{"id":2093,"date":"2020-10-08T18:34:23","date_gmt":"2020-10-08T18:34:23","guid":{"rendered":"http:\/\/mp4gain.com\/mp4gain\/?p=2093"},"modified":"2020-10-08T18:34:23","modified_gmt":"2020-10-08T18:34:23","slug":"audio-encoding-secrets-revealed","status":"publish","type":"post","link":"https:\/\/mp4gain.com\/mp4gain\/audio-encoding-secrets-revealed\/","title":{"rendered":"Audio encoding: secrets revealed"},"content":{"rendered":"

Audio encoding: secrets revealed<\/strong><\/p>\n

\"audio<\/p>\n

Audio settings for video capture and transmission.
\nAs people directly connected to the AV sphere, we constantly talk about audio coding and audio codecs, but what is it? An audio codec is essentially a device or algorithm that can encode and decode a digital audio signal.<\/p>\n

\"Audio<\/p>\n

In practice, the audio waves that are transmitted over the air are continuous analog signals. Signals are converted to digital format by a device called an analog-to-digital converter (ADC), and the reverse conversion device is a digital-to-analog converter (DAC). The codec is between these two functions and it is he who allows you to adjust some important parameters for the successful capture, recording and transmission of an audio signal: codec algorithm, sample rate, bit depth and data rate.<\/p>\n

The three most popular audio codecs are Pulse-Code Modulation (PCM), MP3, and Advanced Audio Coding (AAC). The choice of codec determines the compression rate and the recording quality. PCM is a codec used by computers, CDs, digital phones, and sometimes SACD. The source of the PCM signal is sampled at regular intervals and each sample is the digital amplitude of the analog signal. PCM is the simplest option for digitizing an analog signal.<\/p>\n

With the correct parameters, this digitized signal can be completely converted back to analog without any loss. Unfortunately, this codec, which provides almost complete identity with the original audio, is not very cheap, which results in large files, and these files are not suitable for streaming. We recommend using PCM to record digital images for your sources or when doing audio post-processing.<\/p>\n

Fortunately, we always have the option of choosing a different codec that can compress digital data (rather than PCM) based on some helpful observations on the behavior of sound waves. But in this case, you have to make a compromise: all alternative algorithms are associated with “losses”, since it is impossible to completely restore the original signal, but nevertheless the result is so good that most users will not be able to notice the difference.<\/p>\n

MP3 is an audio encoding format that uses a digital data compression algorithm that allows you to save the audio signal in smaller files. The MP3 codec is the most used by users to record and store music files. We recommend using MP3 to stream audio content as it requires less network bandwidth.<\/p>\n

AAC is a newer audio encoding algorithm that is the successor to MP3. AAC has become the standard for MPEG-2 and MPEG-4 formats. In fact, this is also a digital data compression codec, but with less quality loss than MP3 when encoded with the same bit rate. We recommend using this codec for online streaming.<\/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 a number 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 human hearing. 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 the sound. Bit depth is the number of bits of digital information to encode each sample. Simply put, 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.<\/p>\n","protected":false},"excerpt":{"rendered":"

