Signal processing device, signal processing method, and recording medium
View Patent ↗A signal processing device includes: an obtainer that obtains sound data; a pitch controller that controls pitch of the sound data obtained to increase the pitch by a factor of n (a real number greater than 1); an extractor that extracts frequency components of at least 20 kHz which are included in the sound data whose pitch is controlled; an adder that adds the frequency components extracted to the sound data obtained; and an outputter that outputs sound data to which the frequency components extracted are added.
1. A signal processing device, comprising:
an obtainer that obtains sound data;
a pitch controller that increases a pitch of the sound data as a whole by a factor of n, where n is a real number greater than 1;
an extractor that extracts frequency components of at least 20 kHz which are included in the sound data whose pitch is increased;
an adder that adds only the frequency components of at least 20 kHz which are extracted by the extractor to the sound data obtained by the obtainer; and
an outputter that outputs the sound data to which the frequency components of at least 20 kHz are added.
2. The signal processing device according to claim 1 , wherein
the pitch controller increases the pitch by a factor of an m th power of 2, where m is an integer of 1 or greater.
3. The signal processing device according to claim 1 , wherein
the extractor extracts frequency components of at least 40 kHz which are included in the sound data whose pitch is increased.
4. A signal processing method, comprising:
obtaining sound data,
increasing a pitch of the sound data as a whole by a factor of n, where n is a real number greater than 1;
extracting frequency components of at least 20 kHz which are included in the sound data whose pitch is increased;
adding only the frequency components of at least 20 kHz which are extracted in the extracting to the sound data; and
outputting the sound data to which the frequency components of at least 20 kHz are added in the adding.
5. A non-transitory computer-readable recording medium for use in a computer, the non-transitory computer-readable recording medium having a computer program recorded thereon for causing the computer to execute the signal processing method according to claim 4 .
6. A signal processing device, comprising:
a processor; and
a memory that stores a program that, when executed by the processor, causes the processor to:
obtain sound data;
increase a pitch of the sound data as a whole by a factor of n, where n is a real number greater than 1;
extract frequency components of at least 20 kHz which are included in the sound data whose pitch is increased;
add only the extracted frequency components of at least 20 kHz to the obtained sound data; and
output the sound data to which the frequency components of at least 20 kHz are added.
7. The signal processing device according to claim 6 , wherein
the processor increases the pitch by a factor of an m th power of 2, where m is an integer of 1 or greater.
8. The signal processing device according to claim 6 , wherein
the processor extracts frequency components of at least 40 kHz which are included in the sound data whose pitch is increased.