Abstract: An audio mixing device includes: an adder that adds a plurality of PDM signals each converted from a plurality of digital audio signals; a D/A converter that performs D/A conversion on a digital audio signal outputted from the adder and outputs an analog audio signal; and a synchronization device that is provided prior to the adder, and that synchronizes each of a plurality of digital signals with one another by use of the same predetermined synchronization timing signal and outputs each of them to the adder.

Abstract: An audio mixing device includes: an adder that adds a plurality of PDM signals each converted from a plurality of digital audio signals; a D/A converter that performs D/A conversion on a digital audio signal outputted from the adder and outputs an analog audio signal; and a synchronization device that is provided prior to the adder, and that synchronizes each of a plurality of digital signals with one another by use of the same predetermined synchronization timing signal and outputs each of them to the adder.

Abstract: A disclosed received voice playback apparatus includes a characteristic acquiring unit configured to acquire first frequency characteristic values obtained by resolving digital vocal signals that are based on received vocal signals into predetermined frequency bands, wherein each first frequency characteristic value corresponds to one of the predetermined frequency bands; a setting unit configured to obtain second frequency characteristic values, wherein each second frequency characteristic value is set for one of the predetermined frequency bands; a computing unit configured to compute a gain for each of the predetermined frequency bands based on a difference between the first frequency characteristic value and the second frequency characteristic value; and a characteristic changing unit configured to change the first frequency characteristic values of the digital vocal signals by multiplying the digital vocal signals by each of the gains corresponding to one of the predetermined frequency bands of the digit

Abstract: A sound and music playback device includes: an output amplifier; a power supply circuit that supplies electric power to the output amplifier; and an output signal level judging circuit; wherein an output voltage value of the power supply circuit is changed based on a level of a sound and music signal to be outputted.

Abstract: A method and apparatus of mobile phone using a semiconductor device includes a first converter, a second converter, a first digital processing circuit, and a second digital processing circuit. The first converter converts a first digital audio signal sampled with a predetermined audio sampling frequency into a second digital audio signal sampled with a predetermined voice sampling frequency. The second converter converts a first digital voice signal sampled with the predetermined voice sampling frequency into a second digital voice signal sampled with the predetermined audio sampling frequency. The first digital processing circuit performs a predetermined digital computation on the second digital audio signal sampled with the predetermined voice sampling frequency and a third digital voice signal.

Abstract: A disclosed received voice playback apparatus includes a characteristic acquiring unit configured to acquire first frequency characteristic values obtained by resolving digital vocal signals that are based on received vocal signals into predetermined frequency bands, wherein each first frequency characteristic value corresponds to one of the predetermined frequency bands; a setting unit configured to obtain second frequency characteristic values, wherein each second frequency characteristic value is set for one of the predetermined frequency bands; a computing unit configured to compute a gain for each of the predetermined frequency bands based on a difference between the first frequency characteristic value and the second frequency characteristic value; and a characteristic changing unit configured to change the first frequency characteristic values of the digital vocal signals by multiplying the digital vocal signals by each of the gains corresponding to one of the predetermined frequency bands of the digit

Abstract: A method and apparatus of mobile phone using a semiconductor device includes a first converter, a second converter, a first digital processor, and a second digital processor. The first converter converts a first digital audio signal sampled with a predetermined audio sampling frequency into a second digital audio signal sampled with a predetermined voice sampling frequency. The second converter converts a first digital voice signal sampled with the predetermined voice sampling frequency into a second digital voice signal sampled with the predetermined audio sampling frequency. The first digital processor performs a predetermined digital computation on the second digital audio signal sampled with the predetermined voice sampling frequency and a third digital voice signal.

Abstract: A melody sound generating apparatus includes a musical-scale generator which produces a plurality of musical scales based on a recorded melody pattern, each musical scale being a set of musical notes arranged in a predetermined order and at fixed separations. A melody sound data generator produces an output melody sound data containing a plurality of sets of musical notes based on the plurality of musical scales supplied by the musical-scale generator, by adding the plurality of musical scales together. A sound generating mechanism plays a melody sound based on the output melody sound data supplied by the melody sound data generator.

Abstract: A method of detecting a noise level from audio signals produced consecutively in time by a microphone. The method includes the steps of evaluating an average level of the audio signals consecutively in time, and selecting the smallest of the average levels as the noise level. A telecommunication apparatus for adaptively controlling an audio output level in response to the noise level thus detected is also disclosed.

Abstract: A circuit for detecting digital data has a data-changing point detecting circuit for detecting a changing point of the digital data at which a value indicative of the digital data is changed from value 1 to value 0, or value 0 to value 1; an asynchronous detecting circuit for judging whether or not the changing point is caused at a timing synchronized with the timing of the internal clock signal; an asynchronous counter for counting the number of asynchronizations; a synchronous signal generating counter for generating a synchronous signal by the internal clock signal; and a reset control circuit for controlling the timing of a reset operation of the synchronous signal generating counter in accordance with outputs of the data-changing point detecting circuit and the asynchronous counter. Another digital data detecting circuit and a method for detecting digital data are also shown.

Abstract: An image data processing apparatus includes a plurality of registers each of which outputs an output signal in accordance with a corresponding signal of a plurality of input coincidence signals derived from the input image data, the output signal indicating whether or not a corresponding register has a maximum count value, and each input coincidence signal indicating whether or not a corresponding pixel among neighborhood pixels of a target pixel of the input image data coincides with a corresponding dot among predetermined reference dots at given locations relative to the location of the target pixel in the input image data, and a state checking part for outputting a state signal indicating whether or not the output signal level of a first register having the maximum count value currently changes from the previous level by detecting the current output signal level of the first register in accordance with the input coincidence signals and in accordance with the output signals of the registers.

Abstract: Disclosed is a washing method in which parts and products are washed free of residual smudges without using fleon-family solvents. The method of washing members such as parts or products comprises a first degreasing step for degreasing in nonaqueous liquid the members to be washed after worked, a second degreasing step for degreasing the members being washed in an aqueous liquid which dissolves the nonaqueous liquid, a finish washing step for washing in the aqueous liquid, a rinsing step, and a drying step, wherein the drying step is performed in a plurality of pure water baths, the temperature of a last pure water bath is established to a range of 70.degree. to 85.degree. C., and the washed members are taken out from the pure water bath for drying the surfaces thereof.Also, the washing method is disclosed in which pure water in a plurality of the pure water baths has temperature gradient in the sequence of washing steps.

Abstract: An orthogonal transformation arithmetic unit performs a discrete cosine transformation with respect to a digital signal and compresses discrete cosine transformed data by quantizing and Huffman-coding processings thereof. The arithmetic unit Huffman-decodes the compressed data and demodulates the Huffman-decoded data to a digital signal by performing inverse quantization and an inverse discrete cosine transformation with respect to the Huffman-decoded data. The arithmetic unit has a memory section for storing one line block of image data of brightness and color signals converted to digital signals; and a section for processing the discrete cosine transformation and having a preprocessing circuit for performing adding and subtracting operations with respect to the image data read out of the memory section such that some values of discrete cosine transformation coefficients used in the discrete cosine transformation are partially set to zero. The other orthogonal arithmetic units are also shown.