1976
The classifier , based on spectral convolutional neural network , was trained to differentiate the acoustic features of dissimilar quality .
 concept or principle: neural network; concept or principle: quality
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: neural network, quality 
Answer:
 concept or principle: neural network; concept or principle: quality