1) 并发呼叫，usb出现的error，声音质量变差。
[ 5710.890949] retire_capture_urb: 49153 callbacks suppressed
[ 5715.905053] retire_capture_urb: 48602 callbacks suppressed
[ 5720.911106] retire_capture_urb: 48114 callbacks suppressed
[ 5725.925369] retire_capture_urb: 47339 callbacks suppressed
[ 5730.938901] retire_capture_urb: 48899 callbacks suppressed
[ 5735.953064] retire_capture_urb: 47606 callbacks suppressed
[ 5740.990909] retire_capture_urb: 48711 callbacks suppressed
[ 5745.998072] retire_capture_urb: 47527 callbacks suppressed
[ 5751.006063] retire_capture_urb: 41623 callbacks suppressed
[ 5756.016467] retire_capture_urb: 34717 callbacks suppressed