| 摘要 |
PURPOSE:To simultaneously process both the information of analog and digital, by the constitution that the analog signal is stored or output on pulse groups of other digital data with a modulation system in which the time of one-bit interval of data pulse is changed, in inputting and outputting the analog signal to a magnetic storage device. CONSTITUTION:An analog signal (e.g. abc...) AD enters an oscillator 11 the oscillating frequency of which is changed with a voltage or a current via an amplifier 10, and clock pulses CP are fed to a modulation circuit 12. The modulator 12 mixes CP and a digital data DD, and the output PG is stored in a storage medium 15 with a write-in circuit 13 and a magnetic head 14. The data PG obtained from a storage medium 16 and a magnetic head 17 and further a read-in circuit 18, becomes an analog signal PO via a shape circuit 19 and a phase synchronism circuit 22 and is output as an audio at a speaker 29 via a BPF27. On the other hand, a signal PG' is separated into an SPDT1 and an SPCL1 at a data clock separation circuit 20. Accordingly, both the analog and digital information can simultaneously be processed. |
