Television broadcasting and receiving systems utilizing hybrid ghost reference signals in single field for fast ghost cancellation

An apparatus for transmitting a plurality of HDTV signals divided into a plurality of cyclic fields each including field synchronization signals and a vertical blanking period which further includes a plurality of horizontal scanning periods wherein said apparatus including a channel characterization enabling means comprising:

• a reference signal generating means for transmitting periodically within a single vertical blanking period for one of said plurality of cyclic fields at least two reference signals each with a different predefined signal characteristic wherein each of said reference signals being transmitted in a different time duration defined by said horizontal scanning periods and each of said reference signals is either a pseudo-random noise (PN) signal, a chirp signal, or a hybrid signal including a PN sequence and a chirp signal.

An apparatus for transmitting a plurality of signals divided into a plurality of cyclic fields each including field synchronization signals and a vertical blanking period which further includes a plurality of horizontal scanning periods wherein said apparatus including a channel characterization enabling means comprising:

• a reference signal generating means for transmitting periodically within a single vertical blanking period for one of said plurality of cyclic fields at least two reference signals each with a different predefined signal characteristic wherein each of said reference signals being transmitted in a different time duration defined by said horizontal scanning periods.

An apparatus for receiving a plurality of signals divided into a plurality of cyclic fields each including field synchronization signals and a vertical blanking period which further includes a plurality of horizontal scanning periods wherein at least two of said horizontal scanning periods in a single vertical blanking period including two different reference signals wherein each of said reference signals being either a pseudo-random noise (PN) signal, a chirp signal, or a hybrid signal including a PN sequence and a chirp signal, said apparatus including a channel characterization means comprising:

• a reference signal processing means for processing said received signals including said two different reference signals in said two horizontal scanning periods within said single vertical blanking period for performing a channel characterization.

An HDTV apparatus for receiving a plurality of HDTV signals divided into a plurality of cyclic fields each including field synchronization signals and a vertical blanking period which further includes a plurality of horizontal scanning periods wherein at least two of said horizontal scanning periods in a single vertical blanking period including two different reference signals wherein each of said reference signals being either a pseudo-random noise (PN) signal, a chirp signal, or a hybrid signal including a PN sequence and a chirp signal, said apparatus including a channel characterization means comprising:

• a reference signal processing means for processing said received HDTV signals including said two different reference signals in said two horizontal scanning periods within said single vertical blanking period for performing a channel characterization.