# Speech coding
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## Microsims — p5.js
### Speech coding (p5.js) · `vocoder`
<div class="microsim-player">
<iframe src="https://editor.p5js.org/sciencenibber/full/Gxz9oSmSV" width="100%" height="480" frameborder="0" loading="lazy" sandbox="allow-scripts allow-same-origin" title="Speech coding — p5.js microsim"></iframe>
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*Compress speech by modeling how the voice is produced, squeezing a call into a few kilobits.*
**Open in the editor:** [▶ fork this sketch](https://editor.p5js.org/sciencenibber/sketches/Gxz9oSmSV) · movement *V · Coding, compression & communication* · library `p5js`
### Related microsims
Live sims on neighbouring articles — 6 of them inside this article's own Wikipedia link tree:
- [[Companding]] *(in tree)*
- [[Convolution]] *(in tree)*
- [[Data_compression]] *(in tree)*
- [[Delta_modulation]] *(in tree)*
- [[Differential_pulse-code_modulation]] *(in tree)*
- [[Digital_signal_processing]] *(in tree)*
*Sim hosted off-article; the article owns the reference, not the runtime (WIKI_RULES §10.4). Placed by `g08_place_microsims.py`.*
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## Links (Wikipedia order)
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`842_(compression_algorithm)` · `A-law_algorithm` · `AAC-LD` · `ATRAC` · `Adaptive_Huffman_coding` · `Adaptive_Multi-Rate_audio_codec` · `Adaptive_coding` · `Adaptive_differential_pulse-code_modulation` · `Algebraic_code-excited_linear_prediction` · `Apple_Inc.` · `Arithmetic_coding` · `Asymmetric_numeral_systems` · `Audio_Engineering_Society` · `Audio_bit_depth` · `Audio_codec` · `Audio_signal_processing` · `Autoencoder` · `Average_bitrate` · `Bit_rate` · `Brotli` · `Burrows–Wheeler_transform` · `Byte-pair_encoding` · `Bzip2` · `CDMA2000` · `CELT` · `Canonical_Huffman_code` · `Chain_code` · `Chroma_subsampling` · `Code-excited_linear_prediction` · `Codec_2` · `Coding_tree_unit` · `Color_space` · [[Companding]] · `Compressed_data_structure` · `Compressed_suffix_array` · `Compression_artifact` · `Constant_bitrate` · `Context_mixing` · `Context_tree_weighting` · [[Convolution]] · [[Data_compression]] · `Data_compression_symmetry` · `Daubechies_wavelet` · `David_A._Huffman` · `Deblocking_filter` · `Deep_learning_speech_synthesis` · `Deflate` · `Delta_encoding` · [[Delta_modulation]] · `Dictionary_coder` · [[Differential_pulse-code_modulation]] · `Digital_audio` · `Digital_radio` · [[Digital_signal_processing]] · [[Discrete_cosine_transform]] · `Discrete_sine_transform` · [[Discrete_wavelet_transform]] · `Display_resolution` · `Dynamic_Markov_compression` · [[Dynamic_range]] · `Elias_gamma_coding` · `Embedded_zerotrees_of_wavelet_transforms` · `Enhanced_full_rate` · [[Entropy_(information_theory)]] · `Entropy_coding` · `Exponential-Golomb_coding` · `FM-index` · `FaceTime` · [[Fast_Fourier_transform]] · `Fibonacci_coding` · `Film_frame` · `Fourier_transform` · `Fractal_compression` · `Frame_rate` · `Free_software` · `Full_Rate` · `Fundamental_frequency` · `G.711` · `G.722` · `G.722.1` · `G.723.1` · `G.726` · `G.728` · `G.729` · `G.729.1` · `GSM` · `GitHub` · `Golomb_coding` · `Grammar-based_code` · `Half_Rate` · `Huffman_coding` · `Hutter_Prize` · [[Image_compression]] · `Image_resolution` · `Incremental_encoding` · [[Information_theory]] · `Intelligibility_(communication)` · `Interlaced_video` · `Kolmogorov_complexity` · `LHA_(file_format)` · `LZ4_(compression_algorithm)` · `LZ77_and_LZ78` · `LZFSE` · `LZMA` · `LZRW` · `LZWL` · `LZX` · `Lapped_transform` · `Latency_(audio)` · `Lempel–Ziv–Oberhumer` · `Lempel–Ziv–Stac` · `Lempel–Ziv–Storer–Szymanski` · `Lempel–Ziv–Welch` · `Levenshtein_coding` · `Line_spectral_pairs` · `Linear_prediction` · `Linear_predictive_coding` · `Log_area_ratio` · `Lossless_compression` · `Lossy_compression