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Non-linear acoustic echo canceller

A technology of echo cancellation and echo, which is applied in the direction of two-way sound reinforcement telephone system, telephone communication, electrical components, etc., and can solve the problem of DSP cost increase

Inactive Publication Date: 2009-12-30
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This approach can also cause an increase in DSP cost

Method used

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Embodiment Construction

[0029] figure 1 Denotes a device for receiving and transmitting audio signals, said device having an input channel 1 , a converter 2 , an inverse converter 3 , an output channel 4 , and linear echo cancellation means 50 . The circuit arrangement shown in this figure can be found, for example, in mobile telephones or hands-free sets. A digital signal is received on input channel 1 from a far end, such as a remote loudspeaker, and said signal is passed on to converter 2 . In the converter 2, said digital signal is converted into an analog signal by means of a D / A converter 21, then amplified by an amplifier 22 and finally converted into an audio signal by a loudspeaker 23. Part of this sound signal reaches the reverse converter 3, where the newly added noise is superimposed on this side along with most of the voice of the telephone user, and is captured by the microphone 31 and converted into an electrical signal. The amplitude of this electrical signal is adaptively adjusted ...

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Abstract

The invention relates to an echo canceling device and method for an arrangement for transmitting audio signals, in particular uttered speech with an echo filter for canceling echo. The echo filter is arranged between an input channel (1) and an output channel (4). The input channel (1) leads a first electrical input signal to a converter (2) for converting the electrical signal into a first audio signal. The output channel (4) transmits an electrical signal from a converter (3) which converts a second audio signal back into an electrical signal. In order to prevent non-linearly distorted echo in such an echo canceling device or method, a high-pass filter (8) is arranged in the input channel (1) which high-pass filter (8) has a cut-off frequency that is beyond the cut-off frequency of the high-pass behavior in the converter (2). The high-pass filter (8) is followed by a limiting element (9) which limits the amplitude of the input signal to the input range of the converter (2). By this means, non-linear behavior in the converter (2) is prevented so that non-linearly distorted echo cannot arise at all.

Description

technical field [0001] The present invention relates to an echo canceling device, a device for transmitting an audio signal (especially a voiced voice), said device comprising an echo filter for canceling an echo, said echo filter being arranged in an input channel and an output channel Among them, the input channel is used to receive the electrical input signal from the far end and guide it to a converter to convert the electrical signal into the first audio signal, and the output channel is used to output the electrical output signal from the reverse converter, and the reverse converter is used to convert the second audio signal back into an electrical signal and direct it to the far end. The invention also relates to a device for receiving and transmitting audio signals according to claim 9 . In addition, the invention also relates to an echo cancellation method. Finally, the invention also relates to a computer program using computer programming means in order to carry o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04M9/08
CPCH04M9/082
Inventor A·斯坦格
Owner NXP BV
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