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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Audio codec</span></span>
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<p>An <b>audio codec</b> is a device or computer program capable of encoding or decoding a digital data stream (a <a href="Codec" title="Codec">codec</a>) that encodes or decodes audio.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> In software, an audio codec is a computer program implementing an algorithm that <a href="Audio_compression_(data)" class="mw-redirect" title="Audio compression (data)">compresses and decompresses</a> digital audio data according to a given audio file or streaming media <a href="Audio_coding_format" title="Audio coding format">audio coding format</a>. The objective of the algorithm is to represent the high-fidelity audio signal with a minimum number of bits while retaining quality. This can effectively reduce the storage space and the <a href="Bandwidth_(computing)" title="Bandwidth (computing)">bandwidth</a> required for transmission of the stored audio file. Most software codecs are implemented as <a href="Library_(computing)" title="Library (computing)">libraries</a> which interface to one or more <a href="Media_player_(software)" class="mw-redirect" title="Media player (software)">multimedia players</a>. Most modern audio compression algorithms are based on <a href="Modified_discrete_cosine_transform" title="Modified discrete cosine transform">modified discrete cosine transform</a> (MDCT) coding and <a href="Linear_predictive_coding" title="Linear predictive coding">linear predictive coding</a> (LPC).
</p><p>In hardware, audio codec refers to a single device that encodes analog audio as digital signals and decodes digital back into analog. In other words, it contains both an <a href="Analog-to-digital_converter" title="Analog-to-digital converter">analog-to-digital converter</a> (ADC) and <a href="Digital-to-analog_converter" title="Digital-to-analog converter">digital-to-analog converter</a> (DAC) running off the same <a href="Clock_signal" title="Clock signal">clock signal</a>. This is used in <a href="Sound_card" title="Sound card">sound cards</a> that support both audio in and out, for instance. Hardware audio codecs send and receive digital data using <a href="Bus_(computing)" title="Bus (computing)">buses</a> such as <a href="AC'97" title="AC'97">AC'97</a>, <a href="SoundWire" class="mw-redirect" title="SoundWire">SoundWire</a>,<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> <a href="I%C2%B2S" title="I²S">I²S</a>, <a href="Serial_Peripheral_Interface_Bus" class="mw-redirect" title="Serial Peripheral Interface Bus">SPI</a>, <a href="I%C2%B2C" title="I²C">I²C</a>, etc. Most commonly the digital data is <a href="Linear_PCM" class="mw-redirect" title="Linear PCM">linear PCM</a>, and this is the only format that most codecs support, but some legacy codecs support other formats such as <a href="G.711" title="G.711">G.711</a> for telephony.
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<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="Comparison_of_audio_coding_formats" title="Comparison of audio coding formats">Comparison of audio coding formats</a></li>
<li><a href="List_of_codecs" title="List of codecs">List of codecs</a></li>
<li><a href="List_of_open-source_codecs" title="List of open-source codecs">List of open-source codecs</a></li>
<li><a href="Transcoding" title="Transcoding">Transcoding</a></li>
<li><a href="Video_codec" title="Video codec">Video codec</a></li></ul>
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<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.microsoft.com/windows/windowsmedia/player/faq/codec.mspx">"Using codecs"</a>. Microsoft<span class="reference-accessdate">. Retrieved <span class="nowrap">2009-12-21</span></span>.</cite></span>
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<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20150405161202/http://desktopvideo.about.com/od/glossary/g/codec.htm">"About.com - Codec"</a>. About.com. Archived from <a rel="nofollow" class="external text" href="http://desktopvideo.about.com/od/glossary/g/codec.htm">the original</a> on 2015-04-05<span class="reference-accessdate">. Retrieved <span class="nowrap">2009-12-21</span></span>.</cite></span>
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<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.afterdawn.com/glossary/terms/codec.cfm">"Glossary - Codec"</a>. Afterdawn.com<span class="reference-accessdate">. Retrieved <span class="nowrap">2009-12-21</span></span>.</cite></span>
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<li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20120219101738/https://help.ubuntu.com/8.04/musicvideophotos/C/codecs.html">"Ubuntu Documentation - What is a codec?"</a>. Ubuntu Documentation Team. Archived from <a rel="nofollow" class="external text" href="https://help.ubuntu.com/8.04/musicvideophotos/C/codecs.html">the original</a> on February 19, 2012<span class="reference-accessdate">. Retrieved <span class="nowrap">2009-12-21</span></span>.</cite></span>
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<li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.mipi.org/blog/mipi-soundwire-v1.2-boosts-flexibility-for-integrating-mobile-audio-interfaces">"MIPI SoundWire v1.2 | Integrating Mobile Audio Interfaces"</a>.</cite></span>
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<ul><li><a href="Adaptive_coding" title="Adaptive coding">Adaptive coding</a></li>
<li><a href="Arithmetic_coding" title="Arithmetic coding">Arithmetic</a></li>
<li><a href="Asymmetric_numeral_systems" title="Asymmetric numeral systems">Asymmetric numeral systems</a></li>
<li><a href="Golomb_coding" title="Golomb coding">Golomb</a></li>
<li><a href="Huffman_coding" title="Huffman coding">Huffman</a>
<ul><li><a href="Adaptive_Huffman_coding" title="Adaptive Huffman coding">Adaptive</a></li>
<li><a href="Canonical_Huffman_code" title="Canonical Huffman code">Canonical</a></li>
<li><a href="Modified_Huffman_coding" title="Modified Huffman coding">Modified</a></li></ul></li>
<li><a href="Range_coding" title="Range coding">Range</a></li>
<li><a href="Shannon_coding" title="Shannon coding">Shannon</a></li>
<li><a href="Shannon%E2%80%93Fano_coding" title="Shannon–Fano coding">Shannon–Fano</a></li>
<li><a href="Shannon%E2%80%93Fano%E2%80%93Elias_coding" title="Shannon–Fano–Elias coding">Shannon–Fano–Elias</a></li>
<li><a href="Tunstall_coding" title="Tunstall coding">Tunstall</a></li>
<li><a href="Unary_coding" title="Unary coding">Unary</a></li>
<li><a href="Universal_code_(data_compression)" title="Universal code (data compression)">Universal</a>
<ul><li><a href="Exponential-Golomb_coding" title="Exponential-Golomb coding">Exp-Golomb</a></li>
<li><a href="Fibonacci_coding" title="Fibonacci coding">Fibonacci</a></li>
<li><a href="Elias_gamma_coding" title="Elias gamma coding">Gamma</a></li>
<li><a href="Levenshtein_coding" title="Levenshtein coding">Levenshtein</a></li></ul></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Dictionary_coder" title="Dictionary coder">Dictionary</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Byte-pair_encoding" title="Byte-pair encoding">Byte-pair encoding</a></li>
<li><a href="LZ77_and_LZ78" title="LZ77 and LZ78">Lempel–Ziv</a>
<ul><li><a href="842_(compression_algorithm)" title="842 (compression algorithm)">842</a></li>
<li><a href="LZ4_(compression_algorithm)" title="LZ4 (compression algorithm)">LZ4</a></li>
<li><a href="LZJB" class="mw-redirect" title="LZJB">LZJB</a></li>
<li><a href="Lempel%E2%80%93Ziv%E2%80%93Oberhumer" title="Lempel–Ziv–Oberhumer">LZO</a></li>
<li><a href="LZRW" title="LZRW">LZRW</a></li>
<li><a href="Lempel%E2%80%93Ziv%E2%80%93Storer%E2%80%93Szymanski" title="Lempel–Ziv–Storer–Szymanski">LZSS</a></li>
<li><a href="Lempel%E2%80%93Ziv%E2%80%93Welch" title="Lempel–Ziv–Welch">LZW</a></li>
<li><a href="LZWL" title="LZWL">LZWL</a></li>
<li><a href="Snappy_(compression)" title="Snappy (compression)">Snappy</a></li></ul></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Burrows%E2%80%93Wheeler_transform" title="Burrows–Wheeler transform">BWT</a></li>
<li><a href="Context_tree_weighting" title="Context tree weighting">CTW</a></li>
<li><a href="Context_mixing" title="Context mixing">CM</a></li>
<li><a href="Delta_encoding" title="Delta encoding">Delta</a>
