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US 8,576,096 B2Granted
Apparatus and method for low complexity combinatorial coding of signals
AssigneeMotorola Mobility LLC
InventorsUdar Mittal, James P. Ashley
Life of this patent
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Abstract
During operation of an encoder, a signal vector (x) is received. A first multi-precision operand (Ψ′k) will be generated based on the signal vector to be encoded. A mantissa operand and an exponent operand are generated. Both the mantissa operand and the exponent operand are representative of a second multi-precision operand that is based on the signal vector to be encoded. A portion of Ψ′k is selected to be modified based on the exponent operand. A part of Ψ′k is modified based on the mantissa operand to produce a modified multi-precision operand (Ψ′k+1). Finally, a multi-precision codeword is generated for use in a corresponding decoder.
Claims20
A method for operating an encoder that produces a codeword (C) from an input vector (x), the method comprising the steps of:
- receiving, by a vector generator of the encoder, an input signal;
- creating, by the vector generator, the input vector;
- receiving, by a combinational coding circuitry of the encoder, the input vector to be encoded, wherein the input vector comprises speech, audio, image, or video signals;
- generating, by the combinational coding circuitry of the encoder, a first multi-precision operand (Ψ′k) based on the input vector;
- generating, by the combinational coding circuitry, a mantissa operand (M) and an exponent operand (h), wherein the mantissa operand and the exponent operand are representative of a second multi-precision operand (F′(pk,k)) that is based on the signal vector to be encoded;
- selecting, by the combinational coding circuitry, a portion of the first multi-precision operand to be modified based on the exponent operand;
- modifying, by the combinational coding circuitry, the portion of the first multi-precision operand based on the mantissa operand to produce a modified multi-precision operand (Ψ′k+1);
- and
- generating, by the combinational coding circuitry, the codeword (C) based on the modified multi-precision operand;
- wherein the codeword is for use by the encoder to encode the speech, audio, image, or video signals and by a corresponding decoder to decode the speech, audio, image, or video signals.
7 more elements
An encoder comprising:
- a vector generator creating an input vector x from a received input signal;
- combinatorial coding circuitry to generate a codeword (C) wherein the combinational coding circuitry performing the steps of:
- receiving the input vector x to be encoded, wherein the vector x comprises speech, audio, image, or video signals;
- generating a first multi-precision operand (Ψ′k) based on x;
- generating a mantissa operand (M) and an exponent operand (h), wherein the mantissa operand and the exponent operand are representative of a second multi-precision operand (F′(pk,k)) that is based on the signal vector to be encoded;
- selecting a portion of Ψ′k to be modified based on the exponent operand;
- modifying the portion of Ψ′k based on the mantissa operand and location indicator to produce a modified multi-precision operand (Ψ′k+1);
- and
- generating a codeword (C) based on Ψ′k+1;
- wherein the codeword is for use by the encoder to encode speech, audio, image, or video signals and by a corresponding decoder to decode the speech, audio, image, or video signals.
7 more elements
A method for operating a decoder that generates a vector (x) from a codeword (C), the method comprising the steps of:
- receiving, by combinatorial decoding circuitry of the decoder, the codeword (Cπ);
- generating, by the combinatorial decoding circuitry, a first multi-precision operand (Ψ′k+1) based on Cπ;
- generating, by the combinatorial decoding circuitry, a mantissa operand (M) and an exponent operand (h), wherein the mantissa operand and the exponent operand are representative of a second multi-precision operand (F′(pk,k));
- selecting, by the combinatorial decoding circuitry, a portion of Ψ′k+1 to be modified based on the exponent operand;
- modifying, by the combinatorial decoding circuitry, the portion of Ψ′k+1 based on the mantissa operand and location indicator to produce a modified multi-precision operand (Ψ′k);
- decoding, by the combinatorial decoding circuitry, a position pk−1 of the (k−1)th non-zero elements of vector x;
- generating the vector (x) based on the position pk−1;
- passing the vector x to signal reconstruction circuitry of the decoder, and
- creating, by the signal reconstruction circuitry, an output signal comprising speech, audio, image, or video based on the generated vector (x).
6 more elements
A decoder comprising:
- combinatorial coding circuitry performing the steps of:
- receiving the codeword (Cπ);
- generating a first multi-precision operand (Ψ′k+1) based on Cπ;
- generating a mantissa operand (M) and an exponent operand (h), wherein the mantissa operand and the exponent operand are representative of a second multi-precision operand (F′(pk,k)) that is based on the signal vector to be encoded;
- selecting a portion of Ψ′k+1 to be modified based on the exponent operand;
- modifying the portion of Ψ′+1 based on the mantissa operand and location indicator to produce a modified multi-precision operand (Ψ′k);
- decoding a position pk−1 of the (k−1)th non-zero elements of vector x;
- and
- generating the vector (x) based on the position pk−1 and
- signal reconstruction circuitry to create an output signal of speech, audio, image, or video signals using the vector (x).
7 more elements
Dependencies are inferred from the claim text.