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Low fidelity or lo fi (adjectival form "low-fidelity" or "lo-fi") is a type of sound recording which contains technical flaws that make the recording sound different compared with the live sound being recorded, such as distortion, hum, background noise, or limited frequency response. The term "low-fidelity" is used in contrast to the audiophile term high fidelity or "hi-fi", which refers to equipment that very accurately reproduces music without harmonic distortion or unwanted frequency emphasis or resonance. The ideas of lo-fi are taken to extremes by the genre or "scene" of no fidelity, or "no-fi". Some lower-budget recordings from the 1970s and 1980s have an unintended "lo-fi" sound because of the limitations of the analog recording and processing techniques of the time, which introduced unwanted artifacts such as distortion, hum and phase problems. In some recordings, however, high fidelity recording is purposely avoided, or the artifacts such as simulated vinyl record crackles are