` · `Lyra_(codec)` · [[Machine_learning]] · `Macroblock` · `Mark_Adler` · `Mobile_telephony` · `Modified_Huffman_coding` · `Modified_discrete_cosine_transform` · `Motion_compensation` · `Motion_estimation` · `Move-to-front_transform` · `Mu-law_algorithm` · [[Nyquist–Shannon_sampling_theorem]] · `Opus_(audio_format)` · `PAQ` · `Peak_signal-to-noise_ratio` · `Phil_Katz` · `Pixel` · `PlayStation_4` · `PlayStation_Network` · `Prediction_by_partial_matching` · `Prefix_code` · `Psychoacoustics` · `Pyramid_(image_processing)` · `Quantization_(image_processing)` · [[Quantization_(signal_processing)]] · `Range_coding` · `Rate–distortion_theory` · `Re-Pair` · `Redundancy_(information_theory)` · `Run-length_encoding` · `SILK` · [[Sampling_(signal_processing)]] · `Satellite_phone` · `Secure_voice` · `Selectable_Mode_Vocoder` · `Sequitur_algorithm` · `Set_partitioning_in_hierarchical_trees` · `Shannon_coding` · `Shannon–Fano_coding` · `Shannon–Fano–Elias_coding` · `Silence_compression` · `Smallest_grammar_problem` · `Snappy_(compression)` · `Sound_quality` · `Speech` · `Speech_processing` · `Speech_synthesis` · `Speex` · `Standard_test_image` · `Sub-band_coding` · `Texture_compression` · `The_Register` · `Timeline_of_information_theory` · `Transform_coding` · `Tunstall_coding` · `Unary_coding` · `Unified_Speech_and_Audio_Coding` · `Universal_code_(data_compression)` · `Variable_bitrate` · `Vector_quantization` · `Video` · `Video_codec` · `Video_compression_picture_types` · `Video_quality` · `Vocoder` · `Voice_over_IP` · `Warped_linear_predictive_coding` · `Wavelet_transform` · [[Wayback_Machine]] · `WhatsApp` · `Zstd`
> Signal Processing concept · part of the Signal Processing Portal · movement V · !74 記号 kigō.svg
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*Rendered from the live microsim (▶ motion).*
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## See it next
[](Speech_signal_processing)
*→ Speech signal processing*
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Back to Signal Processing Portal · the room · Semiotic gateway
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## What it is
Speech coding is the compression of digitized speech signals using models tuned specifically to the properties of the human voice.
## How it works / why it matters
Speech coders such as CELP and LPC-based vocoders represent the voice as a model of the vocal tract excited by a source signal, transmitting compact model parameters rather than raw waveform samples. This exploits speech's predictable structure to achieve very low bit rates, making it essential to mobile telephony, VoIP, and digital radio.
## Signs & universals
Instantiates encoding, signal and tradeoff_balance.
## Related
Related: Speech signal processing, Speech communication, Audio data compression, [[Data_compression]], Codec.
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## From the Real GENERATIVE library
> Speech coding is an application of data compression to digital audio signals containing speech. Speech coding uses speech-specific parameter estimation using audio signal processing techniques to model the speech signal, combined with generic data compression algorithms to represent the resulting modeled parameters in a compact bitstream.[1] ([Wikipedia](https://en.wikipedia.org/wiki/Speech_coding))
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*Built to the [[WT!P5_js_Microsim_Master_Class|p5.js Master Class]].*
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## Wikipedia : Wikitube
**Strict pair:** [Wikipedia](https://en.wikipedia.org/wiki/Speech_coding) : [Wikitube](https://en.wikitube.io/wiki/Speech_coding)
## Previous hub tags
Tree parent: [[Information_theory]].
Legacy hubs: none.
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*Sources: 1 legacy note. Minted wave 1, 2026-07-30 (v1.6 order).*