TW201705010A - Apparatus and method of USB audio transmission adjustment - Google Patents

Abstract

According to one embodiment, a universal serial bus (USB) audio transmission adjustment apparatus, the apparatus comprising: a buffer processor, receives and stores an audio data transfer via a universal serial bus, and counts the audio data to generate an audio data amount; a controller, transmits a feedback information via the interrupt endpoint according to the audio data amount; and a transmission regulator receives the feedback information to decide whether to adjust the transmission speed of the audio data.

Description

Universal sequence bus (USB) audio transmission adjustment device and method

The present disclosure relates to an apparatus and method for adjusting a universal serial bus audio transmission.

In the past, analog audio playback was often applied to radios, analog TVs, etc., and the speakers were directly driven by analog signals. With the advancement of 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, homes, automobiles and other audio, as well as digital televisions, various types of computers, walkmans, Mobile phones, etc. Among them, the function of audio signal driving must have low noise and high quality, which makes the sound effect more perfect.

Analog audio playback is often used in radios, analog TVs, etc., to directly drive speakers with analog signals. The transmission of existing digital audio data has extensively used the interface of the Universal Serial Bus (USB). For example, in general, the digital audio data is transmitted from the host terminal of the universal serial bus to the universal serial device. Or use a handheld device to transfer digital audio data to the Accessory via the interface of the universal serial bus. For instant audio data transmission and Playback, often due to the difference between the clock at the accessory end and the clock of the handheld device, the audio data is corrupted, causing pauses or distortions in playback. In this case, the accessory end can adjust the transmission of the audio data by transmitting the feedback information to the handheld device via an Isochronous Endpoint.

In some cases, the handheld operating system or the embedded operating system (Linux) operating system cannot support the Asynchronous Mode, that is, the function of returning feedback information via the Isochronous Endpoint.

The present disclosure proposes a technique for adjusting the general-purpose serial bus audio transmission, and the accessory end transmits the feedback information to the handheld device via the Interrupt Endpoint, thereby adjusting the transmission of the audio data.

Embodiments of the present disclosure can provide apparatus and methods for universal serial bus (USB) audio transmission adjustment.

One disclosed embodiment relates to a universal serial bus (USB) audio transmission adjustment apparatus, the apparatus comprising: a buffer processor that receives and stores an audio data transmitted via a universal serial bus, and counts the audio The data is used to generate an amount of audio data; a controller transmits a feedback information according to the amount of the audio data via an Interrupt Endpoint; and a transmission adjuster receives the feedback information to determine whether to adjust the transmission speed of the audio data.

Another embodiment disclosed is directed to a method for universal serial bus (USB) audio transmission adjustment, the method comprising: receiving and storing an audio data transmitted via a universal serial bus using a buffer processor, and counting The audio data is used to generate an amount of audio data; using a controller, according to the amount of audio data A feedback information is transmitted by an Interrupt Endpoint; and a transmission adjuster is used to receive feedback information to determine whether to adjust the transmission speed of the audio data.

100‧‧‧General sequence bus audio transmission adjustment device

110‧‧‧ buffer processor

111‧‧‧ Audio Information

112‧‧‧Audio data volume

120‧‧‧ Controller

121‧‧‧Reward information

130‧‧‧Transfer adjuster

410‧‧‧ Using a buffer processor to receive and store an audio data transmitted via a universal serial bus, and counting the audio data to generate an audio data amount

420‧‧‧ Use a controller to transmit a feedback message via the interrupt end based on 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

1 is a schematic diagram consistent with an embodiment of the disclosure, illustrating a device for universal sequence bus audio transmission adjustment.

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

FIG. 3 is a schematic diagram consistent with an embodiment of the disclosure, illustrating that the controller transmits a feedback information according to the amount of audio data.

