CN217116364U - Audio signal processing equipment with adjustable frequency response - Google Patents
Audio signal processing equipment with adjustable frequency response Download PDFInfo
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- CN217116364U CN217116364U CN202220372305.5U CN202220372305U CN217116364U CN 217116364 U CN217116364 U CN 217116364U CN 202220372305 U CN202220372305 U CN 202220372305U CN 217116364 U CN217116364 U CN 217116364U
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Abstract
The utility model discloses a frequency response adjustable audio signal processing equipment, its characterized in that: the device comprises an audio signal transmission module, a DSP audio signal processing module and a control interface module. The control interface module comprises first to fourth analog audio input interfaces and first to eighth analog audio output interfaces; a 4 in 8 out effect is achieved. The audio signal transmission module comprises an analog-to-digital conversion module and a digital-to-analog conversion module; the DSP audio signal processing module comprises an output frequency divider, first to fourth input transmission chains, first to eighth output transmission chains and a 4-in 8-out matrix. The utility model discloses can carry out independent sampling analysis and processing to sound unit feedback sound, export high-quality audio signal. And simultaneously the utility model provides a all kinds of external connection interfaces, convenience of customers carry out individualized customization sound through the external component. The utility model discloses the function is abundant, convenient to use, the performance is powerful, and the wide application is in audio processing technology field.
Description
Technical Field
The utility model belongs to the technical field of the audio processing technique and specifically relates to a frequency response adjustable audio signal processing equipment.
Background
The audio signal processing equipment is used for adjusting the audio signals, and comprises adjustment modes such as equalization, filtering, frequency division, gain and the like, so that the audio signals can realize different sound effects according to different scenes.
The traditional audio signal processing equipment has single function, and has certain limitation when a power amplifier and a loudspeaker unit are selected and matched for a user; when a user needs to set the frequency response of the speaker unit, the user can complete the debugging only by means of the external device, which brings extra workload and expenditure cost to the user.
SUMMERY OF THE UTILITY MODEL
In view of this, an embodiment of the present invention provides an audio signal processing apparatus with adjustable frequency response, which includes an audio signal transmission module, a DSP audio signal processing module, and a control interface module;
the control interface module comprises a first analog audio input interface, a second analog audio input interface, a third analog audio input interface, a fourth analog audio input interface, a first analog audio output interface, a second analog audio output interface, a third analog audio output interface, a fourth analog audio output interface, a fifth analog audio output interface, a sixth analog audio output interface, a seventh analog audio output interface and an eighth analog audio output interface;
the audio signal transmission module comprises an analog-to-digital conversion module and a digital-to-analog conversion module; the digital end of the analog-to-digital conversion module is connected with a first input transmission link, a second input transmission link, a third input transmission link and a fourth input transmission link of the DSP audio signal processing module; a digital end of the digital-to-analog conversion module is connected with a first output transmission link, a second output transmission link, a third output transmission link, a fourth output transmission link, a fifth output transmission link, a sixth output transmission link, a seventh output transmission link and an eighth output transmission link of the DSP audio signal processing module, and an analog end of the digital-to-analog conversion module is connected with a first analog audio output interface, a second analog audio output interface, a third analog audio output interface, a fourth analog audio output interface, a fifth analog audio output interface, a sixth analog audio output interface, a seventh analog audio output interface and an eighth analog audio output interface;
the DSP audio signal processing module comprises an output frequency divider, a first input transmission link, a second input transmission link, a third input transmission link, a fourth input transmission link, a first output transmission link, a second output transmission link, a third output transmission link, a fourth output transmission link, a fifth output transmission link, a sixth output transmission link, a seventh output transmission link, an eighth output transmission link and a 4-in-8-out matrix; the first input transmission link, the second input transmission link, the third input transmission link and the fourth input transmission link are respectively connected to 4 input ends of a 4-in 8-out matrix; the output frequency divider has 8 input ports and 8 output ports, 8 input ports are connected to 8 output ports of the 4-input 8-output matrix, and 8 output ports are respectively connected to the first output transmission link, the second output transmission link, the third output transmission link, the fourth output transmission link, the fifth output transmission link, the sixth output transmission link, the seventh output transmission link, and the eighth output transmission link.
