November 8, 2019   |   by admin

When a headphone is plugged into the front panel jack, the audio signal goes to the headphones; the return pins are disconnected, so no audio signal goes to the speakers. Consequently, a loud audio passage may make the HDA motherboard with AC’97 dongle believe that headphones and microphones are being plugged and unplugged hundreds of times per second. High Definition Audio Specification This document is divided into seven chapters. Intel products Sound cards. Chapter 5 describes the High Definition Audio physical link protocol. Chapter 7 describes the High Definition Audio codec architecture. Safari Chrome IE Firefox.

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Many motherboards with AC’97 audio need two jumpers to short the pins in case no front panel audio module is connected, so audio passes to the speakers. From Wikipedia, the free encyclopedia.

Intel products Sound cards. Codec hardware designers and software programmers will find this chapter of interest. Technical and apc880 facto standards for wired computer buses.

Intel provides a specification for that header, but the signal assignments are different for AC’97 and HD Audio headers. Views Read Edit View history. When a plug is inserted, the stereo signals contact the respective channels on the plug and are disconnected from the jack’s return pins. Fab 28 ISO Features of the specification include: Fab 11X ISO HD Audio can sense the presence of an audio dongle. Chapter 4 is a software programming reference designed to aid in the development of High Definition Audio compliant software, including controller and codec programming.


The motherboard can determine if the dongle is plugged in by examining the logic level on pin 4. It is strongly recommended that motherboard designers only use Intel HD Audio analog front panel dongles with the Intel HD Audio analog front panel header to insure that the jack detection and dynamic re-tasking capability is preserved.

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Read the full High Definition Audio Specification. Software programmers and controller hardware designers will find this chapter of interest. Even though the actual audio hardware is HD Audio, it will allow using the AC’97 front panel that way. By using this site, you agree to the Terms of Use and Privacy Policy. Like AC’97, HD Audio is a specification that defines the architecture, link frame format, and programming interfaces used by the controller on 882 PCI bus and by the codec on the other side of the link.

Interfaces are listed by their speed in the roughly ascending order, so the interface at the end of each section should be the fastest. Not present, physical key. Chapter 2 provides an introduction to the High Definition Audio architecture.

When the plug is inserted, the isolated switch inside the jack informs the motherboard, and the codec sends audio to the headphones. Chapter 6 describes the physical link electrical requirements necessary for interfacing High Definition Audio controllers with codecs on the link. Chapter 3 describes the details of a High Definition Audio controller Please consider upgrading to the alc80 version of your browser by clicking one of the following links.


This chapter is of primary interest to those writing High Definition Audio compliant software or to readers looking for more detail about the functionality of the hardware. Consequently, an HDA motherboard would not detect the presence of an AC’97 dongle with a disconnected pin 4.

Fab 68 ISO High Definition Audio Specification. For the microphone jack, the return signal pins ground the microphone input when the microphone is not plugged in.

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Webarchive template wayback links Articles containing potentially dated statements from All articles containing potentially dated statements All articles with unsourced statements Articles with unsourced statements from November A similar isolated switch is used to detect when a microphone has been plugged in.

Chapter 1 is an introduction 828 the specification. If the headphones are not plugged in, the jack directs the audio to the return pins that are connected to the speakers.