US20010041534A1 - Transmission system comprising at least a satellite station and a connection station, a station including a speech message correction device and a method of improving the quality of speech messages - Google Patents

Transmission system comprising at least a satellite station and a connection station, a station including a speech message correction device and a method of improving the quality of speech messages Download PDF

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Publication number
US20010041534A1
US20010041534A1 US09/207,531 US20753198A US2001041534A1 US 20010041534 A1 US20010041534 A1 US 20010041534A1 US 20753198 A US20753198 A US 20753198A US 2001041534 A1 US2001041534 A1 US 2001041534A1
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Prior art keywords
speech
station
correction device
message correction
frames
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US09/207,531
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US6370366B2 (en
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Pierre Roullet
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US Philips Corp
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US Philips Corp
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Assigned to U.S. PHILIPS CORPORATION reassignment U.S. PHILIPS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ROULLET, PIERRE
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/001—Digital control of analog signals

Definitions

  • the present invention relates to a transmission system comprising at least a satellite station and a connection station for connecting the system to a switched network, in which system at least one of said stations includes means for receiving speech messages transmitted in frames and a speech message correction device for modifying the speech signal frames as a function of the quality of the transmission.
  • the invention likewise relates to a station suitable for such a system, which station includes a speech message correction device for modifying the speech signal frames as a function of the quality of the transmission.
  • the invention also relates to a method of improving the quality of speech messages.
  • the invention finds interesting applications in the domain of portable radio telephones complying with the GSM and other standards (DCS . . . etc.).
  • the present invention proposes a system of the type defined in the opening paragraph, which certainly still more improves the quality of the messages received in poor transmission conditions.
  • the speech message correction device includes a counter of bad frames, an attenuation circuit for diminishing the amplitude of the speech signals for a count of said counter that is higher than a predetermined value.
  • FIG. 1 shows a system in accordance with the invention
  • FIG. 2 shows a satellite station in accordance with the invention
  • FIG. 3 shows a connection station in accordance with the invention
  • FIG. 4 shows a flow chart representing the steps of the method implemented in accordance with the invention.
  • FIG. 1 shows in a diagram a system in accordance with the invention.
  • This system complying with the GSM standards and shown in this FIG. 1, is formed by a base or connection station B 1 and by a plurality of satellite stations which are mobiles or not M 1 , M 2 , . . . . Only the stations M 1 and M 2 are shown in the Figure.
  • the connection station B 1 permits of the exchange of data between the satellite stations which are located in its coverage area Z 1 , on the one hand, and also of the exchange of data with subscribers (for example, subscriber A 1 ) who belong to the normal switched network via a switching center SW, on the other hand.
  • FIG. 2 shows in a diagram a satellite station in accordance with the invention. Only the receiving part is shown, any detail concerning the structure of such a station may be found in cited U.S. Pat. No. 5,687,184.
  • the speech data are transported by waves captured by an antenna 10 connected to a receiving circuit 12 followed by a channel decoder 14 which supplies data to a speech message correction device 16 .
  • the output signals of the device are applied to a sound signal restoring circuit 18 formed, inter alia, by an amplified listening loudspeaker.
  • FIG. 3 shows in a diagram a connection station in accordance with the invention. Only the receiving part is shown, any detail concerning the structure of such a station may be found in cited U.S. Pat. No. 5,687,184.
  • This station includes the elements 20 , 22 , 24 , 26 and 28 comparable to the respective elements 10 , 12 , 14 , 16 and 18 of the satellite station of FIG. 1.
  • the element 28 produces only analog signals on its output and does not produce sound waves as the circuit 18 does.
  • a controller 30 establishes a path to the switch of the switched network SW if need be.
  • the channel decoders 14 and 24 produce signals by means of which it is possible to determine the bad frames and, if it is necessary, to carry out a process so that the signals returned to the subscribers and to the users are not too annoying when the transmissions are poor, notably sound fragments which give an impression of “chopped words” which are highly annoying to hear.
  • the devices 16 and 26 include a counter 34 and 36 respectively, for counting the number of bad frames and means for attenuating the sound signals when this number exceeds a certain value, for example, 4.
  • FIG. 4 explains the implementation of the invention by means of a flow chart.
  • box KO shows the reception of a frame.
  • K 1 is a test carried out with the signals produced by the channel decoder 14 , 24 in view of determining whether the received frame is a good or a bad frame; if it is a good frame, box K 2 is proceeded to where the contents CBD of the counter of bad frames 34 , 36 is set to zero. If the frame is bad, the contents of this counter are incremented by unity, box K 4 . Then, in box K 6 , the contents CBD are tested.
  • an incrementation step STP is set to 6 (box K 10 ), if not, the value is set to 0 (box K 8 ).
  • the value of the amplitude of the signals to be applied to the speech restoration circuit assumes the value indicated in box K 12 :
  • i is the number of the sub-sequences
  • X max [i] is the amplitude of the sub-sequences.

