Algorithms:
https://leetcode-cn.com/problems/balanced-binary-tree/
Balanced binary tree.
Review:
Tips:
PCM/ADPCM :
The basic parameters of the PCM sampling frequency and bit depth sampling, the sampling frequency is sampled many times per second, the bit depth is converted into sound by the microphone signal level is quantized fineness also represents how many bits will be time saved with the sample. Common CD is 44100 samples per second times, each note of the sampling level height may fall 65,535 in one level, and in order to save 16bit. The volume of the final document is 44100 samples multiplied by 2 channel 16bit time is multiplied by the total number of seconds.
ADPCM is calculated by the two adjacent sampling prediction value, then the difference between the predicted value and the next sampling factor of the scale factor table set in advance as a similar operation to obtain a lot smaller than the raw data and the results of store, how many bits the result may be stored previously set, or set to be small, such as 4bit 8bit can achieve high compression ratio, because the volume calculation formula stored in each bit samples are greatly reduced, and then playback to rebuild the inverse waveform.
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