Signal processor

Details Signal processor Signal processor

1995-11-20

1998-06-16

Chin, Stephen

Pulse or digital communications

Transmitters

Antinoise or distortion

375317, H04K 102

Patent

active

057683182

ABSTRACT:
The present invention discloses a so called Discrete Multi Tone or DMT signal processor which is coupled to a transmitting end of a communication line and which reduces the need for the clipping of the amplitude of the output signal OS'. The signal processor includes the cascade connection of a vector transformation circuit VTC, a modulator MOD and a peak detection circuit PDC. The VTC circuit is provided with a plurality of input vectors IN whereon a vector transformation is performed according to a signal at a control terminal (CT) of the peak detection circuit PDC which is indicative of the fact that the amplitude of the output signal OS provided by the modulator MOD exceeds a predetermined threshold value.

REFERENCES:
patent: 4064464 (1977-12-01), Morse
patent: 4438511 (1984-03-01), Baran
patent: 4679227 (1987-07-01), Hughes-Hartogs
patent: 5302914 (1994-04-01), Arntz et al.
patent: 5530920 (1996-06-01), Takeda
International Conference on Communications 1,9 1994, 1 May 1994-May 5, 1994 IEEE, NY, pp. 293-300 Mestdagh et al, "Analysis of clipping effect in DMT-based ADSL systems".
Electronics Letters, 22 Jul. 1993, UK, vol. 29, No. 15, 22 Jul. 1993 ISSN 0013-5194, Mestdagh D.J. et al "Effect of amplitude clipping in DMT-ADSL transceivers".
Electronics Letters, 25 Nov. 1993, US, vol. 29, No. 24, 25 Nov. 1993 ISSN 0013-5194, Gross R. et al, "Clipping distortion in DMT ADSL systems".

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