Claims
- 1. An expander system comprising:
- a source of repetitive pulse signals, having pulse widths Ti, genererated from an input AC-signal;
- an output terminal;
- a phase modulator, coupled to said source, and having a control input terminal;
- an expander filter and amplifier means serially coupled in order between said phase modulator and said output terminal; and
- a control stage, coupled between said source and said control input terminal of said phase modulator, for generating a control signal selectively enabling and inhibiting said phase modulator such that, within the time length Ti of a one of said repetitive pulse signals, at least two phase changes of at least approximately 180 degrees are produced.
- 2. The expander system according to claim 1, wherein the phase modulator produces two phase changes after the time lengths t1 and t2 satisfying the condition:
- t1+t2=Ti,
- wherein the time lengths t1 and t2 are counted at least approximately from the starting point of said one of said repetitive pulse signals.
- 3. The expander system according to claim 2, wherein for the time lengths t1 and t2, there are valid the following conditions:
- (t2-t1)/Ti=0.71.+-.0.1
- B.multidot.Ti=2.35.+-.0.1
- wherein B is the bandwidth of said repetitive pulse signals.
- 4. The expander system according to claim 1, wherein the phase modulator produces four phase changes after the time lengths t1, t2, t3 and t4 satisfying the condition:
- t1+t4=t2+t3=Ti
- wherein the time lengths t1, t2, t3 and t4 are counted at least approximately from the starting point of said one of said repetitive pulse signals.
- 5. The expander system according to claim 4, wherein the the time lengths t1, t2, t3 and t4, there are valid the following conditions:
- (t4-t1)/Ti=0.83.+-.0.1
- (t3-t2)/Ti=0.50.+-.0.1
- B.multidot.Ti=3.91.+-.0.1
- wherein B is the bandwidth of said repetitive pulse signals.
Priority Claims (1)
Number |
Date |
Country |
Kind |
04566/85 |
Oct 1985 |
CHX |
|
Parent Case Info
This is a continuation of application Ser. No. 06/876,145 filed June 19, 1986 now U.S. Pat. No. 4,812,771, Mar. 14, 1989.
US Referenced Citations (8)
Continuations (1)
|
Number |
Date |
Country |
Parent |
876145 |
Jun 1986 |
|