Code conversion method and device
AssigneeNEC Corporation
InventorAtsushi Murashima
Life of this patent
Estimating the term…
Abstract
A code conversion method for converting first code string data conforming to a first speech coding scheme into second code string data conforming to a second speech coding scheme has the steps of decoding the first code string data to generate a first decoded speech, correcting the signal characteristics of the first decoded speech to generate a second decoded speech, and encoding the second decoded speech in accordance with the second speech coding scheme to generate the second code string data.
Claims27
A code conversion method for converting first code string data conforming to a first speech coding scheme into second code string data conforming to a second speech coding scheme, the method comprising the steps of:
- decoding the first code string data to generate a first decoded speech;
- correcting signal characteristics of the first decoded speech to generate a second decoded speech;
- and
- encoding the second decoded speech in accordance with the second speech coding scheme to generate the second code string data.
A code conversion apparatus for converting first code string data conforming to a first speech coding scheme into second code string data conforming to a second speech coding scheme, the apparatus comprising:
- a speech decoding circuit for decoding the first code string data to generate a first decoded speech;
- a signal characteristic correcting circuit for correcting signal characteristics of the first decoded speech to generate a second decoded speech;
- and
- a speech encoding circuit for encoding the second decoded speech in accordance with the second speech coding scheme to generate the second code string data.
A program for causing a computer to execute the steps of:
- decoding a first code string data conforming to a first speech coding scheme to generate a first decoded speech;
- correcting signal characteristics of the first decoded speech to generate a second decoded speech;
- and
- encoding the second decoded speech in accordance with a second speech coding scheme to generate a second code string data conforming to the second speech coding scheme.
A program for causing a computer to execute the steps of:
- decoding a first code string data conforming to a first speech coding scheme to generate a first decoded speech;
- correcting signal characteristics of the first decoded speech using a filter having characteristics which vary in accordance with characteristics of the first decoded speech to generate a second decoded speech;
- and
- encoding the second decoded speech in accordance with a second speech coding scheme to generate a second code string data conforming to the second speech coding scheme.
A program for causing a computer to execute the steps of:
- decoding a first code string data conforming to a first speech coding scheme to generate a first decoded speech;
- correcting signal characteristics of the first decoded speech into signal characteristics suitable for re-encoding to generate a second decoded speech;
- and
- encoding the second decoded speech in accordance with a second speech coding scheme to generate the second code string data conforming to the second speech coding scheme.
A program for causing a computer to execute the steps of:
- decoding a first code string data conforming to a first speech coding scheme to generate a first decoded speech;
- correcting signal characteristics of the first decoded speech into signal characteristics suitable for re-encoding, using a filter having characteristics which vary in accordance with characteristics of the first decoded speech, to generate a second decoded speech signal;
- and
- encoding the second decoded speech in accordance with a second speech coding scheme to generate the second code string data conforming to the second speech coding scheme.
A program for causing a computer to execute the steps of:
- decoding a first code string data conforming to a first speech coding scheme to generate a first decoded speech;
- correcting signal characteristics of the first decoded speech into signal characteristics suitable for re-encoding, using a filter having characteristics which vary in accordance with characteristics of the first decoded speech, to generate a second decoded speech signal;
- encoding the second decoded speech in accordance with a second speech coding scheme to generate the second code string data conforming to the second speech coding scheme;
- and
- varying the characteristics of the filter using at least one of frame type information included in the first code string data, size of the first code string data, and a characteristic amount which can be calculated from the first decoded speech.
Dependencies are inferred from the claim text.