Multi-channel audio test system

Abstract

The utility model discloses a multichannel audio test system, which comprises an audio analyzer, a multichannel switching unit, a plurality of sound production units and a plurality of pickup units, audio signals are output to the sound production units of corresponding channels one by one through the multichannel switching unit, the sound production units are driven to produce sound, and the sound is picked up by the corresponding pickup units. And the pickup units output sound signals obtained through pickup to the audio analyzer, so that performance testing of the plurality of sound production units and / or the plurality of pickup units is realized. According to the utility model, the test efficiency and the test precision of the multi-channel audio test are improved, and the multi-channel test requirements of a loudspeaker array, a parametric array loudspeaker array, a microphone array and the like are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to audio frequency test technical field, concretely relates to a multi -channel audio frequency test system. BACKGROUND

[0002] In the manufacturing and research and development process of electroacoustic devices (such as loudspeaker, microphone), its performance test is the key link to ensure that the product meets the design index.The traditional test method usually carries out item-by-item test to the device through single signal input / output channel.

[0003] However, with the improvement of high-precision, high-efficiency and automated production demand, the above-mentioned single-channel test mode has the problem of low test efficiency, because single-channel test needs to connect and detect each test unit one by one, especially in batch production scene, frequent manual switching and equipment resetting lead to long test period and high labor cost, which is difficult to meet the high-speed rhythm requirement of modern production line, and also difficult to meet the multi-channel test requirement of loudspeaker array, parametric array loudspeaker array and microphone array.

[0004] Therefore, it is necessary to improve the existing single-channel test mode to meet the multi-channel test requirement of loudspeaker array, parametric array loudspeaker array and microphone array. CONTENT OF UTILITY MODEL

[0005] The utility model aims at providing a multi -channel audio frequency test system that realizes the test to multiple sound production and / or sound pickup channels.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a multi -channel audio frequency test system, comprising:

[0007] Audio analyzer, for outputting audio signal;

[0008] Multi-channel switching unit, connected with the audio analyzer, comprising multiple switching channels, for switching output of the audio signal through switching channel one by one;

[0009] Multiple sound production units, connected with the multi-channel switching unit, and each sound production unit is connected with one switching channel, for sound production under the drive of audio signal;

[0010] Multiple sound pickup units, each sound pickup unit corresponds to one sound production unit, and each sound pickup unit is connected with the audio analyzer;

[0011] Audio signal is output to the sound production unit of corresponding channel one by one through multi-channel switching unit, drives sound production unit to sound and is picked up by corresponding sound pickup unit, and the sound signal picked up by sound pickup unit is output to audio analyzer, so as to realize the performance test to multiple sound production units and / or multiple sound pickup units.

[0012] In a preferred embodiment, the system further comprises a power amplifier connected between the audio analyzer and the multi-channel switching unit, or connected between the multi-channel switching unit and the sound emitting unit, for amplifying and outputting the audio signal.

[0013] In a preferred embodiment, the switching channel is a switching switch, and / or the multi-channel switching unit is a relay.

[0014] In a preferred embodiment, the plurality of sound emitting units is a loudspeaker array comprising a plurality of sound emitting channels or a parametric array loudspeaker array.

[0015] In a preferred embodiment, the parametric array loudspeaker array is a transparent electrostatic ultrasonic transducer, and the electrostatic ultrasonic transducer is divided into a plurality of sub-zones, each sub-zone forming a sound emitting channel.

[0016] In a preferred embodiment, the system further comprises a power supply for power supply, the power supply is connected between the pickup unit and the audio analyzer; and / or the system further comprises a control host connected to the audio analyzer.

[0017] In a preferred embodiment, the center of each sound emitting unit is aligned with the center of the corresponding pickup unit.

[0018] In a preferred embodiment, the power supply and the audio analyzer are connected through a BNC connection line, and the power supply and the pickup unit are connected through a BNC connection line.

[0019] In a preferred embodiment, the audio analyzer and the power amplifier are connected through a male-female connector connection line.

[0020] In a preferred embodiment, the control host and the audio analyzer are connected through a USB data connection line.

[0021] Compared with the prior art, the utility model has the advantages that: the utility model realizes performance testing of multi-channel sound emitting units (such as loudspeaker arrays or parametric array loudspeaker arrays) and / or testing and calibration of multi-channel pickup units (such as microphone arrays) by adding a plurality of switching channels, improves testing efficiency and testing precision, and meets the multi-channel testing requirements of loudspeaker arrays, parametric array loudspeaker arrays and microphone arrays. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a principle block diagram of the multi-channel audio testing system of the utility model;

[0023] Figure 2The utility model discloses a principle block diagram of a multi-channel audio test system in a specific embodiment. DETAILED DESCRIPTION

[0024] The utility model discloses a specific embodiment of the utility model is described in detail below, but it should be understood that the protection scope of the utility model is not limited by the specific embodiment.

