def feature_norm_ldc(df):
    
    """
    Process the features to obtain the standard metrics in LDC mode.
    """
    
    df['HNAP'] = df['HNAC']/df['ICC_abs']*100
    df['TCC'] = (df['ICC_abs']+df['DCC_abs'])/df['VOL']
    df['ICC'] = df['ICC_abs']/df['VOL']
    df['DCC'] = df['DCC_abs']/df['VOL']
    return df