1. Technical Field
The present disclosure relates to test devices and, particularly, to an audio test cable.
2. Description of Related Art
Motherboards typically include audio input and output (I/O) ports for inputting and outputting audio signals. After being assembled, the motherboards need to pass various audio tests to ensure quality. However, there are three types of audio I/O ports, such as an audio jack, a pin header, and a jack and socket (JST), and two types of audio tests, such as a loopback test and an audio-quality test, and each type of audio I/O ports requires a corresponding cable to conduct each type of audio test. As such, six types of cables are required by the audio tests, which is convenient.
Therefore, it is desirable to provide an audio test cable, which can overcome the above-mentioned problems.
Many aspects of the present disclosure can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the views.
Embodiments of the present disclosure will now be described in detail with reference to the drawings.
Referring to
Each of the input audio jack 22 and the output audio jack 24 defines a hole of a 3.5 mm diameter (that is, the input audio jack 22 and the output audio jack 24 are 3.5 mm audio jack) and each includes a left channel (LC) positive terminal, a right channel (RC) positive terminal, and two grounding terminals extending in the hole and connected to an audio processing chip of the motherboard 10 and 30.
The input pin header 26 and the output pin header 28 each include an LC positive pin, an RC positive pin, and two grounding pins arranged in a line at a 2mm pitch.
The input JST 32 and the output JST 34 each include an LC positive pin, an RC positive pin, and two grounding pins arranged in a line at a 2.54 mm pitch.
To conduct the loopback test for the motherboard 10 or 30, each audio input port, such as the input audio jack 22, the input pin header 26, or the input JST 32, should form a short circuit with a corresponding audio output port, such as the output audio jack 24, the output pin header 28, or the output JST 34. As such, test audio signals can be sent out from the motherboard 10 or 30 via the audio output port and back to the motherboard 10 or 30 via the corresponding audio input port to detect if there is data loss in the transmission of the test audio signals. If there is no data loss, the motherboard 10 or 30 passes the loopback test. If no, the motherboard 10 or 30 is rejected.
To conduct the audio-quality test for the motherboard 10 or 30, each audio output port, such as the output audio jack 24, the output pin header 28, or the output JST 34 should be connected to a speaker 40 (or an earphone). Test audio signals are sent to and played by the speaker 40 (or the earphone) to determine if the audio-quality is acceptable. If yes, the motherboard 10 or 30 passes the audio-quality test. If no, the motherboard 10 or 30 is rejected.
Also referring to
As such, the test cable 100 can mate with the three main types of audio I/O ports of motherboards using the input audio connector 200, the output audio connector 202, the input pin header socket 300, the output pin header socket 302, the input JST female 400 and output JST female 402. After the test cable 10 is mated with each type of I/O ports of the motherboard 20 or 30, the LC positive terminal/pin, the RC positive terminal/pin and the grounding terminal/pins of the audio input port form respective short circuits with those of the audio output port. As such, the loopback test can be carried out. After the speaker 40 is mated with a specific type of audio output port using a test audio connector 42, the audio-quality test can be carried out. That is, the test cable 100 can be used for both the three types of audio I/O ports and the two main audio tests.
The above particular embodiments are shown and described by way of illustration only. The principles and the features of the present disclosure may be employed in various and numerous embodiments thereof without departing from the scope of the disclosure as claimed. The above-described embodiments illustrate the possible scope of the disclosure but do not restrict the scope of the disclosure.
Number | Date | Country | Kind |
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201110260320.7 | Sep 2011 | CN | national |