CN106407149A - Device and method for adjusting audio transmission of universal sequence bus - Google Patents

Abstract

The embodiment of the present invention discloses a device for adjusting audio transmission of a universal serial bus (USB), the device comprising: a buffer processor, receiving and storing audio data transmitted via a universal serial bus, and counting the audio data to generate an audio data volume; using a controller, transmitting a feedback information via an interrupt endpoint according to the audio data volume; and a transmission adjuster, receiving the feedback information to determine whether to adjust the transmission speed of the audio data. The technical solution of this embodiment adjusts the transmission of the audio data by returning the feedback information via the interrupt endpoint.

Description

Device and method for universal serial bus audio transmission adjustment

technical field

The invention relates to a device and a method for adjusting universal serial bus audio transmission.

Background technique

In the past, analog audio playback was often used in radios, analog TVs, etc., and the speakers were directly driven by analog signals. With the advancement of science and technology, the evolution of personal computers and networks, and the development of digital audio signal processing, digital audio playback has been applied to various electronic systems such as cinemas, home, car and other audio systems, as well as digital TVs, various types of computers, and walkmans. , mobile phone, etc. Among them, the function driven by the audio signal must have the characteristics of low noise and high quality, so that the sound effect is more perfect.

Analog audio playback is often used in radios, analog TVs, etc., and the speakers are directly driven by analog signals. The existing digital audio data transmission has widely used the interface of Universal Serial Bus (USB). For example, generally, the USB host (Host) transmits the digital audio data to the USB device (Device). Or use the handheld device to transmit the digital audio data to the accessory (Accessory) via the USB interface. For real-time audio data transmission and playback, the audio data is often damaged due to the difference between the clock of the accessory end and the clock of the handheld device, resulting in playback pause or distortion. In this case, the accessory end can send feedback information back to the handheld device via an isochronous endpoint (Isochronous Endpoint) to adjust the transmission of audio data.

In the above situation, some handheld devices or embedded system (Embedded System) Linux operating systems cannot normally support the asynchronous mechanism (Asynchronous Mode), that is, the function of returning feedback information through the isochronous endpoint (Isochronous Endpoint).

The present invention proposes a universal serial bus audio transmission adjustment technology. The accessory end sends feedback information back to the handheld device through an Interrupt Endpoint, and then adjusts the transmission of audio data.

Contents of the invention

Embodiments of the present invention can provide an apparatus and method related to Universal Serial Bus (USB) audio transmission adjustment.

A disclosed embodiment relates to a device for adjusting universal serial bus (USB) audio transmission, the device includes: a buffer processor, receiving and storing an audio data transmitted via a USB, and counting the audio data to generate an amount of audio data; a controller, which transmits feedback information through an Interrupt Endpoint according to the amount of audio data; and a transmission adjuster, which receives the feedback information to determine whether to adjust the transmission speed of the audio data.

In one embodiment, the buffer processor includes a buffer memory that receives the audio data in a sequential manner.

In one embodiment, the buffer processor includes a counter, and the counter counts the audio data to generate the audio data amount.

In one embodiment, the controller compares the amount of audio data with an upper limit and a lower limit to determine the feedback information.

In one embodiment, if the transmission adjuster indicates that the amount of audio data is lower than the lower limit according to the feedback information, the transmission speed of the audio data is increased; if the transmission adjuster indicates that the audio data is If the amount is higher than the upper limit, then the transmission speed of the audio data is lowered.

Another disclosed embodiment relates to a method for USB audio transmission adjustment. The method includes: using a buffer processor, receiving and storing an audio data transmitted via a USB, and counting the audio data to generate an audio data volume; use a controller to transmit a feedback information through the interrupt terminal (Interrupt Endpoint) according to the audio data volume; and use a transmission regulator to receive the feedback information to determine whether to adjust the transmission of the audio data speed.

In one embodiment, the buffer processor receives the audio data sequentially using a buffer memory.

In one embodiment, the buffer processor uses a counter to count the audio data to generate the audio data volume.

In one embodiment, the controller compares the amount of audio data with an upper limit and a lower limit to determine the feedback information.

In one embodiment, if the transmission adjuster indicates that the amount of audio data is lower than the lower limit according to the feedback information, the transmission speed of the audio data is increased; if the transmission adjuster indicates that the audio data is If the amount is higher than the upper limit, then the transmission speed of the audio data is lowered.

Description of drawings

FIG. 1 is a schematic diagram consistent with a disclosed embodiment, illustrating a device for adjusting USB audio transmission.

FIG. 2 is a schematic diagram illustrating the buffer processor of FIG. 1, consistent with a disclosed embodiment.

FIG. 3 is a schematic diagram consistent with a disclosed embodiment, illustrating that the controller sends a feedback message according to the amount of audio data.

FIG. 4 is a schematic diagram illustrating a method for universal serial bus (USB) audio transmission regulation consistent with a disclosed embodiment.

