Electronic device for converting audio file format

摘要

An electronic device for converting a multi-channel audio file to a dual channel audio file and vice versa. The multichannel audio file includes a right channel group and a left channel group of channel signals. The electronic device respectively mixes the channel signals of the right channel group and the left channel group according to a mixed matrix to form N mixed signals, and cross embeds the N mixed signals to from a left channel audio signal and a right channel audio signal to compose the dual channel audio file. The electronic device samples, recombines and decodes the left channel audio signal and the right channel audio signal according to a decoding matrix, which is the inverse of the mixed matrix, to revert to the original multi-channel audio file.

主权项

1. An electronic device for converting audio file format, having a storage unit storing a multichannel audio file containing a left channel group and a right channel group both of which have N channel signals and N is at least two, and a processor to perform a method comprising steps of:
mixing left channel signals of the left channel group through a mixed matrix which is a N×N matrix to form N left mixed signals; cross embedding the N left mixed signals to form a left channel audio signal; mixing right channel signals of the right channel group through the mixed matrix to form N right mixed signals; and cross embedding the N right mixed signals to form a right channel audio signal; wherein the left channel audio signal and the right channel audio signal compose a dual channel audio file, the storage unit stores a decoding matrix which is the inverse of the mixed matrix, and the dual channel audio signal is converted to the multichannel audio file through the decoding matrix by sampling the dual channel audio signal in M sampling times, wherein a sampled data which the remainder of M/N is 1 is arranged as a first signal, a sampled data which the remainder of M/N is 2 is arranged as a second signal, and a sampled data which the remainder of M/N is 0 is arranged as a N signal.