{"id":3527,"date":"2021-03-25T20:14:42","date_gmt":"2021-03-25T20:14:42","guid":{"rendered":"http:\/\/mp4gain.com\/mp4gain\/?p=3527"},"modified":"2021-03-25T20:14:42","modified_gmt":"2021-03-25T20:14:42","slug":"audio-coding-secrets-revealed-part-2","status":"publish","type":"post","link":"https:\/\/mp4gain.com\/mp4gain\/audio-coding-secrets-revealed-part-2\/","title":{"rendered":"Audio Coding: Secrets Revealed – Part 2"},"content":{"rendered":"

Audio Coding: Secrets Revealed – Part 2<\/strong><\/p>\n

\"AUDIO<\/p>\n

Audio settings for video capture and transmission.<\/p>\n

\"AUDIO<\/p>\n

Sampling frequency (kHz, kHz)
\nSample rate (or sample rate): the frequency with which the signal is digitized, stored, processed, or converted from analog to digital. Time sampling means that the signal is represented by several of its samples (samples) taken at regular intervals.<\/p>\n

Measured in hertz (Hz, Hz) or kilohertz (kHz, kHz,) 1 kHz equals 1000 Hz. For example, 44,100 samples per second can be labeled 44,100 Hz or 44.1 kHz. The selected sample rate will determine the maximum playback frequency and, as follows from Kotelnikov’s theorem, to fully restore the original signal, the sample rate must be twice the highest frequency in the signal spectrum.<\/p>\n

As you know, the human ear is capable of picking up frequencies between 20 Hz and 20 kHz. Given these parameters and the values \u200b\u200bshown in the table below, you can understand why 44.1 kHz was chosen as the sampling frequency for CD and is still considered a very good frequency for recording.<\/p>\n

There are several reasons for choosing a higher sample rate, although it may seem like a waste of time and effort to reproduce sound outside the range of the human ear. At the same time, 44.1 – 48 kHz will suffice for the average listener for a high-quality solution to most problems.<\/p>\n

Bit depth
\nAlong with the sample rate, there is the bit depth or depth of sound. Bit depth is the number of bits of digital information to encode each sample. Simply put, the bit depth determines the “accuracy” of the input signal measurement. The larger the digit capacity, the smaller the error for each individual conversion from the magnitude of an electrical signal to a number and vice versa. With the smallest possible bit depth, there are only two options for measuring sound accuracy: 0 for full silence and 1 for full sound. If the bit width is 8 (16), then by measuring the input signal, 2 8 = 256 (2 16 = 65,536) different values \u200b\u200bcan be obtained.<\/p>\n

Bit depth is fixed in the PCM codec, but for codecs that assume compression (eg MP3 and AAC), this parameter is calculated during encoding and may vary from sample to sample.<\/p>\n

Bitrate
\nBit rate is an indicator of the amount of information that one second of sound encodes. The higher it is, the less distortion and the closer the encoded composition is to the original. For linear PCM, the bit rate is very easy to calculate.<\/p>\n

bitrate = sample rate \u00d7 bit depth \u00d7 channels<\/p>\n

For systems such as the Epiphan Pearl Mini that encode 16-bit (16-bit) linear PCM, this calculation can be used to determine how much additional bandwidth the PCM audio might require. For example, for stereo (two channels), the signal is digitized at 44.1 kHz at 16 bits and the bit rate is calculated as follows:<\/p>\n

44.1 kHz \u00d7 16 bit \u00d7 2 = 1411.2 kbps<\/p>\n

Meanwhile, audio compression algorithms like AAC and MP3 have fewer bits to transmit the signal (that’s their purpose), so they use low bit rates. Typically, the values \u200b\u200bare in the range of 96 kbps to 320 kbps. For these codecs, the higher the bit rate you choose, the more audio bits you get per sample and the better the sound quality.<\/p>\n

