public static ByteBuffer convertToSigned16BitSamples(Buffer buffer){
  return convertToSigned16BitSamples(buffer.getSamples());
}

public static ByteBuffer convertToSigned16BitSamples ( Buffer buffer ) { return convertToSigned16BitSamples ( buffer . getSamples ( ) ) ; }
converts the float samples in a complex buffer to a little endian 16 - bit buffer