Furthermore, the DSP audio signal processing module also comprises an input equalizer; the first through fourth input transmission links each comprise a noise gate processor, an input booster, an input mute, an input high/low frequency noise booster, an input RMS compressor, an input polarity selector, and an input delay connected in sequence; an input equalizer, which is an intermediate component of the first through fourth input transmission chains, is connected between the input frequency response booster and the input RMS compressor of the respective chain.
Further, the input equalizer comprises four operation modes of 31 sections of PEQ, 24 sections of PEQ +7 sections PEQ TARGET, 17 sections of PEQ + FIR and 10 sections of PEQ +7 sections of PEQ TARGET + FIR.
Further, the first to eighth output transmission circuits each include an output booster, an output RMS compressor, an output peak limiter, an output hard limiter, an output delay, an output polarity selector, and an output mute, which are connected in sequence.
Further, the output frequency divider comprises four output frequency division types of a frequency division-IIR +8 sections of PEQ, a frequency division-MIR +8 sections of PEQ, a frequency division-FIR +8 sections of PEQ and a frequency division-IIR + FIR +4 sections of PEQ; the three output frequency division types of the frequency division-IIR +8 sections of PEQ, the frequency division-MIR +8 sections of PEQ and the frequency division-FIR +8 sections of PEQ respectively comprise 8 sections of PEQ filters, the frequency division-IIR + FIR +4 sections of PEQ output frequency division types comprise 4 sections of PEQ filters, and the four output frequency division types further comprise high/low pass filters.
Furthermore, the DSP audio signal processing module further comprises an FIR filter plug-in interface, a real-time spectrum analyzer plug-in interface and a high-order signal generator plug-in interface.
Further, the control interface module further comprises a USB control interface, an ethernet control interface and an RS485 control interface.
Furthermore, the audio signal processing device with adjustable frequency response further comprises a power supply module, and the power supply module is connected with the control interface module, the DSP audio signal processing module and the control interface module.
Furthermore, the audio signal processing device with adjustable frequency response further comprises a chassis.
Furthermore, an LCD control panel is arranged on the case and connected with the control interface module.
Above-mentioned the utility model discloses technical scheme in the embodiment has following advantage: the utility model discloses can carry out independent sampling analysis and processing to speaker unit feedback sound, export high-quality audio signal. The compression limiter ensures that the sound signal does not damage the internal speaker unit components; and simultaneously the utility model provides a all kinds of external connection interfaces, convenience of customers carry out individualized customization sound through the external component. The utility model discloses the function is abundant, convenient to use, the performance is powerful, and the wide application is in audio processing technology field.
Drawings
Fig. 1 is a top view of an audio signal processing apparatus with adjustable frequency response according to the present invention;
fig. 2 is an audio signal transmission route diagram of the audio signal processing device with adjustable frequency response of the present invention;
fig. 3 is a schematic diagram of the connection relationship among the audio signal transmission module, the DSP audio signal processing module, the control interface module and the power supply module of the audio signal processing apparatus with adjustable frequency response of the present invention;
fig. 4 is a schematic diagram of the external connection interface control DSP audio signal processing module of the audio signal processing apparatus with adjustable frequency response of the present invention;
fig. 5 is the internal connection relationship schematic diagram of the DSP audio signal processing module of the audio signal processing apparatus with adjustable frequency response of the present invention.
Reference numerals: 1. an analog audio input interface; 2. an analog audio output interface; 3, packaging positions of the DSP audio signal processing module, the control interface module and the audio signal transmission module; 4, an LCD control panel; 5. a mains supply input interface; 6. an Ethernet control interface; RS485 control interface; 8. a power supply module; and 9, a USB control interface.
Detailed Description
The invention will be further explained and explained with reference to the drawings and the embodiments in the following description.
This embodiment describes a structure of an audio signal processing apparatus with adjustable frequency response. The overall structure of the device is shown in fig. 1, and mainly comprises an audio signal transmission module, a DSP audio signal processing module, and a control interface module.
