Motherboard front-mounted audio Interface Connection manual

At present, there are a lot of users, when the mic is connected before the connection can not be successful. Here is a detailed description of the wiring method of the front microphone for your reference.

　　I. Intel specification for front-facing audio interfaces

Intel has regulated the front audio interface sockets, cable, and pin names for motherboards and chassis in the Front Panel I/O connectivitydesign Guide. The contents are as follows:

2.3 Audio Connector

2.3.1 Universal Mode

The connector design should support the use of standard front panel microphones and headphones. To be able to use audio directly without the need for special software. 5AU

2.3.2 Feature I

The front panel ' audio connector is designed to support stereo audio output (headphones or active speakers) as well as mic input (one mono).

The mic input (one mono) is connected to a 3.5 mm miniature receptacle mounted on the front panel. The core of the socket is terminated by the mic input signal and the outer ring is terminated with the microphone audio bias signal.

2.3.3 Electrical Matters

Two front panel audio outputs (aud_fpout_l and Aud_fpout_r) and two front panel audio returns (aud_ret_l and Aud_ret_r) are connected to a 3.5 mm miniature receptacle mounted on the front panel on the switch type. The audio signal transmission path is: When the current panel socket is not used, the audio signal of the motherboard output is sent to the front panel socket by aud_fpout_l and Aud_fpout_r. Go through the front panel sockets and return the rear audio sockets of the motherboard by aud_fpout_l and Aud_fpout_r. When the current audio socket is plugged into the headset, the switches in the socket (aud_fpout_l and Aud_ret_l,aud_fpout_r and Aud_ret_r) are disconnected, the audio signal to the motherboard is disconnected, the rear socket has no audio signal, and there is no audio signal on the front.

Note: Audio output can only use headphones or active speakers, if the use of passive speakers, the sound is very small.

2.3.4 Motherboard Connection Seat design

Figure 1 motherboard front-facing audio interface

2.3.5 Pin Assignment-GP

Table 1 Front audio connection seat signal name

Pin Signal Name Description

1 aud_mic_in front mic input.

2 AUD_GND grounding for analog audio circuits.

3 Aud_mic_bias mic bias voltage.

4 AUD_VCC Filter for analog audio circuit use.

5 Aud_fpout_r output to the front of the right channel audio signal.

6 Aud_ret_r the right channel audio signal returned from the front.

7 hp_on for later control headphone amplifier retention

8 KEY without pins.

9 aud_fpout_l output to the front left channel audio signal.

The left channel audio signal returned from the front aud_ret_l.

2.3.6 jumper

If the front audio cable is not connected to the front audio connection seat of the motherboard, the 5 and 6,9 and 10 pins of the connecting seat should be shortened with jumpers, otherwise the rear audio outlet is invalid.

　　Second, front headphone sockets and microphone sockets

Common front headphone sockets and MIC sockets are shown below:

Figure 2

Each outlet in the figure has a switch-type and non-switching type. According to Intel's specifications, the headphone socket is switch-type, the mic socket can be used non-switch type. Now some chassis factory to reduce costs, front-mounted headphone sockets are also non-switch type. Switch-type and non-switch pin wiring are shown below:

Figure 3

Figure 4 in 1 of the socket is a standard switch-type (5-pin), 2 of the socket is a simplified type without switch (3-pin), 3 is the microphone socket. The first standard switch type headphone socket has 5 pins, of which 5, 9 is the right left channel output, 9, 10 is the right and left channel return. This receptacle and microphone socket wiring together a total of 8, of which 2 ground can be combined so that the connection line at least 7. The second kind of simplified non-switch type socket does not have 6, 10 pins, the left and right channels of the return line and the output line is merged, so on the one end of the connection to the motherboard output line must be divided into two plug caps, in order to short-connect 5, 6 and 9, 10, to ensure that the rear socket connection audio output. The pins of the socket in the figure are labeled with the Intel Specification name and PIN number, and the connection lines of the two sockets are shown as follows:

Figure 4

Figure 4 in 1 is the standard plug cap, 4 headphones, 2 mic, 1 ground. Although the line name is not exactly the same as the Intel specification, it can be seen (then the small pin caps cannot print so many words). Line out Rl/line out RR is the right channel output/return, line out Fl/line out FR is left channel output/return. GND is the ground, mic in is the microphone input, mic power is the microphone bias voltage. The number on the left is the pin number of the corresponding motherboard front audio socket.

Figure 2 the audio output line socket for non-switch sockets for the absence of left and right channel audio signal return lines. The output lines of the left and right channels are divided into two caps for 5, 6 and 9, 10 short. In order for the rear socket to function properly, a short-connect plug cap is attached to the output line plug. So there are two spkout R, two Spkuot L. The number on the left of the figure is the pin number of the corresponding motherboard front audio socket JAUD1.

The following is the circuit board of the two audio sockets, which can be distinguished from the markings in the diagram.

