A right expected value generator generates an expected value of a right channel spectrum from the right channel spectrum. Further, a left expected value generator generates an expected value of a left channel spectrum from the left channel spectrum. Further, a right channel spectrum corrector so corrects a right channel spectrum outputted from a second synthesizer that the right channel spectrum does not exceed the expected value of the right channel spectrum. Moreover, a left channel spectrum corrector so corrects a left channel spectrum outputted from the second synthesizer that the left channel spectrum does not exceed the expected value of the left channel spectrum.

A right expected value generator generates an expected value of a right channel spectrum from the right channel spectrum. Further, a left expected value generator generates an expected value of a left channel spectrum from the left channel spectrum. Further, a right channel spectrum corrector so corrects a right channel spectrum outputted from a second synthesizer that the right channel spectrum does not exceed the expected value of the right channel spectrum. Moreover, a left channel spectrum corrector so corrects a left channel spectrum outputted from the second synthesizer that the left channel spectrum does not exceed the expected value of the left channel spectrum.

A radio apparatus for a vehicle and a control method thereof. An aspect of the present disclosure provides a method of controlling a vehicle radio apparatus, the method comprising: checking a program title of a program of Internet radio being listened to; searching for a frequency of a first analog radio with the program title, the first analog radio being a radio broadcast transmitted by a radio station; checking an electric field strength of the first analog radio at the frequency; modulating the Internet radio to a second analog radio when the electric field strength is less than a threshold; and transmitting the second analog radio.

A radio apparatus for a vehicle and a control method thereof. An aspect of the present disclosure provides a method of controlling a vehicle radio apparatus, the method comprising: checking a program title of a program of Internet radio being listened to; searching for a frequency of a first analog radio with the program title, the first analog radio being a radio broadcast transmitted by a radio station; checking an electric field strength of the first analog radio at the frequency; modulating the Internet radio to a second analog radio when the electric field strength is less than a threshold; and transmitting the second analog radio.

An audio application determines a left magnitude of the audio source (LS.sub.k) and a right magnitude of the audio source (RS.sub.k). The audio application determines an amplitude difference (D.sub.k). The audio application calculates a temporal derivative d(D.sub.k) of the D.sub.k. The audio application determines an average of LS.sub.k and RS.sub.k to obtain a mid-channel spectrogram (MCS.sub.k). The audio application normalizes the MCS.sub.k to obtain a normalized value (R.sub.k). The audio application divides d(D.sub.K) by R.sub.k to obtain a confidence map. The audio application computes a blending weight by scaling and clipping the confidence map. The audio application combines the MCS.sub.k, the blending weight, and the L.sub.t to obtain a left modified channel, and combining the MCS.sub.k, the blending weight, and the R.sub.t to obtain a right modified channel.