The control interface module comprises first to fourth analog audio input interfaces and first to eighth analog audio output interfaces; a 4 in 8 out effect is achieved.
The audio signal transmission module comprises an analog-to-digital conversion module and a digital-to-analog conversion module; the digital end of the analog-to-digital conversion module is connected with a first input transmission link, a second input transmission link, a third input transmission link and a fourth input transmission link of the DSP audio signal processing module; the digital end of the digital-to-analog conversion module is connected with the first output transmission link, the second output transmission link, the third output transmission link, the fourth output transmission link, the fifth output transmission link, the sixth output transmission link, the seventh output transmission link and the eighth output transmission link of the DSP audio signal processing module, and the analog end of the digital-to-analog conversion module is connected with the first analog audio output interface, the second analog audio output interface, the third analog audio output interface, the fourth analog audio output interface, the fifth analog audio output interface, the sixth analog audio output interface, the seventh analog audio output interface and the eighth analog audio output interface. The analog audio output interface is connected with a power amplifier (not shown in the embodiment).
In some embodiments of the present invention, the analog-to-digital conversion module employs a PCM4204 audio conversion chip of the TI company, whose performance supports 24-bit, 216kHz sampling, supports digital audio of differential input, and the signal-to-noise ratio reaches 118 dB.
In some embodiments of the present invention, the digital-to-analog conversion module employs a TI company PCM4220 audio conversion chip, whose performance supports 24 bits, 216kHz sampling, and the signal-to-noise ratio reaches 123dB, and supports hardware matching sampling frequency selection.
The DSP (Digital Signal Processing) audio Signal Processing module comprises an output frequency divider, first to fourth input transmission links, first to eighth output transmission links and a 4-in 8-out matrix. The first input transmission link, the second input transmission link, the third input transmission link and the fourth input transmission link are respectively connected to 4 input ends of a 4-in 8-out matrix; the output frequency divider has 8 input ports and 8 output ports, 8 input ports are connected with 8 output ends of the 4-input 8-output matrix, and 8 output ports are respectively connected to the first output transmission link, the second output transmission link, the third output transmission link, the fourth output transmission link, the fifth output transmission link, the sixth output transmission link, the seventh output transmission link and the eighth output transmission link.
In some embodiments of the present invention, the DSP audio signal processing module further comprises an input equalizer; the first through fourth input transmission links each include a noise gate processor, an input booster, an input mute, an input high/low frequency noise booster, an input RMS compressor, an input polarity selector, and an input delay connected in sequence; an input equalizer, which is an intermediate component of the first through fourth input transmission chains, is connected between the input frequency response booster and the input RMS compressor of the respective chain.
The first to eighth output transmission circuits each include an output booster, an output RMS compressor, an output peak limiter, an output hard limiter, an output delay, an output polarity selector, and an output mute connected in sequence.
The input/output gain device is used for increasing and decreasing the volume of an input/output channel, and the adjustable range reaches-18 dB to 12 dB.
The input/output delayer is used for delaying and outputting the input/output signal; the input adjustable range is 0 ms-300.989 ms, and the output adjustable range is 0 ms-150.989 ms. The utility model discloses an in some embodiments, the external linkage device of delay timer makes the user audio-visual when setting up the parameter, need not just can know the produced delay time of output signal contrast input signal with the help of external equipment, and convenience of customers postpones the matching to every output channel.
The input/output polarity selector is used for carrying out forward direction 'Normal' or reverse direction 'Invert' processing on an input signal.
The input high/low frequency response raiser is used for dynamically equalizing the audio signal according to the equal frequency response curve of human ears, thereby achieving the purpose of raising the frequency response.
Input/output RMS (Root Mean Square) compressor: the method is used for changing the proportion of input and output signals to realize the compression of the audio signal. The utility model discloses a part of embodiments, the compressor embeds has optional automatic compression, automatic inflection point, automatic compensation function.
Outputting a hard limiter: for constant rate limiting of signals exceeding a threshold.
