| 摘要 |
A specification discloses an 'audio direct inject box' ('direct box') 1 which is used to take a single ended audio signal from an audio source (such as a guitar, a keyboard 2 or a DJ mixer) and convert it to a balanced (differential) signal 12. The unit includes an attenuator controlled by the input signal level. The unit also includes power supply circuitry adapted to receive power from a mixing desk. The unit allows unbalanced audio sources to be connected to mixers via balanced microphone cables. |
