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Multitrack shared resistor string D/A converter system and output method thereof

A technology of digital simulation and output method, which is applied in the direction of dual-channel system, stereo system, code conversion, etc., can solve the problem that the exchange capacitor filter stage is not easy to share, so as to improve the performance of total harmonic distortion in the fundamental frequency and reduce the crosstalk The effect of the number of resistors and low cost

Inactive Publication Date: 2009-06-17
C-MEDIA ELECTRONICS INC
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Problems solved by technology

[0011] In addition, in multi-channel applications, since the switched capacitor filter stages of traditional sigma-delta digital-to-analog converters are not easy to share, how to further reduce costs and improve product competitiveness has become a problem

Method used

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  • Multitrack shared resistor string D/A converter system and output method thereof
  • Multitrack shared resistor string D/A converter system and output method thereof
  • Multitrack shared resistor string D/A converter system and output method thereof

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Embodiment Construction

[0029] figure 2 It is a system block diagram of a multi-channel shared resistor string digital-to-analog converter according to the present invention. Please refer to figure 2 , wherein the multi-channel shared resistor string digital-to-analog converter 200 is used to convert the signal of the multi-channel digital audio source into a multi-channel analog ladder signal for output. The above-mentioned shared resistor strings can be used as multiple resistor strings in practical applications to reduce the number of resistors. Taking the 16-bit shared resistor string digital-to-analog converter as an example, the shared resistor string can be divided into two resistor strings, and each resistor string contains (2 8 )=256 string resistors, so only 512 string resistors are needed in total. Because the shared resistor string adopted by the present invention avoids the disadvantage of multi-channel resistor-string DACs (multi-channel resistor-string DACs) using multiple sets of...

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Abstract

The invention is a multi track sharing resistance series connecting D / A converter system. It contains a time-sharing interpolator used to output the boosted sampling frequency which is from the input multi track digital sound source.; a time-sharing sigma-delta modulator used to accommodate the multi track digital sound source whose frequency has been boosted in order to output multi track digital sound source with a shorter sample word-length; a multi track sharing resistance series connecting D / A converter used to convert the output of the multi track digital sound source that comes from the modulator into the output of multi track analog staircase wave; and several low RC filter used to make more attenuation of the noise besides fundamental wave located at the multi track analog staircase in order to output the reconstruction multi track analog signal.

Description

technical field [0001] The present invention relates to a multi-channel audio (multi-channel audio) digital-to-analog converter, in particular to a high-resolution multi-channel shared resistor string digital-to-analog converter (digital-to-analog convers; DACs) system and its output method. Background technique [0002] In the audio (audio) digital-to-analog conversion (D / A conversion) field, the sampling frequency to be processed is not high, but the requirement for precision is even greater than other fields. (In the technical field of thraudio digital-to-analog conversion, the conversion rate is not high, but the accuracy requirement is getting more and more stringent.) And because the current music application specifications have moved towards multi-channel (The audio application specifications demand multi- channel playback much more than before), so how to maintain low-cost competitiveness while taking into account multi-channel output and increasingly stringent prec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04S1/00H04S7/00H03M7/30
Inventor 郑期成谢文龙曾志宏吕炎龙
Owner C-MEDIA ELECTRONICS INC
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