公开(公告)号：US20210006899A1

公开(公告)日：2021-01-07

申请号：US16969273

申请日：2019-02-14

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Shoichiro SAITO ,  Kazunori KOBAYASHI ,  Akira NAKAGAWA ,  Noboru HARADA

IPC: H04R3/02 ,  G10L21/034 ,  H04R1/40 ,  H04R3/00 ,  H04M9/08 ,  H03G3/32

Abstract: A howling suppression apparatus includes: an integration processing part that obtains the maximum value among L values corresponding to n-th frames of L i-th signals, for i=1, 2, . . . , L, L being any integer equal to or greater than 2, the L i-th signals being frequency-domain signals obtained from sound signals collected by multiple microphones; and a howling suppression processing part that performs howling suppression processing on at least any of the L i-th signals using the maximum value.

公开(公告)号：US20230076338A1

公开(公告)日：2023-03-09

申请号：US17795851

申请日：2020-01-30

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Sachiko KURIHARA ,  Noboru HARADA ,  Masahiro FUKUI ,  Akira NAKAGAWA

IPC: G10L25/60 ,  H04R1/08 ,  H04R1/02 ,  H04R29/00

Abstract: The number of conversational tests needed for the evaluation of acoustic quality of the ICC system is reduced. An evaluation value conversion device 3 evaluates the quality of communication between a near-end acoustic region 100 and a far-end acoustic region 200 inside a vehicle for which a plurality of acoustic regions are predetermined. A voice signal picked up by a microphone M2 disposed in the far-end acoustic region 200 is emitted from a speaker S1 disposed in the near-end acoustic region 100. An objective evaluation value acquisition unit 33 acquires a first evaluation value by treating a voice signal obtained by combining a voice signal resulting from a first voice signal being emitted from a sound source in a seat belonging to the far-end acoustic region 200, picked up by the microphone M2, and emitted from the speaker S1 with a voice signal arriving at a seat belonging to the near-end acoustic region 100 as a result of the first voice signal being transmitted through the space inside the vehicle as an evaluation target sound, and treating the first voice signal as a reference sound. An evaluation value reuse unit 37 acquires the first evaluation value as an evaluation value of communication between a seat belonging to the near-end acoustic region 100 and a seat belonging to the far-end acoustic region 200.

公开(公告)号：US20200209842A1

公开(公告)日：2020-07-02

申请号：US16643916

申请日：2018-08-24

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yuma KOIZUMI ,  Yuta KAWACHI ,  Noboru HARADA ,  Shoichiro SAITO ,  Akira NAKAGAWA ,  Shin MURATA

IPC: G05B23/02 ,  G06N20/00

Abstract: Accuracy of unsupervised anomalous sound detection is improved using a small number of pieces of anomalous sound data. A threshold deciding part (13) calculates an anomaly score for each of a plurality of pieces of anomalous sound data, using a normal model learned with normal sound data and an anomaly model expressing the pieces of anomalous sound data, and decides a minimum value among the anomaly scores as a threshold. A weight updating part (14) updates, using a plurality of pieces of normal sound data, the pieces of anomalous sound data and the threshold, weights of the anomaly model so that all the pieces of anomalous sound data are judged as anomalous, and probability of the pieces of normal sound data being judged as anomalous is minimized.