Audio signal processor

An audio signal processor comprising:

• a harmonic signal generator configured to generate a harmonic signal that includes a signal generated by frequency scaling components of a target audio signal by a factor of k (k is an integer equal to or more than 2), the target audio signal being an audio signal to be processed;
• a left harmonic signal generator configured to generate a left harmonic signal by adjusting a gain of the harmonic signal in accordance with a direction of a target localization position of the target audio signal, such that the gain increases as the direction shifts leftward;
• a right harmonic signal generator configured to generate a right harmonic signal by adjusting a gain of the harmonic signal in accordance with the direction of the target localization position of the target audio signal, such that the gain increases as the direction shifts rightward;
• a left audio signal generator configured to generate a left audio signal by convolving a head-related transfer function from the target localization position to a left ear of a listener with the target audio signal;
• a right audio signal generator configured to generate a right audio signal by convolving a head-related transfer function from the target localization position to a right ear of the listener with the target audio signal;
• a left synthesizer configured to generate a left channel audio signal by synthesizing the left audio signal and the left harmonic signal;
• and
• a right synthesizer configured to generate a right channel audio signal by synthesizing the right audio signal and the right harmonic signal.

An audio signal processor comprising:

• a harmonic signal generator configured to generate a harmonic signal that includes a signal generated by frequency scaling components of a target audio signal by a factor of k (k is an integer equal to or more than 2), the target audio signal being an audio signal to be processed;
• a harmonic additional signal synthesizer configured to generate a harmonic additional signal by synthesizing the target audio signal and the harmonic signal;
• a left channel audio signal generator configured to generate an audio signal of a left channel by convolving a head-related transfer function from a target localization position of the target audio signal to a left ear of a listener with the harmonic additional signal;
• and
• a right channel audio signal generator configured to generate an audio signal of a right channel by convolving a head-related transfer function from the target localization position of the target audio signal to a right ear of the listener with the harmonic additional signal.

An audio signal processor comprising:

• a left harmonic signal generator configured to generate a left harmonic signal generated by frequency scaling components of a target left channel signal by a factor of k (k is an integer equal to or more than 2), the target left channel signal being a left channel signal of a target audio signal including left and right channels to be processed;
• a right harmonic signal generator configured to generate a right harmonic signal generated by frequency scaling components of a target right channel signal by a factor of L (L is an integer equal to or more than 2), the target right channel signal being the right signal of the target audio signal;
• a left audio signal generator configured to generate a left audio signal by convolving a head-related transfer function from a target localization position of the target audio signal to a left ear of a listener with the target left channel signal;
• a right audio signal generator configured to generate a right audio signal by convolving a head-related transfer function from the target localization position to a right ear of the listener with the target right channel signal;
• a left synthesizer configured to generate a left channel audio signal by synthesizing the left audio signal and the left harmonic signal;
• and
• a right synthesizer configured to generate a right channel audio signal by synthesizing the right audio signal and the right harmonic signal.

An audio signal processor comprising:

• a left harmonic signal generator configured to generate a left harmonic signal generated by frequency scaling components of a target left channel signal by a factor of k (k is an integer equal to or more than 2), the target left channel signal being a left channel signal of a target audio signal including left and right channels to be processed;
• a right harmonic signal generator configured to generate a right harmonic signal generated by frequency scaling components of a target right channel signal by a factor of L (L is an integer equal to or more than 2), the target right channel signal being the right signal of the target audio signal;
• a left harmonic additional signal synthesizer configured to generate a left harmonic additional signal by synthesizing the target left channel signal and the left harmonic signal;
• a right harmonic additional signal synthesizer configured to generate a right harmonic additional signal by synthesizing the target right channel signal and the right harmonic signal;
• a left channel audio signal generator configured to generate a left channel audio signal by convolving a head-related transfer function from a target localization position of the target audio signal to a left ear of a listener with the left harmonic additional signal;
• and
• a right channel audio signal generator configured to generate a right channel audio signal by convolving a head-related transfer function from the target localization position to a right ear of the listener with the right harmonic additional signal.