| 摘要 |
PURPOSE:To suppress the loudness of multiplexed sounds from a loudspeaker to conceal the singing of a singer so as to eliminate annoyances to the neighbors, by utilizing. The fact that the loudness of the singing voice of the singer amplified through a microphone is not so loud. CONSTITUTION:When contacts D and D' of a change-over switch 16 are respectively connected with contacts B and B', the signal of a microphone cannot be listened from a loudspeaker after amplification, since outputs of heads 5 and 5' are mixed at a fixed rate by means of resistances 26 and 26' and tape reproduced signals are supplied to a tape mixing amplifier 8' through the contacts B and D, but microphone signals from a micro-volume 4 are not supplied to a microphone-tape mixing amplifier 10. When a headphone is connected with a headphone jack 13X under this condition, mixture of tape reproduced sounds and microphone amplified sounds, whose mixing rate is adjusted buy means of a sound multiplexing volume 7, can be listened. When the contacts D and D' of the switch 16 are respectively connected with contacts C and C', no sounds are produced from the loudspeaker, but sounds can be listened through the headphones under the same condition as before. |
