How to transfer usb microphone streaming data at 44.1kHz

Hi all,

I am implementing a stereo, 16bit-res microphone application. The application should send the recorded data over USB to PC.

I succeeded to make the microphone work well at 48kHz and now I am stuck at isochronous transfer at 44.1kHz.

The isochronous transfer type is Synchronous. And the In endpoint max packet size is 192bytes.

I use the 'usblyzer' to grab the packets that I found 3 different results:

(1) When I send 176 bytes data to PC every millisecond. PC can received 1760bytes/10ms.
(2) When I send 180 bytes data to PC every millisecond. PC can received a random amount of data between 500 to 800.
(3) When I send 9 x 176 bytes and one 180 bytes every 10 millisecond. PC can received 1412bytes/10ms or 1760bytes/10ms(4x1412 and 1x1760 as a period).

So I guess I made a mistake at how to transfer the streaming data at 44.1kHz over usb to pc.

Can anybody tell me how to transfer streaming data at 44.1kHz over usb to PC?