Information storage apparatus

• US 5,608,759 A
• Filed: 06/29/1994
• Issued: 03/04/1997
• Est. Priority Date: 07/02/1993
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Fujiwara, Naoto
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): Corrielus, Jean B.
• Application Number:
  US08/267,388
• Time in Patent Office: 979 Days
• Field of Search: 375/240, 375/241, 375/242, 341/78, 341/88, 341/89, 341/106, 341/55
• US Class Current: 375/242
• CPC Class Codes: H04Q 11/0421 Circuit arrangements therefor
• CPC Class Codes: H04W 4/18 Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals

Abstract

In a digital communication network in which pieces of information having different PCM coding rules are present, an information storage apparatus includes a control unit, a storage unit, and at least one transconverter. The control unit includes a comparator which compares the coding rule identifier read from the storage unit with a coding rule identifier of the read destination, when the control unit receives the information read request signal transmitted with the coding rule identifier of the read destination, so that if the coding rule identifier read out from the storage unit coincides with the coding rule identifier of the read destination, the PCM-coded information read out from the storage unit is transmitted without code conversion, and if the coding rule identifier read out from the storage unit does not coincide with the coding rule identifier, the PCM-coded information is transmitted through a selected transconverter to produce code-converted PCM-coded information.

Claims

1. In a digital communication network in which pieces of audio information are encoded using different PCM coding rules,

an information storage apparatus comprising:

a control means for receiving an information storage request signal with a coding rule identifier of a source and an information read request signal transmitted with a coding rule identifier of a read destination;

a storage unit for storing PCM-coded audio information to be transmitted and a coding rule identifier of the PCM-coded audio information in correspondence with each other, when said control means receives the information storage request signal; and

at least one transconverter for respectively converting PCM-coded audio information read from said storage unit into code-converted PCM-coded audio information having a same coding rule as the coding rule of the read destination;

said control means including a comparator which compares the coding rule identifier read from said storage unit with the coding rule identifier of the read destination, when said control means receives the information read request signal transmitted along with the coding rule identifier of the read destination, so that if the coding rule identifier read from said storage unit coincides with the coding rule identifier of the read destination, the PCM-coded audio information read from said storage unit is transmitted without code conversion, and if the coding rule identifier read from said storage unit does not coincide with the coding rule identifier of the read destination, said PCM-coded audio information is transmitted through a selected one of said at least one transconverter to convert said PCM-coded audio information into said code-converted PCM-coded audio information.

2. An apparatus according to claim 1, further comprising a compression unit and an expansion unit whereby, when a PCM-coded audio information received through a channel includes redundant data, said compression unit removes the redundant data to produce compressed audio data which is stored in said storage unit, and the compressed audio data read out from said storage unit is expanded by the expansion unit and output.

3. In a digital communication network in which pieces of audio information are encoded using different PCM coding rules are present,

an information storage apparatus comprising:

a control means for receiving an information storage request signal with a coding rule identifier of the source and an information read request signal transmitted with a coding rule identifier of a read destination;

a storage unit for storing PCM-coded audio information to be transmitted and a coding rule identifier of the PCM-coded audio information in correspondence with each other, when said control means receives the information storage request signal;

a plurality of transconverters for respectively converting PCM-coded audio information read from said storage unit into code-converted PCM-coded audio information having a same coding rule as the coding rule of the read destination; and

a selection unit for selecting one of said plurality of transconverters under control of said control means;

said control means including a comparator which compares the coding rule identifier read from said storage unit with the coding rule identifier of the read destination, when said control means receives the information read request signal transmitted along with the coding rule identifier of the read destination, so that if the coding rule identifier read from said storage unit coincides with the coding rule identifier of the read destination, the PCM-coded audio information read from said storage unit is transmitted without code conversion, and if the coding rule identifier read from said storage unit does not coincide with the coding rule identifier of the read destination, said PCM-coded audio information is transmitted through said selected one of said plurality of transconverters to convert said PCM-coded audio information into said code-converted PCM-coded audio information.

4. An apparatus according to claim 3, further comprising a compression unit and a expansion unit whereby, when a PCM-coded audio information received through a channel includes redundant data, said compression unit removes the redundant data to produce compressed audio data which is stored in said storage unit, and the compressed audio data read out from said storage unit is expanded by the expansion unit and output.