Find the most up-to-date version of CEI EN at Engineering IEC Sound System Equipment – Part 7: Headphones and Earphones is an international standard intended to characterize the. IEC SOUND SYSTEM EQUIPMENT –- PART 7: HEADPHONES AND EARPHONES.
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The content you have requested is available only to registered visitors. Please complete the short form below all fields are required. No – I don’t want to receive the latest audio test information by email. Sound System Equipment — Part 7: Headphones and Earphones is an international standard intended to characterize the performance of headphones and earphones. The standard itself is a lengthy document, 9 Sections and 3 Annexes covering 46 printed pages.
Five separate sequences are provided, each designed to measure specific characteristics. This approach provides the user with the flexibility to measure all or some of the characteristics of their headphone.
BS EN – Sound system equipment. Headphones and earphones
It is recommended that the sequences be run directly from the IEC folder. The folder contains dependent files required to run the sequences. There are several unique Signal Paths used in the sequences which are not a part of the default SoundCheck installation. In order to add these Signal Paths to your System Calibration or relink to existing Signal Paths, you should open each of the sequences individually and, if prompted, add or relink Paths to your System Calibration.
If more than 4 input channels are available, all input signal paths may be assigned to separate hardware channels. This sequence satisfies the requirements of Section 8. The sequence prompts the operator to enter the rated voltage and rated impedance of the DUT. It then calculates the voltage required to produce 1 mW into the rated impedance.
The Hz recorded time waveforms are processed using heterodyne analysis to derive their fundamental values. The spectra are then power summed to derive a single SPL value and the Hz fundamentals are post processed to derive their SPL values. It then enters a loop which will run 5 times. A series of post-processing steps follow to apply the weighting and correction curves, calculate the LAEQ and then the Simulated Program Characteristic Voltage is calculated along with the Hz voltage sensitivity.
The data from each loop iteration is displayed as it is acquired. The sequence uses a stepped sine stimulus to measure frequency response, THD and impedance, a composite signal of 70 Hz and Hz with an amplitude ratio of 4: The user is first prompted to enter the rated voltage.
This value is converted 600268-7 dBV and used to calculate the IM and difference frequency stimulus levels. This sequence uses a pink noise stimulus to characterize the passive, active and total attenuation of noise cancelling headphones.
It can also be used to characterize the passive attenuation only of a standard non-ANC headphone. Noise speakers are set up adjacent to the HATS left and right ears.
Headphone Testing (Part 1): The Basics | audioXpress
First, a pink noise stimulus is played from the noise speakers and recorded by the unoccluded ears. A pink noise stimulus is played from the noise speakers and recorded by the occluded ears. The play and record acquisition takes place 3 times and the user is prompted to reposition the DUT on the HATS in between acquisitions. A statistics step calculates the mean of the 3 unoccluded measurements.
If the answer is No, the sequence jumps to post-processing steps which calculate passive attenuation and the final display step.
If the answer is Yes, the user is prompted to turn the ANC on and the sequence repeats the passive measurements. A series of post processing steps calculates the attenuation curves, their average values and shows them on the final display.
The sequence first plays a stepped sine through both channels of the DUT and captures 660268-7 sound radiation from the DUT using 2 reference mics.
BS EN 60268-7:2011
The sequence then goes through a series of acquisition steps to generate four fundamental curves which are then post-processed to calculate crosstalk.
Crosstalk and radiation curves are then shown on the final display. Registration required The content you have requested is available only to registered visitors. Hardware Requirements In 06268-7 to run the sequences, the following hardware is required: Software Requirements SoundCheck Setup System, Hardware ne Calibration Before attempting to run any of the sequences, read the following setup instructions.
Relink dialog Here is a list of sequences and their default signal paths unique paths are in ne Calibrate the headphone amplifier channels per the instructions in the SoundCheck manual. You are ready to start the sequence.
Headphone Voltage Sensitivity Final Display. Test Setup for measuring headphone voltage sensitivity. Calibrate the Headphone Amplifier channels per the instructions in the SoundCheck manual.
Connect the impedance boxes between the headphone amp out and headphone input. If passive, connect to the headphone amp or separate audio power amplifier You are ready to start the sequence.
Calibrate the microphones per the instructions in the SoundCheck manual. Once calibrated, position the microphones 0. FebDecember 17, – 3: Matthew Miller November 15, – 6: