Apparatus for coding of variable bitrate wideband speech and audio signals, and a method thereof
First Claim
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1. An apparatus for coding of variable bitrate wideband speech and audio, comprising:
- a) a speech and audio divider for dividing signals inputted to a CODEC into speech or audio signals;
b) a narrowband coder for performing narrowband coding when the divided input signals are speech signals;
c) a bitrate modifier for decreasing a bitrate for coding of a low frequency band and increasing a bitrate for coding of a high frequency band by the amount decreased in the low frequency band when the divided input signals are audio signals; and
d) a wideband coder for performing coding by the modified bitrate in the bitrate modifier.
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Abstract
An apparatus for coding of variable bitrate wideband speech and audio is described. The apparatus utilizes: a) a speech and audio divider for dividing signals inputted to a CODEC into speech or audio signals; b) a narrowband coder for performing narrowband coding, in the case the divided input signals are speech signals; c) a bitrate modifier for modifying a bitrate for coding of low frequency band and a bitrate for coding of a high frequency band, in the case the divided input signals are audio signals; and d) a wideband coder for performing coding by the modified bitrate in the bitrate modifier.
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Citations
8 Claims
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1. An apparatus for coding of variable bitrate wideband speech and audio, comprising:
- a) a speech and audio divider for dividing signals inputted to a CODEC into speech or audio signals;
b) a narrowband coder for performing narrowband coding when the divided input signals are speech signals;
c) a bitrate modifier for decreasing a bitrate for coding of a low frequency band and increasing a bitrate for coding of a high frequency band by the amount decreased in the low frequency band when the divided input signals are audio signals; and
d) a wideband coder for performing coding by the modified bitrate in the bitrate modifier. - View Dependent Claims (2, 3)
- a) a speech and audio divider for dividing signals inputted to a CODEC into speech or audio signals;
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4. A method for coding of variable bitrate wideband speech and audio comprising:
- i) determining input signals inputted to a CODEC and dividing the input signals into speech or audio signals;
ii) assigning bits to a low frequency band and performing coding in the case the divided input signals are speech signals;
iii) modifying a bitrate by decreasing a bitrate for coding of a low frequency band and increasing a bitrate for coding of a high frequency band by the amount decreased in the low frequency band when the divided input signals are audio signals; and
iv) assigning bits to the low frequency band and the high frequency band by the modified bitrate and performing coding. - View Dependent Claims (5, 6, 7)
- i) determining input signals inputted to a CODEC and dividing the input signals into speech or audio signals;
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8. A recording medium for storing a program readable by a computer, the program performing coding of variable bitrate wideband speech and audio, the program comprising:
- i) determining input signals inputted to a CODEC and dividing the input signals into speech or audio signals;
ii) assigning bits to a low frequency band and performing coding when the divided input signals are speech signals;
iii) modifying a bitrate by decreasing a bitrate for coding of a low frequency band and increasing a bitrate for coding of a high frequency band by the amount decreased in the low frequency band when the divided input signals are audio signals; and
iv) assigning bits to the low frequency band and the high frequency band by the modified bitrate and performing coding.
- i) determining input signals inputted to a CODEC and dividing the input signals into speech or audio signals;
Specification