Digital color television camera apparatus for selectively outputting component or composite PAL/NTSC signals

Digital color television camera apparatus for selectively producing either a digital component video signal or a digital composite video signal in accordance with either a first or a second television standard, comprising:

• image means for providing digital primary color image signals at a predetermined sampling clock rate 2f.sub.s from which said digital component or digital composite video signal is derived;
• matrix means coupled to receive said digital primary color image signals at said sampling clock rate for producing color difference signals therefrom at said sampling clock rate;
• down sampling means coupled to said matrix means for down sampling at least one of the color difference signals to reduce the sampling clock rate thereof;
• and digital low pass filtering means operable in accordance with said first television standard to limit the frequency band of the down-sampled color difference signal by providing predetermined selected attenuation at pre-established frequencies of the down- sampled color difference signal, said digital low pass filtering means being operable in accordance with said second television standard to limit the frequency band of the down-sampled color difference signal by providing predetermined selected attenuation at different pre-established frequencies of the down-sampled color difference signal, thereby producing a band-limited color difference signal for said digital composite video signal.

A common encoder for a color television camera operable in accordance with first or second television standards to encode digital primary color image signals at a sampling clock rate into digital component or digital composite video signals, said encoder comprising luminance signal generating means for combining the digital primary color image signals to generate a luminance signal therefrom;

• level setting means for establishing predetermined quantizing values for said luminance signal to represent respective reference levels of the digital component and digital composite video signals when the color television camera operates in accordance with said first or second television standard;
• matrix means for combining the luminance signal and at least predetermined ones of said digital primary color image signals to produce color difference components at aid sampling clock rate;
• first color difference signal means coupled to receive and selectively produce from the color difference components digital color difference signals in accordance with said first or second television standard;
• first downsampling means for providing the digital color difference signals with a clock rate reduced from said sampling clock rate;
• first low pass filter mean for frequency band limiting selected ones of the reduced clock rate first color difference signals in said first and second television standards;
• second color difference signal means for combining the digital primary color image signals to generate a predetermined digital color difference signal in accordance with said first television standard;
• second downsampling means for downsampling the predetermined digital color difference signal to a clock rate less than said sampling clock rate;
• second low pass filter means for frequency band limiting either the down-sampled predetermined digital color difference signal or one of the digital color difference signals of reduced clock rate produced in accordance with said second television standard;
• and modulating means for modulating a subcarrier with the band limited color difference signals provided by said first and second low pass filter means for use in said digital composite video signal.