Bluetooth audio transmission format-AAC

Brief introduction AAC, full name Advanced audio Coding, is a file compression format specially designed for audio data. Unlike MP3, it uses a brand-new algorithm for encoding, which is more efficient and has a higher "price ratio". The use of the AAC format can make people feel that the sound quality is not significantly reduced, and it is more compact. Apple iPod and Nokia mobile phones support audio files in AAC format.

1. Advantages: Compared with mp3, the AAC format has better sound quality and smaller files.

2. Disadvantages: AAC is a lossy compression format. Compared with the popular lossless formats such as APE and FLAC, there is an "essential" gap in sound quality. In addition, USB3.0 with faster transmission speed and large-capacity MP3 above 16G are accelerating popularization, which also makes the "small" halo on the AAC head no longer exist.

3. Features

①Improved compression rate: higher sound quality can be obtained with a smaller file size;
②Support multi-channel: can provide up to 48 full-range channels;
③Higher resolution: up to 96KHz sampling frequency;
④Improved decoding efficiency: less resources are occupied by decoding and playback;

4. Conclusion from Dolby Laboratories

①128Kbps AAC stereo music is considered by experts to be difficult to detect the difference from the original uncompressed sound source;
②The performance of the AAC format at the 96Kbps bit rate exceeds that of the 128Kbps MP3 format;
③It is also 128Kbps, and the sound quality of AAC format is obviously better than that of MP3;
④AAC is the only one that can obtain "excellent" webcast format in all EBU audition test items.

In general, AAC can be said to be a very comprehensive encoding method. On the one hand, the characteristics of multi-channel and high sampling rate make it very suitable for future DVD-Audio; on the other hand, the high sound quality at low bit rate makes it It is also suitable for fields such as mobile communications, Internet telephony, online broadcasting, etc. It is really a versatile coding method.

Our other product:

Professional lightning protection system for Tower	Professional FM Radio Station Equipment Package	FMUSER FU-1000C 1000W FM Transmitter With USB Audio Input Interface
FMUSER 200W FM Radio Broadcasting Package	Hotel IPTV Solution	FMUSER FSN-1000T V5.0 1KW FM Radio Broadcast Transmitter