CN209845281U - Digital audio mixing circuit system with digital isolation circuit - Google Patents

Abstract

The utility model discloses a digital audio hybrid circuit system with a digital isolation circuit, which comprises an analog unit, a digital isolation unit and a digital unit; the analog unit comprises an analog power supply, an ADC module for processing input audio, a DAC module for processing output audio and an analog ground; the digital isolation unit comprises a digital isolation chip I and a digital isolation unit II; the digital unit comprises a digital power supply, a digital signal processing unit and a digital ground; the analog power supply and the analog ground are respectively and electrically connected with the ADC module, the DAC module, the first isolation chip and the second digital isolation unit; the first digital isolation chip is electrically connected with the ADC module; the digital power supply and the digital ground are respectively electrically connected with the digital signal processing unit; and the second digital isolation chip is electrically connected with the digital signal processing unit and the DAC module respectively. After the technology is adopted, the analog signals become cleaner, and the acquisition, measurement and calculation are more accurate.

Description

Digital audio mixing circuit system with digital isolation circuit

Technical Field

The utility model relates to a digital audio hybrid circuit system field especially relates to a take digital audio hybrid circuit system of digital buffer circuit.

Background

The research of digital-analog mixing circuits (particularly audio circuits) is still in the first stage in the world, and indexes on many audio analog signals cannot be parameterized and standardized, so that the research in the field is delayed at present. In addition, some indexes affecting the current audio audibility cannot be indexed.

In present digital-to-analog hybrid circuit applications. The digital processing and analog processing circuit are connected by adopting AD-DSP-DA (analog signals are converted into digital signals through AD, and are converted into analog signals through DA after being processed by DSP/MCU). The DSP processing system comprises a clock circuit, a digital oscillation circuit and a DC power supply, but the system is directly connected with the DSP through a digital data line with the AD and the DA. In this case, some noise of the digital part itself will interfere with the analog signal to a certain extent. Resulting in a large amount of "digital sound", "current sound", and even disturbing sound in present digital audio processing devices. Resulting in an inaudible final result. Or the phenomenon that the parameter index is not high and inaccurate in a digital-analog system.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects existing in the prior art, the utility model provides a take digital audio hybrid circuit system of digital isolation circuit.

In order to achieve the above object, the utility model adopts the following technical scheme: a digital audio mixing circuit system with a digital isolation circuit comprises an analog unit, a digital isolation unit and a digital unit; the analog unit comprises an analog power supply, an ADC module for processing input audio, a DAC module for processing output audio and an analog ground; the digital isolation unit comprises a digital isolation chip I and a digital isolation unit II; the digital unit comprises a digital power supply, a digital signal processing unit and a digital ground; the analog power supply and the analog ground are respectively and electrically connected with the ADC module, the DAC module, the first isolation chip and the second digital isolation unit; the first digital isolation chip is electrically connected with the ADC module; the digital power supply and the digital ground are respectively electrically connected with the digital signal processing unit; and the second digital isolation chip is electrically connected with the digital signal processing unit and the DAC module respectively. In a further improvement, the first isolation chip and the second digital isolation unit both adopt NSI8141 chips. In a further improvement, the ADC module comprises a microphone module and a music module; the microphone module adopts an AK5385 chip; the music module adopts a WM8786 chip; the DAC module comprises a main sound channel module, a middle ultra-low sound channel module and a surrounding sound channel module; the main sound channel module, the middle ultra-low sound channel module and the surround sound channel module all adopt PCM1794 chips.