Inputting an equalizer: the gain control circuit is used for independently regulating and controlling audio signals, and is adjustable within 20 Hz-20 kHz, gain of + -15dB and bandwidth of 0.4 oct-128 oct. Alternative types of equalizers include a snow Filter (filtering Filter), Bell Filter (Bell Filter), high/low pass Filter, band pass Filter, Notch Filter, All-pass Filter (All-pass Filter). The input equalizer also comprises a temporary storage and calling setting comparison function (the user can set in the same equalizer mode, carry out equalizer setting, can set and store A, set and store B, call A and B at any time during tuning to compare and carry out equalization adjustment, and select the optimal setting). The input equalizer comprises 4 optional modes: 31PEQ (Parametric Equalizer), 7PEQ TARGET +24PEQ, 17PEQ + FIR, 7PEQTARGET +10PEQ + FIR, each FIR (non-recursive filter) mode provides a FIR filter with a sampling rate of 48kHz with 512 taps, which can be customized to generate the required FIR convolution for the preset content of the loudspeaker using third party software to improve the phase Response and control the directivity according to the requirement.
Inputting a frequency divider: the system comprises four optional frequency division types of IIR (Infinite Impulse Response, recursive filter) +8 sections of PEQ and MIR (Marani Impulse Response, Marani filter) +8 sections of PEQ, FIR +8 sections of PEQ and IIR + FIR +4 sections of PEQ; each type of frequency division contains 8-segment PEQ filters and high/low pass filters, with optional filters including linkutz-rayleigh (Linkwitz-Riley) filters, Bessel (Bessel) filters, Butterworth (Butterworth) filters, and Marani brand NXF corner-shaped filters. Each FIR mode provides a 512 tap 48kHz sampling rate FIR filter, which can be customized using third party software to generate the required FIR convolution for speaker presets to improve phase response and control directivity as desired.
The utility model discloses a partial embodiment, DSP audio signal processing module still includes FIR wave filter plug-in components interface, real-time spectrum analysis appearance plug-in components interface and high order signal generator plug-in components interface. Inserting a corresponding plug-in provides more function options for detecting and feeding back data and analyzing the sound field of the amplifier unit during tuning test, thereby achieving the optimal effect.
In some embodiments of the present invention, the processor of the DSP audio signal processing module adopts SAM5000 series DSP chips of DREAM corporation; the MCU adopts STM32F407VET6 chip of ST company, and supports external four-wire SPI (Serial Peripheral interface) to control and configure parameters, and also supports online programming simulation, and uses graphic tool to develop and program.
In some embodiments of the present invention, the control interface module further comprises a USB control interface, an ethernet control interface and an RS485 control interface. These interfaces are used for data interactive communication with external devices, such as IAP firmware online upgrade through a network control interface and simultaneous grouping of 32 audio signal processing devices, and parameters such as gain, mute, PEQ, polarity and the like are set, so that a user can operate multiple devices at the same time.
The utility model discloses a partial embodiment still includes the power supply module, and the power supply module is connected with control interface module, DSP audio signal processing module and control interface module, provides stable +/-15V, +5.8V, +5V power, and switching power supply has the sensitive protection mechanism of overcurrent, excessive pressure, high temperature.
