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Chapter 9. Media Streaming > Audio Streaming

9.4. Audio Streaming

Above the transport layer is the media-coding layer. Sound is typically captured using an Analog to Digital Converted (ADC) device, which periodically samples and converts a continuous measure of pressure into a discrete digital value. The two parameters that control that process are sample rate and resolution. The sample rate is the frequency at which the signal (e.g., pressure) is sampled. The resolution is the number of bits used by the ADC to digitize the continuous pressure level. Usually the bit and sample rates are some multiple of 44,100 samples per second and 16 bit samples.

There are two major audio streaming formats: MPEG-2 dolby AC-3. DVB audio is MPEG-2 based and follows a ISO/IEC 13818-3, with the minimum requirements for the interoperability of baseline receivers as specified in TR 101 154. ATSC Audio, A52, is based on dolby AC-3. Both formats are derivatives of PCM audio.


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