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more reasonable noise

was increased too much in 713d53e8a

--- a/dnn/dump_data.c

+++ b/dnn/dump_data.c

@@ -233,7 +233,7 @@

     }

     if (count*FRAME_SIZE_5MS>=10000000 && one_pass_completed) break;

     if (training && ++gain_change_count > 2821) {

-      float tmp;

+      float tmp, tmp2;

       speech_gain = pow(10., (-20+(rand()%40))/20.);

       if (rand()%20==0) speech_gain *= .01;

       if (rand()%100==0) speech_gain = 0;

@@ -240,7 +240,8 @@

       gain_change_count = 0;

       rand_resp(a_sig, b_sig);

       tmp = (float)rand()/RAND_MAX;

-      noise_std = 10*tmp*tmp;

+      tmp2 = (float)rand()/RAND_MAX;

+      noise_std = -log(tmp)-log(tmp2);

     }

     biquad(x, mem_hp_x, x, b_hp, a_hp, FRAME_SIZE);

     biquad(x, mem_resp_x, x, b_sig, a_sig, FRAME_SIZE);

-- 

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