Non-linearity estimation method and device
First Claim
Patent Images
1. Process for estimating non-linearity of a device (11, 23, 62) comprising steps of generating one or more pilot signals (10;
- 19, 20;
65) upstream of the device for measuring components of their intermodulation products at the output of the device, characterized in that the pilot signals pass through at least one known non-linear device (15;
30;
37, 40;
48) delivering intermodulation products of known characteristics, in that at least one of the components of the known intermodulation products is harnessed in order to modulate, with the aid of synchronous detection circuits (17;
27,
35), at least one signal relating to the components to be measured, and in that the pilot signals (10;
19, 20;
65) passing through the known non-linear device (15;
30;
37, 40;
48) are tapped off by filtering (14;
28,
29) the output signal from the device to be measured (11,
23).
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Abstract
The process is characterized in that the pilot signals (10) generated upstream of the device (11) whose non-linearity it is desired to measure pass through a known non-linear device (15) delivering intermodulation products of known characteristics and in that at least one of the known intermodulation products is harnessed in order to modulate, with the aid of synchronous detection circuits (17), at least one of the signals relating to the components of the intermodulation products of the device to be measured.
The applications pertain to the analog transmission of television signals over optical fibers.
39 Citations
11 Claims
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1. Process for estimating non-linearity of a device (11, 23, 62) comprising steps of generating one or more pilot signals (10;
- 19, 20;
65) upstream of the device for measuring components of their intermodulation products at the output of the device, characterized in that the pilot signals pass through at least one known non-linear device (15;
30;
37, 40;
48) delivering intermodulation products of known characteristics, in that at least one of the components of the known intermodulation products is harnessed in order to modulate, with the aid of synchronous detection circuits (17;
27,
35), at least one signal relating to the components to be measured, and in that the pilot signals (10;
19, 20;
65) passing through the known non-linear device (15;
30;
37, 40;
48) are tapped off by filtering (14;
28,
29) the output signal from the device to be measured (11,
23). - View Dependent Claims (3, 4, 6, 7, 8)
- 19, 20;
-
2. Process for estimating non-linearity of a device (11, 23, 62) comprising steps of generating one or more pilot signals (10;
- 19, 20;
65) upstream of the device for measuring components of their intermodulation products at the output of the device, characterized in that the pilot signals pass through at least one known non-linear device (15;
30;
37, 40;
48) delivering intermodulation products of known characteristics, and in that at least one of the components of the known intermodulation products (F1-F2) is harnessed in order to transpose at least one of the components to be measured (F1-F2) to a specified frequency (F3) chosen as frequency of modulation of a transposed signal (F3), which modulation is effected by synchronous detection circuits (27,
35). - View Dependent Claims (5)
- 19, 20;
-
9. Estimator of non-linearity of a device (11, 23, 62) comprising a generator of pilot signals (10;
- 29, 20;
65), the pilot signals passing through the device, characterized in that it includes;a known non-linear device (15;
30;
37, 40;
48) receiving the pilot signals from the output of the device (11, 23,
62) so as to generate known intermodulation products at a frequency,a synchronous detection circuit (17;
27,
35) receiving one of the components of the intermodulation products of the device to be measured (11, 23,
72), a signal for modulation of the synchronous detection circuit being the component at the same frequency of the known intermodulation products.
- 29, 20;
-
10. Estimator of non-linearity of a device (11, 23, 62) comprising a generator of pilot signals (10;
- 29, 20;
65), the pilot signals passing through the device, characterized in that it includes;a synchronous detection circuit (17;
27,
35) operating at a specified modulation frequency (F3),at least one known non-linear device (55, 57,
59) coupled to the output of the device (11, 23,
62) for transposing a component of the intermodulation products to be measured to a frequency equal to that of the modulation signal (F3) of the synchronous detection circuit (17;
27,
35), the transposed signal being transmitted to the input of the synchronous detection circuit, relating to the pilot signals, and being of known characteristics. - View Dependent Claims (11)
- 29, 20;
Specification