realies

Peer-Reviewed Listening Tests That Include Uncompressed (WAV/CD) Versus 320 kb/s MP3

Design – 13 trained listeners (9 recording engineers, 4 professional musicians) took double-blind A/B preference tests. Each excerpt (pop, metal-rock, contemporary classical, orchestra, opera) was presented in the uncompressed 44.1 kHz/16-bit version and five MP3 bit-rates: 96, 128, 192, 256 and 320 kb/s (LAME encoder).
Key 320 kb/s result – For 256 kb/s and 320 kb/s the panel showed no statistically significant preference for the WAV over the MP3. Only the most experienced engineers (≥7 years studio work) could sometimes identify the 320 kb/s file, and even they performed just above chance.
Take-away – In controlled ITU-style tests even trained ears could not reliably distinguish 320 kb/s MP3 from uncompressed audio across all five ge

	#!/bin/bash
	set -e

	{
	docker exec --user www-data nextcloud php cron.php
	docker exec --user www-data nextcloud php /var/www/html/occ db:add-missing-columns --no-interaction
	docker exec --user www-data nextcloud php /var/www/html/occ db:add-missing-primary-keys --no-interaction
	docker exec --user www-data nextcloud php /var/www/html/occ db:add-missing-indices --no-interaction
	docker exec --user www-data nextcloud php /var/www/html/occ db:convert-filecache-bigint --no-interaction
	docker exec --user www-data nextcloud php /var/www/html/occ maintenance:mimetype:update-db --no-interaction

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	// @grant GM_addStyle
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	@echo off
	setlocal enabledelayedexpansion

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