DE102005039195A1 - Apparatus for reproducing sound signals - Google Patents

Abstract

Device for reproducing sound signals, in particular as part of a public address system, with at least one electrodynamic loudspeaker and means for improving the output signal by influencing the input signal, the means for improving the loudspeaker behavior influencing the rising and / or falling edges of the input signal such that the slopes of the Rising edges and / or falling edges of the output signal are at least approximated to the actual or desired slopes.

Description

The The present invention relates to a device for reproducing Sound signals, in particular as part of a public address system, with at least one electrodynamic loudspeaker and means for Improvement of the output signal by influencing the input signal.

Electrodynamic Loudspeakers have been known for a long time and are used in a variety of ways among other things also for the sound of large rooms or in the free one. The usual from an amplifier supplied input signals for The loudspeaker causes the loudspeaker diaphragm to vibrate. This moves the air around the speaker and creates it an output signal that is picked up by the human ear can.

The human ear is listening different frequencies are different loud. The differences are especially at low volume extraordinary big. There are therefore known electrical circuits by which the volume certain frequency ranges is lowered or raised. In spite of These and other enhancements give familiar speakers Nevertheless, the input signal is not yet faultless again, at least not over the entire frequency range and the entire volume range.

Of the Invention is the object of a device of the initially be improved in terms of their playback behavior.

These Task is solved by the means comprise the rising edges and / or falling edges of the input signal influence so that the slopes of the rising edges and / or the falling edges of the output signal the actual or desired Slopes at least approximated are.

The Invention is based on the recognition that electrodynamic speakers their own inertia and that this inertia in particular the transient and decay behavior of the Speaker. About that In addition, the invention is based on the recognition that the inputs and Therefore, the decay behavior of a loudspeaker is particularly important are because different musical instruments and also the human Voice each one characteristic signal rise and - waste time. So humans recognize different things Instruments among other things also in particular on the so-called Attack, but also on the release. Give conventional speakers because of their inertia Rise and fall edges did not recur correctly, so the identification the instruments is difficult.

By the influence of the leading edges and / or trailing edges of the Input signal such that the corresponding edges of the output signal approximated to the input signal are, so the playback behavior of the speaker can be improved become. The more the shape of the edges of the output signal to the The shape of the edges of the input signal is approximate, the more accurate there is the speaker the characteristics of each instrument and Voices again. This results in a much clearer and more differentiated Sound. For certain applications can the slopes of the leading and trailing edges also desired Gradients and not the actual Gradients approximated become. For example, it is desirable for certain styles of music that To make the slope of the descent flatter, to reproduce the sound longer, as the actual Input signal corresponds.

According to the invention Level of the rising edges and the falling edges of the input signal especially raised or lowered depending on the frequency. It was namely found that speakers in particular at low frequencies too slow react while they do not react so slowly at very high frequencies. Therefore, be the rising edges of lower frequencies preferably raised more and the high frequencies less strong or not at all. At the waste flanks the influence is reversed, since the speaker inertia to do so leads, that sound signals, especially at low frequencies, too slow subside. By lowering the output signal can counteract this become. At high frequencies, the falling edge of the output signal lowered less.

The Raising and lowering can be after a predetermined amount or relationship respectively. The raising or lowering can thus percentage of the input signal depend or after a fixed amount. But it is important in any case, that the raising and lowering is done so that the output signal from the rising edge steadily into the continuous signal, so-called sustain, passes over and from this steadily into the descent flank.

The influencing of the input signal is carried out in particular so that predetermined frequency ranges are each influenced in a certain way. Thus, low frequencies can be influenced differently than high frequencies, and these in turn different than medium frequencies. By dividing into areas, the effort can be kept low.

To In a particular embodiment, five frequency ranges are provided. It basically can also less or in particular more frequency ranges provided be. The more frequency ranges are provided, the more accurate the output signal can be adapted to the input signal.

The Influences are particularly designed so that in the low and midrange the level of the rising edge stronger raised and the level of the falling edge is lowered more than in the high frequency range. This allows the inertial behavior electrodynamic Loudspeakers are taken into account so that the amplitude increase and waste behavior the different areas are aligned and integrated gives the input signal largely corresponding output signal.

The Influencing the input signal can also be dependent on the volume. This allows for the dynamic behavior of the speaker be worn.

To Another embodiment of the invention are different Types of influence, especially different gradients the rising and / or falling edges preset. The user This allows a specific playback behavior of the speaker choose. For example, you can Eight different types of influence can be preset, the different music styles or events in the open or in closed rooms assigned.

Prefers is the reaction time of the influencing agent 1 ms or less. Thereby The influence can be done so fast that it is practically impossible audible is.

To the Raising the input signal can expander, used for lowering compressors. Preference is given to combined Units, called compander used.

To A particularly preferred embodiment of the invention are pro Frequency range used per two compander. A compander serves the raising or lowering of the rising edge and the other the Raise or lower the descent slope.

The Means for influencing the input signal have per frequency range prefers one hundred or more dynamic levels. This can be a very accurate adaptation of the output signal to the input signal be achieved.

One embodiment The invention is illustrated in the drawing and will be described below described. They show, in each case in a schematic representation,

1 a block diagram of a three-way loudspeaker system according to the invention,

2 a leading edge of a square wave signal, and

3 an example of a sound signal.

