{"id":2530,"date":"2020-11-18T21:09:42","date_gmt":"2020-11-18T21:09:42","guid":{"rendered":"http:\/\/mp4gain.com\/mp4gain\/?p=2530"},"modified":"2020-11-18T21:09:42","modified_gmt":"2020-11-18T21:09:42","slug":"how-is-sound-quality-measured","status":"publish","type":"post","link":"https:\/\/mp4gain.com\/mp4gain\/how-is-sound-quality-measured\/","title":{"rendered":"How is sound quality measured?"},"content":{"rendered":"

How is sound quality measured?<\/strong><\/p>\n

\"Sound<\/p>\n

For more than two decades, there has been a debate about how to measure quality. There is a sea of \u200b\u200bopinions, but the one thing that everyone agrees on is that the value of the harmonic distortion of a signal means nothing.<\/p>\n

\"sound<\/p>\n

About “good” distortions. There is a stable and orthodox class of audiophiles who are fans of tube sound. When comparing the sound of amplifiers without negative feedback (NF), which reduce harmonic distortion, and amplifiers with NF, they give preference to amplifiers without NF. And this is logical, because the tube amplifier has a narrower frequency band due to the use of transformers. The predominance of lower order harmonics in your sound subjectively enhances the sound. Here’s an example: Famous tube guru A. Likhnitsky several years ago praised his amp proofreader for a turntable. In it, he introduced positive feedback, which increases non-linear distortion. The resulting overexposure of the sound seems correct to the author of the development, although, I must say, it is far from a universal solution. For many people whose hearing sensitivity to high frequencies increases, this device is simply unbearable to listen to.<\/p>\n

In many books and articles it can be read that a person determines the location of a sound source due to the fact that he feels the phase difference in the signals received by his ears. In fact, nature does not know a parameter such as the phase of the signal; this is a mathematical abstraction that is convenient for calculations. Hearing, on the other hand, operates:<\/p>\n

– Intensity, and recognizes signals in the range of no more than 40 dB during a short time interval. If a loud sound is followed by a sound with a level lower than the first by 40 dB, then it is not audible. The transition to other intensities requires more or less adaptation time.<\/p>\n

– Frequency. The structure of the ear and the nervous system contains, on average, about 2000 frequency analyzers. There really is an extension. So don’t be offended if you don’t listen to what others are hearing, all statements are about your own heritage.<\/p>\n

– Time. Hearing and the brain determine the difference in the arrival time of signals in different ears, not the phase. And time resolution is measured in microseconds!<\/p>\n

The whole of this “hardware” is double and has memory. Localization is impossible if the difference in intensities and arrival times is simultaneously small.<\/p>\n

Norbert Wiener said that the language of the brain is not mathematical. Modern equipment uses a mathematical apparatus to transform the temporal sequence of signals into the spectral domain, where mathematical processing is possible. The fundamental disadvantage of this technique is that it works in portions: a set of samples is memorized, a conversion is done “there”, it is processed, then a conversion “backwards” or a control action. And hearing works on a spectrum in real time. In addition, memory allows you to “scroll” what you heard multiple times for more detailed recognition of the sound image, be it a verbal message or spatial information. Thanks to these properties of hearing, “deep localization” is possible. Its essence is not at all that the hearing compares the spectra of the signal received and previously “recorded”, supposedly there is a memory of how the sound should be heard at different distances, but in the fact that it analyzes the time series and selects a substring in it that does not belong to the main signal, but to its reverb sound, and by the time difference determines the distance to the sound source. (Reverberation is the decay process of sound that accompanies its reflections, the most prominent example being the echo, as well as the rumbling of an empty room). That is why a person can determine the distance to a sound source that they have never heard. The “auditory brain” system has remarkable capabilities, it is a combined filter of colossal equivalent processing power, which allows it to “extract” the expected set of sounds from much higher noise levels.<\/p>\n

