Tags: , , , , , | Categories: Lossless Posted by Sol on 16/06/2011 3:46 CH | Bình luận (46)

Phàm là người chơi âm thanh, không phải ai cũng đủ tiền để mua về những CD “xịn” có giá tới vài ba chục USD/album. Lợi dụng tiến bộ của công nghệ, một hai năm nay những audiophile (người chơi âm thanh chuyên nghiệp) đã tìm đến một cách chơi đỡ tốn kém hơn: chơi nhạc lossless.


Lùng tìm lossless

Nếu bạn chưa từng chơi dàn máy âm thanh (gồm những thiết bị chủ yếu như đầu đọc đĩa, ampli, loa…) thì có thể bạn sẽ không có khái niệm gì về lossless. Với những audiophile thì khác, gần như đây là một “phương thuốc đặc hiệu” giúp thỏa mãn cơn “ghiền nhạc” mà chỉ phải đầu tư một khoản rất nhỏ so với việc tìm mua những CD xịn. Hãy tính, một CD, LP (đĩa than) xịn có giá ít nhất 150.000 đ, loại đắt hơn có thể tới triệu bạc, nếu nhân lên với hàng trăm CD thì con số sẽ là bao nhiêu?!

Lossless được hiểu một cách nôm na nhất là nguồn âm thanh chất lượng cao, khi ghi ra đĩa CD, sẽ được những album gần với đĩa gốc nhất.

Nắm được thông tin ấy, hàng ngày, hàng trăm ‘con nghiện” audio vẫn lần mò trên Internet, lùng sục tìm kiếm trên các diễn đàn âm thanh để tìm thứ nhu liệu thần kỳ này.

Về nhạc lossless

Âm thanh ghi trên đĩa CD sử dụng định dạng file WAV với chuẩn định dạng pulse-code modulation (PCM). Đây là những tín hiệu âm thanh gốc, không bị nén. Những định dạng khác như mp3, wma, aac, ogg, mpc đều bị nén, làm âm thanh bị sai lệch rất nhiều so với thực tế. Với nhạc lossless, đầu vào là âm thanh gốc của CD, các phần mềm nén luôn cố gắng nén giữ liệu mà không làm mất chi tiết. Khi giải nén hoặc khi nghe trực tiếp lossless, âm thanh tạo ra sẽ gần với tín hiệu từ CD gốc nhất.

Về kỹ thuật lossless

Để nén nhạc theo định dạng lossless, người ta sử dụng phần mềm  Exact Audio Copy hoặc Monkey Audio Compressor. Để nghe nhạc mà không bị thêm bớt thay đổi các dải tần, người ta sử dụng phần mềm Foobar2000. Để ghi đĩa, có thể sử dụng phần mềm Nero burning hoặc Burrrn - một phần mềm miễn phí đặc biệt. Tất cả đều có thể tìm thấy dễ dàng trên Internet.

Nguồn: ST

(Ai có nhu cầu về phần mềm và nhạc lossless, thì mình cũng có 1 ít, khoảng 100GB)

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