Title:
【発明の名称】ディジタル伝送システム
Document Type and Number:
Japanese Patent JP2776290
Kind Code:
B2
Abstract:
An analogue audio signal input to a transmission unit 1 is band limited into a frequency band lower than that of a main signal pass with a low-pass filter 21 and then converted into a digital value with a sampling clock lower than the main signal pass by an analogue/digital converter 22. All bits of the converted digital signal are inverted by an inverter 23. The digital signal input to a reception unit 3 via a transmission channel 100 is inverted by inverter 42 and is digital/analogue converted by digital/analogue converter 43 with the sampling clock lower than the main signal pass. The resultant signal is band limited into the low frequency band through a low-pass filter 44 and then output to a level comparator 45. A low-pass filter 46 band limits the signal for the main signal pass into the low frequency bang. The level comparator 45 compares the output level of the low-pass filter 44 with that of the low-pass filter 46.
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Inventors:
OOSAKI FUMIMASA
WAKABAYASHI HIROSHI
WAKABAYASHI HIROSHI
Application Number:
JP5484095A
Publication Date:
July 16, 1998
Filing Date:
March 15, 1995
Export Citation:
Assignee:
NIPPON DENKI KK
International Classes:
H04L1/00; H04B3/46; H04B17/00; H04J3/14; H04L1/24; (IPC1-7): H04J3/14; H04B17/00; H04L1/00
Domestic Patent References:
| JP5023565B1 | ||||
| JP5023566B1 |
Attorney, Agent or Firm:
Yanagi Kawa Shin