Signal processing device and signal processing method

A signal processing method, comprising:

• in a signal processing device:
• dividing an audio signal into a plurality of first signal bands,
• wherein each of the plurality of first signal bands corresponds to a respective second signal band of a plurality of second signal bands of a plurality of speakers of a multi-way speaker;
• and
• executing a wave front synthesis filter process on each of the plurality of first signal bands,
• wherein each of the processed plurality of first signal bands is supplied to the respective second signal band of the plurality of second signal bands, and
• wherein a first cut-off frequency, between the divided plurality of first signal bands, is same as a second cut-off frequency that is between the plurality of second signal bands of the multi-way speaker.

A non-transitory computer-readable medium having stored thereon, computer-executable instructions, which when executed by a signal processing device, cause the signal processing device to execute operations, the operations comprising:

• dividing an audio signal into a plurality of first signal bands,
• wherein each the plurality of first signal bands corresponds to a respective second signal band of a plurality of second signal bands of a plurality of speakers of a multi-way speaker;
• and
• executing a wave front synthesis filter process on each of the plurality of first signal bands,
• wherein each of the processed plurality of first signal bands is supplied to the respective second signal band of the plurality of second signal bands, and
• wherein a first cut-off frequency, between the divided plurality of first signal bands, is same as a second cut-off frequency that is between the plurality of second signal bands of the multi-way speaker.