Patent ID: 8761408

Claim:
A signal processing apparatus comprising: one or more detection means disposed for detecting movement of a diaphragm of a speaker in correspondence with first to n-th feedback methods that are different feedback methods; analog-to-digital conversion means for converting one or more detection signals of an analog form acquired by the one or more detection means into a digital form; feedback signal generating means for generating feedback signals corresponding to the first to n-th feedback methods by using the one or more detection signals of the digital form acquired by the analog-to-digital conversion means; correction equalizer means for setting an equalizing characteristic to allow a sound reproduced by the speaker to have a target frequency characteristic by changing a frequency characteristic of an audio source signal of the digital form; synthesis means for combining the audio source signal of the digital form, from the correction equalizer means, to be output as a driving signal of the speaker with the feedback signals; feedback operation setting means for setting which of the first to n-th feedback methods in which a feedback operation up to combining the audio source signal with the feedback signal, which is performed by the synthesis means, is performed and which of the first to n-th feedback methods in which the feedback operation is not performed; and equalizing characteristic changing and setting means for changing the equalizing characteristic to be set by the correction equalizer means based on which of the first to n-th feedback methods is performed and which of the first to-nth feedback methods is not performed.