| 摘要 |
PURPOSE:To obtain the signal generating circuit without requiring aperture correction after D/A conversion, by correcting PCM data stored in ROM in advance by a given method. CONSTITUTION:PCM data multiplied in the factor of G=Sin [(F/FSP)Xpi]/[(F/ FSP)Xpi] (where; F is signal frequency and FSP is sampling frequency) of a given level is stored in ROM2'. Further, when an addresser circuit 1 generates the address of ROM2', the PCM data stored in the ROM2' according to the address in advance is read out. After the output of ROM2' enters a D/A converter 3 and is converted into the PAM signal, and it it delivered to an output terminal 6 via a low-pass filter 5. |