Figure 5 (Standard)

Figure 6 (Simplified):

　　Third, the headset plug

in general, the front audio is mainly used to connect the headset, the headset plug is headphones and Mike separate, are using three-core plug. Mike is basically a condenser microphone, the connection line only two, the standard method is the two core short to a left microphone output line, the jacket as I ground wire, as shown below.

Figure 7

The following figure is a signal connection of the standard headset plugs for each contact head:

Figure 8

　　Four, top star motherboard front-mounted audio interface

the top-star motherboard front audio interface is fully designed according to Intel's specifications and the name of the interface is JAUD1. The two types of chassis front audio sockets and connection cables connected to the JAUD1 are as follows.

Fig. 9, the connection diagram of the standard 7-wire 7 head:

Figure 10, simplifying the connection diagram of the 5-wire 7 head:

　　Top Star Part HD Audio motherboard's Front audio interface

the ICH6 integrated with the intel® 915/925 chipset integrates a new sound processor-audio processor with high Definition Audio, Azalia link with an external codec connection, and a single-work bandwidth of 24mb/s. The duplex bandwidth reaches 48mb/s, supports multi-channel input and output, supports 32bit, 192kHz 8-channel (7.1-channel) output, supports Dvd-audio and SACD, multi-stream capability, Dolby Digital standard (Dolby numeral), and Dolby Thx surround ex features ( Dolby THX surround EX) enables the PC to reach the home theater-class Hi-fidelity audio system.

In terms of audio device connection and interface support automatic detection and automatic definition interface, not only can determine which port which device is plugged in, but also can define the function for the interface, such as the user to insert the microphone into the audio output interface, HD audio can detect the interface has a device connection, and can automatically detect the device type, The interface is defined as the mic input interface and the original interface properties are changed. So the pin of the front output interface has a new definition.

The top star part HD Audio motherboard features a 8-channel ALC880 audio codec chip, fully supports Intel's 1.0 version of the high-fidelity audio specification, supports the multi-streaming feature, and supports universal front audio sockets. The identification of the motherboard's front audio output interface is JAUD2. The pins are defined as follows:

Figure 11

Pin Signal Name Description

1 Port 1L Analog Port 1-left channel

2 GND Ground

3 Port 1R Analog Port 2-right channel

4 presence# Activate low signal-when a high-fidelity audio dongle is plugged in, the presence# signal drops to 0, notifying the BIOS that a high-fidelity audio dongle is connected to the front-facing audio interface.

5 Port 2R Analog Port 2-right channel

6 Sense1_retirn Front audio Socket 1 detection signal return

7 Sense_send High Fidelity Audio decoder chip socket detection resistor network socket detection sensor line

8 KEY anti-stick pin

9 Port 2L Analog Port 2-left channel

2 Sense2_retirn front audio socket signal return

Note: Here the dongle is not a dongle, is a device detection dog, embedded hardware at any time to detect whether there is a device access and can identify what device, automatically load the relevant software, to achieve true "plug and play."

As a result, the 915/925 motherboard's two front-facing audio sockets no longer have headphones, Mac points, which can be inserted arbitrarily. However, the two audio sockets on the front panel of the chassis must be the switch-type (5-pin) described earlier, which is not possible without a switch (3-pin). As shown in the following figure.

Figure 12

So configuring the chassis for HD Audio motherboards is a good choice for HD Audio chassis, or for HD audio dedicated.

Using the current 3-pin mic socket chassis, microphone sockets can not be plugged into stereo speakers, can only plug the headset. Software settings are required when using the front-facing mic. Go to the Sound recording section of the Sounds and Audio Devices Properties dialog box. The default setting for this item is C-media Azalia Rear panel, which switches it to C-media Azalia Front panel.

The following figure:

Figure 13

　　Six, the problem of front-mounted microphone connection

Front audio port connection, headphones generally do not have any problems, Mike will often have problems, because some chassis of the front microphone socket wiring method is not standard. The following diagram lists the differences between standard and non-standard wiring:

Figure 14

The standard wiring has three lines: ground, mic input, mic offset. There are two non-standard lines: ground and mic input, and the mike offset is saved. Non-standard 1 is the socket 1, 3 short, non-standard 2 is 3 feet empty. These two kinds of mic_in to the JAUD1 1 feet can be used. Non-standard 3 is to put 2, 3 short, non-standard 4 is the mic_in to 3 feet, these two plugs into the standard plug of the microphone must be no sound, unless also with the corresponding connection of the non-standard plug microphone.

　　Seven, front-facing audio cable

The front audio cable is also specified in the Intel specification: the left and right channels, the mic, and the aud_vcc/hp_on are all paired, and the lines are combined to shield the outer layer. Refer to the following image:

Figure 15

The domestic chassis does not see a front audio line that conforms to this standard. This standard audio line reduces interference and reduces noise. This audio cable may be available for 915/925 chassis that are specially equipped.

Add:

Part V HD Audio best describes the Ac97/azalia option settings in the BIOS settings, or the BIOS will be set to Azalia after the sound card in the Control Panel, then the settings are no sound.