<ul><li><a href="Incremental_encoding" title="Incremental encoding">Incremental</a></li></ul></li>
<li><a href="Dynamic_Markov_compression" title="Dynamic Markov compression">DMC</a></li>
<li><a href="Differential_pulse-code_modulation" title="Differential pulse-code modulation">DPCM</a></li>
<li><a href="Grammar-based_code" title="Grammar-based code">Grammar</a>
<ul><li><a href="Re-Pair" title="Re-Pair">Re-Pair</a></li>
<li><a href="Sequitur_algorithm" title="Sequitur algorithm">Sequitur</a></li></ul></li>
<li><a href="Discrete_cosine_transform" title="Discrete cosine transform">LDCT</a></li>
<li><a href="Move-to-front_transform" title="Move-to-front transform">MTF</a></li>
<li><a href="PAQ" title="PAQ">PAQ</a></li>
<li><a href="Prediction_by_partial_matching" title="Prediction by partial matching">PPM</a></li>
<li><a href="Run-length_encoding" title="Run-length encoding">RLE</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Hybrid</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li>LZ77 + Huffman
<ul><li><a href="Deflate" title="Deflate">Deflate</a></li>
<li><a href="LZX" title="LZX">LZX</a></li>
<li><a href="Lempel%E2%80%93Ziv%E2%80%93Stac" title="Lempel–Ziv–Stac">LZS</a></li></ul></li>
<li>LZ77 + ANS
<ul><li><a href="LZFSE" title="LZFSE">LZFSE</a></li></ul></li>
<li>LZ77 + Huffman + ANS
<ul><li><a href="Zstd" title="Zstd">Zstandard</a></li></ul></li>
<li>LZ77 + Huffman + context
<ul><li><a href="Brotli" title="Brotli">Brotli</a></li></ul></li>
<li>LZSS + Huffman
<ul><li><a href="LHA_(file_format)" title="LHA (file format)">LHA/LZH</a></li></ul></li>
<li>LZ77 + Range
<ul><li><a href="LZMA" title="LZMA">LZMA</a></li>
<li>LZHAM</li></ul></li>
<li>RLE + BWT + MTF + Huffman
<ul><li><a href="Bzip2" title="Bzip2">bzip2</a></li></ul></li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Lossy_compression" title="Lossy compression">Lossy</a><br>type</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Transform_coding" title="Transform coding">Transform</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Discrete_cosine_transform" title="Discrete cosine transform">Discrete cosine transform</a>
<ul><li><a href="Discrete_cosine_transform" title="Discrete cosine transform">DCT</a></li>
<li><a href="Modified_discrete_cosine_transform" title="Modified discrete cosine transform">MDCT</a></li></ul></li>
<li><a href="Discrete_sine_transform" title="Discrete sine transform">DST</a></li>
<li><a href="Fast_Fourier_transform" title="Fast Fourier transform">FFT</a></li>
<li><a href="Wavelet_transform" title="Wavelet transform">Wavelet</a>
<ul><li><a href="Daubechies_wavelet" title="Daubechies wavelet">Daubechies</a></li>
<li><a href="Discrete_wavelet_transform" title="Discrete wavelet transform">DWT</a></li>
<li><a href="Set_partitioning_in_hierarchical_trees" title="Set partitioning in hierarchical trees">SPIHT</a></li></ul></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Predictive</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Differential_pulse-code_modulation" title="Differential pulse-code modulation">DPCM</a>
<ul><li><a href="Adaptive_differential_pulse-code_modulation" title="Adaptive differential pulse-code modulation">ADPCM</a></li></ul></li>
<li><a href="Linear_predictive_coding" title="Linear predictive coding">LPC</a>
<ul><li><a href="Algebraic_code-excited_linear_prediction" title="Algebraic code-excited linear prediction">ACELP</a></li>
<li><a href="Code-excited_linear_prediction" title="Code-excited linear prediction">CELP</a></li>
<li><a href="Log_area_ratio" title="Log area ratio">LAR</a></li>
<li><a href="Line_spectral_pairs" title="Line spectral pairs">LSP</a></li>
<li><a href="Warped_linear_predictive_coding" title="Warped linear predictive coding">WLPC</a></li></ul></li>
<li>Motion
<ul><li><a href="Motion_compensation" title="Motion compensation">Compensation</a></li>
<li><a href="Motion_estimation" title="Motion estimation">Estimation</a></li>
<li><a href="Motion_vector" class="mw-redirect" title="Motion vector">Vector</a></li></ul></li>
