Device and method for measuring impedance of loudspeaker

Abstract

The invention discloses a device for measuring impedance of a loudspeaker. The device comprises a detector, wherein one end of an output point of the detector is electrically connected with an anode of the loudspeaker to be measured after passing through a power amplifier; the other end of the output point of the detector is serially connected with a sampling resistor and electrically connected with a cathode of the loudspeaker to be measured; the two ends of an input point of the detector are electrically connected with the anode and the cathode of the loudspeaker to be measured respectively; and the two ends of the other input point of the detector are electrically connected with those of the sampling resistor respectively. The invention further discloses a method for measuring the impedance of the loudspeaker. The device and the method are convenient to operate and accurate in measurement results.

Description

technical field [0001] The invention relates to the technical field of loudspeaker quality inspection, in particular to a loudspeaker impedance measurement device and a measurement method thereof. Background technique [0002] With the development of the loudspeaker industry, some applications have higher and higher requirements on the quality of the loudspeaker. Therefore, it is an inevitable requirement of the industry to measure the performance parameters of loudspeakers accurately. [0003] Through the impedance curve of the loudspeaker, the parameters used for the design of the loudspeaker system can be derived, so the impedance curve of the loudspeaker is an important parameter next to the frequency response curve of the loudspeaker. [0004] The most convenient existing speaker impedance measurement method is the constant current method, that is, the speaker to be tested is connected in series with a relatively large resistance (such as a 1K ohm resistor), because th...

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Problems solved by technology

[0006] 2. When measuring the impedance curve of the speaker by the constant current method, the output is only an approximate constant current, the measurement result is not accurate, and there are measurement errors

[0007] 3. When measuring the impedance curve of the speaker by the constant current method, due to the large series impedance resistance, the output of the signal source is limited, so the current flowing through the speaker is also limited, and the final power added to the speaker is small, much smaller than that of the speaker. The actual use of the situation, making the measurement results inaccurate

[0008] 4. When the impedance curve of the speaker is measured by the constant current method, the power obtained by the speaker is limited, and the voltage on the speaker cannot be constant, so the frequency response curve of the speaker cannot be measured at the same time, and the frequency response curve of the speaker needs to be measured separately ,Time-consuming

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