Synchronization device for transmitting real-time voice data by USB
The invention discloses a synchronization device for transmitting real-time voice data by a USB, which comprises a first addition unit, a frame start count-down unit, a phase locking circuit, a frequency dividing unit, a second addition unit, a third addition unit, a fourth addition unit, a frame ca...
Saved in:
Main Authors | , |
---|---|
Format | Patent |
Language | Chinese English |
Published |
02.05.2012
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | The invention discloses a synchronization device for transmitting real-time voice data by a USB, which comprises a first addition unit, a frame start count-down unit, a phase locking circuit, a frequency dividing unit, a second addition unit, a third addition unit, a fourth addition unit, a frame calibration and scratch memory unit, a fifth addition unit, a calibration and mapping unit and a calibration pulse generation unit. Therefore, a frame start identifier transmitted by a USB host computer is used as a reference cycle in 1ms, and a high-frequency clock pulse generates a first clock pulse signal through the frequency dividing unit; the pulse number of the first clock pulse signal in a USB start frame is fixed, but the absolute time can be automatically fine-tuned with the time lengthof the previous frame start; and therefore, the synchronization device can solve the problem of desynchronized data transmission between the USB host computer and an external device. |
---|---|
Bibliography: | Application Number: CN20081146786 |