Data communication method, data transmitting apparatus, data receiving apparatus, and data transmission program

A data transmitting apparatus comprising:

• a 1-bit conversion section that converts analog signals comprising voice or music or digital signals obtained by digitizing voice or music into non-return-to-zero digital signals formed by 1-bit data streams using a noise shaping method;
• a return-to-zero section that uses a high level for converted digital signals of “1” and a low level for converted digital signals of “0”, and for a high level converts the converted digital signals into return-to-zero signals having a pulse width smaller than the pulse width of non-return-to-zero signals and then outputs the return-to-zero signals, and for a low level outputs the converted digital signals as they are at a low level, and
• a radio transmitting section that outputs the return-to-zero digital signals as radio signals.

A data transmitting program comprising:

• a zero insertion function in which a number p (wherein p is a natural number) of data representing “0” are inserted for each bit in a 1-bit data stream obtained by performing noise shaping processing on analog signals comprising voice or music or digital signals obtained by digitizing voice or music;
• and
• a transmitting function in which, by sending 1-bit data streams in which the “0” data have been inserted at a speed of (p+1) times a noise shaping frequency used by the noise shaping processing to a radio transmitting section, return-to-zero digital signals are transmitted in which the pulse width at high level is {100/(p+1)}% the pulse width at high level of non-return-to-zero signals.