4 is a schematic diagram consistent with an embodiment of the disclosure, illustrating a method of universal serial bus (USB) audio transmission adjustment.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings, which are readily understood by those skilled in the art. The authoring of the invention may take a variety of variations, and should not be limited to only those embodiments. The description of the well-known part is omitted in the present invention, and the same reference numerals denote the same elements in the present invention.

The disclosure proposes a technique for adjusting the transmission of the universal sequence bus audio and audio transmission, and the accessory end transmits the feedback information to the handheld device via the Interrupt Endpoint, thereby adjusting the transmission of the audio data. 1 is a schematic diagram consistent with an embodiment of the disclosure, illustrating a device for universal sequence bus audio transmission adjustment.

In Figure 1, this universal serial bus (USB) audio transmission is adjusted. The device 100 includes: a buffer processor 110 that receives and stores an audio data 111 transmitted via a universal serial bus, and counts the audio data to generate an audio data amount 112; a controller 120 according to the audio data amount 112 A feedback information 121 is transmitted via an Interrupt Endpoint; and a transmission adjuster 130 receives the feedback information 121 to determine whether to adjust the transmission speed of the audio material 111.

According to an embodiment of the apparatus for universal sequence bus (USB) audio transmission adjustment in FIG. 1, buffer processor 110 is first provided to receive and store an audio material 111 transmitted via a universal sequence bus. 2 is a schematic diagram consistent with an embodiment of the disclosure, illustrating the buffer processor 110 of FIG. Referring to Figure 2, an audio material 111 is transmitted by a universal serial sink 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, for receiving the audio data 111 transmitted via the universal serial bus in a sequential manner. The buffer processor 110 further includes a counter 220 for counting the capacity of the audio data buffered in the buffer memory 210 to generate the audio data amount 112, as shown in FIG.

According to an implementation example of the apparatus for universal sequence bus (USB) audio transmission adjustment in FIG. 1, the controller 120 transmits a feedback information 121 via an interrupt end point according to the amount of audio data 112. FIG. 3 is a schematic diagram consistent with an embodiment of the disclosure, illustrating that the controller transmits a feedback information according to the amount of audio data. Referring to the embodiment of FIG. 3, the controller 120 can compare the amount of audio data B with an upper limit amount U and a lower limit amount L to define a feedback information 121. The upper limit amount U and the lower limit amount L are the upper limit amount U and the lower limit amount L of the buffer reservoir 210, for example, it is assumed that the capacity of the buffer storage 210 is 4 Mb (million bits), and the upper limit amount U is set to be 3 Mb and the lower limit amount. L is 1 Mb. The comparison method may use, for example, a comparator to compare the amount of data B with the upper limit amount U and the lower limit amount L. If B ≧ U, the customized feedback information 121 is set to a low frequency. If B ≦L, the feedback information 121 is set to a high frequency. If U>B>L, the feedback information 121 is set to the normal frequency. If the above data is higher than the upper limit of the buffer memory capacity, the amount of audio data in the buffer memory is high. If B≦L above, it indicates 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 low.

According to an implementation example of the apparatus for universal sequence bus (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 material 111. In the 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 is increased. speed. In the embodiment, if the feedback information 121 received by the transmission adjuster 130 is a low frequency, indicating that the amount of audio data in the buffer memory is too high, the transmission speed of the audio data 111 can be adjusted to a lower frequency, that is, the transmission is lowered. speed. In the 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 amount U and the lower limit amount L, the transmission speed of the audio data 111 may not be adjusted. .

According to another embodiment, FIG. 4 illustrates a method for universal serial bus (USB) audio transmission adjustment, the method comprising: receiving and storing an audio data transmitted via a universal sequence bus using a buffer processor, and counting The audio data is used to generate an audio data amount (step 410); using a controller to transmit a feedback information via an interrupt end point according to the amount of the audio data (step 420); and receiving a feedback information by using a transmission adjuster It is determined whether to adjust the transmission speed of the audio material (step 430).

