Sound control apparatus for vehicles and method of controlling the same
A sound control apparatus for a vehicle is capable of implementing a separated sound zone in response to a change in position of a passenger's head. A separated sound zone control method for a vehicle includes determining a current position of the passenger's head, and when the determined current head position corresponds to a predicted head position, outputting an output sound datum corresponding to the predicted head position through a plurality of speakers, where the output sound datum is selected by applying a sound data sample to a control filter set configured to form a separated sound zone corresponding to the predicted head position.
1. A separated sound zone control method for a vehicle, the separated sound zone control method comprising the steps of:
determining a current position of a head of a passenger;
determining a first predicted head position based on the current position; and
determining a first output sound datum according to the first predicted head position,
wherein determining the first output sound datum comprises, when the determined current head position corresponds to a second predicted head position determined previously, outputting a second output sound datum determined according to the second predicted head position through a plurality of speakers, and
wherein the first output sound datum is selected by applying a sound data sample to a control filter set configured to form a separated sound zone corresponding to the first predicted head position.
2. The separated sound zone control method according to claim 1 , further comprising carrying out a prediction step to determine the first predicted head position.
3. The separated sound zone control method according to claim 2 , wherein the prediction step comprises:
calculating an average speed vector for the head of the passenger;
determining at least one control zone overlapping the average speed vector among a plurality of control zones; and
determining a predetermined number of control zones, among the at least one control zone overlapping the average speed vector, to be the current head position.
4. The separated sound zone control method according to claim 3 , wherein the step of determining the predetermined number of control zones comprises:
determining a priority score for each of the at least one control zone overlapping the average speed vector; and
determining the predetermined number of control zones to be the current head position in order of high to low priority scores.
5. The separated sound zone control method according to claim 4 , wherein the step of determining the priority score is performed for each of the at least one control zone overlapping the average speed vector based on a distance from the determined current head position and an overlapping length of the average speed vector.
6. The separated sound zone control method according to claim 2 , further comprising generating the first output sound datum in advance for the first predicted head position using a relevant control filter set and a sound data sample.
7. The separated sound zone control method according to claim 6 , wherein the step of generating the first output sound datum in advance is comprises generating a plurality of output sound data simultaneously for a plurality of predicted head positions through parallel calculation.
8. The separated sound zone control method according to claim 1 , further comprising, when the determined current head position does not correspond to the second predicted head position, selecting a control filter set corresponding to the current head position and generating the first output sound datum.
9. The separated sound zone control method according to claim 1 , wherein:
the plurality of speakers is disposed at different positions of the vehicle,
the control filter set comprises a control filter for each of the plurality of speakers disposed at the different positions, and
the first output sound datum comprises an output sound for each of the plurality of speakers disposed at the different positions.
10. A non-transitory computer-readable recording medium containing a program for performing the separated sound zone control method according to claim 1 .
11. A sound control apparatus for a vehicle that implements a separated sound zone, the sound control apparatus comprising:
a control unit configured to generate an output sound datum for implementing a separated sound zone based on a position of a head of a passenger; and
a plurality of speakers configured to output a sound corresponding to the output sound datum generated by the control unit,
wherein the control unit comprises:
a position determination unit configured to determine a current position of the head of the passenger, a first predicted head position based on the current position, and a first output sound datum according to the first predicted head position; and
an output controller configured to, when the determined current head position corresponds to a second predicted head position determined previously, output a second output sound datum according to the second predicted head position, and
the first output sound datum is selected by applying a sound data sample to a control filter set configured to form a separated sound zone corresponding to the first predicted head position.
12. The sound control apparatus according to claim 11 , wherein the position determination unit determines the first predicted head position of the passenger.
13. The sound control apparatus according to claim 12 , wherein the position determination unit calculates an average speed vector for the head of the passenger, determines at least one control zone overlapping the average speed vector among a plurality of control zones, and determines a predetermined number of control zones, among the at least one control zone overlapping the average speed vector, to be the current head position.
14. The sound control apparatus according to claim 13 , wherein the position determination unit determines a priority score for each of the at least one control zone overlapping the average speed vector and determines the predetermined number of control zones to be the current head position in order of high to low priority scores.
15. The sound control apparatus according to claim 14 , wherein the position determination unit determines the priority score for each of the at least one control zone overlapping the average speed vector based on a distance from the determined current head position and an overlapping length of the average speed vector.
16. The sound control apparatus according to claim 12 , wherein the control unit further comprises an output sound calculation unit configured to calculate the first output sound datum in advance for the first predicted head position using a relevant control filter set and a sound data sample.
17. The sound control apparatus according to claim 16 , wherein the output sound calculation unit simultaneously calculates a plurality of output sound data for a plurality of predicted head positions through parallel calculation.
18. The sound control apparatus according to claim 16 , wherein when the determined current head position does not correspond to the second predicted head position, the output sound calculation unit selects a control filter set corresponding to the current head position and generates the first output sound datum.
19. The sound control apparatus according to claim 11 , wherein:
the plurality of speakers is disposed at different positions of a vehicle,
the control filter set comprises a control filter for each of the plurality of speakers disposed at the different positions, and
the first output sound datum comprises an output sound for each of the plurality of speakers disposed at the different positions.