ONBOARD TYPE SOUND SOURCE APPROACH INFORMING DEVICE

摘要

PURPOSE:To know data of necessary sound outboard of a vehicle even though acoustic equipment is operated while all vehicle windows are closed, by discriminating sound whether or not it comes from a sound source of the kind which is previously registered when the sound source approaches, thereby sound outboard of the vehicle is reproduced so that it may be heard in the vehicle. CONSTITUTION:There is provided a sound-electric converter 1 for converting sound outboard of a vehicle into an electrical signal, and the characteristic of an output signal is extracted by band-pass filters 2. Further, there is provided a memory circuit 5 for storing therein the characteristic of each of various kinds of sound sources, as to the frequency distributions of intensity of the sound generated from several kinds of sound sources to be informed, and the time variations thereof. Further, a discriminating circuit 6 compares the characteristics of the sound sources stored in the circuit 5 with output signals from the filters 2, and therefore, discriminates whether the sound comes from a sound source which is one of the kind of sounds to be informed or not. Further, a switch is a reproducing circuit 7 is opened and closed under control in accordance with an output signal from then discriminating circuit 6, and therefore, the sound outboard of the vehicle is reproduced when the sound source approaches, and is transmitted into the vehicle by means of a speaker 8.