As previously mentioned, the audio material in step 410 is a sampled audio signal material. The buffer processor can use a buffer memory such as a first in first out (First In First out (FIFO) memory that sequentially receives audio data transmitted via the universal serial bus receiving interface. The buffer processor can also use a counter to count the capacity of the audio data buffered in the buffer memory to generate the amount of audio data B.

As previously mentioned, in step 420, the controller transmits a feedback message based on the amount of audio data. The controller can compare the amount of audio data B with an upper limit amount U and a lower limit amount L to set a feedback information. The upper limit amount U and the lower limit amount L are the upper limit amount U and the lower limit amount L of the buffer storage, for example, assuming that the capacity of the buffer storage is 4 Mb (million bits), and the predetermined upper limit amount U is 3 Mb and the lower limit amount L is 1Mb. If B≦L, the feedback information is set to a high frequency. If U>B>L, the feedback information is set to the normal frequency. If B≧U, the fixed feedback information is set to a low frequency. If B≦L above, it indicates 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 low. If the above data is higher than the upper limit of the buffer memory capacity, the amount of audio data in the buffer memory is high.

As previously mentioned, in step 430, the transmission adjuster receives the feedback information to determine whether to adjust the transmission speed of the audio material. In the 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 may be adjusted to a higher frequency, that is, the transmission speed is increased. In the 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 too high, the transmission speed of the audio data may be adjusted to a lower frequency, that is, the transmission speed is lowered. In the embodiment, if the feedback information 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 amount U and the lower limit amount L, the transmission speed of the audio data may not be adjusted.

In summary, the present disclosure proposes a technique for adjusting audio transmission, which returns feedback information via an Interrupt Endpoint to adjust the transmission of audio data.

The illustrations and descriptions of the present invention are merely preferred embodiments of the present invention, and are not intended to limit the implementation of the present invention, and those who are familiar with the art are subject to the changes in the spirit of the present invention. Or the modifications should be covered by the following patent application in this case.

100‧‧‧General sequence bus audio transmission adjustment device

110‧‧‧ buffer processor

111‧‧‧ Audio Information

112‧‧‧Audio data volume

120‧‧‧ Controller

121‧‧‧Reward information

130‧‧‧Transfer adjuster

Claims (10)

A universal serial bus (USB) audio transmission adjustment device, the device comprising: a buffer processor for receiving and storing an audio data transmitted via a universal serial bus, and counting the audio data to generate an audio data amount; A controller transmits a feedback information according to the amount of the audio data via an Interrupt Endpoint; and a transmission adjuster receives the feedback information to determine whether to adjust the transmission speed of the audio data. The device of claim 1, wherein the buffer processor comprises a buffer memory to receive the audio data in a sequence. The device of claim 1, wherein the buffer processor comprises a counter to count the audio data to generate the amount of the audio data. The device of claim 1, wherein the controller compares the amount of audio data with an upper limit amount and a lower limit amount to determine the feedback information. The device of claim 4, wherein if the transmission adjuster indicates that the amount of the 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 is based on The feedback information indicates that the amount of the audio data is higher than the upper limit, and the transmission speed of the audio data is lowered. A method for universal serial bus (USB) audio transmission adjustment, the method comprising: receiving and storing an audio data transmitted via a universal sequence bus using a buffer processor, and counting the audio data to generate an audio data amount Using a controller to transmit a feedback message via an interrupt endpoint according to the amount of the audio data; A transmission adjuster is used to receive the feedback information to determine whether to adjust the transmission speed of the audio data. The method of claim 6, wherein the buffer processor uses a buffer memory to receive the audio material in a serial manner. The method of claim 6, wherein the buffer processor uses a counter to count the audio data to generate the amount of audio data. The method of claim 6, wherein the controller compares the amount of audio data with an upper limit amount and a lower limit amount to determine the feedback information. The method of claim 9, wherein if the transmission adjuster indicates that the amount of the 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 is based on The feedback information indicates that the amount of the audio data is higher than the upper limit, and the transmission speed of the audio data is lowered.