N900 Hardware Audio Codec - Revision history

188.195.163.148: /* Hardware */

188.195.163.148 — Sun, 05 Jan 2014 22:12:47 GMT

Hardware

← Older revision		Revision as of 22:12, 5 January 2014
Line 3:		Line 3:
	==Hardware==		==Hardware==

-	The audio codec is a low-power 4 channel codec [http://focus.ti.com/docs/prod/folders/print/tlv320aic34.html ~~From TI~~].	+	The audio codec is a low-power 4 channel codec IC [http://focus.ti.com/docs/prod/folders/print/tlv320aic34.html TLV320AIC34].

	It is connected to the CPU using [[N900 Hardware Bus I2C\|I2C]] and the MCBSP serial digital audio interface.		It is connected to the CPU using [[N900 Hardware Bus I2C\|I2C]] and the MCBSP serial digital audio interface.

speedevil: /* Hardware */

speedevil — Thu, 12 Aug 2010 18:14:23 GMT

Hardware

← Older revision		Revision as of 18:14, 12 August 2010
Line 6:		Line 6:

	It is connected to the CPU using [[N900 Hardware Bus I2C\|I2C]] and the MCBSP serial digital audio interface.		It is connected to the CPU using [[N900 Hardware Bus I2C\|I2C]] and the MCBSP serial digital audio interface.
		+	===Unutilised Functions===
		+	The audio codec supports a flexible digital filter on both the input and output.
		+	This can be used to perform equalization with no CPU load.
		+
		+	This function is not used, and pulseaudio is used for this task when speakers are enabled.
		+
		+	It can also route the audio directly from the FM receiver to the speakers or the headphones, optionally through this hardware EQ module, also reducing power in this usecase, by entirely eliminating CPU usage.

	==Software==		==Software==

speedevil: /* Hardware */

speedevil — Thu, 12 Aug 2010 18:11:23 GMT

Hardware

← Older revision		Revision as of 18:11, 12 August 2010
Line 4:		Line 4:

	The audio codec is a low-power 4 channel codec [http://focus.ti.com/docs/prod/folders/print/tlv320aic34.html From TI].		The audio codec is a low-power 4 channel codec [http://focus.ti.com/docs/prod/folders/print/tlv320aic34.html From TI].
		+
		+	It is connected to the CPU using [[N900 Hardware Bus I2C\|I2C]] and the MCBSP serial digital audio interface.

	==Software==		==Software==

speedevil: /* Kernel */

speedevil — Thu, 12 Aug 2010 18:06:46 GMT

Kernel

← Older revision		Revision as of 18:06, 12 August 2010
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	===Kernel===		===Kernel===
		+
		+	The codec is driven by [http://mxr.maemo.org/fremantle/source/kernel/sound/soc/omap/rx51.c a driver built into the kernel].
		+
	[[Category:N900 Hardware]]		[[Category:N900 Hardware]]

speedevil: Flesh out slightly.

speedevil — Thu, 12 Aug 2010 17:57:22 GMT

Flesh out slightly.

← Older revision		Revision as of 17:57, 12 August 2010
Line 6:		Line 6:

	==Software==		==Software==
		+	===User===
		+	The audio codec is driven by pulseaudio, through ALSA.
		+	The ALSA interface is usually not exposed in maemo 5 - adding:
		+	<pre>
		+	pcm.real {
		+	type hw
		+	card 0
		+	}

		+	ctl.real {
		+	type hw
		+	card 0
		+	}
		+	</pre>
		+	to /etc/asound.conf enables a hardware device.
		+	Stopping pulseaudio may be required to use this.
		+
		+
		+	===Kernel===
	[[Category:N900 Hardware]]		[[Category:N900 Hardware]]

amigadave: wikify slightly, categorize

amigadave — Wed, 09 Jun 2010 11:44:24 GMT

wikify slightly, categorize

← Older revision		Revision as of 11:44, 9 June 2010
Line 1:		Line 1:
-	The Audio codec ~~codecs~~ audio.	+	The Audio codec encodes and decodes audio.
-	=Hardware=	+
		+	==Hardware==
		+
	The audio codec is a low-power 4 channel codec [http://focus.ti.com/docs/prod/folders/print/tlv320aic34.html From TI].		The audio codec is a low-power 4 channel codec [http://focus.ti.com/docs/prod/folders/print/tlv320aic34.html From TI].
-	=Software=	+
		+	==Software==
		+
		+	[[Category:N900 Hardware]]

speedevil: New page: The Audio codec codecs audio. =Hardware= The audio codec is a low-power 4 channel codec [http://focus.ti.com/docs/prod/folders/print/tlv320aic34.html From TI]. =Software=

speedevil — Mon, 07 Jun 2010 16:04:30 GMT

New page: The Audio codec codecs audio. =Hardware= The audio codec is a low-power 4 channel codec [http://focus.ti.com/docs/prod/folders/print/tlv320aic34.html From TI]. =Software=

New page

The Audio codec codecs audio.
=Hardware=
The audio codec is a low-power 4 channel codec [http://focus.ti.com/docs/prod/folders/print/tlv320aic34.html From TI].
=Software=