Ping refers to straightness, and oblique refers to twists and turns. According to the rhyme books revised from the Sui Dynasty to the Song Dynasty, such as "Qie Yun" and "Guang Yun", there are five tones in Medieval Chinese, called Ping (Yin Ping, Yang Ping), Shang, Qu, and Ru. Except for the flat tone, the other three tones have changes in pitch, so they are collectively called oblique tones. There is a certain pattern for the use of oblique words in poetry, which is called meter.
Ping tones and oblique tones refer to the rhythm of poetry composed of oblique and oblique tones. Pingchi is an attempt to dualize the four tones. The four tones are the four tones in ancient Chinese. The so-called tone refers to the pitch, rise and fall, and length of the voice. Ping and Ze are summarized using incomplete induction method on the basis of the four tones. Ping refers to straightness, and Chi refers to twists and turns. Extended information
In Chinese, Ping and Ling refers to the speed of speaking. The final a is pronounced a loudly and is also a when pronounced softly. When the number of decibels is roughly the same, the a sound is louder than the o sound. Because the opening of a is large. Therefore, equal weight, level weight and lightness are not established.
The controversy between Ping Ze and informal Ping Ze is caused by the lack of practical understanding of Ping Ze in academic circles. From mathematical principles, Ping and Ze are based on incomplete induction. From the perspective of physics, we can better understand Pingqi through the songs.
Baidu Encyclopedia-Pingzhi