Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1998-02-13
1999-11-02
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
341139, H03M 302
Patent
active
059778962
ABSTRACT:
The digital-to-analog conversion apparatus operates to convert an digital input into a corresponding analog output. A digital filter is provided for oversampling the digital input having a varying value represented in the form of multiple bits. A delta-sigma modulator operates to effect delta-sigma modulation of the oversampled digital input to reduce a number of the multiple bits for requantizing the oversampled digital input with a certain S/N ratio. A low-pass filter is provided for converting the requantized digital input into an analog output. A level detecting circuit is provided for detecting when the value of the digital input falls below a predetermined level. A shifting circuit is disposed upstream of the delta-sigma modulator and is responsive to the detected results for increasing the value of the digital input so as to improve the S/N ratio in the delta-sigma modulator. An attenuator is disposed downstream of the delta-sigma modulator and is responsive to the detected results for effecting decreasing compensation for the increased value of the digital input while substantially maintaining the improved S/N ratio so as to produce an analog output corresponding to the digital input.
REFERENCES:
patent: 4818996 (1989-04-01), Kimura
patent: 5153593 (1992-10-01), Walden et al.
Hirano Masamitu
Homme Mituhiro
Hoshi Juhro
Kishii Tatsuya
Kohdaka Takayuki
Hoff Marc S.
Yamaha Corporation
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