Method and device for monitoring an abnormality in digitally tra

Details Method and device for monitoring an abnormality in digitally tra Method and device for monitoring an abnormality in digitally tra

1996-03-15

1998-07-21

Pham, Chi H.

Pulse or digital communications

Testing

370242, 370284, 371 48, H04B 346, H04J 314

Patent

active

057844070

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.

REFERENCES:
patent: 5502716 (1996-03-01), Rhebergen

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