根据人声及鸟声频率的不同，将两种声音分离出来。-talk_sound.wav is a mono (1-channel) 44,100 samples per sec, 16-bit per sample WAV file.

Write a Matlab program to separate the voice from the background sounds and to separate the background sounds from the voice. The voice occupies mainly 900 Hz and below, the background sound is both noise and bird chirps that tend to be within 1000-1400 Hz.

Write out the separated voice and the separated background to separate wav files titled voice.wav and background.wav.