CN212812004U

CN212812004U - Analog audio mixing system

Info

Publication number: CN212812004U
Application number: CN202021937342.3U
Authority: CN
Inventors: 李红果
Original assignee: Beijing Shijichen Data Technology Co ltd
Current assignee: Beijing Shijichen Data Technology Co ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2021-03-26
Anticipated expiration: 2030-09-07

Abstract

The application discloses simulate audio mixing system, including audio signal input module, audio signal amplification module, audio frequency processing chip, audio mixing output module, program signal input module and MCU controller: the audio signal input module is communicated with the audio signal amplification module and is used for accessing an audio signal; the audio signal amplification module is communicated with the audio processing chip and is used for amplifying the received audio signal; the audio processing chip is respectively communicated with the audio mixing output module and the MCU controller and is used for processing audio signals; the audio mixing output module is used for carrying out output processing on the audio signals input to the audio processing chip; the MCU controller is used for controlling the frequency processing chip; the program signal input module is communicated with the MCU controller and used for receiving program data externally so as to output a control program to the MCU controller. The method and the device reduce the production cost and simultaneously enlarge the input range of the sound matrix to the audio signals.

Description

Analog audio mixing system

Technical Field

The application relates to the technical field of audio regulation and control, in particular to an analog audio mixing system.

Background

The audio system is part of a sound simulation system in the flight simulator and is responsible for simulating audio signals such as voice communication, navigation audio, warning prompt tones and the like which can be heard by cockpit operators. When sound signals such as navigation audio, warning prompt tones and the like are operated in a specific flight state or on related equipment of a cockpit, the sound signals are generated and output by an audio computer, voice communication comprises personnel voice communication in the cockpit and voice communication among multiple simulators, the transmission and processing of the sound signals are completed by a multi-channel audio matrix with a program control function, the audio matrix can carry out program control adjustment on volume before audio mixing on the input audio signals, and the audio signals of each input channel can be independently and program-controlled to be mixed to any output channel. Most of commercially available audio equipment are products applied to occasions such as households, recording studios, various venues, buildings and the like, and the products are very inconvenient to apply to a flight simulation system.

For the existing sound system used for the flight simulator, a sound mixing matrix is mainly adopted, and the MCU controller is adopted to control the digital potentiometer to realize volume adjustment, and because the minimum resistance value of the digital potentiometer cannot be zero, an analog switch is required to be added for gating an audio signal in order to realize silence; if an 8-channel mixing function is implemented, an 8 × 8-64 channel analog switch and a 64 channel digital potentiometer are required, as shown in fig. 1, which is an n × n channel analog mixed audio matrix block diagram.

Although the existing scheme realizes the multi-channel program control audio mixing function, the number of used components of the circuit is large, for example, an 8-channel mixing matrix needs 64-channel single-selection analog switches and 64-channel digital potentiometers. The number of controller ports required for controlling the devices is very large, and the control needs to be realized through a CPLD or an FPGA chip, so that the cost is high; meanwhile, the digital potentiometer can only attenuate the input signal, and the processed audio signal amplitude is small, so that the input range of the audio signal by the audio mixing matrix realized by the prior art is limited.

SUMMERY OF THE UTILITY MODEL

The present application is directed to an analog audio mixing matrix to reduce the cost and simultaneously expand the input range of the audio mixing matrix for the audio signal.

In order to achieve the above object, the present application provides the following techniques:

the utility model provides a simulate audio mixing system, includes audio signal input module, audio signal amplification module, audio frequency processing chip, audio mixing output module, program signal input module and MCU controller:

the audio signal input module is communicated with the audio signal amplification module and is used for accessing an audio signal;

the audio signal amplification module is communicated with the audio processing chip and is used for amplifying the received audio signal;

the audio processing chip is respectively communicated with the audio mixing output module and the MCU controller and is used for processing audio signals;

the audio mixing output module is used for carrying out output processing on the audio signals input to the audio processing chip;

the MCU controller is used for controlling the frequency processing chip;

the program signal input module is communicated with the MCU controller and used for receiving program data externally so as to output a control program to the MCU controller.

Wherein, audio signal input module includes 8 way audio signal, and the audio frequency is handled the chip and is included 8 audio frequency and handle the chip, and sound mixing output module includes 8 way sound mixing outputs:

the 8 paths of audio signals are all communicated with the audio signal amplification module;

the 8 audio processing chips are all communicated with the audio signal amplification module;

the 8 paths of mixed sound output are respectively and correspondingly communicated with 8 audio processing chips.

Wherein, audio signal input module still includes 9 way and the audio signal more than 9 ways, and the audio frequency processing chip includes the audio frequency processing chip more than 9 pieces and 9 pieces, and the audio mixing output module includes the audio mixing output more than 9 ways and 9 ways:

the 9 paths of audio signals and more than 9 paths of audio signals are communicated with the audio signal amplification module;

the 9 or more than 9 audio processing chips are communicated with the audio signal amplification module;

the 9 paths of mixed sound output and the more than 9 paths of mixed sound output are respectively communicated with 9 pieces of audio processing chips and more than 9 pieces of audio processing chips.

The audio signal amplifying module is a primary amplifying circuit.

The audio processing chip adopts an ESS Canyon3D model.

The control chip in the MCU controller adopts STM32F101T6U6A QFN 36.