<li><a href="Psychoacoustics" title="Psychoacoustics">Psychoacoustic</a></li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Data_compression#Audio" title="Data compression">Audio</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Concepts</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Bit_rate" title="Bit rate">Bit rate</a>
<ul><li><a href="Average_bitrate" title="Average bitrate">ABR</a></li>
<li><a href="Constant_bitrate" title="Constant bitrate">CBR</a></li>
<li><a href="Variable_bitrate" title="Variable bitrate">VBR</a></li></ul></li>
<li><a href="Companding" title="Companding">Companding</a></li>
<li><a href="Convolution" title="Convolution">Convolution</a></li>
<li><a href="Dynamic_range" title="Dynamic range">Dynamic range</a></li>
<li><a href="Latency_(audio)" title="Latency (audio)">Latency</a></li>
<li><a href="Nyquist%E2%80%93Shannon_sampling_theorem" title="Nyquist–Shannon sampling theorem">Nyquist–Shannon theorem</a></li>
<li><a href="Sampling_(signal_processing)" title="Sampling (signal processing)">Sampling</a></li>
<li><a href="Silence_compression" title="Silence compression">Silence compression</a></li>
<li><a href="Sound_quality" title="Sound quality">Sound quality</a></li>
<li><a href="Speech_coding" title="Speech coding">Speech coding</a></li>
<li><a href="Sub-band_coding" title="Sub-band coding">Sub-band coding</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><br>parts</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="A-law_algorithm" title="A-law algorithm">A-law</a></li>
<li><a href="%CE%9C-law_algorithm" title="Μ-law algorithm">μ-law</a></li>
<li><a href="Differential_pulse-code_modulation" title="Differential pulse-code modulation">DPCM</a>
<ul><li><a href="Adaptive_differential_pulse-code_modulation" title="Adaptive differential pulse-code modulation">ADPCM</a></li>
<li><a href="Delta_modulation" title="Delta modulation">DM</a></li></ul></li>
<li><a href="Fourier_transform" title="Fourier transform">FT</a>
<ul><li><a href="Fast_Fourier_transform" title="Fast Fourier transform">FFT</a></li></ul></li>
<li><a href="Linear_predictive_coding" title="Linear predictive coding">LPC</a>
<ul><li><a href="Algebraic_code-excited_linear_prediction" title="Algebraic code-excited linear prediction">ACELP</a></li>
<li><a href="Code-excited_linear_prediction" title="Code-excited linear prediction">CELP</a></li>
<li><a href="Log_area_ratio" title="Log area ratio">LAR</a></li>
<li><a href="Line_spectral_pairs" title="Line spectral pairs">LSP</a></li>
<li><a href="Warped_linear_predictive_coding" title="Warped linear predictive coding">WLPC</a></li></ul></li>
<li><a href="Modified_discrete_cosine_transform" title="Modified discrete cosine transform">MDCT</a></li>
<li><a href="Psychoacoustics" title="Psychoacoustics">Psychoacoustic model</a></li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Image_compression" title="Image compression">Image</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Concepts</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Chroma_subsampling" title="Chroma subsampling">Chroma subsampling</a></li>
<li><a href="Coding_tree_unit" title="Coding tree unit">Coding tree unit</a></li>
<li><a href="Color_space" title="Color space">Color space</a></li>
<li><a href="Compression_artifact" title="Compression artifact">Compression artifact</a></li>
<li><a href="Image_resolution" title="Image resolution">Image resolution</a></li>
<li><a href="Macroblock" title="Macroblock">Macroblock</a></li>
<li><a href="Pixel" title="Pixel">Pixel</a></li>
<li><a href="Peak_signal-to-noise_ratio" title="Peak signal-to-noise ratio">PSNR</a></li>
<li><a href="Quantization_(image_processing)" title="Quantization (image processing)">Quantization</a></li>
<li><a href="Standard_test_image" title="Standard test image">Standard test image</a></li>
<li><a href="Texture_compression" title="Texture compression">Texture compression</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Methods</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Chain_code" title="Chain code">Chain code</a></li>
<li><a href="Discrete_cosine_transform" title="Discrete cosine transform">DCT</a></li>
<li><a href="Deflate" title="Deflate">Deflate</a></li>
<li><a href="Fractal_compression" title="Fractal compression">Fractal</a></li>
