Rapidly optimized wireless microphone system and method for controlling thereof
First Claim
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1. A rapidly optimized wireless microphone system comprising:
- a transmitting part including an MP3 audio encoder, an FEC encoder, a modulator, a PN spreader, a high-frequency modulator, a power amplifier, a first controller converting an audio signal inputted through a microphone into an MP3 audio signal, FEC-encoding, and PN-spreading the MP3 audio signal, and then modulating the signal, to transmit it;
a receiving part including a low-noise amplifier, a high-frequency demodulator, a PN despreader, a demodulator, an FEC decoder, an MP3 audio decoder, an audio interface, an oscillator, a PLL circuit, and a second controller receiving the signal transmitted from the transmitting part, PN-despreading, FEC-decoding, and MP3-decoding the received signal, and then converting the signal into the original audio signal,wherein the MP3 audio encoder does not use psycho-acoustic modeling and, accordingly, performs quantization at a bit rate higher than a predetermined first bit rate without driving an outer repetitive loop of a repetitive loop required for the psycho-acoustic modeling, to thereby convert the audio signal inputted through the microphone into the MP3 audio signal;
wherein the MP3 audio decoder comprises;
a side information extracting part finding a frame synchronous bit pattern from a frame in MPEG audio, reading frame header, extracting side information, and extracting a scale factor;
a Huffman decoder selecting a proper Huffman table to perform Huffman decoding;
an inverse quantifier readjusting constant values created after the Huffman decoding into energy values in the actual frequency domain according to the scale factor;
an aliasing processor adding up frequency values in each frequency band symmetrically to remove aliasing distortion in order to mitigate the aliasing distortion generated during quantization;
a second hybrid converter entering the result of the aliasing process as an input of MDCT, to perform frequency-time conversion; and
a sub-band composite filter bank applying convolution-addition method in order to remove discontinuity generated during inverse MDCT;
wherein a matrix calculation procedure performed by the sub-band composite filter bank is converted into 32-point IDCT so as to reduce the amount of calculation by half; and
wherein the second hybrid converter reduces the amount of matrix calculation using the matrix conversion method applied to the sub-band composite filter bank.
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Abstract
Disclosed is a wireless microphone system having a rapidly optimized MP3 audio encoder and decoder, capable of reducing the amount of calculation without losing voice to minimize power consumption and complexity of the system, and a method for controlling the microphone system. The rapidly optimized wireless microphone system comprises a transmitting part including an MP3 audio encoder, an FEC encoder, a modulator, a PN spreader, a high-frequency modulator, a power amplifier, a first controller, for converting an audio signal inputted through a microphone into an MP3 audio signal, FEC-encoding, and PN-spreading the MP3 audio signal, and then modulating the signal, to transmit it; and a receiving part including a low-noise amplifier, a high-frequency demodulator, a PN despreader, a demodulator, an FEC decoder, an MP3 audio decoder, an audio interface, an oscillator, a PLL circuit, and a second controller, for receiving the signal transmitted from the transmitting part, PN-despreading, FEC-decoding, and MP3-decoding the received signal, and then converting the signal into the original audio signal, wherein the MP3 audio encoder does not use psycho-acoustic modeling and, accordingly, performs quantization at a bit rate higher than a predetermined first bit rate without driving an outer repetitive loop of a repetitive loop required for the psycho-acoustic modeling, to thereby convert the audio signal inputted through the microphone into the MP3 audio signal.
