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Teilbandkodierung 次頻帶編碼 Sub-band coding
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Die Teilbandkodierung (bzw. engl. sub-band coding) ist eine auf dem shannonsschen Abtasttheorem basierende Technik zur Audiodatenkompression. Dabei wird das digitale Signal in verschiedene Frequenzbänder aufgeteilt. Jedes Teilband wird abhängig von seinem Signalpegel kodiert. Dadurch gehen vorrangig vom Ohr nicht wahrnehmbare Signalanteile verloren (Maskierungseffekt, das heißt von lauten Tönen überlagerte sehr leise Töne).Teilbandkodierung wird unter anderem für die Kodierung nach den MPEG-Audiostandards (zum Beispiel MP3, MPEG-1) verwendet. 在訊號處理中,次頻帶編碼(sub-band coding, SBC)是一種轉換編碼。其作法是把訊號分成許多頻帶(通常使用快速傅里叶变换)後獨立編碼,通常是將資料做壓縮的第一步,可應用於聲音、多媒體、影像訊號的壓縮。 次频带编码常用于包括MP3算法在内的许多常见有损音频压缩算法中。 In signal processing, sub-band coding (SBC) is any form of transform coding that breaks a signal into a number of different frequency bands, typically by using a fast Fourier transform, and encodes each one independently. This decomposition is often the first step in data compression for audio and video signals. SBC is the core technique used in many popular lossy audio compression algorithms including MP3.
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Die Teilbandkodierung (bzw. engl. sub-band coding) ist eine auf dem shannonsschen Abtasttheorem basierende Technik zur Audiodatenkompression. Dabei wird das digitale Signal in verschiedene Frequenzbänder aufgeteilt. Jedes Teilband wird abhängig von seinem Signalpegel kodiert. Dadurch gehen vorrangig vom Ohr nicht wahrnehmbare Signalanteile verloren (Maskierungseffekt, das heißt von lauten Tönen überlagerte sehr leise Töne).Teilbandkodierung wird unter anderem für die Kodierung nach den MPEG-Audiostandards (zum Beispiel MP3, MPEG-1) verwendet. 在訊號處理中,次頻帶編碼(sub-band coding, SBC)是一種轉換編碼。其作法是把訊號分成許多頻帶(通常使用快速傅里叶变换)後獨立編碼,通常是將資料做壓縮的第一步,可應用於聲音、多媒體、影像訊號的壓縮。 次频带编码常用于包括MP3算法在内的许多常见有损音频压缩算法中。 In signal processing, sub-band coding (SBC) is any form of transform coding that breaks a signal into a number of different frequency bands, typically by using a fast Fourier transform, and encodes each one independently. This decomposition is often the first step in data compression for audio and video signals. SBC is the core technique used in many popular lossy audio compression algorithms including MP3.
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