ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,525,076, issued on Jan. 13, was assigned to TOYOTA JIDOSHA K.K. (Toyota, Japan).
"Communication device" was invented by Hiroaki Sakurai (Nagoya, Japan) and Kunito Takahashi (Hamamatsu, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A communication device includes a D/A converter that generates an audio signal that is output as audio from a speaker, and an A/D converter that generates an input audio signal from audio collected by a microphone. The communication device generates a diagnostic audio signal that is output as diagnostic audio at a frequency that is outside of human hearing range. When the diagnostic audio is output from the speaker, the...