2014 Japanese Study: Data Hiding Scheme for Amplitude Modulation Radio Broadcasting Systems

ResearchGate: https://www.researchgate.net/figure/Waveform-and-spectrum-of-signals-in-DSB-WC-method-a-message-signal-b-modulated_fig1_272420755

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Abstract. This paper proposes a data hiding scheme for amplitude-modulation (AM)

radio broadcasting systems. The method of digital audio watermarking based on cochlear

delay (CD) that we previously proposed is employed in this scheme to construct a datahiding scheme in the AM domain. We investigate the feasibility of applying the method

of CD-based inaudible watermarking to send inaudible additional messages in AM signals. The proposed scheme modulates a carrier signal with both original and watermarked

signals as lower and upper sidebands by using the novel double-modulation and then transmits the modulated signal to the receivers. Particular receivers in the proposed scheme

demodulate the received signals to get both original and watermarked signals by using

the double-demodulation and then extract messages from the watermarked signal and the

original signal using CD-based watermarking. The results we obtained from computer

simulations revealed that the proposed scheme can transmit messages as watermarks in

AM signals and then correctly extract the messages from observed AM signals. The results also indicated that the sound quality of the demodulated signals could be kept high

not only with the proposed scheme but also in traditional AM radio systems. This means

that the proposed scheme has the possibility of acting as a hidden-message transmitter

as well as having low-level compatibility with AM radio systems. The proposed scheme

could be applied in emergency alert systems and high utility AM radio services.

Keywords: data hiding, cochlear delay, amplitude modulation, emergency communications.