Ripple elimination in a frequency-to-voltage converter for a cross-coil meter

An automobile meter comprising:

• (a) a pulse generator for generating a periodic pulse signal which has a predetermined width at a predetermined period as it relates to the frequency of an input signal supplied to the pulse generator;
• (b) an integrator for integrating the pulse signal and outputting the integrated signal as a signal voltage;
• (c) means for detecting and inverting a ripple component in the output of said integrator and transmitting an inverted output;
• (d) a superimposing circuit for superimposing the output from said detecting and inverting means on the output of said integrator to eliminate the ripple component;
• (e) a driving signal generator for generating a plurality of driving signals having different values according to output values of said integrator respectively;
• and
• (f) a plurality of pointer driving coils which are so as to cross each other and to which driving signals are applied from the respective associated drive signal generators.