Magnetic tape recording apparatus

A magnetic tape recording apparatus comprising means for subjecting a digital audio signal to predetermined modulation using a predetermined carrier and thereby converting the digital audio signal into a modulated digital audio signal, means for generating an FM audio signal, means for mixing the modulated digital audio signal and the FM audio signal into a composite audio signal, means for superimposing the composite audio signal on a high-frequency bias signal and thereby converting the composite audio signal into a final modulated audio signal, and means for recording the final modulated audio signal into a magnetic tape;

• the improvement comprising:
• first generating means for generating a predetermined basic signal;
• and
• second generating means for generating the predetermined carrier and the bias signal from the basic signal;
• wherein the predetermined carrier and the bias signal have a predetermined frequency relation which is chosen in dependence upon a frequency of beats caused by cross modulation between the modulated digital audio signal and the bias signal.