<li><a href="Karhunen%E2%80%93Lo%C3%A8ve_theorem" class="mw-redirect" title="Karhunen–Loève theorem">KLT</a></li>
<li><a href="Pyramid_(image_processing)" title="Pyramid (image processing)">LP</a></li>
<li><a href="Run-length_encoding" title="Run-length encoding">RLE</a></li>
<li><a href="Wavelet_transform" title="Wavelet transform">Wavelet</a>
<ul><li><a href="Daubechies_wavelet" title="Daubechies wavelet">Daubechies</a></li>
<li><a href="Discrete_wavelet_transform" title="Discrete wavelet transform">DWT</a></li>
<li><a href="Embedded_zerotrees_of_wavelet_transforms" title="Embedded zerotrees of wavelet transforms">EZW</a></li>
<li><a href="Set_partitioning_in_hierarchical_trees" title="Set partitioning in hierarchical trees">SPIHT</a></li></ul></li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Data_compression#Video" title="Data compression">Video</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Concepts</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Bit_rate" title="Bit rate">Bit rate</a>
<ul><li><a href="Average_bitrate" title="Average bitrate">ABR</a></li>
<li><a href="Constant_bitrate" title="Constant bitrate">CBR</a></li>
<li><a href="Variable_bitrate" title="Variable bitrate">VBR</a></li></ul></li>
<li><a href="Display_resolution" title="Display resolution">Display resolution</a></li>
<li><a href="Film_frame" title="Film frame">Frame</a></li>
<li><a href="Frame_rate" title="Frame rate">Frame rate</a></li>
<li><a href="Video_compression_picture_types" title="Video compression picture types">Frame types</a></li>
<li><a href="Interlaced_video" title="Interlaced video">Interlace</a></li>
<li><a href="Video#Characteristics_of_video_streams" title="Video">Video characteristics</a></li>
<li><a href="Video_quality" title="Video quality">Video quality</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Video_codec" title="Video codec">Codec</a><br>parts</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Discrete_cosine_transform" title="Discrete cosine transform">DCT</a></li>
<li><a href="Differential_pulse-code_modulation" title="Differential pulse-code modulation">DPCM</a></li>
<li><a href="Deblocking_filter" title="Deblocking filter">Deblocking filter</a></li>
<li><a href="Lapped_transform" title="Lapped transform">Lapped transform</a></li>
<li>Motion
<ul><li><a href="Motion_compensation" title="Motion compensation">Compensation</a></li>
<li><a href="Motion_estimation" title="Motion estimation">Estimation</a></li>
<li><a href="Motion_vector" class="mw-redirect" title="Motion vector">Vector</a></li></ul></li>
<li><a href="Wavelet_transform" title="Wavelet transform">Wavelet</a>
<ul><li><a href="Daubechies_wavelet" title="Daubechies wavelet">Daubechies</a></li>
<li><a href="Discrete_wavelet_transform" title="Discrete wavelet transform">DWT</a></li></ul></li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Information_theory" title="Information theory">Theory</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Compressed_data_structure" title="Compressed data structure">Compressed data structures</a>
<ul><li><a href="Compressed_suffix_array" title="Compressed suffix array">Compressed suffix array</a></li>
<li><a href="FM-index" title="FM-index">FM-index</a></li></ul></li>
<li><a href="Entropy_(information_theory)" title="Entropy (information theory)">Entropy</a></li>
<li><a href="Information_theory" title="Information theory">Information theory</a>
<ul><li><a href="Timeline_of_information_theory" title="Timeline of information theory">Timeline</a></li></ul></li>
<li><a href="Kolmogorov_complexity" title="Kolmogorov complexity">Kolmogorov complexity</a></li>
<li><a href="Prefix_code" title="Prefix code">Prefix code</a></li>
<li><a href="Quantization_(signal_processing)" title="Quantization (signal processing)">Quantization</a></li>
<li><a href="Rate%E2%80%93distortion_theory" title="Rate–distortion theory">Rate–distortion</a></li>
<li><a href="Redundancy_(information_theory)" title="Redundancy (information theory)">Redundancy</a></li>
<li><a href="Data_compression_symmetry" title="Data compression symmetry">Symmetry</a></li>
