Apparatus and method for generating a first control signal and a second control signal by using a linearization and/or a bandwidth extension

Apparatus for generating a first control signal for a first transducer and a second control signal for a second transducer, comprising:

• an input interface for providing a first audio signal for a first audio channel and a second audio signal for a second audio channel;
• a signal combiner for determining from the first audio signal and the second audio signal a combination signal comprising an approximate difference of the first audio signal and the second audio signal;
• a signal manipulator for manipulating the combination signal to acquire the second control signal;
• and
• an output interface for outputting or storing the first control signal based on the first audio signal, or the second control signal,
• wherein the signal combiner is configured to subtract the second audio signal from the first audio signal in the time domain to acquire the combination signal,
• wherein the signal manipulator comprises:
• a delay stage configured to delay the combination signal,
• a linearization filter configured to amplify or attenuate the combination signal in a frequency-selective manner to at least partially linearize the non-linear transducer characteristic over frequency of the second transducer, and
• an attenuation member to attenuate a level of the combination signal, and
• wherein the output interface comprises a bandwidth extension stage to convert at least a part of a spectrum of the first audio signal in a frequency range above 20 kHz using an amplification factor greater than or equal to 1 to acquire the first control signal comprising the frequency range above 20 kHz.

Apparatus for generating a first control signal for a first transducer and a second control signal for a second transducer, comprising:

• an input interface for providing a first audio signal for a first audio channel and a second audio signal for a second audio channel;
• a signal combiner for determining from the first audio signal and the second audio signal a combination signal comprising an approximate difference of the first audio signal and the second audio signal;
• a signal manipulator for manipulating the combination signal to acquire the second control signal;
• and
• an output interface for outputting or storing the first control signal based on the first audio signal, or the second control signal,
• wherein the signal combiner is configured to subtract the first audio signal from the second audio signal in the time domain to acquire a further combination signal,
• wherein the signal manipulator is configured to manipulate the further combination signal to acquire a fourth control signal for a fourth transducer, and comprises:
• a delay stage configured to delay the further combination signal,
• a linearization filter to at least partially linearize a non-linear transducer characteristic over frequency of the fourth transducer, and
• an attenuation member to attenuate a level of the further combination signal, and
• wherein the output interface is configured to output or store a third control signal for a third transducer based on the second audio signal or the fourth control signal and comprises a bandwidth extension stage to convert at least a part of a spectrum of the second audio signal in a frequency range above 20 kHz using an amplification factor of greater than or equal to 1 to acquire the third control signal.

Apparatus for generating a first control signal for a first transducer and a second control signal for a second transducer, comprising:

• an input interface for providing a first audio signal for a first audio channel and a second audio signal for a second audio channel;
• a signal combiner for determining from the first audio signal and the second audio signal a combination signal comprising an approximate difference of the first audio signal and the second audio signal;
• a signal manipulator for manipulating the combination signal to acquire the second control signal;
• and
• an output interface for outputting or storing the first control signal based on the first audio signal, or the second control signal,
• wherein the signal manipulator is configured to delay the combination signal or to amplify or attenuate the combination signal in a frequency-selective manner to counteract a non-linear transducer characteristic over frequency of the second transducer,
• wherein the input interface is configured to acquire a first reception audio signal or a second reception audio signal, and
• wherein the input interface comprises a bandwidth extension stage to convert at least a part of a spectrum of the first reception audio signal or the second reception audio signal in a frequency range above 20 kHz using an amplification factor of greater than or equal to 1 to acquire the first audio signal or the second audio signal.

Apparatus for generating a first control signal for a first transducer and a second control signal for a second transducer, comprising:

• an input interface for providing a first audio signal for a first audio channel and a second audio signal for a second audio channel;
• a signal combiner for determining from the first audio signal and the second audio signal a combination signal comprising an approximate difference of the first audio signal and the second audio signal;
• a signal manipulator for manipulating the combination signal to acquire the second control signal;
• and
• an output interface for outputting or storing the first control signal based on the first audio signal, or the second control signal,
• wherein the signal manipulator is configured to delay the combination signal or to amplify or attenuate the combination signal in a frequency-selective manner to counteract a non-linear transducer characteristic over frequency of the second transducer, and
• wherein the signal manipulator comprises:
• a bandwidth extension stage to convert at least a part of a spectrum of the combination signal or a signal derived from the combination signal in a frequency range above 20 kHz using an amplification factor greater than or equal to one to acquire a manipulated signal the second control signal is based on.

