Patent ID: 6940439
Filing Date: 2005-09-06
Classification: G10L

Abstract:
1. A multi-track speech synthesizer comprising: a plurality of signal transform units each for receiving a series of digital speech codes and converting them to an analog speech signal with a zero point at zero and its negative half-cycles inverted; a plurality of current switch units each connected to said signal transform units respectively for receiving said analog speech signal from said signal transform units, each of said current switch units including first and second output terminals to send out a current for positive half-cycles of said analog speech signal from said first output terminal and back from said second output terminal and to send out a current for said negative half-cycles of said analog speech signal from said second output terminals and back from said first output terminal; wherein said first output terminal of said current switch units are connected together to form a first connected output terminals; wherein said second output terminal of said current switch units are connected together to form a second connected output terminal; a comparison unit for comparing voltages of said first and second connected output terminals and then sending out a control signal; and a current output unit for receiving and sending out currents from said first and second connected output terminals from a first and second drive terminals under control of said control signal from said comparison unit.