| 摘要 |
PURPOSE:To obtain a distortionless reproduced sound, by using speaker units having the same conversion efficiency for respective bits and weighting signals for respective bits which drive these speaker units. CONSTITUTION:Signals obtained from operational amplifiers OP1-OP8 are inputted to weighting amplifiers AMP1-AMP8 respectively. Weighting amplifiers AMP1-AMP8 are set to three states -Vn, 0, and +Vn in accordance with -1, 0, and 1 of input signals. Values of Vn in amplifiers AMP1-AMP8 correspond to weights of respective bits, and in case of 8 bits, voltages (x), 2x, 4x, 8x, 16x, 32x, 64x, and 128x (x is the weight for the first bit and is 1 in this example) are set. Thus, outputs of amplifiers AMP1-AMP8 become signals having voltages and signs corresponding to weights of respective bits. |