Abstract

This system, in which the speech signals are conveyed in frames, is formed by a plurality of satellite stations (M1, M2, . . . ) and a connection station (B1) for permitting data exchanges over telephone lines via a switch (SW). To remedy the unwanted effects of poor transmissions, there is proposed to attenuate the speech signals when the signal frames are declared to be bad frames.
Application to GSM and DCS networks.

Description

    FIELD OF THE INVENTION
  • The present invention relates to a transmission system comprising at least a satellite station and a connection station for connecting the system to a switched network, in which system at least one of said stations includes means for receiving speech messages transmitted in frames and a speech message correction device for modifying the speech signal frames as a function of the quality of the transmission. [0001]
  • The invention likewise relates to a station suitable for such a system, which station includes a speech message correction device for modifying the speech signal frames as a function of the quality of the transmission. [0002]
  • The invention also relates to a method of improving the quality of speech messages. [0003]
  • The invention finds interesting applications in the domain of portable radio telephones complying with the GSM and other standards (DCS . . . etc.). [0004]
    • BACKGROUND OF THE INVENTION
  • Such a system is known from U.S. Pat. No. 5,687,184 in which at least one of the stations includes a message correction device which already notably improves the quality of the messages heard. [0005]
    • SUMMARY OF THE INVENTION
  • The present invention proposes a system of the type defined in the opening paragraph, which certainly still more improves the quality of the messages received in poor transmission conditions. [0006]
  • For this purpose, such a system is characterized in that the speech message correction device includes a counter of bad frames, an attenuation circuit for diminishing the amplitude of the speech signals for a count of said counter that is higher than a predetermined value.[0007]
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter. [0008]
  • In the drawings: [0009]
  • FIG. 1 shows a system in accordance with the invention, [0010]
  • FIG. 2 shows a satellite station in accordance with the invention, [0011]
  • FIG. 3 shows a connection station in accordance with the invention, and [0012]
  • FIG. 4 shows a flow chart representing the steps of the method implemented in accordance with the invention.[0013]
    • DESCRIPTION OF PREFERRED EMBODIMENTS
  • FIG. 1 shows in a diagram a system in accordance with the invention. This system, complying with the GSM standards and shown in this FIG. 1, is formed by a base or connection station B[0014] 1 and by a plurality of satellite stations which are mobiles or not M1, M2, . . . . Only the stations M1 and M2 are shown in the Figure. The connection station B1 permits of the exchange of data between the satellite stations which are located in its coverage area Z1, on the one hand, and also of the exchange of data with subscribers (for example, subscriber A1) who belong to the normal switched network via a switching center SW, on the other hand.
  • FIG. 2 shows in a diagram a satellite station in accordance with the invention. Only the receiving part is shown, any detail concerning the structure of such a station may be found in cited U.S. Pat. No. 5,687,184. The speech data are transported by waves captured by an [0015] antenna 10 connected to a receiving circuit 12 followed by a channel decoder 14 which supplies data to a speech message correction device 16. The output signals of the device are applied to a sound signal restoring circuit 18 formed, inter alia, by an amplified listening loudspeaker.
  • FIG. 3 shows in a diagram a connection station in accordance with the invention. Only the receiving part is shown, any detail concerning the structure of such a station may be found in cited U.S. Pat. No. 5,687,184. This station includes the [0016] elements 20, 22, 24, 26 and 28 comparable to the respective elements 10, 12, 14, 16 and 18 of the satellite station of FIG. 1. The element 28, however, produces only analog signals on its output and does not produce sound waves as the circuit 18 does. A controller 30 establishes a path to the switch of the switched network SW if need be.
  • The [0017] channel decoders 14 and 24 produce signals by means of which it is possible to determine the bad frames and, if it is necessary, to carry out a process so that the signals returned to the subscribers and to the users are not too annoying when the transmissions are poor, notably sound fragments which give an impression of “chopped words” which are highly annoying to hear.
  • According to the invention, the [0018] devices 16 and 26 include a counter 34 and 36 respectively, for counting the number of bad frames and means for attenuating the sound signals when this number exceeds a certain value, for example, 4.
  • FIG. 4 explains the implementation of the invention by means of a flow chart. In this flow chart, box KO shows the reception of a frame. K[0019] 1 is a test carried out with the signals produced by the channel decoder 14, 24 in view of determining whether the received frame is a good or a bad frame; if it is a good frame, box K2 is proceeded to where the contents CBD of the counter of bad frames 34, 36 is set to zero. If the frame is bad, the contents of this counter are incremented by unity, box K4. Then, in box K6, the contents CBD are tested. If they exceed a certain count, in this example 4, then an incrementation step STP is set to 6 (box K10), if not, the value is set to 0 (box K8). Thus the value of the amplitude of the signals to be applied to the speech restoration circuit assumes the value indicated in box K12:
  • X max [i]=MAX(X max [i]−stp), for i=1, . . . 4,
  • i is the number of the sub-sequences, [0020]
  • X[0021] max[i] is the amplitude of the sub-sequences.
  • All these values are explained or defined in the standard ETS 300-961. [0022]
  • Thus, by means of the measures proposed by the invention there is avoided that silence samples are inserted too abruptly when the transmission becomes too bad. [0023]

Claims (4)

