|Frequency (Hz)||Upper limit (dB)||Lower limit (dB)|
All sensitivity values are expressed in dB on an arbitrary scale.
|Frequency (Hz)||Upper limit (dB)
8 ± 2 N
|Lower limit (dB)
8 ± 2 N
All sensitivity values are expressed in dB on an arbitrary scaleNOTE 2:
The basis for the target frequency responses in send and receive is the orthotelephonic reference response measured between 2 subjects 1 m apart under free-field conditions and assumes an ideal receive characteristic. Under these conditions the overall frequency response shows a rising slope. The present document no longer uses the ERP as the reference point for receive but the diffuse-field. With the concept of diffuse-field based receive measurements a rising slope for the overall frequency response is achieved by a flat target frequency response in send and a flat diffuse-field based receive frequency response.