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    1.
    发明专利
    未知

    公开(公告)号：DE3679283D1

    公开(公告)日：1991-06-20

    申请号：DE3679283

    申请日：1986-08-26

    Applicant: IBM

    Inventor： EINKAUF MARK ALAN ,  WEST LYNN PARKER

    IPC: H04M1/60 ,  G10L11/00 ,  G10L11/02 ,  H04M1/65 ,  H04M3/42 ,  H04Q1/46 ,  G10L3/00

    Abstract: This invention enables voice energy to be distinguished from energy due to other sources such as telephone call progress signals. A portion of the audio spectrum is divided into a high and into a low frequency band and the energy content of these bands is examined. The audio energy of a signal is passed through a set of filters and compared. A frequency boundary crossing of an input signal subsequent to filtering is used to signify the receipt of a voice signal. By operating in this manner, voice, whose predominant frequency switches in a random fashion from being greater than to less than a cutoff frequency, can be distinguished from other signals either below or above the cutoff frequencies of the filters. The detection of voice energy is not begun until a predetermined threshold of energy has been received for a specified period of time. This specified period of time need not be continuous after a ringback signal is received. Subsequent to the receipt of a ringback signal, the voice detection mechanism will proceed as long as the total time above the threshold exceeds the specified time.

    4.
    发明专利
    未知

    公开(公告)号：BR8604618A

    公开(公告)日：1987-05-26

    申请号：BR8604618

    申请日：1986-09-25

    Applicant: IBM

    Inventor： EINKAUF MARK ALAN ,  WEST LYNN PARKER

    IPC: H04M1/60 ,  G10L11/00 ,  G10L11/02 ,  H04M1/65 ,  H04M3/42 ,  H04Q1/46 ,  H04B3/04

    Abstract: This invention enables voice energy to be distinguished from energy due to other sources such as telephone call progress signals. A portion of the audio spectrum is divided into a high and into a low frequency band and the energy content of these bands is examined. The audio energy of a signal is passed through a set of filters and compared. A frequency boundary crossing of an input signal subsequent to filtering is used to signify the receipt of a voice signal. By operating in this manner, voice, whose predominant frequency switches in a random fashion from being greater than to less than a cutoff frequency, can be distinguished from other signals either below or above the cutoff frequencies of the filters. The detection of voice energy is not begun until a predetermined threshold of energy has been received for a specified period of time. This specified period of time need not be continuous after a ringback signal is received. Subsequent to the receipt of a ringback signal, the voice detection mechanism will proceed as long as the total time above the threshold exceeds the specified time.

    6.
    发明专利
    未知

    公开(公告)号：BR8604619A

    公开(公告)日：1987-05-26

    申请号：BR8604619

    申请日：1986-09-25

    Applicant: IBM

    Inventor： EINKAUF MARK ALAN ,  PARKER PAUL EDWARD ,  WEST LYNN PARKER ,  WILSON JOHN HAYDEN ,  HOEGH BRENT THOMAS ,  MCDONALD BRADLEY SCOTT

    IPC: H04L29/10 ,  G06F13/00 ,  G06F13/38 ,  H04M11/00 ,  H04M11/06 ,  H04Q11/04

    Abstract: A communication interface for providing asynchronous and telephonic communications is disclosed. The interface enables software applications, which are independent of any hardware or physical addresses, to operate on the interface. In this manner, the software applications can be written independent of hardware implementation and protocol implementation. A set of configuration parameters is defined for both an asynchronous and telephonic communication function set. Additionally, a set of interrupt conditions is defined for both the asynchronous and telephonic communication function sets. These parameters and interrupt conditions control the interaction of the software applications across the interface with the system hardware. Means are provided for directing commands coming from a software application across the interface to the system hardware. Likewise, means are provided for generating interrupts and handling these interrupts from the system hardware across the interface back to an interrupt routine within the software application.

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