| 摘要 |
A system for controlling volume with a single knob includes: a knob ( 10 ) for generating rotation signals; a controlling apparatus ( 11 ) for determining a rotational direction and speed of each rotation signal, and generating corresponding volume controlling signals for adjusting volume according to the rotation signals; and an audio amplifier ( 12 ) for adjusting volume according to the volume controlling signals. The knob includes a rotational operation part ( 100 ) and a rotation signal generating circuit ( 101 ). The controlling apparatus includes a number of input ports ( 110 ), a timer ( 111 ), a counter ( 112 ), a ROM (Read Only Memory) ( 113 ), a RAM (Random Access Memory) ( 114 ), a CPU (Central Processing Unit) ( 115 ), a PWM (Pulse Width Modulator) ( 116 ), and a number of output ports ( 117 ). A related method for controlling volume with a single knob is also disclosed.
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