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root / utilities / temp.m @ 38:c2204b18f4a2
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| 1 | 38:c2204b18f4a2 | rmeddis | frequencies=[1000 1250]; |
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| 2 | amplitudesdB=[20 23]; |
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| 3 | nFrequencies=length(frequencies); |
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| 4 | |||
| 5 | dt=0.0001; |
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| 6 | |||
| 7 | toneDuration=.010; |
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| 8 | time=dt:dt:toneDuration; |
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| 9 | |||
| 10 | % fixed ramp, silenceDuration, toneDuration |
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| 11 | rampDuration=0.005; |
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| 12 | rampTime=dt:dt:rampDuration; |
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| 13 | ramp=[0.5*(1+cos(2*pi*rampTime/(2*rampDuration)+pi)) ... |
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| 14 | ones(1,length(time)-length(rampTime))]; |
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| 15 | ramp=ramp.*fliplr(ramp); |
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| 16 | |||
| 17 | silenceDuration=0.010; |
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| 18 | silenceDurationLength=round(silenceDuration/dt); |
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| 19 | initialSilence=zeros(1,silenceDurationLength); |
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| 20 | |||
| 21 | silenceToneDuration=toneDuration + silenceDuration; |
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| 22 | silenceToneDurationLength=round(silenceToneDuration/dt); |
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| 23 | |||
| 24 | totalDuration=silenceToneDuration*nFrequencies; |
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| 25 | totalDurationLength=round(totalDuration/dt); |
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| 26 | stimulus=zeros(1,totalDurationLength); |
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| 27 | toneBeginPTR=1; |
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| 28 | |||
| 29 | for i=1:nFrequencies |
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| 30 | frequency=frequencies(i); |
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| 31 | dBSPL=amplitudesdB(i); |
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| 32 | amplitude=28e-6* 10.^(dBSPL/20); |
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| 33 | tone=amplitude*sin(2*pi*frequency*time); |
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| 34 | tone=tone.*ramp; |
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| 35 | stimulus(toneBeginPTR:toneBeginPTR+silenceToneDurationLength-1)=... |
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| 36 | [initialSilence tone]; |
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| 37 | toneBeginPTR=toneBeginPTR+silenceToneDurationLength; |
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| 38 | end |
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| 39 | figure(2), plot( stimulus') |