Excavating
Patent
1995-06-27
1998-09-01
Baker, Stephen M.
Excavating
360 29, G11B 2008
Patent
active
058020810
ABSTRACT:
Information is divided into first blocks each having m bits, and n bit or bits in each of S different states are added to a head of each of the first blocks to change the first block into S second blocks each having m+n bits, where m and n denote predetermined natural numbers and S denotes a predetermined natural number equal to or smaller than 2.sup.n. Each of the S second blocks is pre-coded into S pre-coded information blocks respectively. One of the S pre-coded information blocks is selected as a modulation-resultant information signal in response to error signals related to the S pre-coded information blocks respectively. The modulation-resultant information signal has q different notch frequencies. The S pre-coded information blocks are converted into S amplitude signals representing amplitude values respectively. A set of q first waveform signals and a set of q second waveform signals are generated. The q first waveform signals represent waveforms related to the q notch frequencies respectively. The q second waveform signals are different in phase from the q first waveform signals by 90.degree. respectively. Each of the S amplitude signals and the 2q waveform signals are multiplied into 2q multiplication-resultant signals. The 2q multiplication-resultant signals are added and accumulated into 2q addition-resultant signals respectively with respect to each of the S pre-coded information blocks. An error signal is generated in response to the 2q addition-resultant signals, and thereby the S error signals are generated which relate to the S pre-coded information blocks respectively.
REFERENCES:
patent: 5140474 (1992-08-01), Kahlman et al.
patent: 5142421 (1992-08-01), Kahlman et al.
patent: 5432651 (1995-07-01), Maeno et al.
patent: 5579182 (1996-11-01), Hamai et al.
Baker Stephen M.
Victor Company of Japan Ltd.
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