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Digital-analog converter circuit

A digital-to-analog converter and circuit technology, applied in the direction of digital-to-analog converter, transducer circuit, analog-to-digital conversion, etc., can solve the problems of expensive switchable microphone lines, etc.

Inactive Publication Date: 2017-12-08
TYMPHANY HK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Traditional audio amplifiers usually need to provide low current DC output or very expensive switchable microphone cable

Method used

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Embodiment Construction

[0007] Various non-limiting embodiments described herein provide a "voltage out" digital-to-analog converter IC (DAC) follower low-pass filter with a high current direct coupled output stage. The DAC of the present disclosure is capable of generating low impedance such that the DAC can be coupled directly to analog components such as audio headphones. The term "direct coupled" refers to the ability of the DAC to be connected directly to audio headphones at the output stage without the need for a DC blocking capacitor in series with the output signal. Therefore, the DAC circuit can be directly connected to a voltage output digital-to-analog converter integrated circuit (IC). The ability to directly couple audio headphones, for example, allows output capacitors to be omitted from the output stage design. As a result, the frequency response caused by the output capacitor, which is related to the impedance of the connected earphones found in conventional audio systems, is elimina...

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Abstract

The invention discloses a digital-analog converter circuit. The pre-amplifier circuit includes a microphone pre-amplifier stage with a direct injection (DI) unit that provides a high impedance source signal and a low impedance XLR connection operable without a line or mic switch.

Description

technical field [0001] The present disclosure relates to audio applications, and more particularly, to audio amplifier circuits. Background technique [0002] Traditional audio amplifiers typically provide low current DC outputs or very expensive switchable microphone cables. In a digital audio system, for example, a headphone output line usually requires a digital-to-analog converter (DAC) to convert the digital output signal into an analog audio signal that can be output from the headphone. DACs usually require low-pass filter circuits to filter out high-frequency noise in the audio band. To achieve audio band high frequency noise filtering, conventional systems employ a separate low pass filter stage before a second separate headphone amplifier stage. Contents of the invention [0003] According to one embodiment, a preamplifier circuit is provided that includes a microphone preamplifier stage. The microphone preamplifier stage includes a direct input (DI) unit opera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/00H03F1/56H03M1/66H03F3/20
CPCH04R3/00H04R3/005H03F1/00H03F1/56H03F3/20H03M1/66H04R2430/00H03F2200/03H03F1/3211H03F3/187H03F3/68H03F2203/45526H03F3/45475H03F2200/387H03F1/0227H03F1/083H04R5/04H03F3/183H04R3/04H03F3/21H03M1/0854H03F2200/555H03F2200/372H03F2200/222H03F3/181H03F3/45076H03F3/45636H03M1/668H03F1/3205H03F3/185H03F3/087H03F3/601H04R5/033
Inventor 塞巴斯蒂安·德弗里斯
Owner TYMPHANY HK