Digital audio loudness measuring card

Abstract

Disclosed is a digital audio loudness measuring card. The digital audio loudness measuring card is a measuring board card installed on the PCI express of a computer and comprises a digital audio collecting unit, a decoding unit, a loudness calculating unit and a communication unit, wherein the board card collects a digital audio signal directly and calculates the corresponding loudness of the audio signal, the loudness calculating unit comprises three sub-units, namely a filtering calculation unit, an integral average calculation unit and a weighting calculation unit, connected in sequence to obtain a loudness data result, the loudness data result of the loudness calculating unit is connected to the computer by the communication unit and then is recorded, displayed, stored and analyzed by the computer, the digital audio collecting unit comprises as many as three sets of input interfaces, each set of interfaces comprises three kinds of digital audio input interface circuits adapted to AES / EBU or S / PDIF signals, the three kinds of input interface circuits are used for receiving the AES / EBU signals or the S / PDIF signals input in a balanced mode or in an unbalanced mode, and selection of each set of digital audio input interface circuits is achieved through a multi-path selector switch.

Description

technical field [0001] The invention is a digital audio frequency loudness measurement card using a PCI express interface. The card can collect multiple channels of AES / EBU or S / PDIF digital audio signals, then calculate the loudness of these signals, record, display, store and analyze through the computer. It can be widely used in the production and broadcasting fields of audio and video programs such as radio and television. Background technique [0002] PCI express (PCI-e for short) adopts the popular point-to-point serial connection. Compared with the shared parallel architecture of PCI and earlier computer buses, each device has its own dedicated connection and does not need to request bandwidth from the entire bus, and The data transfer rate can be increased to a very high frequency, achieving high bandwidth that PCI cannot provide. Compared with the traditional PCI bus that can only achieve one-way transmission in a single time period, the dual-simplex connection of...

AI Technical Summary

Problems solved by technology

But this kind of product also has a big weakness, the measurement and calculation process of the loudness is completely completed by the CPU of the computer, when the loudness meter exists as a plug-in of the program production software, it takes up a lot of system resources

When the loudness software runs independently, it will also monopolize the sound card resources, so that other software cannot operate the sound card at the same time, and cannot perform normal program production at the same time

In addition, the loudness software running in the form of a plug-in is limited by the version of the audio and video program production software, has poor versatility, and cannot directly calculate the real-time loudness of the audio signal input to the sound card

Images