The presence of a comb of 2000 separate frequency sensors in the hearing analyzer does not lead to coarseness of auditory sensations. Everyone can check it out. Take a high-quality speaker, connect an audio sine generator across the amplifier, and use the SPL meter (located at the listening position!) To eliminate the frequency response with a smooth frequency slip. You will be surprised how uneven this graph will be than the one obtained by the RTA method in one-third octave bands of pink noise. Then, with the chart in hand, listen to the speaker again.<\/p>\n","protected":false},"excerpt":{"rendered":"

How is sound quality measured? For more than two decades, there has been a debate about how to measure quality. There is a sea of \u200b\u200bopinions, but the one thing that everyone agrees on is that the value of the harmonic distortion of a signal means nothing. About “good” distortions. There is a stable and … Continue reading “How is sound quality measured?”<\/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":[52330,52307,52221,52279,52314,52323,52324,52326,52325,52328,52327,52278,52322,52262,52305,52301,52304,52302,52303,52300,52280,52282,52315,52349,52348,52263,52233,52331,52259,52347,52220,52293,52295,52226,52228,52227,52229,52225,52283,52258,52231,52230,52232,52284,52285,52291,52234,52240,52235,52239,52237,52241,52236,52238,52274,52246,52248,52245,52244,52249,52247,52242,52243,52287,52321,52254,52255,52281,52251,52252,52257,52256,52253,52250,52297,52299,52290,52289,52288,52273,52296,52212,52224,52213,52264,52223,52216,52219,52214,52265,52218,52266,52270,52320,52269,52267,52271,52319,52268,52217,52215,52276,52275,52277,52298,52294,52292,52222,52286,52329,52313,52311,52309,52312,52308,52310,52318,52317,52316,52272,52333,52339,52340,52337,52336,52335,52334,52338,52342,52344,52343,52346,52345,52341,52332,52306,52261,52260],"class_list":["post-2530","post","type-post","status-publish","format-standard","hentry","category-audio-video","tag-airpod-sound-quality-messed-up","tag-are-airpods-better-sound-quality-than-earpods","tag-bad-sound-quality-after-windows-10","tag-bad-sound-quality-over-bluetooth","tag-bad-sound-quality-through-hdmi","tag-best-headphones-sound-quality-under-100","tag-best-sound-quality-earphones-under-1000","tag-best-sound-quality-earphones-under-2000","tag-best-sound-quality-earphones-under-500","tag-best-sound-quality-headphones-under-2000","tag-best-sound-quality-mobile-under-15000","tag-best-sound-quality-over-ear-headphones","tag-best-sound-quality-under-200","tag-better-sound-quality-sound-like-mini","tag-better-sound-quality-than","tag-better-sound-quality-than-airpods","tag-better-sound-quality-than-cd","tag-better-sound-quality-than-skype","tag-better-sound-quality-than-sonos","tag-better-sound-quality-than-spotify","tag-good-sound-quality-over-ear-headphones","tag-how-to-improve-sound-quality-over-bluetooth","tag-improve-sound-quality-through-headphones","tag-is-spotify-premium-sound-quality-worth-it","tag-is-spotify-sound-quality-worth-it","tag-midi-sound-quality","tag-poor-sound-quality-during-phone-call","tag-quality-of-sound-depends-upon","tag-quality-sound-like","tag-quality-sound-without-subwoofer","tag-sound-quality-above-320-kbps","tag-sound-quality-airpods-pro","tag-sound-quality-airpods-pro-vs-airpods","tag-sound-quality-between-airpods-and-earpods","tag-sound-quality-between-dacs","tag-sound-quality-between-echo-and-echo-dot","tag-sound-quality-between-headphones","tag-sound-quality-between-spotify-and-apple-music","tag-sound-quality-bits-per-second","tag-sound-quality-can-be-divided-into-amplitude","tag-sound-quality-difference-between-airpods-and-airpods-pro","tag-sound-quality-difference-between-airpods-and-earpods","tag-sound-quality-difference-between-vinyl-and-digital","tag-sound-quality-disney-