Topic
Call-progress tone
About: Call-progress tone is a research topic. Over the lifetime, 30 publications have been published within this topic receiving 364 citations.
Papers
Patent•
21 Dec 1998TL;DR: In this paper, call progress tone recognition is combined with speech recognition to obtain an improved estimate of call progress, and an automated call establishment system using the methods is also disclosed, where calls to machines may be disconnected or connected to a pre-recorded message, while calls to humans may be connected to call handling agents or a different prerecorded messages.
Abstract: Methods of estimating if a voice signal is more likely formed by a machine or human, are disclosed. The methods are particularly well suited for use in an automated call establishment system. A voice signal is received at a computing device. Speech recognition steps are applied to the voice signal to recognize spoken words in the signal. Recognized words are compared to words likely generated by a machine or a live human. Based on the comparison, an estimate is made that the voice signal more likely originates with a machine or a human. Conventional call progress tone recognition may be combined with speech recognition to obtain an improved estimate of call progress. As a result of the methods, calls to machines may be disconnected or connected to a pre-recorded message, while calls to humans may be connected to call handling agents or a different pre-recorded messages. An automated call establishment system using the methods is also disclosed.
89 citations
Patent•
12 Sep 2004
TL;DR: In this paper, a method and a system for providing configurabale call progress tones in a telephony session by identifying a receiver of the telephony sessions, selecting a tone in accordance with the preferences of the receiver and providing a configurable call progress tone of the selected tones.
Abstract: A method and a system for providing configurabale call progress tones in a telephony session by identifying a receiver of the telephony session, selecting a tone in accordance with the preferences of the receiver and providing a configurable call progress tone of the selected tones.
52 citations
Patent•
23 Aug 1989TL;DR: In this paper, a tone type recognition method capable of recognizing a call progress state of a central office line switching system by using a tone detector is presented. But the method is limited to a single tone type, regardless of its frequency.
Abstract: There is disclosed a tone type recognition method capable of recognizing a call progress state of a central office line switching system by using a tone detector. The method enables the system to correctly recognize the type of call progress tone, regardless of its frequency, by conducting periodic detection of characteristics of cadence classified by tone-type.
31 citations
Patent•
31 Mar 1992TL;DR: In this article, a method and apparatus for detecting dual-tone, multi-frequency (DTMF) digits and call progress tones by determining the amplitudes of preselected frequencies in a signal over a predetermined time period was presented.
Abstract: A method and apparatus for detecting dual-tone, multi-frequency (DTMF) digits and call progress tones by determining the amplitudes of preselected frequencies in a signal over a predetermined time period, and determining a candidate tone by selecting two of the preselected frequencies with the highest amplitudes and comparing the two selected frequencies to known DTMF and call progress tone frequencies. The amplitudes of the two selected frequencies are then tested against predefined thresholds corresponding to a candidate tone having the two selected frequencies. The candidate tone in the current time period is tested against candidate tones in previous time periods for consistency. If the candidate tone is a DTMF digit and passed all of the tests, then the DTMF digit is returned. If the candidate tone is a call progress tone, the pattern of the candidate tone over a plurality of predetermined time periods is recorded and tested against known patterns of the candidate tone. If the candidate tone meets all of the above tests, the call progress tone is returned.
26 citations
Patent•
28 Apr 1999TL;DR: In this paper, a system and apparatus for enabling communications devices to recognize call progress tones that may be used in foreign countries is presented, where the call progress tone detection system includes a communications device (50) having one or more frequency decoders (113), a cadence decoder (126), and a table (122) for storing the call progression tones frequencies and the cadences.
Abstract: A system and apparatus for enabling communications devices to recognize call progress tones that may be used in foreign countries. The call progress tone detection system includes a communications device (50) having one or more frequency decoders (113) for determining the frequency of call progress tones, a cadence decoder (126) for determining the on/off pattern for the call progress tones and a table (122) for storing the call progress tone frequencies and the cadences. Recognition of call progress tones is accomplished by enabling the communications device (50) to receive one or more foreign call progress tones, enabling the user to associate the type of call progress tone for each call progress tone received and storing each call progress tone to a table (122) for later cross reference when initiating a call.
24 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2009 | 1 |
| 2008 | 1 |
| 2007 | 1 |
| 2006 | 2 |
| 2004 | 1 |
| 2002 | 3 |