C$B8@8l$K$h$k(B Linux $B%5%&%s%I%W%m%0%i%_%s%0(B

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Linux $B$K$*$$$F!"%5%&%s%I%+!<%I$r@)8f$9$k%I%i%$%P%=%U%H%&%'%"$H$7$F!":G(B $B$b0lHLE*$J$N$O!"(BKernel $B$KIUB0$9$k(B OSS/Free (Open Sound System Free) $B$G(B $B$"$k!#$3$N%5%&%s%I%I%i%$%P%=%U%H$r(B C$B8@8l$rMQ$$$F@)8f$9$k%W%m%0%i%`$r:n(B $B$k$3$H$K$h$C$F!"$4$/4JC1$J2;>pJs=hM}%W%m%0%i%_%s%0$K$D$$$F3X$V!#(B

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$B!V(BLinux$B%^%k%A%a%G%#%"%,%$%I!W!"(B Jeff Tranter $BCx(B $B;37A(B $B9@@8(B $BLu!"%*%i%$%j!<%8%c%Q%s=PHG(B

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Programmer's Guide to OSS

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$B%5%s%W%k%W%m%0%i%`(B

parrot.c p.212 $BNc(B14-2

dsp_info.c p.234 $BNc(B14-6

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  1. $BL58B$KO?2;$H:F@8$r7+$jJV$9;EMM$r$d$a$F!"#12s$@$1O?2;$H:F@8$r9T$J$&$h$&$K$;$h(B
  2. $B:F@8$HF1;~$K%U%!%$%k$K%P%$%J%j7A<0$K$F!V(Bparrot_1.raw$B!W$H$$$&%U%!%$%kL>$K$FJ]B8$9$k$h$&$K$;$h!#(B
  3. $B%P%$%J%j7A<0$GJ]B8$7$?%G!<%?$r(B
    sox -r 22050 -ub parrot_1.2raw parrot_12wav
    $B$H$7$F!"(Bwav$B%U%!%$%k$KJQ49$7!"(BWindowsNT$B>e$+$i(BCoolEdit$B$r;H$C$FFI$_9~$s$G$_$h(B
  4. $B:F@8$HF1;~$K%U%!%$%k$K%"%9%-!<7A<0$K$F!V(Bparrot_4.txt$B!W$H$$$&%U%!%$%kL>$K$FJ]B8$9$k$h$&$K$;$h!#(B
  5. $B%"%9%-!<7A<0$GJ]B8$5$l$?%G!<%?$r(B gnuplot $B$r;H$C$F2hLL$K%W%m%C%H$;$h(B
  6. $BO?2;;~$N%5%s%W%j%s%0<~GH?t$r(B 22050Hz $B$K$;$h(B
  7. $BO?2;;~4V$r(B5$BIC$KJQ99$K$;$h(B
  8. $BO?2;;~4V$r%3%^%s%I%i%$%s$+$iIC$NC10L$G;XDj$7!"(Bbuf $B$r(Bmalloc$B$r;H$C$FF0E*$K3NJ]$;$h(B
  9. $BO?2;;~$K%9%F%l%*O?2;$9$k$h$&$KJQ99$;$h(B
  10. $B2DG=$J$iO?2;;~$K(B16bit$BNL;R2=$r9T$J$&$h$&$KJQ99$;$h(B
  11. $B:F@8;~$N%5%s%W%j%s%0<~GH?t$rO?2;;~$N(B1/2$B$K$9$k$H!"$I$N$h$&$J2;$,:F@8$5$l$k$+!)(B
  12. $BO?2;;~$N%5%s%W%j%s%0<~GH?t$r(B22050Hz$B$H$7!":F@8;~$N%5%s%W%j%s%0<~GH?t$r(B32000Hz$B$H$9$k$H!"$I$N$h$&$J2;$,:F@8$5$l$k$+!)(B
