公开(公告)号：CA2007012A1

公开(公告)日：1990-08-14

申请号：CA2007012

申请日：1990-01-03

Applicant: MOTOROLA INC

Inventor： ERICKSON PAUL M ,  MATZ JOHN E ,  GROCH TIM J ,  STEDMAN ROBERT B ,  SHAUGHNESSY MARK L ,  KANDAH TAISIR Y

IPC: H04H20/67

公开(公告)号：CA2007012C

公开(公告)日：1993-06-01

申请号：CA2007012

申请日：1990-01-03

Applicant: MOTOROLA INC

Inventor： ERICKSON PAUL M ,  MATZ JOHN E ,  GROCH TIM J ,  STEDMAN ROBERT B ,  SHAUGHNESSY MARK L ,  KANDAH TAISIR Y

IPC: H04H20/67 ,  H04B1/04

Abstract: A simulcast broadcast uses digital signal processing techniques to scale pulse coded modulation samples of a signal for broadcast. Samples are adjusted to fully utilize all quantization levels representable by an 8-bit word. Time delay is adjustable using digital techniques by writing and reading data into and out of a RAM. Signal amplitude is adjustable by multiplying samples by a numeric factor. A computer can be used to adjust processing delay and amplification of the digital signal processor.

公开(公告)号：CA2145652A1

公开(公告)日：1995-02-16

申请号：CA2145652

申请日：1994-06-20

Applicant: MOTOROLA INC

Inventor： MATZ JOHN E ,  MITZLAFF JAMES E

IPC: H03G3/20 ,  H04B1/04

Abstract: A method and apparatus is provided for controlling peak envelope power level in a power amplifier (PA) (10). The method includes the steps of measuring (101) a first peak envelope power value of an input of the PA during a first time period, comparing (102) the first peak envelope power value with a threshold value, and introducing a phase change (103) into a selected signal of a plurality of signals being amplified by the PA when the first peak envelope power value exceeds the threshold. The method further includes measuring (104) a second peak envelope power value during a second time period, comparing (105) the first and second peak envelope power values, and reversing (106) the phase change to the selected signal when the second peak envelope power value exceeds the first peak envelope power value.