| 摘要 |
PROBLEM TO BE SOLVED: To generate a soft sound in place of high electronic ring back tone without working anything to a portable telephone or the like by receiving the radio wave of mobile telephone under reception or communication at an antenna and generating the sound stored in a storage circuit for sound generation from a speaker. SOLUTION: The radio wave for communication generated during reception or communication by the mobile telephone such as portable telephone is caught by an antenna 1 of a sound generating device for mobile telephone, rectified by a high frequency rectifier 2 and discriminated by a comparator 3. While receiving a signal from the comparator 3, a trigger pulse generating circuit 4 for sound generation generates a trigger pulse for sound generation for instructing start/stop of voice in various messages stored in a storage circuit 5 for sound generation. While receiving a signal from the trigger pulse generating circuit 4 for sound generation, the storage circuit 5 for sound generation sounds any arbitrary one of stored various messages from a speaker 6 through a power amplifier 5. |
