Method and system for reducing reception of unwanted messages

Abstract

The invention relates to a method for determining a characteristic pattern for a speech message that is supplied in the form of a numerically encoded audio signal generated by means of a sampling process. Said method comprises at least the following steps for determining the characteristic pattern on the basis of the numerically encoded audio signal: in a first step, non-speech portions of the audio signal are suppressed in that irrelevant frequency ranges are filtered out by applying a suitable signal filter, particularly a bandpass filter, to the audio signal; in a second step, a copy command (SQR) is used in order to copy all elements of the numerically encoded audio signal into the positive number range; in a third step, an audio signal sampling rate characterizing the sampling process is adjusted; in a fourth step, the new value range of all elements of the numerically encoded audio signal is scaled with regard to a maximum value and a mean value, said new value range being the result of the adjustment of the sampling rate. The invention further relates to a system for carrying out the disclosed method as well as devices and a corresponding communication network.

Description

technical field [0001] The present invention relates to a method and system for reducing the receipt of undesired messages by applying feature templates. Background technique [0002] With the popularity of Internet telephony (Voice over IP, VoIP for short), VoIP users are more and more exposed to so-called SPIT (SPIT: SPAM over Internet Telephony, spam Internet telephony). Currently, advertising calls to traditional PSTN subscribers (PSTN: Public Switched Telephone Network) are usually always paid for by the calling party. And based on different billing models, the calling party can call VoIP users almost free of charge, which may lead to a large number of SPIT calls in the future. In particular, the possibility of sending recorded voice files in batches is attractive to advertising operators. It can be inferred from this that the VoIP users involved will request their respective VoIP providers to take appropriate measures to prevent unwanted incoming calls. [0003] As ...

AI Technical Summary

Problems solved by technology

[0006] Here, however, an exact comparison, e.g. in the form of a pure comparison at the level of the bitstream representing the messages to be compared, does not achieve the goal, because of slight changes that cannot be heard by the called party, e.g. by recoding or an occasional delay in the beginning of a message that may cause a difference between the compared messages

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