HP dx7300 HP Compaq dx7300 and dc7700 Business PC Technical Reference Guide, 1 - Page 105
Audio Subsystem, Mic In, Line In, Headphones Out, Line Out
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Input/Output Interfaces 5.8 Audio 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 In Front Panel Mic In Line Audio (L/R) Header P23 Mic Audio (L/R) Rear Panel Mic In [1] Mic Audio (L/R) Header P11 [2] Aux Audio In Audio In (L/R) Speaker Audio (mono) Audio Amp Header P6 ALC262 HD Audio Codec Header Headphone P23 Audio (L/R) Headphones Out Line Audio Out (L/R) Line Out 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