Speech intelligibility algorithm under noise and its train audio playback method and system

An audio playback and clarity technology, applied in speech analysis, instruments, sustainable transportation, etc., can solve problems such as inability to effectively improve the clarity of broadcast voices, passenger distress, and strong noise in the car, so as to improve the clarity of broadcast voices and avoid The effect of high SPL nuisance

Active Publication Date: 2022-07-15
TIANJIN BEIHAI COMM TECH
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AI Technical Summary

Problems solved by technology

[0003] On the one hand, in order to ensure the clarity of speech in a high-noise environment, the voice announcement system may be set with a relatively high volume, which is not only redundant in a low-noise environment, but may also cause trouble to some passengers;
[0004] On the other hand, the noise in the cabin is too strong in some sections, even if the system uses the maximum volume, it cannot effectively improve the clarity of the broadcast voice

Method used

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  • Speech intelligibility algorithm under noise and its train audio playback method and system
  • Speech intelligibility algorithm under noise and its train audio playback method and system

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Embodiment Construction

[0039] Attached to the following Figure 1-2 This application will be described in further detail.

[0040] The embodiment of the present application discloses a speech intelligibility algorithm under noise, which includes:

[0041] Establishing the impact of ambient noise on speech intelligibility The relational formula of influence: ; where subscript means the first frequency bands, is the weight coefficient of different frequency bands, Represents the degree of speech distortion, and K represents the masking effect of ambient noise on speech.

[0042] make, ;in, is the speech signal energy in the frequency band, is the standard value of normal speech energy.

[0043] make, ;in, is the equivalent noise power after considering the masking effect of ambient noise on speech.

[0044] At this point, D satisfies the formula:

[0045] ;

[0046] of which Also: ;

[0047] above, subscript means the first frequency bands, and define: , Both a...

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Abstract

The invention discloses a speech intelligibility algorithm under noise and a train audio playback method and system. The method includes: S101. Acquire noise audio collected by pickups pre-arranged in each car of the train; Audio stream, and do audio stream preprocessing; S102, analyze the noise audio based on the speech intelligibility algorithm under noise as claimed in claim 1; S103, adjust the energy of the speech signal in different frequency bands of the audio stream based on the analysis result of S102 distribution to obtain the audio stream after re-energy equalization; S104, each compartment collects noise audio, and executes S102-103 correspondingly; S105, each audio stream after re-energy equalization establishes a one-to-one correspondence with each compartment. The present application has the effect of enhancing the effect of voice broadcasting in the carriage and improving the experience of passengers.

Description

technical field [0001] The present application relates to the technical field of train audio playback, and in particular, to a speech intelligibility algorithm under noise and a train audio playback method and system. Background technique [0002] The subway is accompanied by non-steady-state noise during operation, and the sound pressure level in the carriage generally exhibits a wide range of dynamic changes. The noise will interfere with the voice announcement in the car in two ways: [0003] On the one hand, in order to ensure the clarity of speech in a high-noise environment, the voice announcement system may be set with a relatively high volume, which is not only redundant in a low-noise environment, but may also be troublesome to some passengers; [0004] On the other hand, in some sections, the noise in the cabin is too strong, even if the system adopts the maximum volume, it cannot effectively improve the clarity of the broadcast voice. [0005] In view of the abo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/02
CPCG10L21/02Y02T90/00
Inventor 张有利李跃群
Owner TIANJIN BEIHAI COMM TECH
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