The insects are small enough that they can get into small spaces and when the sun goes down, they will start to chirp.
In a later Twitter Tracker segment, a bird approaches with a bazooka and blows up the letters in an explosion worthy of a Schwarzenegger movie, and then finishes off with an innocuous chirp that even cracks up the host.
Later in the day we were driving around, and as we passed the old folks home I heard a chirp.
From the moment the crickets chirp in on the sublime " Summer's caldron ", the tone is set for a uplifting album.
Designs include linear phase filters, a wideband phase shifter, and chirp filters with fractional bandwidths exceeding 100% .