The MCLK-OUT pin, the MIC AD-IN pin, the BCLK-OUT pin and the LRCK-OUT pin of the AK5385 chip are respectively connected with the MCLK-OUT pin, the MIC AD-IN pin, the BCLK-OUT pin and the LRCK-OUT pin of the first digital isolation chip; an MIC AD-OUT pin, an MCLK-IN pin, a BCLK-IN pin and an LRCK-IN pin of the first digital isolation chip are connected with the MCLK-IN pin, the MICAD-OUT pin, the BCLK-IN pin and the LRCK-IN pin of the DSP1 module respectively; the MUS AD-OUT pin, the DA1-IN pin, the DA2-IN pin and the DA3-IN pin of the DSP1 module are respectively connected with the MUS AD-OUT pin, the DA1-IN pin, the DA2-IN pin and the DA3-IN pin of the second digital isolation chip; the MUS AD-IN pin of the second digital isolation chip is connected with the MUS AD-IN pin of the WM8786 chip; the DA1-IN pin, the DA2-IN pin and the DA3-IN pin of the second digital isolation chip are respectively connected with the DA1-IN pin, the DA2-IN pin and the DA3-IN pin of the three PCM1794 chips; the MCLK-OUT pin, the BCLK-OUT pin and the LRCK-OUT pin of the three PCM1794 chips and the WM8786 chip are connected with the MCLK-OUT pin, the BCLK-OUT pin and the LRCK-OUT pin of the first digital isolation chip.

After the technical scheme is adopted, the newly-added digital isolation chip can isolate the digital signal and the digital power supply, and effectively reduces the interference of a digital circuit to an analog signal, particularly millivolt interference or microvolt interference. In addition, the acquisition registration can be effectively improved by a digital-analog hybrid system, such as an analog signal acquisition system. In an audio system, the 'digital sound' or interference caused by a digital circuit can be effectively removed. After the digital signal is isolated, the analog signal becomes better and cleaner. The analog signals are more accurate in acquisition, measurement and calculation.

Drawings

Fig. 1 is a block diagram of a digital audio mixing circuit system with a digital isolation circuit.

Fig. 2 is a circuit diagram of a digital isolation unit.

Fig. 3 is a circuit diagram of an AK5385 chip.

Fig. 4 is a circuit diagram of a WM8786 chip.

Fig. 5 is a circuit diagram of a first PCM1794 chip.

FIG. 6 is a circuit diagram of a second PCM1794 chip.

FIG. 7 is a circuit diagram of a third PCM1794 chip.

Fig. 8 is a circuit diagram of an analog power supply and an analog ground of the analog unit.

Fig. 9 is a circuit diagram of a DSP1 chip.

Fig. 10 is a circuit diagram of a digital power supply of the digital unit.

Detailed Description

The preferred embodiments of the present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1 to 10, a digital audio mixing circuit system with a digital isolation circuit includes an analog unit, a digital isolation unit, and a digital unit.

The analog unit comprises an analog power supply, an ADC module for processing input audio, a DAC module for processing output audio and an analog ground; the digital isolation unit comprises a digital isolation chip I and a digital isolation unit II; and the first isolation chip and the second digital isolation unit both adopt NSI8141 chips.

The digital unit comprises a digital power supply, a digital signal processing unit and a digital ground; the analog power supply and the analog ground are respectively and electrically connected with the ADC module, the DAC module isolation chip I and the digital isolation unit II; the first digital isolation chip is electrically connected with the ADC module and the digital signal processing unit respectively; the digital power supply and the digital ground are respectively electrically connected with the digital signal processing unit; and the second digital isolation chip is electrically connected with the digital signal processing unit and the DAC module respectively.

To better illustrate the technical solution of the present application, an actual circuit is illustrated, in the technical solution of the present application, the ADC module includes a microphone module and a music module; the DAC module comprises a main sound channel module, a middle ultra-low sound channel module and a surrounding sound channel module; the following chips are preferably used, wherein the microphone module uses an AK5385 chip; the music module adopts a WM8786 chip; the main sound channel module, the middle ultra-low sound channel module and the surround sound channel module all adopt PCM1794 chips. The digital signal processing unit employs a DSP1 module.

