Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Yoshiaki Sawada

Shuji Miyasaka

Tomokazu Ishikawa

Takeshi Norimatsu

Mineo Tsushima

Kosuke Nishio

Ichiro Kawashima

Shinji Kojima

Naoki Shindou

An audio mixing/reproducing device includes an audio decoder () configured to decode an encoded audio input signal, an audio mixer () configured to mix an audio signal output from the audio decoder () with a non-encoded external audio input signal, and an audio encoder () configured to encode an audio signal output from the audio mixer () to generate an encoded audio output signal, and in addition, a switch () configured to generate a switch signal for controlling operations of each of the audio decoder () and the audio encoder () in response to a switch activation signal. The audio decoder () and the audio encoder () each support a plurality of encoding schemes, and the switch (), when switching the encoding scheme of the audio decoder () from a first encoding scheme to a second encoding scheme, controls the audio decoder () and the audio encoder () so that the encoding scheme of the audio encoder () is switched from the first encoding scheme to the second encoding scheme as in the audio decoder ().

Audio mixing/reproducing device

A decoding device () comprises a narrow-band decoding unit () operable to reproduce a PCM signal (P) from a narrow-band bit stream included in a wide-band bit stream (S), a wide-band decoding unit () operable to reproduce a PCM signal (P) having a frequency band which is wider than that of the PCM signal (P) reproduced by the narrow-band decoding unit () from the narrow-band bit stream and a band expanding bit stream included in the wide band bit stream (S) and a selecting unit () operable to select either the PCM signal (P) reproduced by the narrow-band decoding unit () or the PCM signal (P) reproduced by the wide-band decoding unit (), and to output the selected sound digital signal.

Encoding device, decoding device, and system thereof utilizing band expansion information

The present invention is a signal processing device which performs parallel processes A and B efficiently. There is a deviation in the throughputs of the process A and B in processing an audio signal. First to Nth sub signal processing sections have capabilities to complete the process A within a period (N&#xd7;T). A main signal processing sections has a capability to complete the process B within a period T. Efficient signal processing can be achieved by processing an input digital signal by means of distinct sub signal processing devices one after another and then processing the signal by the main signal processing section. (N&#xd7;T).

Parallel signal processing device for a portable audio system

An encoding apparatus includes a quantized spectral sequence generation section for generating a quantized spectral sequence by quantizing an audio signal with a predetermined quantization precision, and a circulating code vector quantization section for outputting a spectral sequence code containing circulating position identification information indicating how much a reference spectral sequence is circulated to obtain a circulant quantized spectral sequence which is most similar to the quantized spectral sequence.

Encoding apparatus and decoding apparatus

An exponent part extraction section extracts a bit series from the exponent part of an inputted floating point data. A mantissa part extraction section extracts the uppermost K bits from the mantissa part of the floating point data. A first conversion section inputs the output e from the exponent part extraction section and outputs the value of a function X(e) thereof. A second conversion section inputs the output f from the mantissa part extraction section and outputs the value of a function Y(f) thereof. A multiplier section multiplies together these values. By setting suitable tables in advance in the first and the second conversion sections, the calculation of the v^p for an item v of floating point data can be performed.

Signal processing unit and signal processing method including using an exponent part and a mantissa part for power generation

An encoder of the present invention includes: G storage sections for storing G groups of data; a selection section for selecting one of H Huffman codebooks having codebook numbers for each of the groups of data; G encoding sections Huffman-encoding the G groups of data by using the selected Huffman codebook; and an encoding section for encoding the codebook number of each Huffman codebook selected. The selection section includes a calculation section for calculating a code length and a control section for selecting one of the Huffman codebooks. When the Huffman codebook selected is an unsigned codebook, a number of bits required for sign information has previously been added to the calculated code length.

Growing community of inventors

Ibaraki, Japan

Yoshiaki Sawada