Frame-based spectral shaping method and apparatus

Details Frame-based spectral shaping method and apparatus Frame-based spectral shaping method and apparatus

1997-06-09

1999-12-07

Tokar, Michael

Coded data generation or conversion

Digital code to digital code converters

To or from minimum d.c. level codes

341 50, 341 76, 341 95, H03M 500

Patent

active

059991097

ABSTRACT:
An improved DC compensation method for use in conjunction with telephony signalling. The method includes defining a frame that includes at least two n-bit codewords. An unsigned codeword is then identified within the frame by applying a rule to the codewords in the defined frame. Next, a sign bit is appended to the unsigned codeword, thereby producing a DC compensating codeword. The sign bit is selected based upon a weighting function of the linear values associated with previously transmitted codewords. The remaining unsigned codewords in the frame are assigned sign bits from user data.

REFERENCES:
patent: 5365231 (1994-11-01), Niimura et al.
patent: 5602547 (1997-02-01), Maeno et al.
patent: 5801695 (1998-09-01), Townshend
patent: 5809075 (1998-09-01), Townshend
patent: 5825824 (1998-10-01), Lee et al.
patent: 5835538 (1998-11-01), Townshend
patent: 5859872 (1999-01-01), Townshend
International Search Report, PCT/US98/15114, mailed Feb. 1, 1999.

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