The connection relationship among the chips is as follows: the MCLK-OUT pin, the MIC AD-IN pin, the BCLK-OUT pin and the LRCK-OUT pin of the AK5385 chip are respectively connected with the MCLK-OUT pin, the MIC AD-IN pin, the BCLK-OUT pin and the LRCK-OUT pin of the first digital isolation chip; an MIC AD-OUT pin, an MCLK-IN pin, a BCLK-IN pin and an LRCK-IN pin of the first digital isolation chip are connected with the MCLK-IN pin, the MIC AD-OUT pin, the BCLK-IN pin and the LRCK-IN pin of the DSP1 module respectively; the MUS AD-OUT pin, the DA1-IN pin, the DA2-IN pin and the DA3-IN pin of the DSP1 module are respectively connected with the MUS AD-OUT pin, the DA1-IN pin, the DA2-IN pin and the DA3-IN pin of the second digital isolation chip; the MUS AD-IN pin of the second digital isolation chip is connected with the MUS AD-IN pin of the WM8786 chip; the DA1-IN pin, the DA2-IN pin and the DA3-IN pin of the second digital isolation chip are respectively connected with the DA1-IN pin, the DA2-IN pin and the DA3-IN pin of the three PCM1794 chips; the MCLK-OUT pin, the BCLK-OUT pin and the LRCK-OUT pin of the three PCM1794 chips and the WM8786 chip are connected with the MCLK-OUT pin, the BCLK-OUT pin and the LRCK-OUT pin of the first digital isolation chip.

The working principle is as follows: the technical scheme eliminates the interference of a digital power supply, a digital signal and a digital auxiliary circuit to an analog signal and an analog circuit, and adopts a digital isolation chip between the analog unit and the digital unit to realize the direct isolation of the digital unit and the analog unit. The digital unit is not influenced by the parameters of the analog unit. The analog signal will be cleaner. Improve the auditory sense and improve the measurement index.

The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.

Claims (4)

1. A digital audio mixing circuit system with a digital isolation circuit is characterized by comprising an analog unit, a digital isolation unit and a digital unit; the analog unit comprises an analog power supply, an ADC module for processing input audio, a DAC module for processing output audio and an analog ground;

the digital isolation unit comprises a digital isolation chip I and a digital isolation unit II; the digital unit comprises a digital power supply, a digital signal processing unit and a digital ground;

the analog power supply and the analog ground are respectively and electrically connected with the ADC module, the DAC module, the first isolation chip and the second digital isolation unit;

the first digital isolation chip is electrically connected with the ADC module; the digital power supply and the digital ground are respectively electrically connected with the digital signal processing unit; and the second digital isolation chip is electrically connected with the digital signal processing unit and the DAC module respectively.

2. The digital audio mixing circuit system with digital isolation circuit of claim 1, wherein the first isolation chip and the second digital isolation unit both use NSI8141 chips.

3. The digital audio mixing circuit system with digital isolation circuit of claim 2, wherein the ADC module comprises a microphone module and a music module; the microphone module adopts an AK5385 chip; the music module adopts a WM8786 chip; the DAC module comprises a main sound channel module, a middle ultra-low sound channel module and a surrounding sound channel module; the main sound channel module, the middle ultra-low sound channel module and the surround sound channel module all adopt PCM1794 chips.

4. The digital audio mixing circuit system with digital isolation circuit of claim 3, wherein the MCLK-OUT pin, MIC AD-IN pin, BCLK-OUT pin and LRCK-OUT pin of the AK5385 chip are connected to the MCLK-OUT pin, MIC AD-IN pin, BCLK-OUT pin and LRCK-OUT pin of the first digital isolation chip, respectively;

an MIC AD-OUT pin, an MCLK-IN pin, a BCLK-IN pin and an LRCK-IN pin of the first digital isolation chip are connected with the MCLK-IN pin, the MIC AD-OUT pin, the BCLK-IN pin and the LRCK-IN pin of the DSP1 module respectively;

the MUS AD-OUT pin, the DA1-IN pin, the DA2-IN pin and the DA3-IN pin of the DSP1 module are respectively connected with the MUS AD-OUT pin, the DA1-IN pin, the DA2-IN pin and the DA3-IN pin of the second digital isolation chip;

the MUS AD-IN pin of the second digital isolation chip is connected with the MUS AD-IN pin of the WM8786 chip;

the DA1-IN pin, the DA2-IN pin and the DA3-IN pin of the second digital isolation chip are respectively connected with the DA1-IN pin, the DA2-IN pin and the DA3-IN pin of the three PCM1794 chips;

the MCLK-OUT pin, the BCLK-OUT pin and the LRCK-OUT pin of the three PCM1794 chips and the WM8786 chip are connected with the MCLK-OUT pin, the BCLK-OUT pin and the LRCK-OUT pin of the first digital isolation chip.