![\"Audio](\"https:\/\/pbs.twimg.com\/profile_images\/979074659663601664\/btoGfwV4_400x400.jpg\")
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Features: Sound quality performance at low bitrate is hard to match.<\/p>\n
![\"Audio](\"https:\/\/st2.depositphotos.com\/1008096\/42174\/i\/600\/depositphotos_421748130-stock-photo-aac-advanced-audio-coding-acronym.jpg\")
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Applicable to: digital radio station setup, online listening, music appreciation with low requirements.
\nmp3PRO
\nAs an enhanced version of mp3, mp3PRO shows pretty good quality, with full treble. Although mp3PRO is inserted during playback via SBR technology, the actual listening experience is quite good. Although it seems a bit thin, you are already in the world of 64 kbps. There is no rival, even more than 128kbps mp3, but unfortunately, mp3PRO’s low-frequency performance is also broken like mp3, fortunately, SBR’s high-frequency interpolation can more or less cover this shortcoming, so mp3PRO’s weakness. low frequency is not as obvious as that of WMA. You can feel it deeply when you use the PRO switch of RCA mp3PRO Audio Player to switch between PRO mode and normal mode. In general, the 64kbps mp3PRO reaches the level of sound quality of the 128kbps mp3 and wins slightly in the high frequency part.
\nFeatures: The king of sound quality at low bit rates.
\nApplicable to: Music appreciation with low requirements.
\nBUN
\nAn emerging lossless audio encoding that can provide 50-70% compression ratio. Although it is not worth mentioning compared to lossy encoding, it is a boon for friends who are looking for perfect sound quality. APE can be truly lossless, not only without sound, but also with better compression than similar lossless formats.
\nFeatures: The sound quality is very good.
\nSuitable for: The appreciation and collection of music of the highest quality.
\nTransmission audio coding technology comparison
\nClassified by waveform coding, parametric coding, and hybrid coding, some typical coding methods are compared in terms of coding rate (code rate), voice quality, and application fields; see the table below for more details.
\nTable 1 Comparison of typical audio coding techniques
\ncoding technology
\nalgorithm
\nencoding standard
\nBit rate (kbit\/s)
\nquality
\nScope
\nWaveform coding
\nPCM
\nG.711
\n64
\n4.3
\nPSTN, ISDN
\nADPCM
\nG.721
\n32
\n4.1
\n–
\nSB-ADPCM
\nG.722
\n64\/56\/48
\n4.5
\n–
\nparameter encoding
\nLPC
\n–
\n2.4
\n2.5
\nconfidential voice
\nhybrid coding
\nECLAC
\n–
\n4.8
\n3.2
\n–
\nVSELPC
\nFAMILY
\n8
\n3.8
\nMobile communication, voice mail
\nLTP-RPE
\nGSM
\n13.2
\n3.8
\n–
\nLD-CELP
\nG.728
\n16
\n4.1
\nISDN
\nMPE
\nMPE
\n128
\n5.0
\nCD
\nNote: There are five levels of quality evaluation (1, 2, 3, 4, 5), of which 5.0 is the highest score.
\nFor the full Chinese and English names of various algorithms and abbreviations in the application fields in the above table, please refer to the following description.
\nPCM: pulse code modulation, pulse code modulation.
\nADPCM: Adaptive Differential Pulse Code Modulation, Adaptive Differential Pulse Code Modulation.
\nSB-ADPCM: Subband Adaptive Differential Pulse Code Modulation, Subband Adaptive Differential Pulse Code Modulation.
\nLPC: Linear Predictive Coding, Linear Predictive Coding.
\nCELPC: Code Excited Linear Predictive Coding, Code Excited Linear Predictive Coding.
\nVSELPC: Vector Sum Excited Linear Predictive Coding, Vector Sum Excited Linear Predictive Coding.
\nRPE-LTP: Regular Pulse Excited-Long Term Predictive, long-term prediction of regular pulse excitation.
\nLD-CELP: Low Delay Code Excited Linear Predictive, Low Delay Code Excited Linear Prediction.
\nMPE: Multipulse Excitation, Multipulse Excitation.
\nPSTN: Public Switched Telephone Network, public switched telephone network.
\nISDN: Integrated Services Digital Network, Integrated Services Digital Network.<\/p>\n","protected":false},"excerpt":{"rendered":"