digital filtering circuitry decreasing the flow of words of a digital signal of the type used in telephone systems digital switch, digital filters used and trunk line circuits such crew

A OUTPUT CONVERTER YEAR HIGH SPEED (1024KHZ) PROVIDING WORDS FROM 1 TO 3 EB REPRESENTATIVE SIGNAL WORD STRIP LIMITED (0-4KHZ) trunk IN TELEPHONE LINE, THESE CIRCUITS TRANSFORMING THE SUITES WORDS OF 32 INCOMING SECURITIES AVERAGE COMPATIBLE WITH THE BAND THAT EXPRESS CALL AND EACH SAMPLE SPEECH BY LINEAR CODE AT LEAST 13EB WITH REDUCED FREQUENCY 32KHZ. THEY INCLUDE FILTER RECURSIF LOW PASS OF TRANSFORMING ORDER SECOND INPUT SIGNAL X (K) IN Y (K) X (K) (2-2) Y (K-1) - (1-22) Y ( K-2) AND FILTER NO RECURSIF 70 CASCADE, gIVING THE OUTPUT SIGNAL (A 1024KHZ AND 13EB): Y (K) Y (K) 2 Y (K-1) Y (K-2) IS THEN LU A 32KHZ IN REGISTER EXIT 80. 70 FILTER DOES AN ADDER 72 TWO AND REGISTERS 71, 74 RETENTION OF TWO SUCCESSIVE SAMPLES Y (K) 2 OF BY BEING A SINGLE TIME LEFT. IN RECURSIVE FILTER, THE RIGHT SHIFT (4 RESPECTIVELY AND 9EB) IN REGISTERS 62, 67 WITH THE FEEDBACK FROM THE DIVISION EB PREVIOUS 64, 68 LETS MAKE THE PRODUCTS BY 2 AND 2 WITHOUT USING MULTIPLIERS, WHILE MAINTAINING THE NOISE IN THE BAND AT A LEVEL LOW. THE OTHER THREE ARE MODULE BATTERIES (Y, Y, F). APPLICATION TO HOME DIGITAL SWITCHING TELEPHONE SYSTEMS AND PULSE MODULATION CODING.