Translation of "Signalrauschabstand" in English

The ideal sampling clock signal leads, for example, to a maximum signal-to-noise ratio SNR of the received signal.

With the built-in signal enhancement alogrithm the S/N ratio can be further improved.

The camcorder has a signal to noise ratio of 60dB (typical) with 3DNR noise reduction processing.

As a result the signal-noise ratio in respect of determining distance worsens with increasing distance to the reflecting object.

For example, the reception field strength or the signal-to-noise ratio can be used as measurement criteria for the quality.

This allows achieving a signal noise distance of at least 70 dB, which can be considered to be sufficient.

Autocorrelation belongs to the most efficient—although not linear—method for bringing into prominence periodic or quasi-periodic signals as compared to noise, therefore to raise the signal/noise interval.

In particular, the present invention proposes that the signal-to-noise ratio of the received signal be evaluated, for example, after an idle slot, that appropriate power adjustment information be produced as a function of this, and that this information be transmitted to the transmitter during the next two timeslots immediately following the idle slot.

Using this feature, the S/N ratio is improved to 60 dB, which is the highest level of noise reduction in a 1/2-inch-type Full HD shoulder camcorder.

To this end, the client has a means for determining and/or providing the properties of the radio signals of the fixedly positioned radio transmitters, the properties generally being characterized by an ID of a fixedly positioned radio transmitter and its electromagnetic signal characteristic, such as a reception field strength, a receive spectrum, or a received signal-to-noise ratio.

In the receiver, the signal-to-noise ratio of the signal being received from the transmitter at that time is measured in order to determine the TPC or power adjustment information to be transmitted during the timeslot #n is compared with a reference value and is used to produce the TPC information TPC n .

In order to produce the TPC information to be transmitted during the next timeslot #n+1, the TPC information from the previous timeslot is simply repeated, that is to say TPC n+1 =TPC n, rather than evaluating the signal-to-noise ratio of the transmission signal once again.

For this purpose, the received power or the signal-to-noise ratio of the received signal is compared with a predetermined reference value in the receiver, and the value for the power adjustment command is determined as a function of the discrepancy.

With the appearance of pixels below a pre-determined limiting values, the parameters, for instance the number of image averagings, is automatically increased, whereby the signal transport distance is increased, as well as improved, in order to then take pre-transmission images again.

In a further advantageous embodiment variant of the invention the stable transmission channel has a higher signal-to-noise ratio than the normal transmission channel.

The master has the task of allocating the available transmission channels (carrier frequencies) in an optimal manner to the available slaves, in particular during power-up, on the basis of measurements that determine the signal-to-noise ratio.

Preferentially is to be understood in this context as meaning that for stability reasons, on account of the transmission concept used (OFDM), the “most stable” transmission channels (highest signal-to-noise ratio) are assigned by preference to the most sensitive bus users, that is to say safety devices (safe slaves).

The safe slave having the highest safety relevance in respect of the connected safe slaves is assigned the most stable transmission channel, i.e. the channel having the highest signal-to-noise ratio.

With regard to said subgroups of the normal slave type the master can also carry out an explicit assignment of the transmission channels such that e.g. the slaves of the first normal slave type are assigned more stable transmission channels, i.e. the carrier frequency has a higher signal-to-noise ratio, than the slaves of the second normal slave type.

Additionally, the embodiment described below, by means of an image enhancing assembly, offers a way of enhancing the electron stream in connection with an MCP and in this way to increase the signal-to-noise distance and thus the distance resolution.

A photoelectric element of such a large side length, by virtue of the large area involved, has a particularly high level of sensitivity in relation to incident light and thus generates a particularly great photoelectric current which provides for determining distance with an improved signal-to-noise ratio and thus a reduced measurement error.

When using an image enhancer having a secondary electron multiplier (MCP), the energy of the electrons generated from the light pulse is again additionally enhanced in the module, which increases the signal-to-noise ratio to the noise of the sensor/system electronics.

That means that the signal-to-noise ratio additionally worsens for the measurement procedure because a smaller integrated useful signal is confronted with a constant noise signal.

Here, different sample rates can be tested one after other until one of the correlation has the best signal noise distance.

Trials have shown that by using the invention the signal-to-noise ratio in the receiving signal is improved by approximately 3 to 4 dB.

With the A/D converter illustrated schematically in FIG. 3 therefore noise shaping of the third order can be executed, whereby in the lower frequency range the quantization noise and therefore the signal-to-noise ratio can be far better improved compared to an A/D converter without feedback of the quantization error.