helix mobile producer on-demand user's guide - RealPlayer

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Helix Mobile Producer On-Demand User’s GuideSampling RateThe Sampling Rate column lists the codec’s optimum sample rate. Using acodec’s optimum sampling rate in your audio source file ensures that theaudio stays synchronized with other media and prevents pitch shifting duringaudio resampling. Audio quality degrades if you use lower than the optimumsampling rate.Audio input should be set at the same sample rate as required by the desiredoutput codec. In the case of SureStream encoding, the input sample rateshould be equal or greater than the largest sample rate of all codecs inincluded in the output.If you use a higher sampling rate when creating the source audio, it is best touse a multiple of the optimum rate. If the optimum rate is 8 kHz, for example,use a higher rate of 16 kHz or 32 kHz. When in doubt, use a CD-qualitysampling rate of 44.1 kHz for your source audio.Frequency ResponseA codec with a higher frequency response reproduces a wider range of soundthan a codec with a lower response. High Response is indicated after the codernameFrequency response measures how much of the original audio’s frequencyrange will be used in creating the RealAudio clip. Thus, the codec does notenhance produced audio’s quality; it always results in a clip of equal or lowerquality than the original audio. For example, if the original audio has an 8kHz frequency response, encoding it with a codec that has a frequencyresponse of 10 kHz produces a clip that still has a response of 8 kHz.For More Information: The audio preparation chapter ofRealNetworks Production Guide has an expanded list that coversall RealAudio codecs, including obsolete codecs no longer usedby Helix Producer.CompatibilitySome codecs are available for use with early versions of the RealPlayer.Compatibility is indicated below each codec type.84
APPENDIX C: Audio Codec ReferenceVoice CodecsHelix Mobile Producer On-Demand uses a voice codec when you encode avoice-only or voice-with-music clip. The lowest-speed voice codec normallyused with RealAudio is 16 kbps. The lower-speed codecs can be used as“duress” streams in SureStream clips. They are also used to encodesoundtracks for low-bandwidth RealVideo clips.Available Voice CodecsHelix Mobile Producer On-Demand offers several codecs designed specificallyfor encoding voice.RealAudio Voice CodecsCodec Name Codec ID Sampling Rate5 Kbps voice sipr2 8 kHz6.5 Kbps Voice sipr0 8 kHz8.5 Kbps Voice sipr1 8 kHz16 Kbps Voice sipr3 16 kHz32 Kbps Voice cook7 22.05 kHz64 Kbps Voice cook14 44.1 kHzPlayer CompatibilityMusic Audio Codecs• The sipr 6.5Kbps and 8.5Kbps codecs are compatible with RealPlayer 4and later.• The sipr 5Kbps and 15 Kbps codecs are compatible with RealPlayer 5 andlater.• The cook 32Kbps and 64Kbps codecs are compatible with RealPlayer G2and later.Music codecs create a higher quality of sound for audio recordings than voicecodecs. Music Audio codecs are designed to encode audio with a larger pitchvariance than voice. You will capture a broader, fuller sound with codecsdesigned for higher bit rates, but your files will be larger.85
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helix mobile producer on-demand user's guide - RealPlayer

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