[0025] Unless otherwise explicitly indicated, throughout the specification and claims, the term "comprise" or its variants such as "comprises" or "comprising" will be understood to encompass the stated element or elements or components, but not to exclude the presence of other element or elements or components.

[0026] As Figure 1 The utility model discloses a multi-channel audio test system, specifically includes audio analyzer, multi-channel switching unit, a plurality of sounding unit and a plurality of pickup unit, wherein, audio signal is output through audio analyzer, and is output to the sounding unit of corresponding channel through multi-channel switching unit one by one, drives the sounding unit to sound and is picked up through the pickup unit of corresponding, and the pickup unit is output to the audio signal of audio analyzer, realizes the performance test of a plurality of sounding unit and / or a plurality of pickup unit.

[0027] Specifically, the audio analyzer is connected with the multi-channel switching unit, and is used for outputting the audio signal, and in implementation, specifically can adopt the audio analyzer of model FX-100. Further, as Figure 2 The utility model discloses a test system can also include power amplifier, and in implementation, power amplifier can be connected between the audio analyzer and the multi-channel switching unit, can also be connected between the multi-channel switching unit and the sounding unit, and is used for outputting after amplifying and converting the audio signal. In a specific embodiment, power amplifier can be connected between the audio analyzer and the multi-channel switching unit, as Figure 2 The utility model discloses a test system can also include power amplifier, and in implementation, power amplifier can be connected between the audio analyzer and the multi-channel switching unit, can also be connected between the multi-channel switching unit and the sounding unit, and is used for outputting after amplifying and converting the audio signal. In a specific embodiment, power amplifier can be connected between the audio analyzer and the multi-channel switching unit, as

[0028] The multi-channel switching unit is used for switching the audio signals one by one. Specifically, the multi-channel switching unit includes a plurality of switching channels, the number of switching channels is the same as the number of sound generating units, and one switching channel corresponds to one sound generating unit. The audio signals are switched one by one through the corresponding switching channel and output to the corresponding sound generating unit. For example, if the number of sound generating units is 8, the number of switching channels is also 8. If the audio signals are to be output to the first sound generating unit, the audio signals are output to the first sound generating unit through the first switching channel, and so on. In implementation, the switching channel can be realized by a switching switch. The audio signals are output through the corresponding switching channel by controlling the on-off of the switching switch. The multi-channel switching unit as a whole can be realized by a relay.

[0029] The plurality of sound generating units are connected to the multi-channel switching unit. Each sound generating unit is driven by the amplified and converted audio signals output through the corresponding switching channel to generate sound. In implementation, the plurality of sound generating units can be a loudspeaker array including a plurality of sound generating channels or a parametric array loudspeaker array. For example, the loudspeaker array is formed by a plurality of loudspeakers arranged in an array, and each loudspeaker is a sound generating channel. For another example, the loudspeaker array is a transparent electrostatic ultrasonic transducer, and the electrostatic ultrasonic transducer is divided into a plurality of sub-zones arranged in an array, and each sub-zone is a sound generating channel.

[0030] The number and position of the plurality of sound generating units correspond to the number and position of the plurality of sound generating units, i.e., one sound generating unit corresponds to one sound generating unit. Preferably, the center of each sound generating unit is aligned with the center of the corresponding sound generating unit, and is used for sound pickup of the sound generated by each sound generating unit. In implementation, the plurality of sound generating units can be a microphone array arranged in an array. For example, when the plurality of sound generating units are a loudspeaker array and the plurality of sound generating units are a microphone array, and the performance of the plurality of loudspeakers of the loudspeaker array is tested, the to-be-tested loudspeaker and the microphone are built in a free sound field environment, the to-be-tested loudspeaker is placed on a test platform confirmed by a level meter, the test microphone is kept horizontal and aligned with the center position of the diaphragm of the to-be-tested loudspeaker, the height of the to-be-tested loudspeaker and the microphone to the ground is controlled to be between 1.2-1.5 meters, for example, 1.3 meters, the to-be-tested loudspeaker and the microphone are kept at a distance of 1 meter, and the loudspeaker array is 5 meters.

[0031] The plurality of sound generating units are connected to the multi-channel switching unit. Each sound generating unit is driven by the amplified and converted audio signals output through the corresponding switching channel to generate sound. In implementation, the plurality of sound generating units can be a loudspeaker array including a plurality of sound generating channels or a parametric array loudspeaker array. For example, the loudspeaker array is formed by a plurality of loudspeakers arranged in an array, and each loudspeaker is a sound generating channel. For another example, the loudspeaker array is a transparent electrostatic ultrasonic transducer, and the electrostatic ultrasonic transducer is divided into a plurality of sub-zones arranged in an array, and each sub-zone is a sound generating channel. Figure 2As shown, the system further comprises a power supply connected between the multiple pickup units and the audio analyzer, for supplying power to each unit of the system.

[0032] In addition, as shown, Figure 2 As shown, the system further comprises a control host (PC) connected to the audio analyzer, and the audio analyzer and the multi-channel switching unit work under the control of the control host. In implementation, the control host and the audio analyzer are connected through a USB data connection line, for example, the FX-100 audio analyzer and the control host are connected through a USB2.0B male line.