This in 1 represented loudspeaker system according to the invention comprises an input 1 for inputting an input signal, subsequently an electronic circuit 2 for influencing the sound, then a first crossover 3 for frequency division of the signal into two signal paths 4 and 5 , The first signal path is followed by an amplifier 6 and a second crossover 7 , The second crossover 7 splits the signal of the first signal path 4 again in two signal paths 8th and 9 on. The third signal path 8th leads to a woofer 10 and the fourth signal path 9 to a midrange speaker 11 , In the second signal path 5 follows also an amplifier 12 of which a fifth signal path 13 to a tweeter 14 leads.

The electrical circuit 2 includes means for influencing the input signal, namely ten companders 15 of which two each are assigned to a specific frequency range. For this purpose, the input signal is as shown in five frequency ranges 16 divided up. After the companders 15 the signal is brought together again. Every compander 15 has one hundred dynamic levels, giving a total of one thousand different setting options.

The division of the frequency ranges 16 For example, a first frequency range is from 30 to 130 Hz, a second frequency range from 130 to 600 Hz, a third frequency range from 600 to 3500 Hz, a fourth frequency range from 3500 to 7000 Hz and a fifth frequency range from 7000 to 20,000 Hz With this classification a very good simulation of the input signal could be achieved. In principle, however, a division into more or less frequency ranges is possible. Also compander with more or less dynamic levels can be used. Decisive is the presetting of the dynamic levels of the compander 15 and the integration of the set compander 15 in the speaker system. The sound according to the invention The speaker system thereby has an exact playback behavior without the user having to make a subsequent adjustment.

In 2 is exemplified how an input signal is affected. Shown is the rising edge of a rectangular input signal 17 , the associated output signal 18 a conventional loudspeaker, the input signal influenced according to the invention 19 whose level is opposite to the input signal 17 is raised, as well as the resulting output signal 20 a loudspeaker according to the invention. As you can see, this is the output signal 20 of the speaker according to the invention by this influence much closer to the input signal 17 as the output signal 18 a conventional speaker.

The inventive increase of the input signal 17 done so that the output signal 20 steadily from the rising edge into the continuous signal, so-called sustain. In a correspondingly reverse manner, the falling edges are influenced in order to achieve an approximation of the output signal to the input signal.

In 3 Accordingly, the waveforms are shown at a sound signal, such as a battered piano tone. The signal curve 21 corresponds to the input waveform, the curve 22 the output signal curve of a conventional speaker and curve 23 the course of a loudspeaker according to the invention. As you can see, here is the output signal 23 of the loudspeaker according to the invention the input signal 21 approximated. The reproduction by the speaker according to the invention is therefore significantly improved over conventional speakers.

1

entrance

2

electronic circuit

3

first crossover

4

first pathway

5

second pathway

6

amplifier

7

second crossover

8th

third pathway

9

fourth pathway

10

woofer

11

Mid-range speaker

12

amplifier

13

fifth signal path

14

tweeter

15

compander

16

frequency range

17

input

18

output

19

raised signal

20

output

21

input

22

output

23

output

Claims (16)

Device for reproducing sound signals, in particular as part of a public address system, with at least one electrodynamic loudspeaker ( 10 . 11 . 14 ) and funds ( 2 ) for improving the output signal by influencing the input signal, characterized in that the means ( 2 ) influence the rising edges and / or falling edges of the input signal so that the slopes of the rising edges and / or falling edges of the output signal are at least approximated to the actual or desired slopes. Device according to claim 1, characterized in that the means ( 2 ) raise or lower the level of the rising edges and / or falling edges of the input signal. Device according to claim 2, characterized in that that the raising and / or lowering of the level a predetermined Amount or ratio equivalent. Device according to claim 3, characterized in that that the raising or lowering takes place so that the output signal a steady transition from the rising edge into the continuous signal and from this into the Descent signal has. Device according to one of the preceding claims, characterized in that the means ( 2 ) are designed so that the influence of the input signal at different frequencies is different. Device according to claim 5, characterized in that the means ( 2 ) are designed to influence predetermined frequency ranges of the input signal in a particular manner. Apparatus according to claim 6, characterized in that five or more frequency ranges ( 16 ). Device according to one of claims 3 to 7, characterized in that the means ( 2 ) are designed so that in the low and midrange the level of the rising edges are raised more and the falling edges are lowered more than in the high tone range. Device according to one of the preceding claims, characterized in that the means ( 2 ) are designed so that the influence is volume dependent. Device according to one of the preceding claims, characterized in that the means ( 2 ) are integrated in the speaker system or formed as a separate component, in particular own device. Device according to claim 10, characterized in that that different types of influence, in particular different Slopes of the rising and / or falling edges are preset. Device according to one of the preceding claims, characterized characterized in that the reaction time of the agents is 1 ms or less is. Device according to one of the preceding claims, characterized in that the means ( 2 ) Expander for lifting and compressors for lowering the signal level include. Device according to one of the preceding claims, characterized in that the means ( 2 ) Compander ( 15 ) for raising and / or lowering the signal level. Device according to one of the preceding claims, characterized in that per frequency range ( 16 ) two compander ( 15 ) are provided. Device according to one of the preceding claims, characterized in that each compander ( 15 ) has one hundred or more dynamic levels.