Receiver-compatible enhanced definition television system

A television decoder for decoding a signal in which enhancement information for display on an enhanced-definition television (EDTV) system is embedded, the video signal being compatible with a standard receiver which cannot display the enhancement information, the decoder comprising:

• a. a filter bank for dividing the video signal into at least two groups of spatial frequency components including a first group and a second group, the second group containing at least one member in which enhancement information is embedded;
• b. a quantizer for quantizing members of the second group;
• c. a combiner for generating a third group of frequency components from the quantized members and the corresponding non-quantized members of the second group, the third group including members representing the enhancement information;
• and
• d. a synthesizer for combining members of the first group, quantized members of the second group and members of the third group to generate an EDTV video signal for displaying the enhancement information on the EDTV system.

A television system for generating a transmission signal which can be displayed on a standard receiver from a production video signal containing enhancement information which cannot be displayed on the standard receiver, the system comprising:

• a. an encoder for generating a receiver-compatible signal said encoder comprising means for extracting the enhancement information from the production video signal, a quantizer for quantizing lower frequency components of the video signal, the lower frequency components being among the frequency components which are displayed on the standard receiver, and means for embedding the enhancement information into the quantized lower frequency components;
• and
• b. A modulator for generating the transmission signal from the receiver-compatible video signal;
• wherein the extraction means comprises a filter bank for dividing the video signal into at least two groups of spatial frequency components including a first group and a second group, the first group containing the lower frequency components and the second group containing the enhancement information;
• and wherein the embedding means comprises a combiner for adding selected members of the second group to corresponding members of the first group to produce a modified first group;
• and wherein the encoder further comprises a synthesizer for combining the members of the modified first group to generate the receiver-compatible video signal.

An enhanced-definition television (EDTV) receiver for decoding a transmission signal in which enhancement information for video display is embedded in quantized lower frequency components of the transmission signal, the transmission signal being compatible with a standard receiver which cannot display the enhancement information, the receiver comprising:

• a. front end circuitry for receiving and demodulating the transmission signal to generate a received signal;
• b. a decoder comprising means for extracting the embedded enhancement information from the lower frequency components of the received signal and means for generating an EDTV video signal including the extracted enhancement information;
• and
• c. a video display section for displaying the enhancement information in the EDTV video signal,
• wherein the extracting means comprises a filter bank for dividing the received signal into at least two groups of spatial frequency components including a first group and a second group, the second group containing members in which the enhancement information is embedded;
• a quantizer for quantizing members of the second group;
• and a combiner for generating a third group of frequency components from the quantized members and the corresponding non-quantized members of the second group, the third group including members containing the enhancement information;
• and wherein the generating means comprises a synthesizer for combining members of the first group, quantized members of the second group and members of the third group to generate said EDTV video signal for displaying the enhancement information on the EDTV receiver.

A method for generating a receiver-compatible signal from a production video signal, the receiver-compatible signal possessing enhancement information for display on an enhanced-definition television (EDTV) system and being compatible with a standard receiver which is not equipped to process the enhancement information, the method comprising:

• a. dividing the video signal into at least two groups of spatial frequency components including a first group and a second group, the first group containing members which when combined together form a standard video signal which is displayed by the standard receiver and the second group containing the enhancement information;
• b. quantizing members of the first group;
• c. adding selected members of the second group to corresponding quantized members of the first group to produce a modified first group;
• and
• d. combining the members of the modified first group to generate the receiver-compatible video signal.

A method for decoding a video signal in which enhancement information for display on an enhanced-definition television (EDTV) system is embedded, the video signal being compatible with a standard receiver which is not equipped to process the enhancement information, the method comprising:

• a. dividing the video signal into at least two groups of spatial frequency components including a first group and a second group, the second group containing members in which the enhancement information is embedded;
• b. quantizing members of the second group;
• c. generating a third group of frequency components by combining the quantized members with the corresponding non-quantized members of the second group, the third group including members containing the enhancement information;
• and
• d. combining members of the first group, quantized members of the second group and members of the third group to generate an EDTV video signal for displaying the enhancement information on the EDTV system.