Wherein, the reference signs are explained as follows:

100 Universal Serial Bus audio transmission adjustment device

110 buffer processor

111 audio data

112 Audio data volume

120 controller

121 Feedback information

130 transmission regulator

410 Using a buffer processor, receiving and storing an audio data transmitted via a USB, and counting the audio data to generate an audio data amount

420 Use a controller to send a feedback message through the interrupt terminal according to the amount of audio data

430 Use a transmission adjuster to receive feedback information to determine whether to adjust the transmission speed of the audio data

detailed description

Hereinafter, embodiments according to the present invention will be described in detail with reference to accompanying drawings, so that those skilled in the art can easily understand. The described inventions can be implemented in many different ways, but should not be limited to these examples. The present invention omits the description of the well-known parts of those skilled in the art, and the same reference numerals represent the same elements in the present invention.

The present invention proposes a USB audio transmission adjustment technology. The accessory end sends feedback information back to the handheld device through an Interrupt Endpoint, and then adjusts the audio data transmission. FIG. 1 is a schematic diagram consistent with a disclosed embodiment, illustrating a device for adjusting USB audio transmission.

In Fig. 1, the device 100 for adjusting audio transmission of the Universal Serial Bus (USB) includes: a buffer processor 110, which receives and stores an audio data 111 transmitted via a USB, and counts the audio data to generate an audio Data amount 112; a controller 120, transmits a feedback information 121 through the interrupt terminal (Interrupt Endpoint) according to the audio data amount 112; and a transmission regulator 130, receives the feedback information 121 to determine whether to adjust the transmission speed of the audio data 111 .

According to the implementation example of the device for adjusting USB audio transmission in FIG. 1 , firstly, the buffer processor 110 receives and stores an audio data 111 transmitted via a USB. FIG. 2 is a schematic diagram illustrating the buffer processor 110 of FIG. 1 , consistent with a disclosed embodiment. Referring to FIG. 2, an audio data 111 is transmitted by a USB host. The audio data is a sampled audio signal data. The buffer processor 110 includes a buffer memory 210 , such as a first-in-first-out (FIFO) memory, which receives the audio data 111 transmitted through the Universal Serial Bus in a serial manner. The buffer processor 110 further includes a counter 220 for counting the volume of audio data buffered in the buffer memory 210 to generate an audio data volume 112, as shown in FIG. 2 .

According to the implementation example of the device for USB audio transmission adjustment in FIG. 1 , the controller 120 transmits a feedback message 121 through an interrupt endpoint (Interrupt Endpoint) according to the audio data volume 112 . FIG. 3 is a schematic diagram consistent with a disclosed embodiment, illustrating that the controller sends a feedback message according to the amount of audio data. Referring to the example of FIG. 3 , the controller 120 can compare the audio data volume B with an upper limit U and a lower limit L to determine a feedback information 121 . Wherein the upper limit U and the lower limit L are the upper limit U and the lower limit L of the buffer storage 210, such as assuming that the capacity of the buffer storage 210 is 4Mb (million bits), and the upper limit U is determined to be 3Mb and the lower limit L 1Mb. The comparison method can use, for example, a comparator to compare the data amount B with the upper limit U and the lower limit L. If B≧U, it is determined that the feedback information 121 is low frequency. If B≦L, it is determined that the feedback information 121 is a high frequency. If U>B>L, it is determined that the feedback information 121 is a normal frequency. If B≧U above, the amount of audio data is higher than the upper limit of the buffer memory capacity, and the amount of audio data in the buffer memory is relatively high. If B≦L above, it means that the amount of audio data is lower than the lower limit of the buffer memory capacity, and the amount of audio data in the buffer memory is relatively low.

According to the implementation example of the apparatus for USB audio transmission adjustment in FIG. 1 , the transmission adjuster 130 receives the feedback information 121 to determine whether to adjust the transmission speed of the audio data 111 . In an example embodiment, if the feedback information 121 received by the transmission adjuster 130 is a high frequency, indicating that the amount of audio data in the buffer memory is low, the transmission speed of the audio data 111 can be adjusted to a higher frequency, that is, the transmission speed can be increased. speed. In an example embodiment, if the feedback information 121 received by the transmission adjuster 130 is low frequency, indicating that the amount of audio data in the buffer memory is relatively high, the transmission speed of the audio data 111 can be adjusted to a lower frequency, that is, the transmission speed can be reduced. speed. In an example embodiment, if the feedback information 121 received by the transmission adjuster 130 is a normal frequency, indicating that the amount of audio data in the buffer memory is between the upper limit U and the lower limit L, then the transmission speed of the audio data 111 may not be adjusted. .

