HP dx7300 5.8Audio Subsystem, Mic, Out, Out, Line, Line, Headphones

Input/Output Interfaces

5.8Audio Subsystem

These systems use the HD audio controller of the 82801 component to access and control a Realtek ALC262 HD Audio Codec, which provides 2-channel high definition analog-to-digital (ADC) and digital-to-analog (DAC) conversions. A block diagram of the audio subsystem is shown in Figure 5-10. All control functions such as volume, audio source selection, and sampling rate are controlled through software through the HD Audio Interface of the 82801 ICH component. Control data and digital audio streams (record and playback) are transferred between the ICH and the Audio Codec over the HD Audio Interface. The codec’s speaker output is applied to a 1.5-watt amplifier that drives the internal speaker. A device plugged into the Headphone jack or the line input jack is sensed by the system, which will inhibit the Speaker Audio signal.

Theses systems provide the following analog interfaces for external audio devices:

Mic In—This input uses a three-conductor mini-jack that accepts a stereo microphone. This is the default recording input after a system reset. On MT/CMT systems with both front and rear microphone jacks, either jack is available for use (but not simultaneously).

Line In—This input uses a three-conductor (stereo) mini-jack that is specifically designed for connection of a high-impedance audio source such as a tape deck.

Headphones Out—This input uses a three-conductor (stereo) mini-jack that is designed for connecting a set of 32-ohm (nom.) stereo headphones. Plugging into the Headphones jack mutes the signal to the internal speaker and the Line Out jack as well.

Line Out—This output uses a three-conductor (stereo) mini-jack for connecting left and right channel line-level signals. Typical connections include a tape recorder's Line In (Record In) jacks, an amplifier's Line In jacks, or to powered speakers that contain amplifiers.

82801 ICH

HD Audio

Interface

PC Beep

HD Audio I/F

		Line Audio (L/R)					Header
Line In				Speaker			P6
		Header		Audio (mono)		Audio
						Amp
		P23
Front Panel		Mic Audio (L/R)
Mic In			ALC262	Header
			HD Audio	Headphone	P23
		Mic Audio (L/R)		Audio (L/R)			Headphones
			Codec
Rear Panel							Out
Mic In [1]				Line Audio
	Header
				Out (L/R)
	P11 [2]						Line Out
Aux Audio In		Audio In (L/R)

NOTES:

L/R = Separate left and right channels (stereo). L+R = Combined left and right channels (mono).

[1]MT/CMT only

[2]SSF, ST, MT, and CMT only.

Figure 5-10. Audio Subsystem Functional Block Diagram

Technical Reference Guide www.hp.com 5-27