Sound source device of the stereo: (for example: DVD, CD, MP3, MP4, computer, mobile phone, microphone and other sound source output devices), if the saved song is not recognized by the sound source device of the stereo , it cannot be played.

Specific solution: Change the format of stored songs to a format that the speaker can recognize. The overall technical index performance of the sound system depends on the performance of each unit. If the technical index of each unit in the system is high, then the overall technical index of the system is good. There are six main technical indicators: frequency response, signal-to-noise ratio, dynamic range, distortion, transient response, stereo separation, and stereo balance.

Extended information:

Formats that cannot be recognized by the audio:

1. MPEG

MPEG is the English abbreviation of the Moving Picture Experts Group . This expert group was founded in 1988 and is responsible for establishing video and audio compression standards for CDs. MPEG audio files refer to the sound part of the MPEG standard, the MPEG audio layer. MP3 is the most common music format on the Internet. Although it is a type of lossy compression, its biggest advantage is that it exchanges minimal sound distortion for a higher compression ratio. MPEG contains formats including: MPEG-1, MPEG-2, MPEG-Layer3, MPEG-4.

2. MIDI:

The MIDI (Musical Instrument Digital Interface) format is used by people who often play music. MIDI allows digital synthesizers and other devices to exchange data. The MID file format is inherited from MIDI. The MID file is not a piece of recorded sound, but a set of instructions that records the sound information and then tells the sound card how to reproduce the music. Such a MIDI file only uses about 5 to 10KB for each minute of music stored.

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Baidu Encyclopedia-Audio Format