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Wyszukujesz frazę "public address system" wg kryterium: Temat


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Tytuł:
Effect of Power Amplifier Distortion on the Speech Transmission Index for Public Address Systems
Autorzy:
Dziechciński, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2141647.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
speech transmission index
power amplifier
public address system
Opis:
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.speech transmission index; power amplifier; public address system.
Źródło:
Archives of Acoustics; 2022, 47, 2; 191-199
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of highpass filtering on the speech transmission index
Autorzy:
Dziechciński, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/24201998.pdf
Data publikacji:
2022
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
speech transmission index
STIPA
public address system
highpass filter
wskaźnik transmisji mowy
system nagłośnieniowy
filtry górnoprzepustowe
Opis:
Highpass filters are commonly used in the signal chain of public address systems. One of the reasons for using a highpass filter is to protect the loudspeaker from unwanted low-frequency signals. In addition, it can increase the intelligibility of speech. In this paper, the effect of the cutoff frequency and order of a highpass filter on the speech transmission index, the crest factor, and the sound level are presented. Analyses were performed for an ideal transmission channel, taking into account reverberation time, interfering noise, and high levels of sound. A computer model of the public address system developed by the author, based on the direct STIPA method, was used. This model enables analyses in the nonlinear range of power amplifier operation, which is often used in public address systems but is not considered in commercially available simulation programs.
Źródło:
Vibrations in Physical Systems; 2022, 33, 3; art. no. 2022306
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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