Patent ID: 7986792

Claim:
An adaptor connectable between a signal processor and a transmission module, the signal processor having three audio channels for feeding respectively a first audio signal, a second audio signal different from the first audio signal, and a third audio signal having a frequency range lower than a frequency range of the first and second audio signals, the transmission module having two transmission channels capable of transmitting two audio signals to a codeless speaker, the adaptor comprising: three input terminals that correspond to the three audio channels of the signal processor for receiving therefrom the first audio signal, the second audio signal different from the first audio signal, and the third audio signal having the frequency range lower than the frequency range of the first and second audio signals; a filter section that filters at least one of the first and second audio signals for cutting therefrom a lower frequency range comparative to the lower frequency range of the third audio signal; an addition section that adds the third audio signal to said at least one of the first and second audio signals from which the lower frequency range is cut; and two output terminals that correspond to the two transmission channels of the transmission module, so that one of the two output terminals feeds one of the first and second audio signals added with the third audio signal to one of the two transmission channels of the transmission module, and the other of the two output terminals feeds the other of the first and second audio signals to the other of the two transmission channels of the transmission module.