1. A transmission system comprising at least a satellite station and a connection station for connecting the system to a switched network, in which system at least one of said stations includes means for receiving speech messages transmitted in frames and a speech message correction device for modifying the speech signal frames as a function of the quality of the transmission, which system is characterized in that the speech message correction device includes a counter of bad frames, an attenuation circuit for diminishing the amplitude of the speech signals for a count of said counter that is higher than a predetermined value.
2. A satellite station suitable for a system as claimed in
claim 1
, including a message correction device, characterized in that the speech message correction device has a counter for counting bad frames, an attenuation circuit for diminishing the amplitude of the speech signals for a count of said counter that is higher than a predetermined value.
3. A connection station suitable for a system as claimed in
claim 1
, including a message correction device, characterized in that the speech message correction device includes a counter for counting bad frames, an attenuation circuit for diminishing the amplitude of the speech signals for a count of said counter that is higher than a predetermined value.
4. A method of improving the quality of the speech messages implemented in a system as claimed in
claim 1
 or in a station as claimed in
claim 2
 or
3
, characterized in that it comprises the following steps:
counting of bad frames,
diminishing the signals when the count of bad frames exceeds a predetermined value.
US09/207,531 1997-12-15 1998-12-08 Telephony device comprising a base station and at least a subscriber unit, subscriber unit for such a telephony device and method used in such a telephony device Expired - Fee Related US6370366B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9715880 1997-12-15
FR9715880 1997-12-15

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US20010041534A1 true US20010041534A1 (en) 2001-11-15
US6370366B2 US6370366B2 (en) 2002-04-09

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US (1) US6370366B2 (en)
EP (1) EP0924866A1 (en)
JP (1) JPH11284558A (en)
KR (1) KR19990063041A (en)
CN (1) CN1179511C (en)
TW (1) TW409465B (en)

Cited By (1)

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US20020150069A1 (en) * 1999-07-21 2002-10-17 Yu-Cheun Jou Mobile station supervision of the forward dedicated control channel when in the discontinuous transmission mode

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US6892336B1 (en) * 2000-03-17 2005-05-10 Applied Micro Circuits Corporation Gigabit ethernet performance monitoring
US6721541B1 (en) * 2000-04-17 2004-04-13 Agilent Technologies, Inc. Wireless telephone testing using an echo plug
US8165224B2 (en) * 2007-03-22 2012-04-24 Research In Motion Limited Device and method for improved lost frame concealment
US8699723B2 (en) 2010-07-20 2014-04-15 International Business Machines Corporation Audio device volume manager using measured volume perceived at a first audio device to control volume generation by a second audio device

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US4422171A (en) * 1980-12-29 1983-12-20 Allied Corporation, Law Department Method and system for data communication
US4590468A (en) * 1983-03-10 1986-05-20 Western Digital Corporation Token access controller protocol and architecture
US5309443A (en) * 1992-06-04 1994-05-03 Motorola, Inc. Dynamic muting method for ADPCM coded speech
DE4335305A1 (en) 1993-10-16 1995-04-20 Philips Patentverwaltung Method and circuit arrangement for transmitting voice signals
US6088590A (en) 1993-11-01 2000-07-11 Omnipoint Corporation Method and system for mobile controlled handoff and link maintenance in spread spectrum communication
US5621772A (en) * 1995-01-20 1997-04-15 Lsi Logic Corporation Hysteretic synchronization system for MPEG audio frame decoder
SE9500858L (en) * 1995-03-10 1996-09-11 Ericsson Telefon Ab L M Device and method of voice transmission and a telecommunication system comprising such device
US5778030A (en) * 1996-03-15 1998-07-07 Motorola, Inc. Method and apparatus for power control in a communication system
US6009389A (en) * 1997-11-14 1999-12-28 Cirrus Logic, Inc. Dual processor audio decoder and methods with sustained data pipelining during error conditions
US5995827A (en) * 1997-11-20 1999-11-30 Lucent Technologies Inc. Method of muting a non-speaking cellular telephone caller participating in a conference call
US6097772A (en) * 1997-11-24 2000-08-01 Ericsson Inc. System and method for detecting speech transmissions in the presence of control signaling
US6058107A (en) * 1998-04-08 2000-05-02 Motorola, Inc. Method for updating forward power control in a communication system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020150069A1 (en) * 1999-07-21 2002-10-17 Yu-Cheun Jou Mobile station supervision of the forward dedicated control channel when in the discontinuous transmission mode
US7881256B2 (en) * 1999-07-21 2011-02-01 Qualcomm, Incorporated Mobile station supervision of the forward dedicated control channel when in the discontinuous transmission mode

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US6370366B2 (en) 2002-04-09
EP0924866A1 (en) 1999-06-23
JPH11284558A (en) 1999-10-15
CN1227992A (en) 1999-09-08
TW409465B (en) 2000-10-21
CN1179511C (en) 2004-12-08
KR19990063041A (en) 1999-07-26

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Owner name: U.S. PHILIPS CORPORATION, NEW YORK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ROULLET, PIERRE;REEL/FRAME:009742/0124

Effective date: 19990104

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STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

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Effective date: 20060409