Method and device for searching according to speech based on artificial intelligence

Patent metadata

Field	Value
Publication number	US-10157619-B2
Application number	US-201715823663-A
Country	US
Kind code	B2
Filing date	Nov 28, 2017
Priority date	Nov 29, 2016
Publication date	Dec 18, 2018
Grant date	Dec 18, 2018

Abstract

A method and a device for searching according to a speech based on artificial intelligence are provided. The method includes: identifying an input speech of a user to determine whether the input speech is a child speech; filtrating a searched result obtained according to the input speech to obtain a filtrated searched result, if the input speech is the child speech; and feeding the filtrated searched result back to the user.

First claim

What is claimed is:

1. A method for searching according to a speech based on artificial intelligence, comprising:
acquiring, by at least one computing device, sample speeches for training a preset classifier;
removing, by the at least one computing device, a silent speech from the sample speeches by performing a speech activity detection on the sample speeches, to obtain training speeches;
extracting, by the at least one computing device, acoustic features of each training speech; and
training, by the at least one computing device, the preset classifier by inputting the acoustic features of the each training speech into the preset classifier, to obtain a target classifier;
identifying, by at least one computing device, an input speech of a user to determine whether the input speech is a child speech;
filtrating, by the at least one computing device, a searched result obtained according to the input speech to obtain a filtrated searched result, if the input speech is the child speech; and
feeding, by the at least one computing device, the filtrated searched result to the user,
wherein removing, by the at least one computing device, the silent speech from the sample speeches by performing a speech activity detection on the sample speeches, to obtain training speeches comprises:
dividing, by the at least one computing device, each sample speech into frames by a preset first step size, and removing, by the at least one computing device, the silent speech from each frame of the each sample speech by performing the speech activity detection on the each frame of the each sample speech, to obtain the each training speech;
wherein extracting, by the at least one computing device, the acoustic features of each training speech comprises:
dividing, by the at least one computing device, the each training speech by a preset second step size; and
extracting, by the at least one computing device, by a preset third step size, the acoustic features of the each training speech after dividing by the preset second step size.

2. The method according to claim 1 , wherein filtrating, by the at least one computing device, a searched result obtained according to the input speech comprises:
converting, by the at least one computing device, the input speech into a text content;
obtaining, by the at least one computing device, the searched result by searching according to the text content; and
filtrating, by the at least one computing device, the searched result to remove a sensitive content unsuitable for a child.

3. The method according to claim 2 , wherein obtaining, by the at least one computing device, the searched result by searching according to the text content comprises:
searching, by the at least one computing device, according to the text content in a first database pre-established for children; and
searching, by the at least one computing device, according to the text content in a second database to obtain the searched result, if no content related to the input speech is searched in the first database.

4. The method according to claim 1 , wherein identifying, by the at least one computing device, an input speech of a user to determine whether the input speech is a child speech comprises:
removing, by the at least one computing device, a silent speech from the input speech by performing the speech activity detection on the input speech, to obtain a tested speech;
extracting, by the at least one computing device, acoustic features of the tested speech; and
identifying, by the at least one computing device, the acoustic features of the tested speech by inputting the acoustic features of the tested speech into the target classifier, to determine whether the input speech is the child speech.

5. The method according to claim 4 , wherein
removing, by the at least one computing device, the silent speech from the input speech by performing the speech activity detection on the input speech, to obtain a tested speech comprises:
dividing, by the at least one computing device, the input speech into frames by a preset first step size, and removing, by the at least one computing device, the silent speech from each frame of the input speech by performing the speech activity detection on the each frame of the input speech, to obtain the tested speech;
extracting, by the at least one computing device, acoustic features of the tested speech comprises:
dividing, by the at least one computing device, the tested speech by a preset second step size; and
extracting, by the at least one computing device, by a preset third step size, the acoustic features of the tested speech after dividing by the preset second step size;
and, identifying, by the at least one computing device, the acoustic features of the tested speech by inputting the acoustic features of the tested speech into the target classifier, to determine whether the input speech is the child speech comprises:
grading, by the at least one computing device, the acoustic features of the tested speech by inputting the acoustic features of the tested speech into the target classifier;
acquiring, by the at least one computing device, an average value of the tested speech; and
determining, by the at least one computing device, that the input speech is the child speech if the average value is greater than a preset threshold.

6. A device for searching according to a speech based on artificial intelligence, comprising:
a processor; and
a memory, configured to store instructions executable by the processor, wherein the processor is configured to:
acquire sample speeches for training a preset classifier;
remove a silent speech from the sample speeches by performing a speech activity detection on the sample speeches, to obtain training speeches;
extract acoustic features of each training speech; and
train the preset classifier by inputting the acoustic features of the each training speech into the preset classifier, to obtain a target classifier;
identify an input speech of a user to determine whether the input speech is a child speech;
filtrate a searched result obtained according to the input speech to obtain a filtrated searched result, if the input speech is the child speech; and
feed the filtrated searched result to the user,
wherein the processor is configured to remove a silent speech from the sample speeches by performing a speech activity detection on the sample speeches, to obtain training speeches by acts of:
dividing each sample speech into frames by a preset first step size, and removing the silent speech from each frame of the each sample speech by performing the speech activity detection on the each frame of the each sample speech, to obtain the each training speech;
and the processor is configured to extract the acoustic features of each training speech by acts of:
dividing the each training speech by a preset second step size; and
extracting by a preset third step size, the acoustic features of the each training speech after dividing by the preset second step size.

7. The device according to claim 6 , wherein the processor is configured to filtrate the searched result obtained according to the input speech by acts of:
converting the input speech into a text content;
obtaining the searched result by searching according to the text content; and
filtrating the searched result to remove a sensitive content unsuitable for a child.

8. The device according to claim 7 , wherein the processor is configured to obtain the searched result by searching according to the text content by acts of:
searching according to the text content in a first database pre-established for children; and
searching according to the text content in a second database to obtain the searched result, if no

Assignees

• Baidu online network technology beijing co ltd

Inventors

• Li Chao
• Li Xiangang
• Sun Jue

Classifications

• G10L2025/786

  Adaptive threshold · CPC title

• G10L15/02

  Feature extraction for speech recognition; Selection of recognition unit · CPC title

• G10L25/27

  characterised by the analysis technique · CPC title

• G10L25/93

  Discriminating between voiced and unvoiced parts of speech signals (G10L25/90 takes precedence) · CPC title

• G10L25/30

  using neural networks · CPC title