Voice communications system
First Claim
1. A voice communications apparatus selectively connectable to a general subscriber telephone set and a broadband telephone set, said apparatus being interposed in communication between the connected telephone set and a public switched telephone network, said apparatus comprising:
- a circuit for determining a class of the connected telephone set; and
a circuit for changing at least a sampling frequency in sampling an analog signal from the connected telephone set, depending on the determined class of the connected telephone set.
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Accused Products
Abstract
Voice communications apparatus is connected to a general subscriber telephone set or a broadband telephone set, to communicate over the public switched telephone network. The apparatus includes a filter converting signals such as to satisfy signal conditions prescribed for the telephone network. The apparatus also includes a terminal class determiner for determining the class of the telephone set connected, and a circuit for changing at least the sampling frequency at which the analog signals from the telephone set are sampled. This establishes high quality in broadband voice communications. The terminal class determiner may automatically determine the class of the telephone set at any timing of a call sequence by detecting a band component of the signals from the telephone set, a predetermined frequency of a signal intermittently transmitted from the telephone set or the characteristics of the telephone set.
10 Citations
23 Claims
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1. A voice communications apparatus selectively connectable to a general subscriber telephone set and a broadband telephone set, said apparatus being interposed in communication between the connected telephone set and a public switched telephone network, said apparatus comprising:
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a circuit for determining a class of the connected telephone set; and a circuit for changing at least a sampling frequency in sampling an analog signal from the connected telephone set, depending on the determined class of the connected telephone set.
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2. A voice communications apparatus comprising:
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a telephone circuit for setting up a call selectively over one of a broadband network and a public switched telephone network; a first circuit for determining over which of the broadband network and the public switched telephone network a call is to be established; and a second circuit for changing at least a sampling frequency in sampling an analog signal from said telephone circuit, depending on a determination made by said first circuit.
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3. A telephone set connectable to a network selected from the group consisting of a public switched telephone network and a broadband communications network, said telephone set comprising:
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a determining circuit for receiving from the network a signal and determining whether the network is the public switched telephone network or the broadband communications network based on the signal; and a band limiter, responsive to said determining circuit having determined that the network is the public switched telephone network, for limiting a communication band of the signal transmitted at least toward the public switched telephone network to an acceptable band of the public switched telephone network. - View Dependent Claims (4, 5)
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6. A voice communications system comprising:
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a particular telephone set selected from the group consisting of a general subscriber telephone set and a broadband telephone set, and a voice communications apparatus interposed in communication between said particular telephone set and at least one of a public switched telephone network and a broadband communications network, wherein said voice communications apparatus includes a circuit for sending out to said telephone set a signal by which what sort of network a particular one of the at least one networks is can be determined, and wherein said particular telephone set includes a determining circuit for receiving the sent-out signal and for determining which of the public switched telephone network and the broadband communications network the particular network is, based on the received signal; and wherein said particular telephone set additionally includes a band limiter, responsive to said determining circuit having determined that the particular network is the public switched telephone network, for limiting a communication band of the signal transmitted at least toward the public switched telephone network to an acceptable band of the public switched telephone network. - View Dependent Claims (7)
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8. A voice communications system comprising:
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a particular telephone set selected from the group consisting of a general subscriber telephone set and a broadband telephone set, and a voice communications apparatus interposed in communication between said particular telephone set and at least one of a public switched telephone network and a broadband communications network, wherein said voice communications apparatus includes; a first circuit for determining a class of said particular telephone set; and a second circuit, operative in response to the class determined, for changing a property of an in-channel signal transmitted between said particular telephone set and said voice communications apparatus. - View Dependent Claims (9, 10, 11)
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12. A voice communications system comprising:
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a particular telephone set selected from the group consisting of a general subscriber telephone set and a broadband telephone set; and a voice communications apparatus interconnected to said particular telephone set and interposed in communication between said particular telephone set and at least one of a public switched telephone network and a broadband communications network, wherein said voice communications apparatus includes; a first circuit for determining a class of said particular telephone set; and a second circuit for providing said particular telephone set with a change command for changing characteristics corresponding to the class determined, and wherein said particular telephone set includes a third circuit responsive to the change command for changing a property of an in-channel signal transmitted between said voice communications apparatus and said particular telephone set. - View Dependent Claims (13, 14)
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15. A telephone set connectable to a particular network selected from the group consisting of a public switched telephone network and a broadband communications network, said telephone set comprising:
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a determining circuit for determining, from a first signal by which what sort of network that the particular network is can be determined, whether the particular network is the public switched telephone network or the broadband communications network; and a band limiter, responsive to said determining circuit having determined that the particular network is the public switched telephone network, for limiting a communication band of a second signal transmitted at least toward the public switched telephone network to an acceptable band of the public switched telephone network. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A voice communications system comprising:
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a particular telephone set selected from the group consisting of a general subscriber telephone set and a broadband telephone set; and a voice communications apparatus interposed in communication between said particular telephone set and at least one of a public switched telephone network and a broadband communications network, wherein said voice communications apparatus includes a circuit for sending out to said particular telephone set a first signal, wherein said particular telephone set includes; a determining circuit for receiving the first signal and determining which of the public switched telephone network and the broadband communications network the particular telephone set is connected to, based on the received first signal; and a band limiter, responsive to said determining circuit having determined that the network to which the particular telephone set is connected is the public switched telephone network, for limiting a communication band of a second signal transmitted at least toward the public switched telephone network to an acceptable band of the public switched telephone network. - View Dependent Claims (22, 23)
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Specification