How to measure the frequency characteristics of a compact speaker simply and quickly in a mobile phone etc.
The following measurement methods are generally used for easily evaluating the sound characteristics of speakers including mobile phones and other audio equipment.
• Sound pressure level measurement of the sound output from a speaker
• Checking the frequency characteristics of a speaker
• Pass/fail judgment based on the measurement result
The sound pressure level of a certain specified frequency can be measured with only the sound level meter. But when measuring the frequency characteristics of changing frequency, sound level meter and FFT Analyzer are used in combination.
Keys to success
・When the ambient sound affects the measurement, prepare an anechoic box etc.
・When the sweep time of the signal transmitter is too fast, measurement data will be affected.
Please perform trial test and check the optimum sweep time with actual machine.
・For real-time analysis, when you use the signal output function (option) of the FFT analyzer instead of the signal
generator, the sine sweep is performed in conjunction with the FFT analysis, making it easier to measure.
The followings are 5 examples of product combination system when measuring frequency characteristics.
| Method | No. | Major products used | |||
|---|---|---|---|---|---|
| Real-time Analysis | 1 |
DS-3000 series  |
PC | Amplifier | |
| 2 |
 |
Transmitter | Amplifier | ||
| Offline Analysis | 3 | OS-2000 series  |
Transmitter | PC | |
| Further Analysis | 4 |
 |
Transmitter | PLC | |
| 5 |
 |
Microphone & its amplifier |
PLC | 2ch Sensor Amplifier | |
Revised:2018/10/31
