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products:sbc:vim3:applications:earc

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products:sbc:vim3:applications:earc [2023/11/08 21:11]
nick 		products:sbc:vim3:applications:earc [2023/11/08 23:08] (current)
sravan
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 ===== Introduction ===== ===== Introduction =====
  
-The eARC is a feature implemented in the latest HDMI 2.1 specification, the biggest advantage is that it exceedingly improves bandwidth and speed. \\ +eARC is a feature implemented in the latest HDMI 2.1 specification, This allows you to transmit high-quality audio from your TV to your Soundbar or AV receiver and is compatible with the high bitrate formats Dolby Atmos and DTS.
-This allows you to transmit high-quality audio from your TV to your Soundbar or AV receiver and is compatible with the high bitrate formats Dolby Atmos and DTS.+
  
-This documentation will guide you how to recored audio from eARC.+This documentation will guide you how to record audio from the HDMI eARC channel.
  
 <WRAP important > <WRAP important >
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 ===== TV side setup ===== ===== TV side setup =====
  
-In order to use the ''eARC'' functuion, you need to make sure your TV supports the ''eARC'' function, in generic, if the HDMI slot on your TV has a ''eARC'' mark,\\ +In order to use the eARC function, you need to make sure your TV is also eARC capable, It is denoted by the eARC label on the HDMI Input.
-it means your TV supports eARC function, anyway you need to check with your TV vendor whether it supports or not.+
  
-You also need to enable the ''eARC'' function on your TV if it supports, you can check with the TV vendor about how to enable it.+You can also check with the TV vendor about how to enable it.
  
 ===== VIM3L side setup ===== ===== VIM3L side setup =====
  
-You also need to enable the 'eARC' RX function on VIM3L, you can follow the command below to enable 'eARC' RX.+You also need to enable the eARC Receiver function on VIM3L, you can follow the command below to enable eARC RX.
  
 ```shell ```shell
-amixer cset name='ARC eARC RX enable' 1+$ amixer cset name='ARC eARC RX enable' 1
 ``` ```
 +
 +Check its status if it's enabled:
 +
 +```shell
 +$ amixer cget name='ARC eARC RX enable'
 +numid=41,iface=MIXER,name='ARC eARC RX enable'
 +  ; type=BOOLEAN,access=rw------,values=1
 +  : values=on
 +```
 +
 +''values=on'' means eARC RX is enabled.
 +
 +===== Hardware connection =====
 +
 +You need to use a HDMI 2.1 cable to connect VIM3L HDMI port to your TV HDMI Input with eARC function.
 +
 +===== Check eARC status =====
  
 You can follow the command below to check the status of eARC. You can follow the command below to check the status of eARC.
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 ``` ```
  
 +^ Value ^ Status ^
 +|''values=2''| Device work on eARC |
 +|''values=1''| Device work on ARC |
 +|''values=0''| ARC/eARC not connected |
 +
 +If your setup is correct, it should be ''values=2'' which means work on eARC.
 +
 +<WRAP tip >
 +You can also try to unplug/replug HDMI cable to check.
 +</WRAP>
 +
 +===== Record audio from eARC =====
 +
 +You can check the record sound devices with ''arecord -l''
 +
 +```shell
 +$ arecord -l
 +**** List of CAPTURE Hardware Devices ****
 +card 0: AMLAUGESOUND [AML-AUGESOUND], device 0: TDM-B-dummy-alsaPORT-i2s multicodec-0 []
 +  Subdevices: 1/1
 +  Subdevice #0: subdevice #0
 +card 0: AMLAUGESOUND [AML-AUGESOUND], device 1: TDM-A-dummy-alsaPORT-pcm multicodec-1 []
 +  Subdevices: 1/1
 +  Subdevice #0: subdevice #0
 +card 0: AMLAUGESOUND [AML-AUGESOUND], device 2: TDM-C-dummy dummy-2 []
 +  Subdevices: 1/1
 +  Subdevice #0: subdevice #0
 +card 0: AMLAUGESOUND [AML-AUGESOUND], device 3: PDM-dummy-alsaPORT-pdm dummy-3 []
 +  Subdevices: 1/1
 +  Subdevice #0: subdevice #0
 +card 0: AMLAUGESOUND [AML-AUGESOUND], device 4: SPDIF-dummy-alsaPORT-spdif dummy-4 []
 +  Subdevices: 1/1
 +  Subdevice #0: subdevice #0
 +card 0: AMLAUGESOUND [AML-AUGESOUND], device 6: EARC/ARC-dummy-alsaPORT-earc dummy-6 []
 +  Subdevices: 1/1
 +  Subdevice #0: subdevice #0
 +card 0: AMLAUGESOUND [AML-AUGESOUND], device 7: LOOPBACK-A-dummy-alsaPORT-loopback dummy-7 []
 +  Subdevices: 1/1
 +  Subdevice #0: subdevice #0
 +```
 +
 +The ''card 0, device 6'' device is the eARC device. You can record audio with the command below:
 +
 +```shell
 +arecord -D hw:0,6 -f S16_LE -c 2 -r 48000 /tmp/out.wav
 +```
  
  
Last modified: 2023/11/08 21:11 by nick

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