Sound field control system, analysis device, and acoustic device

1. A sound field control system comprising:

a signal supply configured to supply a test signal sequence to speakers; and

a mobile device configured to:

detect using a microphone a test sound sequence emitted from the speakers based on the test signal sequence, and

determine a pickup time of an initial test sound included in the detected test sound sequence comprising:

detecting the initial sound of the detected test sound sequence,

determining whether a sound has been detected after a sound emission interval of time has elapsed since the sound pickup time of the detected initial sound, wherein:

the sound emmission interval is a time period between the initial test sound and an n-th (where n is an integer such that n≥2) test sound defined by the test signal sequence, and

the n-th test sound is emitted from a same speaker as the initial test sound, and

upon determining that the sound has been detected, determining the sound pickup time of the initial sound as the sound pickup time of the initial test sound; and

wherein the signal supply is additionally configured to perform a delay process for a voice signal supplied to each of the speakers based on the determined pickup time of the initial test sound.

2. The sound field control system according to claim 1 , wherein the mobile device, upon determining that no sound has been detected after the elapse of the sound emission interval, from the sound pickup time of the detected initial sound, between the initial test sound and the n-th test sound, determines a sound detected next to the initial sound as new initial sound.

3. The sound field control system according to claim 2 , wherein the mobile device, with respect to the speaker which emits the initial test sound, determines whether a sound has been detected after the elapse of the sound emission interval, from the sound pickup time of the final test sound defined by the test signal sequence, between the final test sound and a preceding test sound, and, upon determining that the sound has been detected, determines the sound detected next to the initial sound as a new initial sound.

4. The sound field control system according to claim 3 , wherein:

the test signal sequence is configured to cause a plurality of the speakers to emit the test sound x times each (where x is an integer such that x≥2),

the mobile device is further configured to, with reference to the sound pickup time of the initial test sound, perform synchronous addition for each of the speakers, using at least some of sound pickup results of the test sound emitted x times; and

the signal supply performs the delay processing using the synchronous addition result.

5. The sound field control system according to claim 4 , wherein:

the mobile device is further configured to compare information indicating a sound emission timing of the test signal sequence with a sound pickup timing of each test sound that is obtained from the synchronous addition result and that has been subjected to synchronous addition for each of the speakers, to calculate a time difference between the sound emission timing and the sound pickup timing of each test sound,

wherein the signal supply performs the delay process based on the calculated time difference.

6. The sound field control system according to claim 5 , wherein the test signal sequence is a signal sequence for emitting the test sound at regular intervals.

7. The sound field control system according to claim 6 , wherein the mobile device, with reference to a point in time preceding the sound pickup time of the initial test sound by a predetermined time, calculates a time difference between a time length from a start point of each of divided intervals which are set at the regular intervals to the sound pickup time of each test sound and the predetermined time.

8. The sound field control system according to claim 5 ,

wherein the mobile device and the signal supply are connected via wireless communication.

9. An analysis device comprising a processor configured to:

detect using a microphone a test sound sequence emitted from speakers based on a test signal sequence; and

determine a pickup time of an initial test sound included in the test sound sequence comprising:

detecting the initial sound of the detected test sound sequence;

determining whether a sound has been detected after a sound emission interval of time has elapsed since the sound pickup time of the detected initial sound, wherein:

the sound emission interval is a time period between the initial test sound and an n-th (where n is an integer such that n≥2) test sound defined by the test signal sequence, and

the n-th test sound is emitted from a same speaker as the initial test sound; and

upon determining that the sound has been detected, determining the sound pickup time of the initial sound as the sound pickup time of the initial test sound; and

output a signal based on the determined pickup time of the initial test sound to be used for performing a delay process for a voice based supplied to each of the speakers.

10. An acoustic device configured to:

supply a test signal sequence to speakers; and

detect using a microphone a test sound sequence emitted from the speakers based on the test signal sequence;

determines a pickup time of an initial test sound included in the detected test sound sequence comprising:

determining whether a sound has been detected after a sound emission interval of time has elapsed since a sound pickup time of a detected initial sound, wherein:

the sound emission interval is a time period between the initial test sound and an n-th (where n is an integer such that n≥2) test sound defined by the test signal sequence, and

the n-th test sound is emitted from a same speaker as the initial test sound,

upon determining that the sound has been detected, determines the sound pickup time of the initial sound as the sound pickup time of the initial test sound, and

perform a delay process for a voice signal supplied to each of the sneakers based on the determined pickup time of the initial test sound.