Loudspeaker system, comprising:

• a first transducer, a second transducer, a third transducer, and a fourth transducer;
• and
• an apparatus for generating a first control signal for the first transducer and a second control signal for the second transducer, comprising:
• an input interface for providing a first audio signal for a first audio channel and a second audio signal for a second audio channel;
• a signal combiner for determining from the first audio signal and the second audio signal a combination signal comprising an approximate difference of the first audio signal and the second audio signal;
• a signal manipulator for manipulating the combination signal to acquire the second control signal;
• and
• an output interface for outputting or storing the first control signal based on the first audio signal, or the second control signal,
• wherein the signal manipulator is configured to delay the combination signal or to amplify or attenuate the combination signal in a frequency-selective manner to counteract a non-linear transducer characteristic over frequency of the second transducer, or wherein the apparatus is configured to convert at least a part of a spectrum of the first audio signal or the combination signal in a frequency range above 20 kHz to acquire the first control signal comprising the frequency range above 20 kHz,
• wherein the apparatus for generating is configured to:
• generate the first control signal for the first transducer by using the first audio signal,
• generate the second control signal for the second transducer by using the combination signal,
• generate a third control signal for the third transducer by using the second audio signal, and
• generate a fourth control signal for the fourth transducer by using a further combination signal,
• wherein the first transducer and the third transducer are configured to generate a translational sound signal, and
• wherein the second transducer and the fourth transducer are configured to generate a rotatory sound signal.

Method for generating a first control signal for a first transducer and a second control signal for a second transducer, comprising:

• providing a first audio signal for a first audio channel and a second audio signal for a second audio channel;
• determining from the first audio signal and the second audio signal a combination signal comprising an approximate difference of the first audio signal and the second audio signal;
• manipulating the combination signal to acquire the second control signal;
• and
• outputting or storing the first control signal based on the first audio signal, or the second control signal,
• wherein the manipulating comprises delaying the combination signal or amplifying or attenuating the combination signal in a frequency-selective manner to counteract a non-linear transducer characteristic over frequency of the second transducer, and
• wherein the outputting or storing comprises converting at least a part of a spectrum of the first audio signal or the combination signal in a frequency range above 20 kHz using an amplification factor of greater than or equal to 1 to acquire the first control signal comprising the frequency range above 20 kHz,
• or
• wherein the determining comprises subtracting the second audio signal from the first audio signal in the time domain to acquire the combination signal,
• wherein the manipulating comprises:
• delaying the combination signal,
• amplifying or attenuating the combination signal in a frequency-selective manner to at least partially linearize the non-linear transducer characteristic over frequency of the second transducer, and
• attenuating a level of the combination signal, and
• wherein the outputting or storing comprises converting at least a part of a spectrum of the first audio signal in a frequency range above 20 kHz using an amplification factor greater than or equal to 1 to acquire the first control signal comprising the frequency range above 20 kHz,
• or
• wherein the determining comprises subtracting the first audio signal from the second audio signal in the time domain to acquire a further combination signal, and
• wherein the manipulating comprises manipulating the further combination signal to acquire a fourth control signal for a fourth transducer, comprising:
• delaying the further combination signal,
• at least partially linearizing a non-linear transducer characteristic over frequency of the fourth transducer, and
• attenuating a level of the further combination signal, and
• wherein the outputting or storing comprises converting at least a part of a spectrum of the second audio signal in a frequency range above 20 kHz using an amplification factor of greater than or equal to 1 to acquire a third control signal for a third transducer, outputting or storing the third control signal, and outputting or storing the fourth control signal,
• or
• wherein the manipulating comprises delaying the combination signal or amplifying or attenuating the combination signal in a frequency-selective manner to counteract a non-linear transducer characteristic over frequency of the second transducer, wherein the input interface is configured to acquire a first reception audio signal or a second reception audio signal, and
• wherein the providing comprises converting at least a part of a spectrum of the first reception audio signal or the second reception audio signal in a frequency range above 20 kHz using an amplification factor of greater than or equal to 1 to acquire the first audio signal or the second audio signal,
• or
• wherein the manipulating comprises delaying the combination signal or amplifying or attenuating the combination signal in a frequency-selective manner to counteract a non-linear transducer characteristic over frequency of the second transducer, and
• wherein the manipulating comprises converting at least a part of a spectrum of the combination signal or a signal derived from the combination signal in a frequency range above 20 kHz using an amplification factor greater than or equal to one to acquire a manipulated signal the second control signal is based on.

