PURPOSE: To produce the high-accuracy tuning voltage and thus to enhance the tuner yield by securing a constitution in that the operation data is acquired from the tuning voltage-frequency variation characteristics of the tuner.
CONSTITUTION: The following devices are provided: tuner 1; receiving channel designation device 6; memory 3 which memorizes the operation data necessary for approximation of the tuning voltage-frequency variation characteristics of the tuner and through which the operation data is read out selectively via device 6; arithmetic unit 4 which produces the codes based on the operation data; D/A converter 5 which forms the tuning voltage via the codes of unit 4; code generating circuit 13 which generates the codes to be supplied to D/A converter 5; reverse arithmetic unit 19 which carries out the operation to obtain the operation data by the codes supplied from circuit 13 when tuner 1 tunes with two different sampling channels respectively. Thus, the operation data given from unit 19 is memorized in memory 3 to obtain the high-accuracy tuning voltgae
OKADA HISAO
MOGI NORIO
