METHOD AND SYSTEM FOR COMMANDING THE PRODUCTION OF AN ACOUSTIC WAVEFORM BASED ON A PHYSIOLOGICAL CONTROL SIGNAL, AND ASSOCIATED COMPUTER PROGRAM
The method for commanding the production of an acoustic waveform based on a physiological control signal, includes: one provides sampled sound data including S sound samples stored on a data carrier; repeatedly, for n successive respective time intervals [t n ; t n+1 [ between an initial time t a and a final time t b : one provides a physiological control signal phi(t) as a function of time, during the current time interval [t n ; t n+1 [; a rate determination module of a processor determines a rate r n of samples to be played during that time interval based on a value phi (t n ) of the physiological control signal at time t n ; a command module of the processor commands the play of a part of the acoustic waveform from the sampled sound data as a function of the determined rate r n of samples.
1 . Method for commanding the production of an acoustic waveform based on a physiological control signal, comprising:
providing sampled sound data comprising S sound samples stored on a data carrier,
repeatedly, for n successive respective time intervals [t n ; t n+1 [ between an initial time t a and a final time t b :
providing a physiological control signal phi(t) as a function of time, during the current time interval [t n ; t n+1 [,
a rate determination module ( 13 ) of a processor determines a rate r n of samples to be played during that time interval based on a value phi (t n ) of the physiological control signal at time t n ,
a command module ( 15 ) of the processor commands the play of a part of the acoustic waveform from the sampled sound data as a function of the determined rate r n of samples.
2 . Method for commanding the production of an acoustic waveform according to claim 1 , wherein the physiological control signal phi (t) is representative of the phase of a pseudo-periodic physiological signal.
3 . Method for commanding the production of an acoustic waveform according to claim 2 , wherein the pseudo-periodic physiological signal is a respiratory signal or an electro-encephalogram signal of a user.
4 . Method for commanding the production of an acoustic waveform according to claim 1 , wherein the physiological control signal phi(t) is a strictly monotonous signal along time.
5 . Method for commanding the production of an acoustic waveform according to claim 1 , wherein the rate r n of samples to be played is proportional to a speed (R) of number of played samples per time, between the initial time t a and the final time t b .
6 . Method for commanding the production of an acoustic waveform according to claim 1 , wherein the rate r n of samples to be played is proportional to an inverse of d·phi(t)/dt, where an operator (d·X/dt) designates a time derivative of signal X.
7 . Method for commanding the production of an acoustic waveform according to claim 1 , wherein the command module ( 15 ) of the processor re-samples N sound samples of the sound data into P sound samples, where P is lower than N and r=P/N.
8 . Method for commanding the production of an acoustic waveform according to claim 1 wherein at least one time interval has a time duration δt=t n+1 −t n at most equal to 5% of t b −t a .
9 . Method for commanding the production of an acoustic waveform according to claim 1 , further comprising determining the physiological control signal phi(t) as a function of time based on a measurement by a sensor.
10 . Method for commanding the production of an acoustic waveform according to claim 1 , wherein the physiological control signal phi(t) is determined from a pseudo-periodic physiological signal of period t b −t a .
11 . Method for commanding the production of an acoustic waveform according to claim 1 , wherein the method is repeated for further periods of time until the sample sound data is played.
12 . Method for producing an acoustic waveform comprising:
applying a method for commanding the production of an acoustic waveform according to claim 1 ,
for each of said successive time intervals, playing a part of the acoustic waveform from the sampled sound data as a function of the determined rate r n of samples.
13 . Computer program comprising instructions for executing the steps of the methods according to claim 1 , when the computer program is run on a processor.
14 . System for commanding the production of an acoustic waveform based on a physiological control signal, comprising:
a data carrier storing sampled sound data comprising S sound samples,
a processor configured to repeatedly, for n successive respective time intervals [t n ; t n+1 [ between the initial time t a and the final time t b :
a physiological control signal phi(t) being provided as a function of time, during the current time interval [t n ; t n+1 [,
determine a rate r n of samples to be played during that time interval based on a value phi (t n ) of the physiological control signal at time t n , using a rate determination module ( 13 ) of the processor,
command the play of a part of the acoustic waveform from the sampled sound data as a function of the determined rate r n of samples, using a command module ( 15 ) of the processor.
15 . System for commanding the production of an acoustic waveform according to claim 14 further comprising a wearable device adapted to be worn on the head of a user, housing the processor and data carrier, and comprising sensors to determine the physiological control signal phi(t) as a function of time.
16 . The method of claim 8 , wherein all time intervals δt=t n+1 −t n are at most equal to 5% of t b −t a .
17 . The method of claim 8 , wherein at least one time interval δt=t n+1 −t n is at most equal to 0.1% of t b −t a .
18 . The method of claim 8 , wherein at least one time interval δt=t n+1 −t n is at most equal to 1% of t b −t a .
19 . The method of claim 8 , wherein at least one time interval δt=t n+1 −t n is at most equal to 5% of t b −t a .
20 . The method of claim 8 , wherein at least one time interval δt=t n+1 −t n is at most equal to 0.3% of t b −t a .