Sample rate, bit depth and bit rates in real life.
\nAudio CDs, one of the most popular early inventions for the general public for storing digital audio, used 44.1 kHz (20 Hz – 20 kHz, human ear range) and 16 bits. These values \u200b\u200bwere chosen to be able to save as much audio as possible to disk with good sound quality.<\/p>\n

When video was added to audio and DVD and then Blu-ray discs came along, a new standard was created. DVD and Blu-Ray recordings typically use 48 kHz (stereo) or 96 kHz (5.1 surround) linear PCM format and 24-bit depth. These settings have been chosen as ideal for keeping the audio in sync with the video while obtaining the best possible quality using additional available disk space.<\/p>\n

Our recommendations
\nCDs, DVDs, and Blu-Ray discs all have one goal: to provide the consumer with a high-quality playback engine. The goal of all developments was to provide high-quality audio and video without worrying about file size (if only it could fit on disk). Such quality could be provided by linear PCM.<\/p>\n

By contrast, mobile media and streaming media have a completely different goal: to use the lowest bit rate possible, while still being sufficient to maintain acceptable quality for the listener.<\/p>\n","protected":false},"excerpt":{"rendered":"

Audio Coding: Secrets Revealed – Part 2 Audio settings for video capture and transmission. Sampling frequency (kHz, kHz) Sample rate (or sample rate): the frequency with which the signal is digitized, stored, processed, or converted from analog to digital. Time sampling means that the signal is represented by several of its samples (samples) taken at … Continue reading “Audio Coding: Secrets Revealed – Part 2”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[45907,45908,60674,45813,45906,45798,45797,45796,45844,45795,45791,45805,45804,45880,45803,45790,45802,45808,45811,45812,60657,45814,45809,45810,57338,45816,60659,45817,60660,45822,45823,45824,45829,60662,45831,45830,45825,45833,58519,45787,45835,45834,60664,45840,60666,60665,45846,57341,45855,45793,45856,45859,45872,57343,60670,62044,57344,45876,45881,62045,45885,45884,57345,45794,45792,45788,58520,45850,57346,45890,45789,45893,45819,47735,45898,45897,57347,45860,45862,45848,60671,45858,45894,45899,23008,45807,29703,45821,45799,45800,60667,47733,45887,45900,45870,45871,62046,45827,45828,45867,45837,45838,45836,45842,45843,45841,45845,45901,57339,45854,29660,45861,45863,45864,45865,45869,45868,47734,45875,45878,45883,45806,45896,60672,45895,45902,45903,45905],"class_list":["post-3527","post","type-post","status-publish","format-standard","hentry","category-audio-video","tag-24-bit-audio-encoding","tag-32-bit-audio-encoding","tag-7-1-audio-encoding","tag-audio-cd-encoding","tag-audio-encoding-128kbps","tag-audio-encoding-aac","tag-audio-encoding-ac3","tag-audio-encoding-ac3-not-supported","tag-audio-encoding-ac3-not-supported-huawei","tag-audio-encoding-algorithms","tag-audio-encoding-and-decoding","tag-audio-encoding-base64","tag-audio-encoding-benchmark","tag-audio-encoding-bit-rate","tag-audio-encoding-bit-rate-quality","tag-audio-encoding-bitrate","tag-audio-encoding-bitrate-android","tag-audio-encoding-channels","tag-audio-encoding-check","tag-audio-encoding-code","tag-audio-encoding-codecs","tag-audio-encoding-compression","tag-audio-encoding-conversion","tag-audio-encoding-converter","tag-audio-encoding-data","tag-audio-encoding-data-size","tag-audio-encoding-difference","tag-audio-encoding-dts","tag-audio-encoding-dts-ac3","tag-audio-encoding-eac3-not-supported","tag-audio-encoding-error","tag-audio-encoding-examples","tag-audio-encoding-ffmpeg","tag-audio-encoding-files","tag-audio-encoding-flac","tag-audio-encoding-format-ac3-not-supported","tag-audio-encoding-format-eac3-not-supported","tag-audio-encoding-format-meaning","tag-audio-encoding-format-null-not-supported","tag-audio-encoding-formats","tag-audio-encoding-g-726","tag-audio-encoding-g711ulaw","tag-audio-encoding-hardware","tag-audio-encoding-hikvision","tag-audio-encoding-in-multimedia","tag-audio-encoding-involves","tag-audio-encoding-ios","tag-audio-encoding-iphone","tag-audio-encoding-library","tag-audio-encoding-linear16","tag-audio-encoding-lossless","tag-audio-encoding-mp2l2","tag-audio-encoding-pcm","tag-audio-encoding-pdf","tag-audio-encoding-podcast","tag-audio-encoding-podigee","tag-audio-encoding-python","tag-audio-encoding-quality","tag-audio-encoding-sample-rate","tag-audio-encoding-sampling","tag-audio-encoding-sampling-frequency","tag-audio-encoding-schemes","tag-audio-encoding-settings","tag-audio-encoding-software","tag-audio-encoding-standards","tag-audio-encoding-techniques","tag-audio-encoding-techniques-in-mpeg","tag-audio-encoding-techniques-in-multimedia","tag-audio-encoding-time","tag-audio-encoding-transcoding","tag-audio-encoding-types","tag-audio-encoding-using-ffmpeg","tag-audio-encoding-vs-decoding","tag-audio-encoding-vs-format","tag-audio-encoding-webm","tag-audio-encoding-wiki","tag-audio-encoding-youtube","tag-audio-format-encoding-mp4","tag-audio-format-mp3-encoding","tag-audio-input-encoding","tag-audio-text-encoding","tag-audio-ulaw-encoding","tag-audio-video-encoding","tag-audio-watermarking-encoding","tag-best-audio-encoding-format","tag-bluetooth-audio-encoding","tag-digital-audio-encoding","tag-dolby-audio-encoding-utility","tag-encoding-audio-and-video","tag-encoding-audio-and-video-bitesize","tag-encoding-audio-in-computer","tag-encoding-audio-over-ip","tag-encoding-audio-signal","tag-encoding-audio-with","tag-encoding-of-audio-signals","tag-encoding-on-audio","tag-encoding-using-audio","tag-esp32-audio-encoding","tag-ffmpeg-audio-encoding-example","tag-ffmpeg-audio-encoding-options","tag-google-audio-encoding","tag-gpu-audio-encoding","tag-gsm-audio-encoding","tag-handbrake-audio-encoding","tag-hdmi-audio-encoding","tag-hikvision-audio-encoding-type","tag-how-audio-encoding-works","tag-how-does-audio-encoding-work","tag-ivms-4200-audio-encoding-error","tag-java-audio-encoding","tag-jet-audio-mp3-encoding-pack","tag-lav-audio-matrix-encoding","tag-mp4-audio-encoding","tag-netflix-audio-encoding","tag-normal-audio-encoding","tag-obs-audio-encoding","tag-opus-audio-encoding","tag-output-audio-encoding","tag-perceptual-audio-encoding","tag-qt-audio-encoding","tag-record-audio-encoding","tag-set-audio-encoding-bitrate","tag-video-audio-encoding-settings","tag-vlc-audio-encoding","tag-voip-audio-encoding","tag-wav-audio-encoding","tag-webrtc-audio-encoding","tag-zoom-audio-encoding"],"yo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Linkedin\",\"sameAs\":[\"https:\/\/www.linkedin.com\/in\/ricardoariaszorrilla\/\"],\"url\":\"https:\/\/mp4gain.com\/mp4gain\/author\/mp4gain\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Audio Coding: Secrets Revealed - Part 2 - mp4gain.com","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/mp4gain.com\/mp4gain\/audio-coding-secrets-revealed-part-2\/","og_locale":"en_US","og_type":"article","og_title":"Audio Coding: Secrets Revealed - Part 2 - mp4gain.com","og_description":"Audio Coding: Secrets Revealed – Part 2 Audio settings for video capture and transmission. Sampling frequency (kHz, kHz) Sample rate (or sample rate): the frequency with which the signal is digitized, stored, processed, or converted from analog to digital. 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