| CPC H04R 1/1083 (2013.01) [G10K 11/17821 (2018.01); G10K 11/17823 (2018.01); G10K 11/17827 (2018.01); G10K 11/1783 (2018.01); G10K 11/17854 (2018.01); G10K 11/17857 (2018.01); G10K 11/17873 (2018.01); G10K 11/17875 (2018.01); G10K 11/17885 (2018.01); H04R 1/1041 (2013.01); G10K 2210/1081 (2013.01); G10K 2210/3014 (2013.01); G10K 2210/3016 (2013.01); H04R 2430/03 (2013.01)] | 13 Claims |

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1. A signal processing apparatus, comprising:
a surrounding sound signal acquisition unit configured to collect a surrounding sound to generate a surrounding sound signal;
a surrounding sound level detector configured to:
divide the surrounding sound signal into a plurality of signals at a plurality of frequency bands; and
detect a level of each signal of the plurality of signals;
a noise canceling signal generation part configured to generate produce a noise canceling signal from the surrounding sound signal;
a cooped-up feeling elimination signal generation part configured to generate a cooped-up feeling elimination signal from the surrounding sound signal; and
an addition part configured to process the noise canceling signal and the cooped-up feeling elimination signal at a first ratio,
wherein the first ratio is based on the level of each signal of the plurality of signals.
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