| 摘要 |
PURPOSE:To enjoy a music in a sound field, adapted to the liking of a listener by arranging a standard microphone in the neighborhood of the listener, and inserting an adaptive filter which flattens the transfer function from a speaker amplifier input up to a standard microphone output. CONSTITUTION:The output of a tape recorder 1 is converted into a digital signal by an A/D converter 4, and given desired sound effect, which is previously set, by a digital filter 5, and emitted through the adaptive filter 6, a D/A converter 7, an amplifier 2 and a speaker 3. In such a case, the standard microphone 10 is previously arranged in the neighborhood of the listener, and an actual heard sound output is amplified by the amplifier 11, and a difference output between the output, converted into the digital signal by the A/D converter 12, and the output of the digital filter 5 is calculated, and the adaptive filter 6 is controlled by this difference output, and the transfer function between the speaker 3 and the listener is corrected so as to be an adapted state. Thus, the listener can enjoy music in the sound field, adapted to his liking. |
