Circuit arrangement for converting digital sound-signal values i

Details Circuit arrangement for converting digital sound-signal values i Circuit arrangement for converting digital sound-signal values i

1988-02-29

1989-09-19

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341146, H03M 168

Patent

active

048685720

ABSTRACT:
This circuit arrangement includes an interpolation filter (3) which converts the incoming signal values (A) into interpolated signal values (B) of increased repetition frequency. The interpolated signal values (B) are reduced in word length by means of a quantizer (4a) and by quantization error feedback through an error filter (25). A D/A converter (6) consists of two or more nonweighted switching stages connected in parallel. The activated switching stages deliver currents which are added together at the output end. The D/A converter (6) is controlled by a control circuit (5) which processes the output signals (D) of the quantizer (4a). The activated switching stages are continuously interchanged on a cyclic basis, so that relative resistance tolerances in the circuit average out.

REFERENCES:
patent: 4137525 (1979-01-01), Tyrrel
patent: 4539553 (1985-09-01), Takeda et al.
patent: 4590457 (1986-05-01), Amir
patent: 4704600 (1987-11-01), Uchimura et al.
G. R. Ritchie, James C. Candy, and William H. Ninke, "Interpolative Digital-to-Analog Converters", in IEEE Transactions on Communications, volume COM-22, No. 11, Nov. 1974, pp. 1797-1806.
Robert W. Adams, "Design and Implementation of an Audio 18-Bit Analog-to-Digital Converter Using Oversampling Techniques", in J. Audio Eng. Soc., vol. 34, No. 3, Mar. 1986, pp. 153-166.

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