Restoring Corrupted Audio Signals
OwnerHan Lininventor
Life of this patent
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Abstract
A method of restoring a corrupted audio signal comprises the steps of; inputting the corrupted audio signal in a first channel (30-32), inputting one or more further correlated audio signals in one or more further channels (33-35), and restoring the corrupted audio signal (36) using a Multi-Channel Autoregressive (AR) Model that models the corrupted signal as a linear combination of scaled time shifted portions of the further signal (s) and the corrupted signal. Embodiments are described in which the method is used to improve received audio signals in DAB receivers and mobile telephones.
Claims21
A method of restoring a corrupted audio signal comprising the steps of;
- inputting the corrupted audio signal in a first channel,
- inputting one or more further correlated audio signals in one or more further channels, and
- restoring the corrupted audio signal using a Multi-Channel AR Model that models the corrupted signal as a linear combination of scaled time shifted portions of the further signal(s) and the corrupted signal.
A method of reproducing a DAB audio signal comprising the steps of;
- receiving and decoding a DAB signal to produce corresponding audio packets,
- receiving an analogue broadcast signal broadcast simultaneously with the DAB signal and containing the same broadcast programme,
- demodulating the analogue signal to produce an analogue audio signal therefrom,
- converting the analogue audio signal to a digitised analogue audio signal,
- entering DAB audio packets and digitised analogue audio packets into respective buffer stores to provide appropriate delays compensating time differences between the DAB and digitised analogue audio packets,
- detecting corrupted or absent DAB packets, and
- restoring the corrupted DAB packets using a Multi-Channel AR Model of the DAB and digitised analogue audio channels to interpolate missing or corrupted DAB packets.
A radio receiver comprising a DAB decoder, an analogue broadcast receiver including a demodulator for producing an analogue audio signal, a first buffer store storing a succession of decoded DAB audio packets, an analogue to digital converter for digitising the analogue audio signal, a second buffer store for storing a succession of digitised signal samples, a packet detector for determining whether DAB packets are missing, corrupted, or uncorrupted and for producing a packet loss indicator dependent thereon, and a digital signal processor having inputs for receiving DAB packets, digitised analogue audio, and the packet loss indicator;
- wherein the digital signal processor is arranged to implement a Multi-Channel AR Model so as to enable interpolation of the corrupted DAB packets using data derived from the DAB packets and the digitised analogue audio.
A telephone including a signal processor for receiving a plurality of audio signals, said signal processor being arranged to implement a Multi-Channel AR Model so as to enable interpolation of corrupted audio signals.
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Dependencies are inferred from the claim text.