公开(公告)号：JPS547805A

公开(公告)日：1979-01-20

申请号：JP7227178

申请日：1978-06-16

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GIURIO MODENA ,  SUTEFUANO SANDORI ,  KARURO SUKAGURIORA

IPC: G10L13/00 ,  G10L11/00 ,  G10L19/00 ,  H04M1/24

公开(公告)号：JPS53110879A

公开(公告)日：1978-09-27

申请号：JP2288278

申请日：1978-03-02

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GIURIO MODENA ,  ARUDO REORON

IPC: G10L11/00 ,  G01H3/00 ,  G01H17/00 ,  H04M1/24 ,  H04R1/22 ,  H04R29/00

Abstract: A device to be used in phonometric measurements on telephone equipment, simulating a human ear, has a generally disk-shaped body with an annular ridge encompassing a frustoconical central recess serving as a wide-open entrance cavity. The body has several internal cavities communicating with the recess through restricted channels, namely a pair of major cavities resonant at low audio frequencies, an intermediate cavity resonant in the middle audio range, and a minor cavity resonant at high audio frequencies, the last-mentioned cavity having the shape of a narrow cylinder extending generally along the body axis. A microphone, connected to a measuring circuit, rises from the bottom of the recess to substantially the top level of the surrounding ridge to pick up incoming sounds at that level.