2021年5月4日 星期二

DSD vs MP3

昨天終於收到四月廿三日下單的隨身音樂播放器(隨身聽或簡稱MP3), 不過這年代真要聽MP3格式的音樂通常用行動電話就可以了, 所以這個新買的隨身聽當然不是單純MP3的播放器, 它的特點在於能播放DSD格式的音樂檔. 雖然DSD已經由索尼和飛利浦以SACD做為媒體推行不少年, 可是使用者和廠商(含音樂製作與器材生產)都並不熱衷, 所以仍舊屬於小眾市場, 如果不是因為最近有個專案和這方面有關聯, 應該也不會想花錢去買這種玩具.

廢話有點多, 言歸正傳. 昨晚下載了(購買網路下載版)一些DSD檔案, 早上將檔案複製到記憶卡中, 並同時將相同曲目的MP3檔案也複製到記憶卡上, 想要比較一下兩種格式聽起來是否真有不同. 早上才聽了兩種格式的各一小段就發現自己在搞笑, 因為雖然曲目相同, 但演奏者不同、錄音不同、製作人不同...., 最後還有檔案格式不同, 根本聽起來二者就差異很大, 在客觀基礎就不同時實在完全無法比較! 或許可行的做法還是上2L網站去下載相同曲目和錄音的不同格式, 那就應該可以有相同基礎而不同格式的比較結果了.

2021-05-06 更新
下載了2L的測試檔, 共比較了同一曲目(Mozart: Violin concerto in D major - Allegro)的四種轉換版本, 分別是: (以下檔案結連皆出自"2L - the Nordic Sound"網站)
  1. Original CD 16BIT/44kHz, 49MB
  2. Stereo 24BIT/192kHz, 338MB
  3. Stereo DSD 128 5.6448Mbit/s, 750M
  4. Stereo DSD 256 11.2896Mbit/s, 1.4GB
其中前三個檔案是2006的原始發行, 第四個檔案則是2016重新混音發行的版本. 重點來了, 我聽不出它們之間的差異! 原因可能很多, 除了我沒有金耳朵外, 部門助理也給了一個忠肯的看法: 耳機不夠好!

附記: 在NativeDSD買的音樂會聽起來很不一樣, 原因在查了之後才發現到, 該演奏家(Zachary Carrettin)是以中提琴來演出巴赫無伴奏大提琴組曲, 也難怪結果會如此不同.

2021年5月3日 星期一

Public key of office/home e-mail account

The public key of GnuPG just created this afternoon, 2021/05/03, since my original key for encryption was expired and that one can only sign.

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The public key of GnuPG just created tonight, 2021/07/02, since my original key for encryption was expired and that one no longer to be used.

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