Hi-Res Audio
An industry term used to describe digital audio and devices with specifications higher than those of audio CDs or with a wider recording bandwidth; common file specifications include 24-bit/96 kHz, 24-bit/192 kHz, and DSD.
Explanation
高解析度音频 (High-Resolution Audio, Hi-Res Audio) is an industry term used for digital recording, distribution, and playback devices, typically referring to audio that exceeds the CD-DA 44.1 kHz, 16-bit specifications. It is not a single encoding standard; PCM, FLAC, ALAC, WAVE, AIFF, and DSD may all carry content classified by the market as high-resolution.
Definitions vary among different organizations and manufacturers. Consumer files are often cited as typical examples at 24-bit/96 kHz or higher PCM, while the Japan Audio Association’s device certification also covers analog frequency response, digital processing capabilities, and product category requirements. Some players display a “Hi-Res” label simply upon detecting parameters higher than 44.1 kHz/16-bit; this interface rule does not equate to verification of the source or effective bandwidth.
“High-resolution” describes release parameters, not the authenticity of the master recording.
24-bit files may be padded with 16-bit data, and 192 kHz files may be upsampled from lower sampling rates; analog tapes, digital intermediate media, and early digital recordings also have their own bandwidth and noise limitations. The cutoff point in the spectrum can provide clues, but low-pass filtering, noise reduction, sample rate conversion, and ultrasonic noise during production can all affect the graph; authenticity cannot be determined by a single screenshot.
High sampling rates and high bit depths provide headroom for quantization and filtering during recording, mixing, and signal processing; however, the final sound quality still depends on the recording, master, loudness processing, converters, and playback environment. When comparing with a CD version, it is also essential to confirm whether the same master was used; differences between the two versions may stem from dynamic processing rather than sampling parameters.
“Hi-Res Audio” and “lossless” are not synonymous. 16-bit/44.1 kHz FLAC is lossless but is not typically referred to as high-resolution, while 24-bit high-sampling-rate files may use lossy encoding. Databases should record encoding, sampling rate, bit depth, channels, and source information separately.