| 摘要 |
PURPOSE:To evade an adverse effect due to sound field control by providing a control part which prohibits the attachment of sound field by a processor when a multipass noise or fading occurs when a sound source selected by a head unit is FM broadcast. CONSTITUTION:The control part 3 sets defeat sound when a mode is set in a DSP mode at present when a DSP 2 is set in an ON mode and an FM mode and the state of presence of the multipass continues for 30 seconds. It means that the DSP is automatically turned off since the multipass occurs in the DSP mode. Meanwhile, when no state of presence of the multipass continues for 30 seconds, processing is set in DSP processing. This is because that the mode is automatically returned to the DSP mode when no multipass exists. Also, when no multipass exists, weak electric field decision is performed. Such decision is performed by fetching the output of an S meter after applying A/D conversion, and comparing it with a constant value, and when it is decided as a weak electric field, it is decided whether or not it continues for 30 seconds. Following processing is performed similarly as when the multipass exists. |
