| 摘要 |
<p>A sound reproducing apparatus is provided with an audio signal processing circuit (30) for receiving an audio signal from a signal input circuit (10) and applying the same to a speaker or sound producer (24,25) through a variable resistor (19,20) which is adjusted to vary its effective resistance value by an actuator (21) operating in response to a drive signal so as to reproduce sound corresponding to the audio signal with a volume determined by the effective resistance value of the variable resistor, (19,20) a time control (42) for causing the audio signal processing circuit (30) to commence operation automatically at a preset time, a duration setting arrangement operative in response to a duration setting signal to store in a memory (43) data corresponding to a selected duration of operation of the actuator (21), and a controller (41) programmed to be operative, when the time control causes the commencement of operation of the audio signal processing circuit (30) at the preset time, to cause a signal generator (44) to apply a drive signal to the actuator (21) for the selected duration corresponding to the data stored in the memory (43) so as to determine the volume of sound from the speaker (24,25) at the end of such duration.</p> |