plus","tag-sound-quality-echo-plus","tag-sound-quality-echo-vs-echo-plus","tag-sound-quality-for-airpods","tag-sound-quality-for-crossword","tag-sound-quality-for-echo-dot","tag-sound-quality-for-iphone","tag-sound-quality-for-itunes","tag-sound-quality-for-mp3","tag-sound-quality-for-soundcloud","tag-sound-quality-for-streaming","tag-sound-quality-frequency-is-grayed-out","tag-sound-quality-from-alexa","tag-sound-quality-from-cd","tag-sound-quality-from-echo-dot","tag-sound-quality-from-hdmi-vs-optical","tag-sound-quality-from-headphone","tag-sound-quality-from-soundcloud","tag-sound-quality-from-spotify","tag-sound-quality-from-youtube","tag-sound-quality-galaxy-buds-plus","tag-sound-quality-headphones-under-100","tag-sound-quality-in-airpods","tag-sound-quality-in-apple-music","tag-sound-quality-in-ear-vs-over-ear","tag-sound-quality-in-music","tag-sound-quality-in-spotify","tag-sound-quality-in-tenet","tag-sound-quality-in-windows-10","tag-sound-quality-in-youtube","tag-sound-quality-in-zoom","tag-sound-quality-ipad-pro","tag-sound-quality-ipad-pro-10-5","tag-sound-quality-iphone-6s-plus","tag-sound-quality-iphone-7-plus","tag-sound-quality-iphone-8-plus","tag-sound-quality-is-top-notch","tag-sound-quality-macbook-pro","tag-sound-quality-of-airpods","tag-sound-quality-of-airpods-2","tag-sound-quality-of-airpods-pro","tag-sound-quality-of-apple-music","tag-sound-quality-of-bone-conduction-headphones","tag-sound-quality-of-echo-dot","tag-sound-quality-of-sony-wh1000xm3","tag-sound-quality-of-spotify","tag-sound-quality-of-vinyl","tag-sound-quality-of-youtube-music","tag-sound-quality-on-airpods","tag-sound-quality-on-airpods-pro","tag-sound-quality-on-echo-dot","tag-sound-quality-on-echo-show-8","tag-sound-quality-on-iphone","tag-sound-quality-on-iphone-11","tag-sound-quality-on-netflix","tag-sound-quality-on-spotify","tag-sound-quality-on-youtube","tag-sound-quality-on-zoom","tag-sound-quality-over-airplay","tag-sound-quality-over-bluetooth","tag-sound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is sound quality measured? - 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\/how-is-sound-quality-measured\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How is sound quality measured? - mp4gain.com\" \/>\n<meta property=\"og:description\" content=\"How is sound quality measured? For more than two decades, there has been a debate about how to measure quality. There is a sea of \u200b\u200bopinions, but the one thing that everyone agrees on is that the value of the harmonic distortion of a signal means nothing. About “good” distortions. There is a stable and … Continue reading "How is sound quality measured?"\" \/>\n<meta property=\"og:url\" content=\"https:\/\/mp4gain.com\/mp4gain\/how-is-sound-quality-measured\/\" \/>\n<meta property=\"og:site_name\" content=\"mp4gain.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/mp4gain\" \/>\n<meta property=\"article:published_time\" content=\"2020-11-18T21:09:42+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/miro.medium.com\/max\/960\/1*rV5w6gRf2bq9hmekfuq1WQ.jpeg\" \/>\n<meta name=\"author\" content=\"R. 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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":"How is sound quality measured? - 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\/how-is-sound-quality-measured\/","og_locale":"en_US","og_type":"article","og_title":"How is sound quality measured? - mp4gain.com","og_description":"How is sound quality measured? For more than two decades, there has been a debate about how to measure quality. There is a sea of \u200b\u200bopinions, but the one thing that everyone agrees on is that the value of the harmonic distortion of a signal means nothing. About “good” distortions. 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