To possess the balun which from the year horn antenna and television receiver

摘要

PROBLEM TO BE SOLVED: To secure ample receiver sensitivity to a frequency in a broad band, without requiring sensitivity adjustment, and to integrate an earphone and an antenna by enabling transmission of voice signals to the earphone.;SOLUTION: The earphone antenna is connected to the earphones 12L, 12R via loading coils LLa, LLb, LRa, LRb with a terminal at an opposite balun side of two pairs of signal lines for both voice and high frequency, 8La, 8Lb, 8Ra, 8Rb corresponding to the left and the right earphones 12L, 12R connected to a balun 4. The loading coils LLa, LLb, LRa, LRb become a low impedance at the fundamental frequency (for example, 100 MHz), and become a high impedance at a specific frequency higher than that (for example, 200 MHz) to shield at a high frequency. Further, the two pairs of signal lines for both voice and high frequency 8La, 8Lb, 8Ra, 8Rb are made to function as a transmission means of voice signals to the left and right earphones 12L, 12R.;COPYRIGHT: (C)2007,JPO&INPIT