Dual burst locked oscillator architecture for an analog television receiver

A dual burst locked oscillator (BLO) architecture for performing a color information decoding on a composite video signal comprising modulated color information for an analog television receiver, said dual BLO architecture comprising:

• a first BLO that expedites said color information decoding, said first BLO comprising:
• a first burst accumulator that receives a burst gate signal from a horizontal and vertical synchronization (HV SYNC), wherein said HV SYNC converts a composite video signal to said burst gate signal;
• a first BLO controller operatively connected to said first burst accumulator, wherein said first BLO controller calculates a frequency offset;
• a first digital voltage controlled oscillator (VCO) operatively connected to said first BLO controller;
• and
• a first phase detector operatively connected to said digital VCO and operatively connected to said first burst accumulator;
• and
• a second BLO operatively connected with said first BLO that performs said color information decoding, said second BLO comprising:
• a second burst accumulator that receives said burst gate signal from said HV SYNC;
• a second BLO controller operatively connected to said second burst accumulator, wherein said second BLO controller receives said frequency offset from said first BLO controller;
• a second digital VCO operatively connected to said second BLO controller;
• a second phase detector operatively connected to said second digital VCO, wherein said second phase detector receives a recovered color sub-carrier tone from said second digital VCO, wherein said second phase detector mixes said modulated color information of said CVBS and said recovered color sub-carrier tone to obtain a mixed down color information;
• and
• a low pass filter (LPF) operatively connected to said second phase detector, wherein said low pass filter recovers color information from said mixed down color information by decoding said mixed down color information.

An analog television apparatus comprising:

• a receiver that reproduces a local color sub-carrier tone with a same frequency and phase as a transmitted color sub-carrier tone, said receiver comprising:
• a first burst locked oscillator (BLO) operated in a first loop gain;
• and
• a second burst locked oscillator (BLO) operated in second loop gain operatively connected to said first BLO, wherein said first loop gain is greater than said second loop gain;
• a memory unit operatively connected to said receiver and comprising a programmable set of instructions;
• a display unit operatively connected to said memory unit;
• a processor that executes said programmable set of instructions for performing color information decoding on a composite video signal comprising modulated color information, wherein said processor:
• receives, in a first burst accumulator, a mixed down color information directly from a first phase detector without passing said mixed down color information through a low pass filter (LPF);
• converts said composite video signal to a burst gate signal;
• accumulates one or more of said burst gate signal;
• calculates a frequency offset for said second BLO when said first BLO operates in said first loop gain;
• receives, in a second phase detector, a recovered color sub-carrier tone;
• mixes said recovered color sub-carrier tone with said modulated color information;
• and
• recovers, in a low pass filter, color information from said mixed down color information by decoding said mixed down color information.