When you encode an audio file, you select an encoding algorithm. The RealAudio Encoder can encode using several different algorithms. Each encoding algorithm is optimized for a particular type of audio and connection speed bandwidth. You need to select one or more algorithms that best suit your needs.

It is possible to offer more than one encoding algorithm from your RealAudio Server. In this way, you can reach the widest possible audience while still providing high-bandwidth users with the best listening experience. Using Bandwidth Negotiation, you can configure your site to automatically serve the appropriately encoded file.

Encoding Algorithm	Description	File Size per Second
RealAudio 2.0 - 14.4	Use for speech over 14.4 Kbps modems. Frequency response: 4.0 kHz	1 KB
RealAudio 2.0 - 28.8	Use for voice content and voice with background music over 28.8 Kbps modems. This option increases intelligibility under high packet loss conditions. Frequency response: 4.0 kHz	1.8 KB
RealAudio 3.0 - 28.8 Mono, full response	This option gives the brightest sound for delivery over 28.8 Kbps modems. If audio artifacts occur, encode with the medium response option. Frequency response: 5.5 kHz	2 KB
RealAudio 3.0 - 28.8 Mono, medium response	This option may improve clarity for music with snare drums, cymbals and vocals. If audio artifacts occur, encode with the narrow response option. Frequency response: 4.7 kHz	2 KB
RealAudio 3.0 - 28.8 Mono, narrow response	This option may improve clarity for speech-intensive music or noisy signals. Frequency response is somewhat reduced. Frequency response: 4.0 kHz	2 KB
RealAudio 3.0 - 28.8 Stereo	Use for general stereo content. Frequency response: 4.0 kHz	2.5 KB
RealAudio 3.0 - ISDN Mono	Use for general mono content over IDSN connections. Frequency response: 11.0 kHz	4.9 KB
RealAudio 3.0 - ISDN Stereo	Use for stereo content over ISDN connections. Frequency response: 8.0 kHz	4.9 KB
RealAudio 3.0 - Dual ISDN Mono	Use for optimal quality for mono content. Frequency response: 20.0 kHz (CD Quality)	9.8 KB
RealAudio 3.0 - Dual ISDN Stereo	Use for optimal quality for stereo. Frequency response: 16.0 kHz (Broadcast Quality)	9.8 KB

Continue to How to Encode a File

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