| 摘要 |
PURPOSE:To simplify the constitution of a hardware and to reduce the hardware quantity, by converting a 3-bit data into a 2-bit code. CONSTITUTION:The EFM signal supplied to a terminal 9 is turned into a parallel data output of 14 bits by a shift register 3. Each parallel output is converted into a parallel data of 10 bits by each of logical converters 11-14 of 3-bit input/2-bit output. This parallel data is supplied to a demodulator ROM15. The ROM15 consists of an input address of 10 bits and an output terminal of 8 bits and decodes the data of 10 bits in a single meaning to send it to a latching circuit 7. This data is held by a latching signal. Thus an EFM demodulated data is obtained at a latch output terminal 8. |