  13. $B%9%F%l%*O?2;$7$?%G!<%?$r:81&%A%c%s%M%k$rB-$79g$o$;$F!"#1%A%c%s%M%k$K$7!"%b%N%i%k$G:F@8$9$k$h$&$KJQ99$;$h!#$^$?!"?6I}$,%*!<%P!<%U%m!<$7$J$$;EAH$_$r2?$+9M$($h!#(B
  14. $BO?2;$7$?%G!<%?$r0l$DCV$-$K4V0z$-$7$F:F@8$9$k$H!"$I$N$h$&$J2;$,:F@8$5$l$k$+!)(B
  15. $B%G!<%?$N4V0z$-$r9T$J$&<!$N$h$&$J;EMM$N4X?t$r:n@.$7!">e5-%W%m%0%i%`$r=q$-49$($h!#(B
    void thin_out(unsigned char inbuf[], unsigned char outbuf[], int n, int rate)
/*
	inbuf[] : $BF~NO?.9f(B	(8bit)
	outbuf[] : $B=PNO?.9f(B	(8bit)
	n       : $BF~NO?.9f$ND9$5(B
	rate    : $B4V0z$-?t(B (2$B$@$H(B2$B$D$K(B1$B$D$r4V0z$/(B)
*/
  16. $BO?2;$7$?%G!<%?$K$D$-!"F1$8%G!<%?$r#1$D$E$DFbA^$7$F!"G\$ND9$5$K$9$k$H!"$I$N$h$&$J2;$,:F@8$5$l$k$+!)(B
  17. $B%G!<%?$NFbA^$r9T$J$&<!$N$h$&$J;EMM$N4X?t$r:n@.$7!">e5-%W%m%0%i%`$r=q$-49$($h!#(B
    void interp(unsigned char inbuf[], unsigned char outbuf[], int n, int rate)
/*
	inbuf[] : $BF~NO?.9f(B	(8bit)
	outbuf[] : $B=PNO?.9f(B	(8bit)
	n       : $BF~NO?.9f$ND9$5(B
	rate    : $BFbA^?t(B (2$B$@$H(B1$B%G!<%?$K$D$-(B1$B$DF1$8%G!<%?$rFbA^!"(B3$B$@$H(B2$B$DF1$8%G!<%?$rFbA^(B)
*/
  18. $BFbA^$9$k%G!<%?$,!"A08e$N?6I}CM$rD>@~Jd4V$7$?CM$H$J$k$h$&$K>e5-%W%m%0%i%`$r=q$-49$($h!#:F@8$5$l$k2;$N2;e5-%W%m%0%i%`$H$I$N$h$&$K0[$J$k$+!)(B
  19. $BO?2;$r$d$a$F!"(B1000Hz$B$N=c2;$r(B5$BIC4V9g@.$7!"$=$l$r:F@8$9$k$h$&$K%W%m%0%i%`$rJQ99$;$h!#(B
  20. $B=c2;$N<~GH?t$H?6I}CM$r%3%^%s%I%i%$%s$h$jM?$($k$h$&$K$;$h(B
  21. $B=c2;$r9g@.$9$k4X?t$r0J2<$N;EMM$G:n@.$7!"$=$N4X?t$r;H$&$h$&%W%m%0%i%`$r=q$-49$($h(B
    void sine_tone(unsigned char outbuf[], float f, int amp, int n)
/*
	outbuf[]	: $B=c2;=PNO?.9f(B	(8bit)
	f		: $B<~GH?t(B [Hz]
	amp		: $B?6I}(B
	n		: $B=PNO?.9f$ND9$5(B
*/
  22. $B4X?t(B sine_tone $B$rMxMQ$7$F!"4pK\2;$+$iBh(B10$BG\2;$^$G$rEy?6I}$G4^$`D4(B $BGHJ#9g2;$r9g@.$7$F:F@8$;$h!#?6I}$,%*!<%P!<%U%m!<$7$J$$;EAH$_$r2?$+9M$((B $B$h(B
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