DE1955975C - Device for the interpolation of periodic signal sequences - Google Patents

Description

45

The invention relates to a device for interpolating the periods of successive waves a signal generator that emits two approximately sinusoidal signal sequences that are phase-shifted by 90 °, with a frequency doubler, in which on the way of assembling from parts of the original Signal sequences twice the frequency is generated phase-true and frequency-independent.

In the device according to the main patent, two square-wave signals are generated whose period lengths are half as large as in the original signal sequences and which are ^{mutually shifted by 1} I * of their period length.

In summary, the edge spacings of the two square-wave signals Vn correspond to the input period length. With the help of a so-called quarter circuit, these can be evaluated with the correct sign.

The aim of the present invention is to counter this to achieve further interpolation of the original signal sequences by a factor of 2.

Building on the subject of the Main patent this is achieved by a further downstream frequency doubler, the first Square-wave signal is generated, the edges of which, each beginning with a zero crossing of the original Signal sequences, successive at a distance of Vs from their period length, and by another Signal generator, which from the original signal sequences by direct frequency quadrupling Generates a second square-wave signal by means of full-wave rectification and superimposition of signal sequences, which the. has the same edge spacing as the first square-wave signal, but phase-shifted against this by four times the period length of the original signal sequences is.

In summary, the two square-wave signals result in an edge separation equal to four times the length of the input period.

In a preferred embodiment of the invention, the signal generator is for the second square-wave signal constructed in such a way that it has the two-way rectified original signal sequences with her ^ n two-way rectified sum or difference signals combined, and that the combination signal is passed via a trigger.

The invention is now based on the Fi g. 1 to 6 explained in more detail.

In the one shown in FIG. 1, shown as a block diagram, is a frequency doubler of the type described in the main patent, which consists of the two inputted original signal sequences S ₁ and S, (FIG. 2) two square-wave _{signals S, and S 4} (F i g. 3) The two signals S _{3 and} S ₄ are linked with the aid of a further frequency doubler 1 of known design, which can for example consist of logic circuits, so that a square-wave signal S, (FIG «Of the period length P of the signal sequences S ₁ and S ₂ , respectively.

From the two original ones. Signal sequences S ₁ and S ₂ are also generated with the help of a further signal generator II, a further square wave signal S ₁₁ (Fig. 6) with the same period length as the square wave _{signal S 5} (Fig. 4), which corresponds to this vie of the input period length P ( Fig. 2) is out of phase.

The square-wave _{signal S 11} is obtained in the signal generator II as follows:

The two original signal sequences S ₁ and S ₂ are converted via full-wave rectifiers 3 and 4 into signal sequences S ₀ and S ₇ (FIG. 5). Furthermore, the signals S ₁ and S _{2 are combined} in an addition stage 5 and subtraction stage 6 and processed further in intermediate rectifiers 7 and 8, which operate in opposition to rectifiers 3 and 4, so that signal sequences 5 _H and S ₉ (F i g . 5) arise.

The signal sequences S ₆ , S ₇ , S _H and S ₉ are then combined in the addition stage 9 to form a triangle-like signal S ₁₀ (FIG. 5). After this signal S _{1n has been} triggered in a trigger 10, a square-wave _{signal S 11} (FIG. 6) arises with edge spacings Ve of the period length P with a phase shift of Vn period length compared to the signal. (Fig. 4) .. The signal sequences S ₅ and S ₁₁ are then evaluated in a circuit 11 of known type.

1 sheet of drawings

Claims (2)

Patent claims: 1. Device for interpolating the periods of successive waves of a signal generator, which emits two approximately sinusoidal signal sequences phase-shifted by 90 °, with a frequency doubler, in which, by assembling parts of the original signal sequences, double the frequency is generated in phase and frequency-independent according to the German patent 1 474 140, characterized by a further downstream frequency doubler (1) which _{generates a first square-wave signal (S 5} ) read edges, each beginning with a zero crossing of the original signal sequences (S ₁ , S ₂ ), at a distance of Ve from those Period length (P) successively, and by a further signal generator (II), which generates a second square-wave signal (S _n ) from the original signal sequences (S ₁ , S ₃ ) by direct frequency quadrupling by means of double-wave rectification and superposition of signal sequences, which is the same Edge distance like the first rectangle ignal (S ₅ ) , but is phase-shifted by Vte of the period length (P) of the original signal sequences (S ₁ , S ₂ ). 2. Device according to claim 1, characterized in that the S igii al generator (II) for the second rectangle _{signal (S 11} ) is constructed in such a way that it has the two-way rectified original signal sequences (S ₆ , S ₁ ) with their full-wave rectified sum (S ₈ ) or difference signals (Sg) combined, and that the combination 35 tion signal (S ₁₀ ) is performed via a trigger (10).