<li><a href="Smallest_grammar_problem" title="Smallest grammar problem">Smallest grammar problem</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Community</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Hutter_Prize" title="Hutter Prize">Hutter Prize</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">People</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Mark_Adler" title="Mark Adler">Mark Adler</a></li>
<li><a href="Phil_Katz" title="Phil Katz">Phil Katz</a></li></ul>
</div></td></tr></tbody></table></div>
<div class="navbox-styles"></div><div role="navigation" class="navbox" aria-labelledby="Analog_and_digital_audio_broadcasting130" style="padding:3px"><table class="nowraplinks hlist mw-collapsible mw-collapsed navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Analog_and_digital_audio_broadcasting130" style="font-size:114%;margin:0 4em"><a href="Analog_recording" title="Analog recording">Analog</a> and <a href="Digital_audio" title="Digital audio">digital audio</a> <a href="Broadcasting" title="Broadcasting">broadcasting</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Terrestrial</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Radio" title="Radio">Radio</a> <a href="Modulation" class="mw-redirect" title="Modulation">modulation</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Amplitude_modulation" title="Amplitude modulation">AM</a></li>
<li><a href="Frequency_modulation" title="Frequency modulation">FM</a></li>
<li><a href="Orthogonal_frequency-division_multiplexing" title="Orthogonal frequency-division multiplexing">COFDM</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Frequency_allocation" title="Frequency allocation">Frequency allocations</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Longwave" title="Longwave">LW</a> (<a href="Low_frequency" title="Low frequency">LF</a>)</li>
<li><a href="Medium_wave" title="Medium wave">MW</a> (<a href="Medium_frequency" title="Medium frequency">MF</a>)</li>
<li><a href="Shortwave_radio" title="Shortwave radio">SW</a> (<a href="High_frequency" title="High frequency">HF</a>)</li>
<li><a href="Very_high_frequency" title="Very high frequency">VHF</a> (<a href="Band_I" title="Band I">low</a> / <a href="Band_II" title="Band II">mid</a> / <a href="Band_III" title="Band III">high</a>)</li>
<li><a href="L_band" title="L band">L band</a> (<a href="Ultra_high_frequency" title="Ultra high frequency">UHF</a>)</li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Digital systems</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="CAM-D" title="CAM-D">CAM-D</a></li>
<li><a href="Digital_Audio_Broadcasting" title="Digital Audio Broadcasting">DAB/DAB+</a></li>
<li><a href="Digital_Radio_Mondiale" title="Digital Radio Mondiale">DRM/DRM+</a></li>
<li><a href="ISDB-T" class="mw-redirect" title="ISDB-T">ISDB-Tsb</a></li>
<li><a href="FMeXtra" title="FMeXtra">FMeXtra</a></li>
<li><a href="HD_Radio" title="HD Radio">HD Radio</a></li>
<li>CDR</li>
<li><a href="DVB-T2" title="DVB-T2">DVB-T2 Lite</a></li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Satellite</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Frequency allocations</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="C_band_(IEEE)" title="C band (IEEE)">C band</a></li>
<li><a href="Ku_band" title="Ku band">K<sub>u</sub> band</a></li>
<li><a href="L_band" title="L band">L band</a></li>
<li><a href="S_band" title="S band">S band</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Digital systems</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Astra_Digital_Radio" title="Astra Digital Radio">ADR</a></li>
<li><a href="Digital_audio_broadcasting" class="mw-redirect" title="Digital audio broadcasting">DAB-S</a></li>
<li><a href="DVB-SH" title="DVB-SH">DVB-SH</a></li>
<li><a href="S-DMB" title="S-DMB">S-DMB</a></li>
<li><a href="ETSI_Satellite_Digital_Radio" title="ETSI Satellite Digital Radio">SDR</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Commercial_broadcasting" title="Commercial broadcasting">Commercial radio</a> providers</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="SiriusXM" title="SiriusXM">SiriusXM</a>
<ul><li><a href="SiriusXM_Canada" title="SiriusXM Canada">Canada</a></li></ul></li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Advanced_Audio_Coding" title="Advanced Audio Coding">AAC</a></li>
