你好,
我正在使用DA7212编解码器中的ALC遇到周期性问题。系统正在运行Linux,并使用DA7213 SEC驱动程序进行半系统。
问题是,有时ALC在降低收益后不会恢复。似乎这个问题是由麦克风上突然的高输入触发的,导致ALC缩短增益,但它永远不会备份增益。
ALC_ATTACK = 44 / FS
ALC_RELEASE = 176 / FS
ALC_INTEG_RELEASE = 1/4
ALC_INTEG_ATTACK = 1/4
ALC_HOLD = 62 / FS
ALC_THRESHOLD_MIN = -24 dB
ALC_THRESHOLD_MAX = -9 dB
ALC_ATTEN_MAX = 60 dB
ALC_GAIN_MAX = 60 dB
ALC_ANA_GAIN_MAX = 36 dB
ALC_ANA_GAIN_MIN = 0 dB
alc_anticlip_en被禁用了
ALC_ANTICLIP_LEVEL = 0
ALC noise level is set at -94.5 dB
任何更接近为什么发生这种情况的想法?DA7212中的任何寄存器,我可以监视以查看ALC的内部状态/操作。
Best Regards,
乌尔里希
设备:
你好ulrich,
让我看看这个。
亲切的问候,
艾略特德克斯特布
你好ulrich,
您是否能够向我提供注册转储?
亲切的问候,
艾略特德克斯特
你好,
请参阅下面的注册转储streamin期间g. Please note the ALC is behaving normally in this case.
根@ x:〜i2cdump -f -y 2 0x1a
No size specified (using byte-data access)
0 1 2 3 4 5 6 7 8 9 A B C D E F 0123456789ABCDEF
00: 00 00 00 05 00 00 07 07 00 00 00 00 00 00 00 00 ...?..??........
10:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
20: 00 10 0a 08 07 ea 1e 88 80 08 32 8b 00 00 00 00 .?????????2?....
30:35 35 02 02 0F 0F 6F 6F 88 07 07 07 00 00 00 00 00 00 5 55 ????????????????????????
40:00 88 88 08 80 6F 6F 61 39 39 30 00 00 00 00 00 00。???? OOA990 .....
50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
60: 64 64 11 08 08 28 28 20 20 60 60 68 68 68 18 18 dd???(( ``hhh??
70:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ......
80:00 21 89 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00。!?? ............
90:00 00 00 00 00 00 03 32 95 00 00 00 00 00 00 3F 10 06 AA ....?2?..... ????
A0:71 00 00 00 D0 0F 00 00 00 00 00 00 00 00 q .. ...... ?? ......
B0:00 00 00 00 00 00 00 00 00 00 55 15 00 40 02 01 00 00 00 ....... U?。@ ?? ...
C0:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ......
D0:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ......
e0:01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00?...............
F0:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 00 00 ...........?。
Best Regards,
乌尔里希
你好ulrich,
谢谢你的注册转储。我们设法在实验室中重新创建问题,我们发现了一个潜在的工作,将Alc_gain_max更改为72dB。自从改变价值以来,我们没有观察到这个问题。我们将进一步介绍为什么出现此问题。
亲切的问候,
艾略特德克斯特
你好,
感谢您的反馈意见。我将测试您的建议并报告。
Best Regards,
乌尔里希
你好,
我已经测试了建议的变化,它没有解决问题。降低收益后,ALC仍然并不总是恢复。由于信号的剪辑,还将ALC_Gain_max更改为72dB导致失真。
你能解释一下原因在ALC中的这种意外行为吗?任何其他解决问题的建议。
Best Regards,
乌尔里希
嗨艾略特,
与ALC有关的另一个观察是我看到左端右声道的幅度之间的差异很大。仅在使用ALC时才看到这一点。从数据表中读取的内容,ALC对两个频道都适用相同的增益呢?
使用固定增益,左端右声道的幅度是相等的。
Best Regards,
乌尔里希
嗨Ulrich,
Thats interesting, the work around seemed to work on the bench here. I have raised this with the team again, hopfully i can get some answers to you soon.
亲切的问候,
艾略特德克斯特
你好ulrich,
抱歉迟到的回复,我现在不在办公室。我有几个问题和建议:
将ALC_SYNC_MODE设置为已启用,假设我们已经需要ALC_ANCELLP_CTRL启用= 0xA1至0x80,并且ALC_ANTICLIP_LEVEL = 0xA2至0x64。这应该解决所观察到的问题。
亲切的问候,
艾略特德克斯特
嗨艾略特,
Replies to your questions:
1.我测试期间信号的幅度是正常的语音。然后,我点击麦克风以激发ALC的高输入。当然,增益当然被预期降低,但当我停止点击麦克风时,增益有时会保持低位。
2.见附件
3. I have not tried that yet.
What I have tried is to use the ALC without auto calibration and that seems to solve the problem. I set ALC_SYNC_MODE = 1 and ALC_OFFSET_EN = 0. What impact may that have?
To me it looks like the ALC offset calibration is not done correctly which causes the ALC to fail sometimes. I have attached my linux da7213 driver. Does anything look suspicious to you?
Best Regards,
乌尔里希
你好,
原理图附着。
Best Regards,
乌尔里希