That made for good music and that's what the amplifier had been built for.
So Bronson went home determined to build a series of sharp filters. First he would curtail the band-width of the amplifier until it peaked around eight hundred cycles per second, near the musical note 'A' one octave above the standard Concert Pitch 'A'.
Then he would build a set of sharply-tuned filters that would cut 'holes' in the remaining spectrum where the tonal interferences came. It would make her speech less natural but far more intelligible.
Bronson needed more evidence before he did anything serious about it.
It was nearing five o'clock in the morning before he finished his job, and started to listen once more.
CHAPTER II
The Red Sky
The girl turned from the window, where the bright sky silhouetted her slender figure.
"How do I know where he is?" she snapped.