[0033] The system can test the performance of the sound generating unit (such as frequency response, distortion, sound pressure level, etc.), and can also test the performance of the pickup unit. For example, the voltage of the pickup unit can be calibrated to ensure that the voltage and other performance parameters of the multiple pickup units are consistent before testing the sound generating unit, thereby ensuring the accuracy of the subsequent performance test of the sound generating unit. In addition, the voltage of each sound generating unit can be adjusted by adjusting the gain of the power amplifier, for example, the voltage of the multiple sound generating units is adjusted to be consistent, and the gain (AMP GAIN) of the power amplifier can be adjusted as needed and the actual output voltage of the power amplifier is measured by an oscilloscope, so that the actual output voltage of the power amplifier is adjusted to the required voltage. In addition, preferably, when testing the parametric array loudspeaker array, it is necessary to block the ultrasonic carrier to reduce the interference of the ultrasonic on the microphone front metal mesh cover and affect the test results. For example, when a 25μm thick and 2.5 inch diameter pleated polyester film (to prevent mirror reflection) is placed in front of the microphone, the ultrasonic sound pressure level in the frequency range of 35kHz-85kHz can be effectively reduced by more than 25dB, and the audible sound frequency band below 10kHz is only reduced by about 1dB. The test interference of the ultrasonic on the microphone is reduced, and the test attenuation of the audible sound frequency band is not affected.

[0034] The utility model has the advantages that the utility model realizes the performance test of the multi-channel sound generating unit (such as loudspeaker array or parametric array loudspeaker array) and / or the test and calibration of the multi-channel pickup unit (such as microphone array) by adding multiple switching channels, improves the test efficiency and test precision, and meets the multi-channel test demand of the loudspeaker array, parametric array loudspeaker array and microphone array.

[0035] The foregoing description of specific exemplary embodiments of the present application is intended to be illustrative only and is not intended to limit the application to the precise forms disclosed. Many modifications and variations are possible in light of the above teachings without departing from the spirit or essential characteristics of the application. The exemplary embodiments were chosen and described in order to explain the principles of the application and its practical application and to allow others skilled in the art to understand the application for various exemplary embodiments with various modifications being applicable. The scope of the application is intended to be defined by the claims and their equivalents.

Claims

1. A multi-channel audio test system, characterized by, The system comprises: an audio analyzer for outputting an audio signal; a multi-channel switching unit connected to the audio analyzer, comprising a plurality of switching channels for outputting the audio signal through the switching channels one by one; a plurality of sound generating units connected to the multi-channel switching unit, each of the sound generating units being connected to one of the switching channels for generating sound under the drive of the audio signal; a plurality of sound pickup units, each of the sound pickup units corresponding to one of the sound generating units, and each of the sound pickup units being connected to the audio analyzer; the audio signal is output through the multi-channel switching unit to the sound generating unit of the corresponding channel, the sound generating unit is driven to generate sound and is picked up by the corresponding sound pickup unit, the sound pickup unit outputs the sound signal picked up to the audio analyzer, and the performance test of the plurality of sound generating units and / or the plurality of sound pickup units is realized.

2. A multi-channel audio test system as claimed in claim 1, characterized in that, The system further comprises a power amplifier connected between the audio analyzer and the multi-channel switching unit, or connected between the multi-channel switching unit and the sound generating unit, for outputting the audio signal after amplification and conversion.

3. A multi-channel audio test system as claimed in claim 1, characterized in that, The switching channel is a switching switch, and / or the multi-channel switching unit is a relay.

4. A multi-channel audio testing system as recited in claim 1, wherein, The plurality of sound generating units are a loudspeaker array comprising a plurality of sound generating channels or a parametric array loudspeaker array.

5. A multi-channel audio testing system as claimed in claim 4, characterized in that, The parametric array loudspeaker array is a transparent electrostatic ultrasonic transducer, and the electrostatic ultrasonic transducer is divided into a plurality of sub-zones, each sub-zone forming one of the sound generating channels.

6. A multi-channel audio testing system as recited in claim 1, wherein, The system further comprises a power supply for power supply, the power supply being connected between the sound pickup unit and the audio analyzer; and / or the system further comprises a control host connected to the audio analyzer.

7. A multi-channel audio testing system as recited in claim 1, wherein, The center of each of the sound generating units is aligned with the center of the corresponding sound pickup unit.

8. A multi-channel audio testing system as claimed in claim 6, characterized in that, The power supply and the audio analyzer are connected through a BNC connecting line, and the power supply and the sound pickup unit are connected through a BNC connecting line.

9. A multi-channel audio testing system as defined in claim 2, wherein, The audio analyzer and the power amplifier are connected through a male-female connector connecting line.

10. A multi-channel audio testing system as defined in claim 6, wherein, The control host and the audio analyzer are connected through a USB data connecting line.

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