Effect of Power Amplifier Distortion on the Speech Transmission Index for Public Address Systems
The effect of the power amplifier on speech intelligibility in public address systems is often marginalised – i.e. it is assumed that it does not introduce significant signal distortion. This approach is justified when the linear range of the amplifier is used. The large crest factor of the speech s...
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| Format: | Article |
| Language: | English |
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Institute of Fundamental Technological Research
2022-06-01
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| Series: | Archives of Acoustics |
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| Online Access: | https://journals.pan.pl/Content/123488/PDF/aoa.2022.141649.pdf |
| _version_ | 1797869244007841792 |
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| author | Paweł Dziechciński |
| author_facet | Paweł Dziechciński |
| author_sort | Paweł Dziechciński |
| collection | DOAJ |
| description | The effect of the power amplifier on speech intelligibility in public address systems is often marginalised – i.e. it is assumed that it does not introduce significant signal distortion. This approach is justified when the linear range of the amplifier is used. The large crest factor of the speech signal and economic considerations mean that the amplifier also works in the non-linear range. In this paper, the effect of power amplifier distortion on the speech transmission index for public address systems (STIPA) is presented. In the first step, this influence was evaluated by measurements for Class AB and D amplifiers. Then, a computer model of the public address system based on the direct STIPA method, taking into account the non-linear properties of the amplifier, was proposed. Using the computer model, the optimum amplifier driving values were determined taking into account the reverberation time and interfering noise. |
| first_indexed | 2024-04-10T00:08:29Z |
| format | Article |
| id | doaj.art-15178f5cc62b45bdb28ec038e4465ebb |
| institution | Directory Open Access Journal |
| issn | 0137-5075 2300-262X |
| language | English |
| last_indexed | 2024-04-10T00:08:29Z |
| publishDate | 2022-06-01 |
| publisher | Institute of Fundamental Technological Research |
| record_format | Article |
| series | Archives of Acoustics |
| spelling | doaj.art-15178f5cc62b45bdb28ec038e4465ebb2023-03-16T12:11:36ZengInstitute of Fundamental Technological ResearchArchives of Acoustics0137-50752300-262X2022-06-01vol. 47No 2191199https://doi.org/10.24425/aoa.2022.141649Effect of Power Amplifier Distortion on the Speech Transmission Index for Public Address SystemsPaweł Dziechciński0Department of Acoustics, Multimedia and Signal Processing, Wrocław University of Science and Technology, Wrocław, PolandThe effect of the power amplifier on speech intelligibility in public address systems is often marginalised – i.e. it is assumed that it does not introduce significant signal distortion. This approach is justified when the linear range of the amplifier is used. The large crest factor of the speech signal and economic considerations mean that the amplifier also works in the non-linear range. In this paper, the effect of power amplifier distortion on the speech transmission index for public address systems (STIPA) is presented. In the first step, this influence was evaluated by measurements for Class AB and D amplifiers. Then, a computer model of the public address system based on the direct STIPA method, taking into account the non-linear properties of the amplifier, was proposed. Using the computer model, the optimum amplifier driving values were determined taking into account the reverberation time and interfering noise.https://journals.pan.pl/Content/123488/PDF/aoa.2022.141649.pdfspeech transmission indexpower amplifierpublic address system |
| spellingShingle | Paweł Dziechciński Effect of Power Amplifier Distortion on the Speech Transmission Index for Public Address Systems Archives of Acoustics speech transmission index power amplifier public address system |
| title | Effect of Power Amplifier Distortion on the Speech Transmission Index for Public Address Systems |
| title_full | Effect of Power Amplifier Distortion on the Speech Transmission Index for Public Address Systems |
| title_fullStr | Effect of Power Amplifier Distortion on the Speech Transmission Index for Public Address Systems |
| title_full_unstemmed | Effect of Power Amplifier Distortion on the Speech Transmission Index for Public Address Systems |
| title_short | Effect of Power Amplifier Distortion on the Speech Transmission Index for Public Address Systems |
| title_sort | effect of power amplifier distortion on the speech transmission index for public address systems |
| topic | speech transmission index power amplifier public address system |
| url | https://journals.pan.pl/Content/123488/PDF/aoa.2022.141649.pdf |
| work_keys_str_mv | AT pawełdziechcinski effectofpoweramplifierdistortiononthespeechtransmissionindexforpublicaddresssystems |