| 摘要 |
A multi-track speech synthesizer comprises a plurality of volume control units, a plurality of signal transform units, a plurality of current switch units, a comparison unit and a current output unit. Each current switch units includes a pair of complementary outputs to send out a current with its zero point at zero, and the output terminals of the current switch units are directly coupled together to form two connected output terminals. The comparison unit compares the voltages of the connected output terminals and then sends out a control signal to control the current output unit. Under the control of the control signal, the current output unit sends out a current of push-pull type with direct connection. Due to the zero point of the current from the current switch unit at 0, the direct current component by the direct connection will not be accumulated, thereby reducing the power consumption in comparison with traditional DAC multi-track speech synthesizers with (wire OR) direct connection.
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