Method and device for audio clock recovery

Abstract

The invention discloses an audio clock recovery method and an apparatus thereof. Firstly, a sampling rate of audio data in a link data is calculated, and then a configuration parameter of a loop frequency divider in a phase-locked loop is calculated. And the loop frequency divider is configured so as to acquire a clock whose frequency is a theory frequency of an audio clock to be recovered. According to a read-write state of a double-clock first-in first-out module, a configuration parameter of the loop frequency divider is adjusted so that a clock output by the phase-locked loop corresponding to the adjusted configuration parameter satisfies a requirement that the double-clock first-in first-out module is in a dynamic balance state. During an audio clock recovery process, a value of the loop frequency divider is only related to the sampling rate of the audio clock, and a value of a preposition frequency divider can be configured through any modes and does not depend on correlation information sent by a sending terminal, such as values of N and CTS, or Maud and Naud. Therefore, after using the audio clock recovery scheme provided in the invention, a receiving terminal can be compatible with all the sending terminals so that compatibility of the receiving terminal is increased.

Description

technical field [0001] The present application relates to the technical field of signal transmission, and more specifically, to an audio clock recovery method and device. Background technique [0002] In some high-speed signal interface protocols such as HDMI, MHL and DP protocols, audio data is packaged in the link data and transmitted through the link, and transmitted at a certain link rate, but the original audio sampling clock is not included in the link , in order to ensure the quality of audio signal playback without any data loss or error, it is necessary to regenerate the sampling clock at the receiving end. The process of generating this sampling clock is the audio clock recovery process. [0003] Existing audio clock recovery schemes all need to rely on relevant information sent by the sender, such as N and CTS in the HDMI and MHL protocols, and Maud and Naud in the DP protocol. The receiving end uses the values ​​of N and CTS, or Maud and Naud, to configure the v...

AI Technical Summary

Problems solved by technology

However, the relevant information sent by different senders in the market has different accuracy and stability, so that the same receiver may not be able or difficult to be compatible with all senders at the same time

Therefore, audio clock recovery schemes that rely on relevant information sent by the sender reduce the compatibility of the receiver

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