| 摘要 |
PURPOSE:To prevent the howling phenomenon from being generated, by disconnecting a loop so that a signal returned is eliminated before being inputted to a speaker with a signal processing at a field of relay broadcasting. CONSTITUTION:An input sound signal applied to an adaptive filter AF through its input terminal f1 from an input terminal t2 is approximated to the sound signal from an outgoing line 5 incoming to the input terminal t1 when the input sound signal is extracted from an output terminal f2. Then, when a signal from a microphone 2 at a field 1 of relay broadcasting is incorporated in the sound signal from the outgoing line 5, it approximates to the sound signal from the microphone 2 extracted from the output terminal f2. Thus, in subtracting the signal at the output terminal t2 of the adaptive filter AF from the signal at the input terminal t1, only the rest signal excluding the sound signal from the microphone 2 is extracted from an output terminal m3. |
