Synaesthesia in poetry appreciation refers to mobilizing various senses such as vision, hearing, smell, touch and feeling to communicate and transform with each other, so as to describe what the poet sees and hears more vividly and express the theme and emotion of poetry. Audio-visual combination emphasizes the mutual feeling between eyes and ears, and describes it from different angles such as vision and hearing, so that readers can combine the state of things seen by eyes with the sound heard by ears, feel the picture through listening, and feel the sound through looking, which is similar to synaesthesia, so as to achieve audio-visual communication and sensory synchronization, thus forming a narrative or lyric that uses audio-visual language skills to consciously guide and express attitudes.
Audio-visual combination, described from the visual and auditory perspectives, set off each other and complement each other, making the described scenery more three-dimensional, forming a picture in poetry and sound in painting, which makes readers immersive. Readers can combine the exact content expressed in the picture with the background sound floating in their ears, and connect this atmosphere and situation with the emotional side of their own thoughts, just like being in a poem and feeling the content and emotion that the poem wants to convey. This structural feature of audio-visual combination is enough for people to get unparalleled aesthetic experience under the double impact of pictures and hearing, and then sublimate their emotional realm, which is the beauty of perfect audio-visual combination. Autumn Night in the Mountain, written by the Tang Dynasty poet Wang Wei, is a masterpiece of poetry combining audio and video. There are two couplets in the poem, "Moonlight in the pine forest, crystal stone in the stream", which are picturesque, while the two couplets, "The sound of the laundry girl returning to the bamboo and the sound of the lotus leaves in front of the fishing boat", are the sound of writing, that is, I heard the noise of the bamboo forest, but I didn't see him. I heard his voice first, which reflected the quiet and simple life pursued by the author. An Autumn Night in the Mountain is written by combining audio and video, which is more realistic and poetic.