{"id":2694,"date":"2020-12-04T22:51:52","date_gmt":"2020-12-04T22:51:52","guid":{"rendered":"http:\/\/mp4gain.com\/mp4gain\/?p=2694"},"modified":"2020-12-04T22:51:52","modified_gmt":"2020-12-04T22:51:52","slug":"digital-audio-information-part-2","status":"publish","type":"post","link":"https:\/\/mp4gain.com\/mp4gain\/digital-audio-information-part-2\/","title":{"rendered":"Digital audio information (Part 2)"},"content":{"rendered":"

Digital audio information (Part 2)<\/strong><\/p>\n

\"DIGITAL<\/p>\n

Sampling frequency. A microphone connected to the sound card is used to record analog sound and convert it to digital format. The quality of the digital sound obtained depends on the number of measurements of the sound volume level per unit of time, that is, the sampling frequency. The more measurements that are made in 1 second (the higher the sampling frequency), the more accurately the “ladder” of the digital audio signal repeats the curve of the dialogue signal.<\/p>\n

\"Digital<\/p>\n

The audio sample rate is the number of sound volume measurements in one second.<\/p>\n

The audio sample rate can vary between 8000 and 48000 sound volume measurements per second.<\/p>\n

Audio encoding depth. Each “step” is assigned a specific value for the sound volume level. Loudness levels of sound can be viewed as a set of possible states N, for which a certain amount of information I is required, which is called audio coding depth.<\/p>\n

Audio encoding depth is the amount of information required to encode the discrete volume levels of digital audio.<\/p>\n

If the encoding depth is known, then the number of digital audio loudness levels can be calculated using the formula N = 2I. Let the sound encoding depth be 16 bit, then the number of sound volume levels is:<\/p>\n

N = 2I = 216 = 65536.<\/p>\n

During the encoding process, each sound volume level is assigned its own 16-bit binary code, the lowest sound level will correspond to the code 0000000000000000 and the highest – 1111111111111111.<\/p>\n

The quality of digitized sound. The higher the sampling frequency and depth of the sound, the better the sound of the digitized sound. The lowest quality of digitized sound, corresponding to the quality of telephone communication, is obtained at a sampling rate of 8000 times per second, a sampling rate of 8 bits, and by recording an audio track (“mono” mode). The highest quality of digitized sound, corresponding to the quality of an audio CD, is achieved with a sampling rate of 48,000 times per second, a sampling rate of 16 bits and the recording of two audio tracks (stereo mode) .<\/p>\n

It should be remembered that the higher the quality of the digital sound, the greater the volume of information in the audio file. It is possible to estimate the volume of information of a digital stereo sound file with a duration of 1 second with an average sound quality (16 bits, 24,000 measurements per second). To do this, the encoding depth must be multiplied by the number of measurements in 1 second and multiplied by 2 (stereo sound):<\/p>\n

16 bit? 24,000? 2 = 768,000 bits = 96,000 bytes = 93.75 KB.<\/p>\n

Sound editors. Sound editors allow you not only to record and play sound, but also to edit it. Digitized sound is presented in sound editors visually, so copying, moving, and deleting parts of the audio track can be easily performed with the mouse. Furthermore, you can layer audio tracks on top of each other (mix sounds) and apply various acoustic effects (echo, reverse playback, etc.).<\/p>\n

Sound editors allow you to change the digital sound quality and volume of an audio file by changing the sample rate and encoding depth. Digitized audio can be saved uncompressed as universal WAV or compressed MP3 audio files.<\/p>\n

By storing audio in compressed formats, low-intensity audio frequencies “excessive” for human perception are discarded, coinciding in time with high-intensity audio frequencies. Using this format allows you to compress audio files dozens of times, but it leads to irreversible loss of information (files cannot be restored in their original form).
\ntest questions<\/p>\n

1. How do sample rate and encoding depth affect digital audio quality?
\nSelf-help assignments<\/p>\n

1.22. Selective Response Mapping. The sound card performs binary encoding of the analog audio signal. How much information is needed to encode each of the 65,536 possible levels of signal intensity?
\n16 bits;
\n256 bits;
\n1 bit;
\n8 bits.<\/p>\n

1.23. A task with a detailed answer. Estimate the volume of information in digital audio files with a duration of 10 seconds at an encoding depth and a sample rate of an audio signal that provides the minimum and maximum sound quality:<\/p>\n

a) mono, 8 bits, 8000 measurements per second;<\/p>\n

b) stereo, 16 bits, 48,000 measurements per second.<\/p>\n","protected":false},"excerpt":{"rendered":"

