public String sample_frequency_string()
	{
		switch (h_sample_frequency)
		{
	    case THIRTYTWO:
	  	if (h_version == MPEG1)
	  		return "32 kHz";
	  	else if (h_version == MPEG2_LSF)
	    	return "16 kHz";
	    else	// SZD
	    	return "8 kHz";
	    case FOURTYFOUR_POINT_ONE:
	  	if (h_version == MPEG1)
	  		return "44.1 kHz";
	  	else if (h_version == MPEG2_LSF)
	    	return "22.05 kHz";
		else	// SZD
	    	return "11.025 kHz";
	    case FOURTYEIGHT:
	  	if (h_version == MPEG1)
	  		return "48 kHz";
	  	else if (h_version == MPEG2_LSF)
	    	return "24 kHz";
		else	// SZD
			return "12 kHz";
	  }
	  return(null);
	}