Asynchronous signal input device and sampling frequency conversion device

Abstract

An asynchronous data input device in which a writing section successively writes data into a first-in-first-out (FIFO) buffer memory at a variable input rate so that the data is accumulated in the FIFO buffer memory. The read section successively reads out accumulated data from the FIFO buffer memory at a variable output rate so that the amount of data residing in the FIFO buffer memory varies with time. The detector detects the current amount of data residing in the FIFO buffer memory, and the current direction of change of the amount of data residing in the FIFO buffer memory. The loop filter generates control information according to the detected current data volume and the direction of change of the detected current data volume. The controller adjusts the output rate based on the control information so as to rapidly converge the current data amount residing in the FIFO buffer memory to the target data amount.

Description

technical field [0001] The present invention relates to an asynchronous signal input device for stably transmitting an asynchronous signal between different devices, and to a sampling frequency conversion device using the asynchronous signal input device. Background technique [0002] Digital audio equipment and the like use various sound sampling frequencies such as 32kHz, 44.1kHz, and 48kHz. There may be a case where devices with different sampling frequencies are connected to each other. If the receiving device directly reads the data string of the original signal waveform supplied from the transmitting device, the output signal waveform will be deformed in the time direction. The original waveform cannot be reproduced correctly. To solve this problem, the receiving device uses a sampling frequency conversion device. A sampling frequency conversion device receives an input data string of a first sampling frequency. Based on the input data string, the sampling frequenc...

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