Apparatus for sampling and displaying an auxiliary image with a main image

Apparatus for displaying a combined image of an auxiliary image and a main image, comprising:

• a source of a main image signal;
• a source of samples representing an auxiliary image signal;
• a quincunx subsampler, coupled to the auxiliary image sample source, for compressing said auxiliary signal by vertical filtering and horizontally subsampling said vertically filtered signal to produce a quincunx pattern;
• and
• a signal combiner, coupled to the main image signal source and the quincunx subsampler, for combining the main image signal and said compressed and quincunx sampled signal to generate a signal representing a combined image of the main and auxiliary images;
• wherein the auxiliary image sample source comprises:
• a source of an auxiliary image signal, including a video component and a synchronization component;
• an auxiliary analog-to-digital converter responsive to the auxiliary image signal video component, for generating samples representing the auxiliary video component;
• and
• an auxiliary timing signal generator, responsive to the auxiliary image signal synchronization component, for generating the auxiliary sample timing signal;
• and wherein
• the quincunx subsampler is further responsive to a timing signal from the auxiliary timing signal generator;
• the auxiliary timing signal generator further generates an auxiliary horizontal synchronization reset signal and an auxiliary field type signal having a first state during auxiliary video odd fields and a second state during auxiliary video even fields;
• and
• the quincunx subsampler comprises:
• a subsampler, coupled to the auxiliary sample source, and responsive to a subsample timing signal, for subsampling the auxiliary video component representative samples at times determined by the subsample timing signal;
• a timing signal divider, responsive to the auxiliary sample timing signal and a reset signal, for producing the subsample timing signal;
• and
• a reset signal generator, responsive to the auxiliary horizontal synchronization reset signal and the auxiliary field type signal, for generating a reset signal producing a first sampling pattern in even auxiliary fields and a second sampling pattern in odd auxiliary fields.

Apparatus for displaying a combined image of an auxiliary image and a main image, comprising:

• a source of a main image signal;
• a source of samples representing an auxiliary image signal;
• a quincunx subsampler, coupled to the auxiliary image sample source, for compressing said auxiliary signal by vertical filtering and horizontally subsampling said vertically filtered signal to produce a quincunx pattern;
• a signal combiner, coupled to the main image signal source and the quincunx subsampler, for combining the main image signal and said compressed and quincunx sampled signal to generate a signal representing a combined image of the main and auxiliary images;
• and
• a main timing signal generator, coupled to the main image signal source;
• wherein the signal combiner comprises:
• an inset image display generator, coupled to the quincunx subsampler and responsive to a timing signal from the main clock signal generator, for generating a signal representing an inset auxiliary image;
• and
• a multiplexer, having a first data input terminal coupled to the inset image display generator, a second data input terminal coupled to the main image signal source and an output terminal producing a signal representing the combined image;
• and wherein
• the main timing signal generator further produces a select signal having a first state when the signal from the inset image display generator forms the combined image, and a second state when main image signal forms the combined image;
• and
• the multiplexer further comprises a control input terminal responsive to the select signal, and couples the inset image signal to its output terminal when the select signal has the first state and the main image signal to its output terminal when the select signal has the second state;
• and wherein
• the main timing signal generator produces a main field type signal having a first state during an even main field, and a second state during an odd main field;
• and
• the inset image display generator produces an inset image signal using a first display pattern when the main field type signal has the first state, and using a second display pattern when the main field type signal has the second state.