US Patent 7825779 Remote entry chirp sound reduction method and system

A vehicle remote entry locking or unlocking chirp sound reduction system including a remote transmitter operable to transmit a signal, a receiver operable to receive the signal from the remote transmitter, a controller operably connected to the receiver and being operable in response to the signal from the remote transmitter, and a horn operably connected to the controller. The controller may be configured to cause the horn to generate an audible signal having a predetermined pulse duration which depends on at least one characteristic of a vehicle prior to or during actuation of the remote transmitter. Also provided is a method of reducing the sound of an audible signal generated by actuation of a vehicle remote entry system.