| 摘要 |
An appliance (1) comprises an audio port, which is usable as an interface for testing of the appliance. In a preferred embodiment, the appliance comprises stereo output ports, one port for a reception of digital test signals from a control computer (3) and the other port for a transmission of digital signals from the appliance to the control computer (3). For the separation of the test signals and the audio signals a test adapter (2) is used which is coupled between the appliance (1), the control computer (3) and an amplifier for the audio signals. The test signals are modulated onto a carrier signal having a frequency of above 20 kHz, for example a frequency within the frequency range of 1 - 10 MHz. This allows a serial connection, which is compatible with the widely used RS232 link for set-top boxes.
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