| 摘要 |
PURPOSE:To reduce the number of signal lines and switch circuits to simplify the circuit, by providing on change-over switch for each of plural signal processing blocks and by switching this switch to search the fault of an arbitrary block. CONSTITUTION:The digital signal processing device which becomes the object of fault search is divided into plural signal processing blocks 1-8, and change-over switches 11-18 are provided at output terminals of respective processing blocks, and these swithes are switched to supply the diagnostic test signal for checking presence or absence of the fault from test signal generating circuit 9 to an arbitary block of signal processing blocks, and the test signal output from the signal processing to be tested is checked (diagonsed) by test signal checking circuit 10. By this simple circuit constitution with change-over switches provided in respective signal processing blocks, the fault of an arbitrary processing block is searched. |
