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Apparatus for generating harmonics in an audio signal

a technology of audio signal and harmonics, applied in the direction of automatic tone/bandwidth control, tone control, transducer casing/cabinet/support, etc., can solve the problem of overdrive of final amplifier and loudspeaker, muddy tone finally radiated by the loudspeaker, and more expensive production costs. achieve the effect of improving the audio impression for a listener

Inactive Publication Date: 2005-06-30
VIERTHALER MATTHIAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016] Advantageously, a system of the present invention creates an improved audio impression for a listener when he hears an audio signal that is radiated by loudspeakers with a relatively high lower corner frequency.

Problems solved by technology

The lower the limit frequency of a loudspeaker, the more expensive it is to produce.
However, this can cause the final amplifier and the loudspeakers to be overdriven.
The result of this is that the tone finally radiated by the loudspeaker sounds very muddy.

Method used

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  • Apparatus for generating harmonics in an audio signal
  • Apparatus for generating harmonics in an audio signal
  • Apparatus for generating harmonics in an audio signal

Examples

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Embodiment Construction

[0023]FIG. 1 illustrates a circuit arrangement 10, in which an audio input signal si on a line 20 is conducted to the input terminal of an adder stage 22. The output of the adder stage 22 is connected for example to a loudspeaker or to an amplifier (not shown). The input signal si is also conducted via a filter device, here a low-pass filter 24 or a band-pass filter, to a nonlinear circuit unit 26, which generates harmonics from the filtered signal. The filter arrangement is used to determine the dominating fundamental frequency in the input signal si on the line 20. From this, the nonlinear circuit 26 generates harmonics and conducts these to a second input terminal of the adder stage 22. It is essential that the corner frequency fc of the filter 24 is adjustable.

[0024]FIG. 2 illustrates a somewhat more detailed circuit embodiment than FIG. 1 for generating harmonics in an audio signal. The filter includes a series circuit of a first low-pass filter 32, a following second low-pass...

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Abstract

An apparatus for generating harmonics in an audio signal with an adder stage, which can add signals from a first signal line and a second signal line, such that an audio signal with harmonics can be tested at the output of the adder stage and such that a filter device and a nonlinear circuit device are situated in the second signal line, characterized in that a corner frequency of the filter device is adjustable

Description

BACKGROUND OF THE INVENTION [0001] The invention relates to an apparatus and method for generating harmonics in an audio signal. [0002] Methods and circuits for generating harmonics are used in devices for acoustic reproduction, such as television receivers, radio receivers, and stereo systems, to compensate the frequency response of the loudspeakers, in order to improve acoustic reproduction and also to prevent the device or the system from being overdriven. [0003] A critical element in a device for acoustic reproduction is the loudspeaker, whose acoustic pressure, below a structure-based limit frequency, drops about 40 db per decade. This corresponds to the transmission function of a second-order filter. On the other hand, bass reflex and transmission line loudspeakers have transmission functions corresponding to a filter of higher order. The lower limit frequency typically lies between about 50 Hz and 200 Hz. The lower the limit frequency of a loudspeaker, the more expensive it i...

Claims

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Application Information

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IPC IPC(8): H03G5/18H04R3/04H04S7/00
CPCH04R3/04H04S7/00H03G5/18
Inventor VIERTHALER, MATTHIAS
Owner VIERTHALER MATTHIAS
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