| 摘要 |
PURPOSE:To test both reproducing and error correcting functions with a minimum memory function by forming a digital signal whose missing length is controlled from each ROM for a voice signal, a synchronizing signal and a control signal. CONSTITUTION:The ROM15 for control data signal is provided additionally in addition to the ROM13 for synchronizing signal and voice signal. A signal read from the ROMs 13, 15 is synthesized by a control signal generated from the combination of decoders 17-19 for generating control signal and a control signal generating circuit 20 to form a prescribed output signal for test. The operation of the circuit 20 is started by a reset input signal and stopped by a control clock input signal, and generates a signal of the mode of optional K bits, allowing to form a digital signal controlled into an optional missing length as a signal changeover timing of the ROMs 13, 15 and a pseudo error signal in the mode with maximum 2<k> kinds. |
