Nowadays, High-Resolution (Hi-Res) audio format, which has higher sampling frequency (Fs) and quantization bit number than the Compact disc (CD) format, is becoming extremely popular. Several studies have been conducted to clarify whether these two formats can be distinguished. However, most of the studies were conducted by only using music sources to reach a conclusion. In this paper we will try to bring out the problems due to the primary use of music sources for experimental purposes. We will also answer the question related to discrimination between hi-Res and CD formats using sources other than music, such as noise.
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