In an audio signal delay apparatus and methods, an audio signal modulated by biphase mark modulation is received and a header part of the audio signal is identified. Thereafter, a data part of the audio signal is demodulated to store the identification data and the demodulated data part in a memory, the identification data from the memory is read out to reconstruct the header part after a specified time. Subsequently, the data part is read out from the memory to modulate the data part by the biphase mark modulation and the reconstructed header part is combined with the modulated data part to output the combined data. Preferably, the identification data is represented by two bits.