How do I delete a custom ringtone?

Open the phone settings, find the sound and vibration, select the ringtone category to be deleted, turn on the custom ringtone, then return to the desktop to open I music, click on the local song, find the custom ringtone to be deleted according to the first letter of the song name, click the three points on the right side of the ringtone, and then select Delete.

Speaking of mp3 ringtones, first of all, it should be mentioned that MPEG is the abbreviation of moving picture expert group. Established in 1988, this expert group is responsible for establishing video and audio compression standards for CDs.

MPEG audio file refers to the sound part of MPEG standard, namely MPEG audio layer. According to the different compression quality and coding complexity, MPEG files can be divided into three layers (mpegudiolayer 1/2/3 corresponding to mp 1, mp2 and mp3 respectively. MPEG audio coding has a high compression rate.

The compression rates of mp 1 and mp2 are 4: 1 and 6: 1-8: 1 respectively, while the compression rate of mp3 is as high as10:12:/kloc-. Therefore, mp3 is the most common music format on the Internet at present.

Finally, an mp3 file with high compression ratio is formed, and the compressed file can achieve a sound effect closer to the original sound source when playing back. Although it is a kind of lossy compression, its greatest advantage is that it gains a higher compression ratio with very little sound distortion.

Mp3 bits reduce sound distortion by adopting a coding algorithm called "sensory coding technology": when coding, the audio file is analyzed in frequency spectrum, then the noise frequency is filtered by a filter, and then the remaining bits are scattered and arranged by quantization.