Control method, control system, and storage medium
In a control method of controlling a frequency response of a filter for processing an audio signal, the frequency response is defined by an amplitude characteristic and a phase characteristic. The control method includes: acquiring a target amplitude characteristic, a target phase characteristic, and a latency value; obtaining a first frequency response in accordance with the target amplitude characteristic and the target phase characteristic; obtaining a second frequency response by modifying the first frequency response so that a latency of the second frequency response satisfies the latency value; and obtaining a third frequency response to be set for the filter by correcting the second frequency response, the second frequency response being corrected so as to reduce a difference between (i) an amplitude characteristic of the second frequency response and (ii) the target amplitude characteristic.
1. A control method of controlling a frequency response of a filter for processing an audio signal,
the frequency response being defined by an amplitude characteristic and a phase characteristic,
the control method comprising:
acquiring a target amplitude characteristic, a target phase characteristic, and a latency value;
obtaining a first frequency response in accordance with the target amplitude characteristic and the target phase characteristic;
obtaining a second frequency response by modifying the first frequency response so that a latency of the second frequency response satisfies the latency value; and
obtaining a third frequency response to be set for the filter by correcting the second frequency response, the second frequency response being corrected so as to reduce a difference between (i) an amplitude characteristic of the second frequency response and (ii) the target amplitude characteristic.
2. The control method according to claim 1 , further comprising setting (i) the target amplitude characteristic in accordance with a user operation, (ii) the target phase characteristic in accordance with a user operation, or both (i) and (ii).
3. The control method according to claim 1 , further comprising determining a degree of the correction of the second frequency response based on a priority.
4. The control method according to claim 3 , further comprising setting the priority in accordance with a user operation.
5. The control method according to claim 4 ,
wherein, in a case where the priority is changed so as to prioritize the amplitude characteristic over the phase characteristic, a difference between an amplitude characteristic of the third frequency response and the target amplitude characteristic becomes smaller, and
wherein, in a case where the priority is changed so as to prioritize the phase characteristic over the amplitude characteristic, a difference between a phase characteristic of the third frequency response and the target phase characteristic becomes smaller.
6. The control method according to claim 3 , wherein the priority is independently settable for a plurality of frequency bands of the audio signal.
7. The control method according to claim 1 , further comprising setting the latency value in accordance with a user operation.
8. The control method according to claim 1 , further comprising displaying (i) an amplitude characteristic of the third frequency response and the target amplitude characteristic in a comparable manner, (ii) a phase characteristic of the third frequency response and the target phase characteristic in a comparable manner, or both (i) and (ii).
9. A control system for controlling a frequency response of a filter for processing an audio signal, the control system comprising:
one or more processors; and
one or more memories,
wherein the frequency response is defined by an amplitude characteristic and a phase characteristic, and
wherein the one or more processors are configured to execute a program stored in the one or more memories to cause the control system to:
acquire a target amplitude characteristic, a target phase characteristic, and a latency value;
obtain a first frequency response in accordance with the target amplitude characteristic and the target phase characteristic;
obtain a second frequency response by modifying the first frequency response so that a latency of the second frequency response satisfies the latency value; and
obtain a third frequency response to be set for the filter by correcting the second frequency response, the second frequency response being corrected by reducing a difference between (i) an amplitude characteristic of the second frequency response and (ii) the target amplitude characteristic.
10. A non-transitory storage medium, comprising one or more storage media having stored thereon a computer-readable program for controlling a frequency response of a filter for processing an audio signal,
wherein the frequency response is defined by an amplitude characteristic and a phase characteristic, and
wherein the computer-readable program causes one or more processors to perform operations of:
acquiring a target amplitude characteristic, a target phase characteristic, and a latency value;
obtaining a first frequency response in accordance with the target amplitude characteristic and the target phase characteristic;
obtaining a second frequency response by modifying the first frequency response so that a latency of the second frequency response satisfies the latency value; and
obtaining a third frequency response to be set for the filter by correcting the second frequency response, the second frequency response being corrected by reducing a difference between (i) an amplitude characteristic of the second frequency response and (ii) the target amplitude characteristic.