A non-transitory digital storage medium having a computer program stored thereon to perform, when said computer program is run by a computer, the method for generating a first control signal for a first transducer and a second control signal for a second transducer, the method comprising:

• providing a first audio signal for a first audio channel and a second audio signal for a second audio channel;
• determining from the first audio signal and the second audio signal a combination signal comprising an approximate difference of the first audio signal and the second audio signal;
• manipulating the combination signal to acquire the second control signal;
• and
• outputting or storing the first control signal based on the first audio signal, or the second control signal,
• wherein the manipulating comprises delaying the combination signal or amplifying or attenuating the combination signal in a frequency-selective manner to counteract a non-linear transducer characteristic over frequency of the second transducer, and
• wherein the outputting or storing comprises converting at least a part of a spectrum of the first audio signal or the combination signal in a frequency range above 20 kHz using an amplification factor of greater than or equal to 1 to acquire the first control signal comprising the frequency range above 20 kHz,
• or
• wherein the determining comprises subtracting the second audio signal from the first audio signal in the time domain to acquire the combination signal,
• wherein the manipulating comprises:
• delaying the combination signal,
• amplifying or attenuating the combination signal in a frequency-selective manner to at least partially linearize the non-linear transducer characteristic over frequency of the second transducer, and
• attenuating a level of the combination signal, and
• wherein the outputting or storing comprises converting at least a part of a spectrum of the first audio signal in a frequency range above 20 kHz using an amplification factor greater than or equal to 1 to acquire the first control signal comprising the frequency range above 20 kHz,
• or
• wherein the determining comprises subtracting the first audio signal from the second audio signal in the time domain to acquire a further combination signal, and
• wherein the manipulating comprises manipulating the further combination signal to acquire a fourth control signal for a fourth transducer, comprising:
• delaying the further combination signal,
• at least partially linearizing a non-linear transducer characteristic over frequency of the fourth transducer, and
• attenuating a level of the further combination signal, and
• wherein the outputting or storing comprises converting at least a part of a spectrum of the second audio signal in a frequency range above 20 kHz using an amplification factor of greater than or equal to 1 to acquire a third control signal for a third transducer, outputting or storing the third control signal, and outputting or storing the fourth control signal,
• or
• wherein the manipulating comprises delaying the combination signal or amplifying or attenuating the combination signal in a frequency-selective manner to counteract a non-linear transducer characteristic over frequency of the second transducer, wherein the input interface is configured to acquire a first reception audio signal or a second reception audio signal, and
• wherein the providing comprises converting at least a part of a spectrum of the first reception audio signal or the second reception audio signal in a frequency range above 20 kHz using an amplification factor of greater than or equal to 1 to acquire the first audio signal or the second audio signal,
• or
• wherein the manipulating comprises delaying the combination signal or amplifying or attenuating the combination signal in a frequency-selective manner to counteract a non-linear transducer characteristic over frequency of the second transducer, and
• wherein the manipulating comprises converting at least a part of a spectrum of the combination signal or a signal derived from the combination signal in a frequency range above 20 kHz using an amplification factor greater than or equal to one to acquire a manipulated signal the second control signal is based on.