10 Citations
2 Claims
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1. A rapidly optimized wireless microphone system comprising:
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a transmitting part including an MP3 audio encoder, an FEC encoder, a modulator, a PN spreader, a high-frequency modulator, a power amplifier, a first controller converting an audio signal inputted through a microphone into an MP3 audio signal, FEC-encoding, and PN-spreading the MP3 audio signal, and then modulating the signal, to transmit it; a receiving part including a low-noise amplifier, a high-frequency demodulator, a PN despreader, a demodulator, an FEC decoder, an MP3 audio decoder, an audio interface, an oscillator, a PLL circuit, and a second controller receiving the signal transmitted from the transmitting part, PN-despreading, FEC-decoding, and MP3-decoding the received signal, and then converting the signal into the original audio signal, wherein the MP3 audio encoder does not use psycho-acoustic modeling and, accordingly, performs quantization at a bit rate higher than a predetermined first bit rate without driving an outer repetitive loop of a repetitive loop required for the psycho-acoustic modeling, to thereby convert the audio signal inputted through the microphone into the MP3 audio signal; wherein the MP3 audio decoder comprises; a side information extracting part finding a frame synchronous bit pattern from a frame in MPEG audio, reading frame header, extracting side information, and extracting a scale factor; a Huffman decoder selecting a proper Huffman table to perform Huffman decoding; an inverse quantifier readjusting constant values created after the Huffman decoding into energy values in the actual frequency domain according to the scale factor; an aliasing processor adding up frequency values in each frequency band symmetrically to remove aliasing distortion in order to mitigate the aliasing distortion generated during quantization; a second hybrid converter entering the result of the aliasing process as an input of MDCT, to perform frequency-time conversion; and a sub-band composite filter bank applying convolution-addition method in order to remove discontinuity generated during inverse MDCT; wherein a matrix calculation procedure performed by the sub-band composite filter bank is converted into 32-point IDCT so as to reduce the amount of calculation by half; and wherein the second hybrid converter reduces the amount of matrix calculation using the matrix conversion method applied to the sub-band composite filter bank.
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2. A rapidly optimized wireless microphone system comprising:
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a transmitting part including an MP3 audio encoder, an FEC encoder, a modulator, a PN spreader, a high-frequency modulator, a power amplifier, a first controller converting an audio signal inputted through a microphone into an MP3 audio signal, FEC-encoding, and PN- spreading the MP3 audio signal, and then modulating the signal, to transmit it; a receiving part including a low-noise amplifier, a high-frequency demodulator, a PN despreader, a demodulator, an FEC decoder, an MP3 audio decoder, an audio interface, an oscillator, a PLL circuit, and a second controller receiving the signal transmitted from the transmitting part, PN-despreading, FEC-decoding, and MP3-decoding the received signal, and then converting the signal into the original audio signal, wherein the MP3 audio encoder does not use psycho-acoustic modeling and, accordingly, performs quantization at a bit rate higher than a predetermined first bit rate without driving an outer repetitive loon of a repetitive loop reguired for the psycho-acoustic modeling, to thereby convert the audio signal inputted through the microphone into the MP3 audio signal; wherein the MP3 audio decoder comprises; a side information extracting part finding a frame synchronous bit pattern from a frame in MPEG audio, reading frame header, extracting side information, and extracting a scale factor; a Huffman decoder selecting a proper Huffman table to perform Huffman decoding; an inverse quantifier readjusting constant values created after the Huffman decoding into energy values in the actual frequency domain according to the scale factor; an aliasing processor adding up frequency values in each frequency band symmetrically to remove aliasing distortion in order to mitigate the aliasing distortion generated during quantization; a second hybrid converter entering the result of the aliasing process as an input of MDCT, to perform frequency-time conversion; and a sub-band composite filter bank applying convolution-addition method in order to remove discontinuity generated during inverse MDCT; and wherein the Huffman decoder performs Huffman decoding using a table, a predetermined part of which is cut off in advance to increase search speed.
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Specification
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Current AssigneeHyo-Choul Nam
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Original AssigneeHyo-Choul Nam
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InventorsNam, Hyo-Choul
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Primary Examiner(s)Kuntz; Curtis
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Assistant Examiner(s)Flanders; Andrew C
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Application NumberUS10/475,305Publication NumberTime in Patent Office2,618 DaysField of Search375/200, 375/202, 375/206, 375/141, 375/209, 700/94, 381/26, 381/91, 381/111, 381/121, 455/41.2US Class Current700/94CPC Class CodesH04R 3/00 Circuits for transducers , ...