According to another implementation example, FIG. 4 illustrates a method for adjusting Universal Serial Bus (USB) audio transmission, the method includes: using a buffer processor, receiving and storing an audio data transmitted via a USB, and counting the audio data to generate an audio data volume (step 410); use a controller to transmit a feedback information (step 420) through the interrupt terminal (Interrupt Endpoint) according to the audio data volume; and use a transmission regulator to receive the feedback information to Determine whether to adjust the transmission speed of the audio data (step 430).

As mentioned before, the audio data in step 410 is a sampled audio signal data. The buffer processor can use a buffer storage such as a first-in-first-out (FIFO) storage to sequentially receive the audio data transmitted through the USB receiving interface. The buffer processor can also use a counter to count the volume of audio data buffered in the buffer memory to generate the audio data volume B.

As mentioned above, in step 420, the controller sends a feedback message according to the amount of audio data. The controller can compare the audio data volume B with an upper limit U and a lower limit L to determine a feedback message. Wherein the upper limit U and the lower limit L are the upper limit U and the lower limit L of the buffer storage, for example, assuming that the capacity of the buffer storage is 4Mb (million bits), and the upper limit U is determined to be 3Mb and the lower limit L is 1Mb . If B≦L, it is determined that the feedback information is high frequency. If U>B>L, it is determined that the feedback information is a normal frequency. If B≧U, it is determined that the feedback information is low frequency. If B≦L above, it means that the amount of audio data is lower than the lower limit of the buffer memory capacity, and the amount of audio data in the buffer memory is relatively low. If B≧U above, the amount of audio data is higher than the upper limit of the buffer memory capacity, and the amount of audio data in the buffer memory is relatively high.

As mentioned above, in step 430, the transmission adjuster receives the feedback information to determine whether to adjust the transmission speed of the audio data. In an example embodiment, if the feedback information received by the transmission adjuster is high frequency, indicating that the amount of audio data in the buffer memory is low, the transmission speed of the audio data can be adjusted to a higher frequency, that is, the transmission speed can be increased. In an example embodiment, if the feedback information received by the transmission adjuster is low frequency, indicating that the amount of audio data in the buffer memory is relatively high, the transmission speed of the audio data can be adjusted to a lower frequency, that is, the transmission speed can be lowered. In an exemplary embodiment, if the feedback information received by the transmission adjuster 130 is a normal frequency, indicating that the audio data volume in the buffer memory is between the upper limit U and the lower limit L, the transmission speed of the audio data may not be adjusted.

To sum up, the present invention proposes an audio transmission adjustment technology, which transmits feedback information through an interrupt endpoint (Interrupt Endpoint), and then adjusts the transmission of audio data.

The drawings and descriptions disclosed above are only preferred embodiments of the present invention, and are not intended to limit the implementation of the present invention. Any changes or modifications made by those of ordinary skill in the art according to the spirit of the present invention, All should be covered within the scope of the claims of the present invention.

Claims (10)

1. A device for adjusting universal serial bus audio transmission, the device comprising: A buffer processor receives and stores an audio data transmitted via a universal serial bus, and counts the audio data to generate an audio data amount; a controller that transmits a feedback message via the interrupt terminal according to the audio data volume; and A transmission adjuster receives the feedback information to determine whether to adjust the transmission speed of the audio data. 2. The device of claim 1, wherein the buffer processor comprises a buffer memory, and the buffer memory receives the audio data in a sequential manner. 3. The device as claimed in claim 1, wherein the buffer processor comprises a counter, and the counter counts the audio data to generate the audio data amount. 4. The apparatus of claim 1, wherein the controller compares the volume of audio data with an upper limit and a lower limit to determine the feedback information. 5. The device according to claim 4, wherein if the transmission adjuster indicates that the amount of audio data is lower than the lower limit according to the feedback information, then the transmission speed of the audio data is increased; if the transmission adjustment If the device indicates that the amount of audio data is higher than the upper limit according to the feedback information, the transmission speed of the audio data is lowered. 6. A method for universal serial bus (USB) audio transmission adjustment, comprising: using a buffer processor, receiving and storing an audio data transmitted via a universal serial bus, and counting the audio data to generate an audio data volume; using a controller to transmit a feedback message via the interrupt terminal according to the audio data volume; and A transmission regulator is used to receive the feedback information to determine whether to adjust the transmission speed of the audio data. 7. The method of claim 6, wherein the buffer processor uses a buffer memory to receive the audio data in a sequential manner. 8. The method of claim 6, wherein the buffer processor uses a counter to count the audio data to generate the audio data volume. 9. The method of claim 6, wherein the controller compares the volume of the audio data with an upper limit and a lower limit to determine the feedback information. 10. The method according to claim 9, wherein if the transmission adjuster indicates that the amount of audio data is lower than the lower limit according to the feedback information, then the transmission speed of the audio data is increased; if the transmission adjustment If the device indicates that the amount of audio data is higher than the upper limit according to the feedback information, the transmission speed of the audio data is lowered.