Audio encoding: secrets revealed Audio settings for video capture and transmission. As people directly connected to the AV sphere, we constantly talk about audio coding and audio codecs, but what is it? An audio codec is essentially a device or algorithm that can encode and decode a digital audio signal. In practice, the audio waves … Continue reading “Audio encoding: secrets revealed”<\/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":[45907,45908,45813,45839,45818,45906,45909,45798,45797,45796,45844,45795,45791,45805,45804,45880,45803,45790,45802,45808,45811,45812,45814,45809,45810,45816,45817,45822,45823,45824,45829,45832,45831,45830,45825,45833,45787,6891,45835,45834,45840,45846,45847,45855,45793,45856,45859,45872,45873,45876,45879,45886,45881,45885,45884,45794,45792,45788,45850,45890,45889,45789,45893,45819,45898,45897,45860,45862,23837,45848,45857,45888,45891,45858,45894,45899,23008,45807,45815,29703,45821,45820,45826,45892,45799,45801,45800,45849,45866,45874,45887,45900,45852,45870,45871,45827,45828,45867,45837,45838,45836,45842,45843,45841,45845,45901,45853,45854,29660,45861,45851,45863,45864,45865,45869,45868,45875,45878,45877,45883,45882,45806,45896,45895,45902,45903,45904,45905],"class_list":["post-2093","post","type-post","status-publish","format-standard","hentry","category-audio-video","tag-24-bit-audio-encoding","tag-32-bit-audio-encoding","tag-audio-cd-encoding","tag-audio-coding-game","tag-audio-data-encoding","tag-audio-encoding-128kbps","tag-audio-encoding-5-1","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-compression","tag-audio-encoding-conversion","tag-audio-encoding-converter","tag-audio-encoding-data-size","tag-audio-encoding-dts","tag-audio-encoding-eac3-not-supported","tag-audio-encoding-error","tag-audio-encoding-examples","tag-audio-encoding-ffmpeg","tag-audio-encoding-file","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-formats","tag-audio-encoding-formats-explained","tag-audio-encoding-g-726","tag-audio-encoding-g711ulaw","tag-audio-encoding-hikvision","tag-audio-encoding-ios","tag-audio-encoding-issue","tag-audio-encoding-library","tag-audio-encoding-linear16","tag-audio-encoding-lossless","tag-audio-encoding-mp2l2","tag-audio-encoding-pcm","tag-audio-encoding-phone","tag-audio-encoding-quality","tag-audio-encoding-rate","tag-audio-encoding-sample","tag-audio-encoding-sample-rate","tag-audio-encoding-sampling-frequency","tag-audio-encoding-schemes","tag-audio-encoding-software","tag-audio-encoding-standards","tag-audio-encoding-techniques","tag-audio-encoding-techniques-in-multimedia","tag-audio-encoding-transcoding","tag-audio-encoding-tutorial","tag-audio-encoding-types","tag-audio-encoding-using-ffmpeg","tag-audio-encoding-vs-decoding","tag-audio-encoding-webm","tag-audio-encoding-wiki","tag-audio-format-encoding-mp4","tag-audio-format-mp3-encoding","tag-audio-format-vs-encoding","tag-audio-input-encoding","tag-audio-latency-encoding","tag-audio-steganography-encoding","tag-audio-track-encoding","tag-audio-ulaw-encoding","tag-audio-video-encoding","tag-audio-watermarking-encoding","tag-best-audio-encoding-format","tag-bluetooth-audio-encoding","tag-c-audio-encoding","tag-digital-audio-encoding","tag-dolby-audio-encoding-utility","tag-dvd-audio-encoding","tag-dvd-flick-audio-encoding-error","tag-dvd-flick-audio-encoding-takes-forever","tag-encoding-audio-and-video","tag-encoding-audio-and-video-bbc","tag-encoding-audio-and-video-bitesize","tag-encoding-audio-iphone","tag-encoding-audio-output","tag-encoding-audio-python","tag-encoding-audio-signal","tag-encoding-audio-with","tag-encoding-in-audio-files","tag-encoding-of-audio-signals","tag-encoding-on-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-is-audio-encoding","tag-java-audio-encoding","tag-jet-audio-mp3-encoding-pack","tag-lav-audio-matrix-encoding","tag-mobile-audio-encoding-formats-include","tag-mp4-audio-encoding","tag-netflix-audio-encoding","tag-normal-audio-encoding","tag-obs-audio-encoding","tag-opus-audio-encoding","tag-perceptual-audio-encoding","tag-qt-audio-encoding","tag-quicktime-audio-encoding","tag-record-audio-encoding","tag-rtp-audio-encoding","tag-set-audio-encoding-bitrate","tag-video-audio-encoding-settings","tag-voip-audio-encoding","tag-wav-audio-encoding","tag-webrtc-audio-encoding","tag-youtube-audio-encoding","tag-zoom-audio-encoding"],"yoast_head":"\nAudio 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