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Synchronization device for transmitting real-time voice data by USB

A synchronization device and sound data technology, applied in the direction of synchronization device, transmission system, digital transmission system, etc., can solve the problem of asynchronous data transmission between USB host and external device

Active Publication Date: 2010-03-03
HOLTEK SEMICON
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Problems solved by technology

[0008] The present invention proposes a synchronization device for USB to transmit real-time audio data, the main purpose of which is to solve the problem of asynchronous data transmission between the USB host and external devices

Method used

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  • Synchronization device for transmitting real-time voice data by USB
  • Synchronization device for transmitting real-time voice data by USB

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Embodiment Construction

[0048] In order to have a further understanding of the purpose, structure, features, and functions of the present invention, it will be described in detail below with reference to the accompanying drawings and examples, but the following drawings and examples are only for auxiliary illustrations, and the present invention is not limited to the accompanying drawings and examples.

[0049] figure 2 For the circuit block diagram of the preferred embodiment of the synchronous device for USB transmission instant voice data of the present invention, please refer to figure 2, the present invention is used for the synchronization device 9 of USB transmission real-time audio data, comprises: a first addition unit 10 (for example, a floating-point number addition unit), and it is used for receiving a plurality of frame start signals SOFP, and produces a frame Start signal total value SOFPT; a frame start countdown unit 11, after receiving the first frame start signal SOFP of the fram...

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Abstract

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 pulsesignal 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.

Description

technical field [0001] The invention relates to a synchronizing device used for USB to transmit real-time audio data, in particular to a synchronizing device which can solve the problem of asynchronous data transmission between a USB host and an external device. Background technique [0002] figure 1 It is a circuit block diagram of a known synchronous device for USB transmission of instant sound data, its reference Figure 1 , the known synchronous device 1 that is used for USB to transmit real-time voice data mainly consists of a differential addition unit 2, a frame calibration temporary storage unit 3, a calibration mapping unit 4, a calibration pulse generation unit 5, a frequency division unit 6, a frame The initial countdown unit 7 is formed and three addition units 8 are formed, wherein a first clock pulse signal CLKOUT is a clock pulse signal generated by a second clock pulse signal CLK4X through the frequency division unit 6, and a frequency division multiple sele...

Claims

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Application Information

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IPC IPC(8): H04L7/00H04M11/06
Inventor 吴旻兴林春安
Owner HOLTEK SEMICON
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