| 摘要 |
A circuit arrangement for transmitting audio signals includes a signal amplifier having four power amplifiers each with an input and an output, a first and a third one of the four power amplifiers are non-inverting for applied audio signals, and a second and a fourth one of the four power amplifiers are inverting, the inputs of the first and second power amplifiers receiving a first audio signal and the inputs of the third and fourth power amplifiers receiving a second audio signal. In a first configuration mode for audio signals of low amplitude, the first and fourth power amplifiers each form a single-ended amplifier and the outputs of the second and/or the third power amplifier carry a reference potential. In a second configuration mode for audio signals of higher amplitude, the first and second power amplifiers form a first bridge amplifier, and the third and fourth power amplifiers form a second bridge amplifier. The outputs of the first and second power amplifiers are arranged for the connection of a first signal sink and the outputs of the third and fourth power amplifiers are arranged for the connection of a second signal sink. An automatic change-over to the second configuration mode IS effected if the signal sinks include further amplifier arrangements. At very low cost this also provides compatibility for a symmetrical signal amplifier with signal sinks having asymmetrical inputs.
|