In some embodiments of the present invention, the device further comprises a case. The case is provided with an LCD control panel which is connected with the control interface module. The MCU of the LCD control panel can be an AT32F415RBT7 chip of AT company.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (10)
1. An audio signal processing apparatus with adjustable frequency response, characterized by: the device comprises an audio signal transmission module, a DSP audio signal processing module and a control interface module;
the control interface module comprises a first analog audio input interface, a second analog audio input interface, a third analog audio input interface, a fourth analog audio input interface, a first analog audio output interface, a second analog audio output interface, a third analog audio output interface, a fourth analog audio output interface, a fifth analog audio output interface, a sixth analog audio output interface, a seventh analog audio output interface and an eighth analog audio output interface;
the audio signal transmission module comprises an analog-to-digital conversion module and a digital-to-analog conversion module; the digital end of the analog-to-digital conversion module is connected with a first input transmission link, a second input transmission link, a third input transmission link and a fourth input transmission link of the DSP audio signal processing module; a digital end of the digital-to-analog conversion module is connected with a first output transmission link, a second output transmission link, a third output transmission link, a fourth output transmission link, a fifth output transmission link, a sixth output transmission link, a seventh output transmission link and an eighth output transmission link of the DSP audio signal processing module, and an analog end of the digital-to-analog conversion module is connected with a first analog audio output interface, a second analog audio output interface, a third analog audio output interface, a fourth analog audio output interface, a fifth analog audio output interface, a sixth analog audio output interface, a seventh analog audio output interface and an eighth analog audio output interface;
the DSP audio signal processing module comprises an output frequency divider, a first input transmission link, a second input transmission link, a third input transmission link, a fourth input transmission link, a first output transmission link, a second output transmission link, a third output transmission link, a fourth output transmission link, a fifth output transmission link, a sixth output transmission link, a seventh output transmission link, an eighth output transmission link and a 4-in-8-out matrix; the first input transmission link, the second input transmission link, the third input transmission link and the fourth input transmission link are respectively connected to 4 input ends of a 4-in 8-out matrix; the output frequency divider has 8 input ports and 8 output ports, 8 input ports are connected with 8 output ends of the 4-input 8-output matrix, and 8 output ports are respectively connected to the first output transmission link, the second output transmission link, the third output transmission link, the fourth output transmission link, the fifth output transmission link, the sixth output transmission link, the seventh output transmission link and the eighth output transmission link.
2. The audio signal processing apparatus according to claim 1, wherein: the DSP audio signal processing module also comprises an input equalizer; the first through fourth input transmission links each comprise a noise gate processor, an input booster, an input mute, an input high/low frequency noise booster, an input RMS compressor, an input polarity selector, and an input delay connected in sequence; an input equalizer, which is an intermediate component of the first through fourth input transmission chains, is connected between the input frequency response booster and the input RMS compressor of the respective chain.
3. The audio signal processing apparatus according to claim 2, wherein: the input equalizer comprises four working modes of 31 sections of PEQ, 24 sections of PEQ +7 sections of PEQ TARGET, 17 sections of PEQ + FIR and 10 sections of PEQ +7 sections of PEQTARGET + FIR.
4. The audio signal processing apparatus according to claim 1, wherein: the first to eighth output transmission circuits respectively comprise an output gain device, an output RMS compressor, an output peak amplitude limiter, an output hard amplitude limiter, an output time delay device, an output polarity selector and an output mute which are connected in sequence.
5. The audio signal processing apparatus according to claim 1, wherein: the output frequency divider comprises four output frequency division types of a frequency division-IIR +8 sections of PEQ, a frequency division-MIR +8 sections of PEQ, a frequency division-FIR +8 sections of PEQ and a frequency division-IIR + FIR +4 sections of PEQ; the three output frequency division types of the frequency division-IIR +8 sections of PEQ, the frequency division-MIR +8 sections of PEQ and the frequency division-FIR +8 sections of PEQ respectively comprise 8 sections of PEQ filters, the frequency division-IIR + FIR +4 sections of PEQ output frequency division types comprise 4 sections of PEQ filters, and the four output frequency division types further comprise high/low pass filters.
6. The audio signal processing apparatus according to claim 1, wherein: the DSP audio signal processing module further comprises an FIR filter plug-in interface, a real-time spectrum analyzer plug-in interface and a high-order signal generator plug-in interface.
7. The audio signal processing apparatus according to claim 1, wherein: the control interface module also comprises a USB control interface, an Ethernet control interface and an RS485 control interface.
8. The audio signal processing apparatus according to claim 1, wherein: the audio signal processing equipment with the adjustable frequency response further comprises a power supply module, and the power supply module is connected with the control interface module, the DSP audio signal processing module and the control interface module.
9. An audio signal processing device with adjustable frequency response according to any one of claims 1-8, characterized in that: the audio signal processing equipment with the adjustable frequency response further comprises a case.
10. The audio signal processing apparatus according to claim 9, wherein: the case is provided with an LCD control panel which is connected with the control interface module.
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| CN202220372305.5U CN217116364U (en) | 2022-02-23 | 2022-02-23 | Audio signal processing equipment with adjustable frequency response |
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