EP0082333A1
Expired / Lapsed
EP
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Interleaved digital data and voice communications system and method
Assignee: International Business Machines Corp
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Filing: 1982-11-23
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Granted: —
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Expires: 2002-11-23
Abstract
Abstract Digital data is inserted in quiet or "no speech" portions of the PCM encoded voice signal stream when such quiet periods are detected. The digital data is encoded in a two byte pattern in which the scaling bits (VUT) are set high and the sign bit (S) alternates in each eight bit byte. Four bits of each byte are thus reserved for scaling and sign purposes, but the remaining four bits (d7-d4 and d3-d0) are available for data transmission. Setting the three PCM scaling bits high and alternating the sign bit has the effect of indicating to the receiver that voice is not present. Recognition of such a signal by the receiver permits a detector to block the output at a speech terminal and to strip the scale bits from the input two byte patterns and pass the remaining bits as data to a data output.
Inventors
- 👤 Gardner Dulaney Jones, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 22:42
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/06; H04M11/064; H04J; H04J3/00; H04J3/02; H04J3/12; H04J3/125; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
104 words
A method of interleaving digital data signals and PCM encoded voice signals in a communications system, characterized in that it comprises : a first step of detecting a quiet period in the PCM encoded voice signals to be transmitted; a second step responsive.to said first step of generating a violation code pattern of bits not allowed in the PCM coded format for voice -signals; a third step of combining said violation code pattern with digital data bits'to be transmitted; and a fourth step of applying the combined violation code pattern and digital data bits to an output port for transmission on a communications link.
Claim 2
Independent Claim
104 words
A method of interleaving digital data signals and PCM encoded voice signals in a communications system, characterized in that it comprises : a first step of detecting a quiet period in the PCM encoded voice signals to be transmitted; a second step responsive.to said first step of generating a violation code pattern of bits not allowed in the PCM coded format for voice -signals; a third step of combining said violation code pattern with digital data bits'to be transmitted; and a fourth step of applying the combined violation code pattern and digital data bits to an output port for transmission on a communications link.
Claim 3
Dependent Claim
34 words
The method of claim 1, characterized in that said second step comprises the sub-steps of generating a violation code pattern of scaling bits not allowed in PCM coded format and alternating the sign bit.
Claim 4
Dependent Claim
31 words
The method as described in claim 2, characterized in that said combining step further comprises : combining said violation code pattern with digital data bits for transmission in a two-byte format.
Claim 5
Independent Claim
61 words
The method as described in any one of the preceding claims, characterized in that it further comprises the steps of : receiving incoming digital bit stream signals at a receiver; detecting the presence of said violation code pattern; and responsive to said detection of a violation code pattern, interrupting output of digital voice codes and initiating output of digital data 'codes.
Claim 6
Dependent Claim
36 words
The method as described in claim 4, characterized in that comprises the steps of : removing said violation code pattern from said incoming signal stream and grouping data bits which remain together into bytes for output.
Claim 7
Dependent Claim
198 words
An interleaved digitized voice and data communications system, comprising a digitized data and voice transmitter and a digitized data and voice receiver, and a communications link connecting said transmitter and said receiver; said transmitter comprising a voice input and a data input, characterized in that said transmitter comprises : means for detecting a quiet period in the voice signals, said detecting means being connected to said voice input; controlling means responsive to the detection of a quiet period in the voice signals by said detecting means and connected to said detecting means for controlling the admission of data signals from said data input into said transmitter and for connecting said voice or data signals, respectively, to said communications link; a digital bit pattern generator means for generating a violation digital pattern code not permitted as a normal voice signal code; encoding means connected to said digital bit pattern generator and to said data input for encoding a combined digital violation and'data pattern having at least one scaling bit altered to a condition not allowed for voice transmission; and means for supplying said encoded patterns to said controlling means, said controlling means applying said patterns to said communication link.
Claim 8
Dependent Claim
198 words
An interleaved digitized voice and data communications system, comprising a digitized data and voice transmitter and a digitized data and voice receiver, and a communications link connecting said transmitter and said receiver; said transmitter comprising a voice input and a data input, characterized in that said transmitter comprises : means for detecting a quiet period in the voice signals, said detecting means being connected to said voice input; controlling means responsive to the detection of a quiet period in the voice signals by said detecting means and connected to said detecting means for controlling the admission of data signals from said data input into said transmitter and for connecting said voice or data signals, respectively, to said communications link; a digital bit pattern generator means for generating a violation digital pattern code not permitted as a normal voice signal code; encoding means connected to said digital bit pattern generator and to said data input for encoding a combined digital violation and'data pattern having at least one scaling bit altered to a condition not allowed for voice transmission; and means for supplying said encoded patterns to said controlling means, said controlling means applying said patterns to said communication link.
Claim 9
Dependent Claim
60 words
The system as described in claim 6, characterized in that said encoding means encodes a combined digital violation and data pattern of two bytes in length for each byte of data received, said two byte pattern having an alternating sign bit in each byte and having scaling bits in each byte altered to a condition not allowed for voice transmission.
Claim 10
Dependent Claim
53 words
The system as described in claim 6, characterized in that it further comprises : a clear to send output signal line connected to said means for detecting a quiet period in the voice signals for initiating release of data bit information from a data source connected to said data input of said transmitter.
Claim 11
Independent Claim
170 words
The system as described in any one of claims 6 to 8, characterized in that said digital data and voice receiver comprises : a communications link input connection to said receiver and a digital voice output port and a digital data output port therefrom; digital violation pattern detecting means connected to said input and a selector means connected to said input; said selector means being connected to said violation pattern detecting means and responsive to an indication therefrom that no violation pattern exists for applying the signals from said input connection to said digital voice output and responsive to an indication of the presence of a violation pattern therefrom for blocking any signal application to said digital voice output; and _data byte decoder means connected to said violation pattern detecting means and to said digital data output for removing said violation pattern from said combined digital violation and data patterns and applying a digital data byte at said output for each combined digital data and encoded pattern input supplied thereto.
Claim 12
Dependent Claim
40 words
The system as described in claim 9, characterized in that it comprises : a received data output signal indicator connected to said detecting means at said receiver for indicating to a data sink the initiation or termination of data reception.
References Cited (Backward Citations)
GB1021927A
Cited
EP0003009A2
Cited
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