RECORDING SYSTEM FOR PLURALITY OF CHANNEL OF AUDIO SIGNAL

• Main Authors: ITOU SHIGEYUKI, WATAYA YOSHIZUMI
• Format: Patent
• Language: English
• Published: 30.08.1982
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

PURPOSE:To make the discrimination of content of audio signals of a plurality of channels easy, by specifying the frequency of a pilot signal to almost (2N+ 1)/2 times the video signal horizontal scanning frequency in frequency multiplexing. CONSTITUTION:The frequency of a pilot signal used for the discrimination of content of a plurality of chnnel audio signals is restricted to almost (2N+1)/ 2 times the horizontal synchronizing signal to avoid the cross modulation noise with an FM modulation video signal. That is, a difference signal of stereo audio or a sub-audio signal is inputted from an input terminal 2, and after a pilot signal in different frequency is added at an adder 10 according to stereo audio and double audio, the result is modulated in an FM modulator 4. The pilot signal is a signal formed from a horizontal synchronizing signal in frequency fH from an input terminal 11 at a 2.5 multiplication circuit 13 and a 3.5 multiplication circuit 14. Thus, the reproduced S/N of the pilot signal is increased and the discrimination of content of a plurality of channel audio signals is made easy.