Digital audio information (Part 2) Sampling frequency. A microphone connected to the sound card is used to record analog sound and convert it to digital format. The quality of the digital sound obtained depends on the number of measurements of the sound volume level per unit of time, that is, the sampling frequency. The more … Continue reading “Digital audio information (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":[22888,28067,22897,22895,22901,22902,22903,22899,43025,43026,22933,22909,22910,22920,22922,22921,22919,22940,22939,22938,22935,22936,22943,22907,22946,22944,41197,22913,22918,22916,22914,22925,22923,22891,15335,22949,22948,22950,22892,22889,28075,22890,22947,28077,41194,22934,22937,22932,22929,41201,22953,47818,22924,22928,28071,28088,28072,41198,28073,28087,28074,41199,41200,43027,41195,22905,22908,22958,22957,22956,43028,41202,22955,22959,22960,50676],"class_list":["post-2694","post","type-post","status-publish","format-standard","hentry","category-audio-video","tag-are-digital-audio-and-optical-the-same","tag-are-digital-audio-players-worth-it","tag-can-a-digital-audio-cable-go-bad","tag-can-digital-audio-be-converted-to-analog","tag-can-dogs-hear-digital-audio","tag-can-midi-transfer-digital-audio","tag-can-you-convert-digital-audio-to-analog","tag-can-you-convert-digital-audio-to-rca","tag-can-you-split-digital-audio-signal","tag-can-you-splitter-digital-audio-output","tag-digital-audio-has-no-sound","tag-do-digital-audio-cables-go-bad","tag-do-digital-audio-converters-work","tag-does-digital-audio-cable-make-a-difference","tag-does-digital-audio-carry-video","tag-does-digital-audio-software-needs-magnetism","tag-does-digital-audio-support-5-1","tag-does-displayport-have-digital-audio","tag-does-imac-have-digital-audio-out","tag-does-ipad-have-digital-audio-output","tag-does-ps4-have-digital-audio-out","tag-does-roku-have-digital-audio-out","tag-does-xbox-one-have-digital-audio","tag-how-did-digital-audio-start","tag-how-digital-audio-system","tag-how-digital-audio-works","tag-how-do-digital-audio-files-work","tag-how-do-digital-audio-filters-work","tag-how-do-digital-audio-systems-work","tag-how-do-digital-audio-work","tag-how-do-digital-audiobooks-work","tag-how-does-digital-audio-out-work","tag-how-does-digital-audio-work","tag-is-digital-audio","tag-is-digital-audio-analog","tag-is-digital-audio-better-than-analog","tag-is-digital-audio-better-than-hdmi","tag-is-digital-audio-cable-same-as-rca","tag-is-digital-audio-coaxial","tag-is-digital-audio-out-the-same-as-optical","tag-is-digital-audio-out-the-same-as-toslink","tag-is-digital-audio-output-the-same-as-optical","tag-is-digital-audio-the-same-as-optical","tag-is-digital-audio-workstation","tag-is-digital-audio-workstation-free","tag-piotr-has-digital-audio","tag-tv-doesnt-have-digital-audio-out","tag-tv-has-digital-audio","tag-tv-only-has-digital-audio-out","tag-what-digital-audio-is","tag-what-digital-audio-output","tag-what-do-digital-audio","tag-what-does-digital-audio-out-mean","tag-what-does-digital-audio-output-raw-mean","tag-what-is-digital-audio","tag-what-is-digital-audio-broadcasting","tag-what-is-digital-audio-out","tag-what-is-digital-audio-out-optical","tag-what-is-digital-audio-output","tag-what-is-digital-audio-output-on-tv","tag-what-is-digital-audio-s-pdif","tag-what-should-digital-audio-output-be","tag-what-should-my-digital-audio-output-be","tag-whats-digital-audio-out","tag-when-did-digital-audio-begin","tag-when-did-digital-audio-recording-begin","tag-when-did-digital-optical-audio-come-out","tag-where-is-the-digital-audio-output-on-a-samsung-tv","tag-which-digital-audio-cable-is-best","tag-which-digital-audio-format-is-best","tag-which-digital-audio-player","tag-which-digital-audio-recorders","tag-which-digital-audio-workstation-is-best","tag-why-digital-audio-is-better-than-analog","tag-will-rca-cable-work-digital-audio","tag-xbox-have-digital-audio"],"yoast_head":"\nDigital audio information (Part 2) - mp4gain.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mp4gain.com\/mp4gain\/digital-audio-information-part-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Digital audio information (Part 2) - mp4gain.com\" \/>\n<meta property=\"og:description\" content=\"Digital audio information (Part 2) Sampling frequency. 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