The Andhadhun training class of Qingdao Hao Di Vocational Skills Training School is subdivided into 7-day intermediate on-the-job classes. Tuition: 800 yuan's sound theory: introduction to sound tuning, development of sound technology, composition and working principle of sound system, indoor and outdoor sound field design, measurement and sound quality evaluation of hall sound reinforcement characteristics, recording technology, video technology, stage lighting and sound reinforcement system in dance halls, etc. Audio Professional English 14-day advanced in-service class tuition: 1400 yuan's audio theory: introduction to audio tuning, development of audio technology, composition and working principle of audio system, indoor and outdoor sound field design, measurement of hall sound reinforcement characteristics and sound quality evaluation, recording technology, video technology, ballroom stage lighting and sound reinforcement system, etc. Intermediate correspondence course fee for English for audio majors: 800 yuan's audio theory: introduction to audio tuning, development of audio technology, composition and working principle of audio system, indoor and outdoor sound field design, measurement of hall sound reinforcement characteristics and sound quality evaluation, basic knowledge of recording technology, video technology, stage lighting and sound reinforcement system for dance halls, advanced correspondence course for English for audio majors: 1200 yuan. Development of sound technology, composition and working principle of sound system, indoor and outdoor sound field design, measurement and sound quality evaluation of hall sound reinforcement characteristics, basic knowledge of recording technology, video technology, stage lighting and sound reinforcement system in dance halls, tuition fee for one-month intensive class of audio English: 1800 yuan, sound theory: introduction to tuning, development of sound technology, composition and working principle of sound system, indoor and outdoor sound field design, Three-month zero-based all-round training course: 4200 sound theory: introduction to tuning, development of sound technology, composition and working principle of sound system, basic knowledge of indoor and outdoor sound field design, sound reinforcement measurement and sound quality evaluation of hall, sound recording technology, video technology, stage lighting and sound reinforcement system of dance hall. Vocal Music Theory: Basic knowledge of electroacoustic technology, generation and propagation of sound, principle of acoustoelectric transducer, common sense of music theory, hearing and hearing training, common sense of architectural acoustics and music, music frequency, room acoustics design and subjective evaluation. Exercise: Sound reinforcement, welding technology, audio cable and connector, multimeter, microphone and speaker, system connection (important), mixer (important), video equipment, lighting equipment, card holder, equalizer, feedback suppressor, voltage limiter, frequency divider, sound exciter and other peripheral digital equipment. Tuition for one-year all-round class: 6800 audio theory: introduction to audio tuning, development of audio technology, composition and working principle of audio system, indoor and outdoor sound field design, measurement of sound reinforcement characteristics and sound quality evaluation in the hall, recording technology, video technology, stage lighting and sound reinforcement system in dance halls, and basic knowledge of audio English. Electrical theory: the basic concept of safe electricity use, electricity and circuit, electromagnetic induction law, DC circuit, sinusoidal AC circuit, identification of circuit diagram, identification of electronic components, multimeter and other basic principles of electrical appliances. Basic knowledge of electroacoustic technology of vocal music theory, sound generation and propagation, principle of acoustoelectric transducer, common sense of music theory, hearing, common sense of architectural acoustics, music frequency, room acoustics design and subjective evaluation. Practical operation: sound reinforcement, welding technology, audio cable and connector, multimeter, microphone and speaker, system connection (important), mixer (important), video equipment, lighting equipment, card holder, equalizer, feedback suppressor, voltage limiter, frequency divider, sound exciter and other peripheral digital equipment. Equipment maintenance: daily repair and maintenance of peripheral equipment such as DVD player, TV, projector, microphone, power amplifier, mixer and speaker. Others: stage lighting, professional knowledge of stage lighting, professional recording studio, use of professional recording software, introduction of stage lighting equipment, principle of digital dimming equipment, operation and specification of computer lighting, VJ, DJ, MC and other professional knowledge. (