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Audio Signal Processing

Analog-to-digital-converter

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Cabinet for loudspeaker

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Analog to digital converter

Details

Inventors: Ueki, Masaaki;
Assignee: Sony Corporation (Tokyo, JP)
Primary Examiner: Young; Brian K.
Assistant Examiner:
Attorney, Agent or Firm: Maioli; Jay H.

Analog audio signals supplied via an analog signal input terminal 1 are translated in parallel via a first .DELTA..SIGMA. modulator 2 and a second .DELTA..SIGMA. modulator 3 into digital audio data which are summed together by an additive node 4. The resulting sum data is attenuated in level by an attenuator 5 and translated by a decimation filter 6 into audio data having a predetermined number of bits and resulting audio data is outputted via an audio data output terminal 7. There is no necessity of providing a decimation filter for each .DELTA..SIGMA. modulator, so that the number of components may be reduced and the circuit may be simplified in construction to lower production costs. Besides, there is no necessity of re-quantizing the audio data at an output stage so that no quantization noise is produced to enable the S/N ratio to be improved by a theoretical value of 3 dB.

DETAILED DESCRIPTION In view of the above-described problem of the prior art, it is an object of the present invention to provide an A/D converter whereby the number of the component parts, the circuit scale and costs may be diminished and whereby the in-phase components may be removed for improving the S/N ratio of output audio data.
According to the present invention, there is provided an analog to digital converter comprising a plurality of .
DELTA.
.
SIGMA.
modulators for translating analog signals from outside into digital signals in parallel and outputting the resulting translated data, addition means for summing plural digital data supplied from the .
DELTA.
.
SIGMA.
modulators for generating sum data and outputting the sum data, attenuating means for dividing the sum data from the addition means by a number equal to the number of the .
DELTA.
.
SIGMA.
modulators for generating quotient data and outputting the quotient data, and a decimation filter for translating the quotient data from the attenuating means into digital data having a predetermined number of bits larger than the number of bits of the quotient data, and outputting the digital data.
The plural .
DELTA.
.
SIGMA.
modulators of the A/D converter according to the present may comprise two .
DELTA.
.
SIGMA.
modulators, that is a first .
DELTA.
.
SIGMA.
modulator and a second .
DELTA.
.
SIGMA.
modulator.
According to the present invention, there is also provided an analog to digital converter comprising a first .
DELTA.
.
SIGMA.
modulator for translating analog signals supplied from outside into digital data and outputting the digital data, phase inverting means for phase-inverting the analog signals supplied from outside and outputting the phase-inverted analog signals, a second .
DELTA.
.
SIGMA.
modulator for translating the phase-inverted analog signals from the phase inverting means into digital data and outputting the digital data, sign-inverting addition means for inverting the sign of the digital data converted from the phase-inverted analog signals by the second

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