<li><a href="Extended_Adaptive_Multi-Rate_%E2%80%93_Wideband" title="Extended Adaptive Multi-Rate – Wideband">AMR-WB+</a></li>
<li><a href="High-Definition_Coding" title="High-Definition Coding">HDC</a></li>
<li><a href="High-Efficiency_Advanced_Audio_Coding" title="High-Efficiency Advanced Audio Coding">HE-AAC</a></li>
<li><a href="MPEG-1_Audio_Layer_II" title="MPEG-1 Audio Layer II">MPEG-1 Audio Layer II</a></li>
<li><a href="Dynamic_Resolution_Adaptation" title="Dynamic Resolution Adaptation">DRA+</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Subcarrier" title="Subcarrier">Subcarrier</a> signals</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Amplitude_modulation_signalling_system" title="Amplitude modulation signalling system">AMSS</a></li>
<li><a href="DirectBand" title="DirectBand">DirectBand</a></li>
<li><a href="Program-associated_data" title="Program-associated data">PAD</a></li>
<li><a href="Radio_Data_System" title="Radio Data System">RDS/RBDS</a></li>
<li><a href="Subsidiary_communications_authority" title="Subsidiary communications authority">SCA/SCMO</a></li>
<li><a href="Data_Radio_Channel" title="Data Radio Channel">DARC</a></li></ul>
</div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Related_topics252" style="font-size:114%;margin:0 4em">Related topics</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Technical (audio)</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Audio_data_compression" class="mw-redirect" title="Audio data compression">Audio data compression</a></li>
<li><a href="Audio_signal_processing" title="Audio signal processing">Audio signal processing</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Technical (<a href="AM_stereo" title="AM stereo">AM stereo</a> formats)</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="AM_stereo#Belar_System" title="AM stereo">Belar</a></li>
<li><a href="C-QUAM" title="C-QUAM">C-QUAM</a></li>
<li><a href="AM_stereo#Harris_System" title="AM stereo">Harris</a></li>
<li><a href="AM_stereo#Kahn-Hazeltine" title="AM stereo">Kahn-Hazeltine</a></li>
<li><a href="AM_stereo#Magnavox_System" title="AM stereo">Magnavox</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Technical (emission)</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="AM_broadcasting" title="AM broadcasting">AM broadcasting</a></li>
<li><a href="AM_expanded_band" title="AM expanded band">AM expanded band</a></li>
<li><a href="Cable_radio" title="Cable radio">Cable radio</a></li>
<li><a href="Digital_radio" title="Digital radio">Digital radio</a></li>
<li><a href="Error_detection_and_correction" title="Error detection and correction">Error detection and correction</a></li>
<li><a href="FM_broadcast_band" title="FM broadcast band">FM broadcast band</a></li>
<li><a href="FM_broadcasting" title="FM broadcasting">FM broadcasting</a></li>
<li><a href="FM_extended_band_in_Brazil" title="FM extended band in Brazil">FM extended band in Brazil</a></li>
<li><a href="Multipath_propagation" title="Multipath propagation">Multipath propagation</a></li>
<li><a href="Shortwave_relay_station" title="Shortwave relay station">Shortwave relay station</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Cultural</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="History_of_radio" title="History of radio">History of radio</a></li>
<li><a href="International_broadcasting" title="International broadcasting">International broadcasting</a></li></ul>
</div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>
<ul><li><b><span class="nowrap"><span class="noviewer" typeof="mw:File"><span></span></span> </span><a href="Portal%3ARadio" title="Portal:Radio">Radio portal</a></b></li>
<li><a href="Comparison_of_radio_systems" title="Comparison of radio systems">Comparison of radio systems</a></li></ul>
</div></td></tr></tbody></table><div></div></td></tr></tbody></table></div></div><!--htdig_noindex--><div><div class="zim-footer">
This article is issued from <a class="external text" title="Last edited on 2025-05-06" href="https://en.wikipedia.org/wiki/?title=Audio_codec&oldid=1289111799">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.
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