中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

9 records (took 0.027 seconds)

    ARTIFICIAL EAR FOR TELEPHONOMETRIC MEASUREMENTS
    3.
    发明专利
    ARTIFICIAL EAR FOR TELEPHONOMETRIC MEASUREMENTS 未知

    公开(公告)号：CA1100621A

    公开(公告)日：1981-05-05

    申请号：CA298428

    申请日：1978-03-07

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： MODENA GIULIO ,  REOLON ALDO

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

    Abstract: This invention relates to an artificial ear which has been designed for telephone use so as to exactly reproduce the conditions of acoustical load present during a usual telephone call and to take into account the characteristics of a sound source produced by a microtelephone. This invention provides an artificial ear for telephononmetric measurements comprising a microphone and an acoustical network consisting of an entrance cavity housing the microphone and of a set of further cavities communicating with the first cavity, wherein said acoustical network is structured in such a way as to reproduce at the entrance of the microphone the same impedance as the acoustic impedance presented by the human ear at a telephone receiver under usual conditions, with acoustical leakage between the outer rim of the ear and the receiver.

    5.
    发明专利
    未知

    公开(公告)号：DE2809634A1

    公开(公告)日：1978-09-14

    申请号：DE2809634

    申请日：1978-03-06

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： MODENA GIULIO ,  REOLON ALDO

    IPC: G10L11/00 ,  G01H3/00 ,  G01H17/00 ,  H04M1/24 ,  H04R1/22 ,  H04R29/00 ,  A61B5/12

    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.

    9.
    发明专利
    未知

    公开(公告)号：FR2383573A1

    公开(公告)日：1978-10-06

    申请号：FR7805973

    申请日：1978-03-02

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： MODENA GIULIO ,  REOLON ALDO

    IPC: G10L11/00 ,  G01H3/00 ,  G01H17/00 ,  H04M1/24 ,  H04R1/22 ,  H04R29/00 ,  H04R11/02 ,  G01H9/00

    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.

Patent Agency Ranking