system according to claim 1, wherein the second filter has an amplitude response that is substantially transparent at a frequency where the first amplitude response has a maximum.
    • 4. The audio system according to claim 1, wherein a resulting amplitude response of the audio system, without usage of the second filter, has a waviness of at least ±1 dBSPL in the transition frequency range, and with usage of the second filter has a waviness of less than ±1 dBSPL in the transition frequency range.
  • 5. A control circuit for an audio system, comprising (a) an input connector,(b) a bass management circuit comprising a first filter for pre-filtering audio signals for at least one subwoofer and a second filter for pre-filtering audio signals for at least one loudspeaker, and(c) an output with a first output connector for the at least one subwoofer and with a second output connector for the at least one loudspeaker,wherein the first filter comprises a low-pass with a first amplitude response, and wherein the at least one loudspeaker comprises a high-pass filter with a second amplitude response, wherein there is a transition frequency range of the first amplitude response of the first filter and the second amplitude response of the high-pass filter in which both the first filter and the high-pass filter modify the audio signals by attenuating or amplifying,and wherein the second filter comprises at least two parametric filters that have different center frequencies within the transition frequency range and that are adapted at least to the second amplitude response of the high-pass filter and that flatten a resulting amplitude response in the transition frequency range.
    • 6. The control circuit according to claim 5, wherein the second filter has an amplitude response that is substantially transparent at a frequency where the first amplitude response has a maximum.
    • 7. The control circuit according to claim 5, wherein at least one of the parametric filters is a bell filter.
    • 8. The control circuit according to claim 5, wherein the resulting amplitude response results from a superposition of the first filter and a serial connection of the second filter and the high-pass filter, and wherein the resulting amplitude response comprises an overall waviness of less than ±1 dBSPL in the transition frequency range.
  • 9. A method for controlling an audio system comprising a control circuit, at least one loudspeaker with a high-pass filter, and at least one subwoofer for reproducing audio signals at low frequencies, wherein the control circuit comprises a bass management circuit, and wherein the method comprises the following steps: in the bass management circuit, pre-filtering audio signals for the at least one subwoofer in a first filter and pre-filtering audio signals for the at least one loudspeaker in a second filter,wherein the first filter comprises a low-pass and has a first amplitude response and wherein the high-pass filter has a second amplitude response,wherein, in a transition frequency range of the amplitude responses of the first filter and the high-pass filter, both filters modify the audio signals by attenuating or raising,wherein the second filter comprises at least one parametric filter adapted for flattening a resulting amplitude response in the transition frequency range, andwherein an overall amplitude response of the audio system has a waviness of less than ±1 dBSPL in the transition frequency range.
    • 10. The method according to claim 9, wherein the second filter comprises at least one parametric bell filter.
    • 11. The method according to claim 9, wherein the second filter comprises two or more parametric filters.
      • 12. The method according to claim 11, wherein the two or more parametric filters have different center frequencies, and the center frequencies of each of the parametric filters are within the transition frequency range.
    • 13. The method according to claim 9, wherein the second filter has an amplitude response that is substantially transparent at a frequency where the first amplitude response has a maximum.
  • 14. An audio system, having (a) a control circuit,(b) at least one loudspeaker, and(c) at least one subwoofer for reproducing audio signals at low frequencies,wherein the control circuit comprises: (i) an input connector,(ii) a bass management circuit comprising a first filter for pre-filtering audio signals for the at least one subwoofer and a second filter for pre-filtering audio signals for the at least one loudspeaker, and(iii) an output with a first output connector for the at least one subwoofer and with a second output connector for the at least one loudspeaker,wherein the first filter comprises a low-pass with a first amplitude response,wherein the at least one loudspeaker comprises a high-pass filter with a second amplitude response, and wherein there is a transition frequency range of the amplitude responses of the first filter and the high-pass filter in which both, the first filter and the high-pass filter, modify the audio signals by amplifying or attenuating,wherein the second filter comprises at least one parametric filter adapted for flattening a resulting amplitude response in the transition frequency range,and wherein the second filter has an amplitude response that is substantially transparent at a frequency where the first amplitude response has a maximum.
  • 15. An audio system, having (a) a control circuit,(b) at least one loudspeaker, and(c) at least one subwoofer for reproducing audio signals at low frequencies,wherein the control circuit comprises: (i) an input connector,(ii) a bass management circuit comprising a first filter for pre-filtering audio signals for the at least one subwoofer and a second filter for pre-filtering audio signals for the at least one loudspeaker, and(iii) an output with a first output connector for the at least one subwoofer and with a second output connector for the at least one loudspeaker,wherein the first filter comprises a low-pass with a first amplitude response,wherein the at least one loudspeaker comprises a high-pass filter with a second amplitude response, and wherein there is a transition frequency range of the amplitude responses of the first filter and the high-pass filter in which both, the first filter and the high-pass filter, modify the audio signals by amplifying or attenuating,wherein the second filter comprises at least one parametric filter adapted for flattening a resulting amplitude response in the transition frequency range,and wherein a resulting amplitude response of the audio system, without usage of the second filter, has a waviness of at least ±1 dBSPL in the transition frequency range, and with usage of the second filter has a waviness of less than ±1 dBSPL in the transition frequency range.
  • 16. A control circuit for an audio system, comprising (a) an input connector,(b) a bass management circuit comprising a first filter for pre-filtering audio signals for at least one subwoofer and a second filter for pre-filtering audio signals for at least one loudspeaker, and(c) an output with a first output connector for the at least one subwoofer and with a second output connector for the at least one loudspeaker,wherein the first filter comprises a low-pass with a first amplitude response, and wherein the at least one loudspeaker comprises a high-pass filter with a second amplitude response, wherein there is a transition frequency range of the first amplitude response of the first filter and the second amplitude response of the high-pass filter in which both, the first filter and the high-pass filter, modify the audio signals by attenuating or amplifying,wherein the second filter comprises at least one parametric filter that is adapted at least to the second amplitude response of the high-pass filter and that flattens a resulting amplitude response in the transition frequency range,and wherein the second filter has an amplitude response that is substantially transparent at a frequency where the first amplitude response has a maximum.
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