Compared with the prior art, this application can bring following technological effect: according to the technical scheme, the multichannel analog audio mixing matrix function is realized by adopting fewer components and simple circuits, the reliability is enhanced, the cost is reduced, a 32dB program control signal gain function and a maximum 7VP-P supporting input audio signal range are provided, and the applicability of the device to various analog audio terminal devices is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:

fig. 1 is a schematic diagram of a mixed audio matrix framework in the background art of the present invention;

fig. 2 is a schematic diagram of a mixed audio matrix module according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a mixed audio matrix framework according to an embodiment of the present invention;

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

In embodiment 1, as shown in fig. 2 and 3, an analog audio mixing system includes an audio signal input module, an audio signal amplification module, an audio processing chip, a mixing output module, a program signal input module, and an MCU controller: the audio signal input module is communicated with the audio signal amplification module and is used for accessing an audio signal; the audio signal amplification module is communicated with the audio processing chip and is used for amplifying the received audio signal; the audio processing chip is respectively communicated with the audio mixing output module and the MCU controller and is used for processing audio signals; the audio mixing output module is used for carrying out output processing on the audio signals input to the audio processing chip; the MCU controller is used for controlling the frequency processing chip; the program signal input module is communicated with the MCU controller and used for receiving program data externally so as to output a control program to the MCU controller.

Specifically, a general MCU is used as a control core, a novel 8-channel audio processing chip is selected, and the multichannel program-controlled analog audio mixing matrix function is realized. The multi-channel program-controlled analog audio mixing matrix comprises a controller, a primary amplifying circuit, an audio processing chip, a mixing module and the like.

The first-stage amplifying circuit improves the driving capability of input audio signals, output signals of the first-stage amplifying circuit are parallelly connected to a plurality of audio processing chips, and multi-channel audio signals output by the audio processing chips are connected to the sound mixing module to be mixed, buffered and output. The MCU receives an external program control signal, processes the signal and correspondingly controls each audio processing chip through serial port data, so that the volume control of each audio mixing component before audio mixing is realized, and further, the program control simulation audio mixing and audio matrix functions are completed.

Furthermore, a control chip in the MCU controller adopts a model STM32F101T6U6A QFN36, and the model control chip has outstanding performance and is suitable for audio data processing.

The single-chip audio processing chip can process the audio input signals of maximum 4.2Vrms of 8 channels, realize maximum 32dB gain and-95 dB audio attenuation of each channel, adjust and step 0.5dB of audio signals (an automatic microstep adjusting module with built-in adjustable time interval), and independently controllable silence (-115dB) of each channel.

Further, the audio processing chip is of the type ESS Canyon 3D. The audio processing chip of the type is a processing chip with lower cost and excellent performance in the type of the audio processing chip, is the most perfect version in the ESS series, and can exert good compatible effect by matching with the MCU controller.

In other embodiments, for example, 8-channel audio mixing is performed, 8 input audio signals are subjected to a first-stage operational amplifier circuit and then are connected to different audio processing chips in parallel, the audio processing chips can perform independent program-controlled volume gain control on the 8 audio signals per channel, the gain range is 32dB to-95 dB8, and signals output by the audio processing chips are output after passing through the audio mixing circuit. Each group of audio processing chips realizes the program-controlled sound mixing of a group of 8-channel audio signals, and 8 groups of audio processing chips realize the program-controlled sound mixing of 8 groups of 8-channel analog audio signals.

Control data of the audio processing chip is input through a serial data interface, and control data writing is carried out on a target chip through control of a chip selection signal; and the control data of the 8 audio processing chips only occupy 10 general IOs of the MCU controller.

Of course, the mixing matrix of more than 8 channels is also the same as the above structure layout, and the number of the audio signal modules, the audio processing chips and the mixing output modules is correspondingly increased according to the actual channel data condition, and the number relationship is parallel and equal.

Compared with the prior art, the embodiment greatly reduces the use of components, simplifies the circuit, widens the input range of the audio signal, has the function of 32dB audio signal gain, and can realize the volume balance of each channel through the program control gain control if the input audio signal is weaker.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The utility model provides a simulate audio mixing system, includes audio signal input module, audio signal amplification module, audio frequency processing chip, audio mixing output module, program signal input module and MCU controller, its characterized in that:

the MCU controller is used for controlling the frequency processing chip;

2. The analog audio mixing system of claim 1, wherein the audio signal input module comprises 8 audio signals, the audio processing chip comprises 8 audio processing chips, and the mixing output module comprises 8 mixing outputs:

3. The analog audio mixing system of claim 1, wherein the audio signal input module further comprises 9 or more audio signals, the audio processing chip comprises 9 or more audio processing chips, and the mixing output module comprises 9 or more mixing outputs:

4. An analog audio mixing system according to claim 1, 2 or 3, wherein said audio signal amplifying means is a one-stage amplifying circuit.

5. An analog audio mixing system according to claim 1, 2 or 3, characterized in that the audio processing chip is of the type ESS Canyon 3D.

6. An analog audio mixing system as defined in claim 4, wherein the audio processing chip employs ESS Canyon 3D.

7. An analog audio mixing system as claimed in claim 1, 2, 3 or 6, characterized in that the control chip in the MCU controller is of the model STM32F101T6U6A QFN 36.

8. The analog audio mixing system of claim 4, wherein the control chip of the MCU controller is STM32F101T6U6A QFN 36.

9. The analog audio mixing system of claim 5, wherein the control chip of the MCU controller is STM32F101T6U6A QFN 36.