Abstract: An audio mixing device includes: a mixing circuit configured to mix a plurality of pieces of audio data to be played included in first to p-th audio data among first to n-th audio data when the plurality of pieces of audio data are input in a same period, and output a mixing signal, n being an integer of three or more and p being an integer equal to or larger than two and less than n; and an arbitration circuit configured to arbitrate input of (p+1)-th to n-th audio data among the first to n-th audio data to the mixing circuit.

Abstract: Provided is a semiconductor device. In a first operation mode, a first modulated signal is input to a plurality of inverter circuits provided in a first amplifier circuit, and a second modulated signal is input to a plurality of inverter circuits provided in a second amplifier circuit. In a second operation mode, a test signal generation circuit modulates a test signal to generate a third modulated signal and a fourth modulated signal. The third modulated signal is input to some of the plurality of inverter circuits provided in the first amplifier circuit, and outputs of other inverter circuits have high impedances. The fourth modulated signal is input to some of the plurality of inverter circuits provided in the second amplifier circuit, and outputs of other inverter circuits have high impedances. A peak frequency detection circuit detects a frequency range including a frequency of the test signal at which an impedance of a sound reproduction device peaks.

Abstract: An audio mixing device includes a gain setting circuit configured to set first to n-th gains based on a command input from the outside, n being an integer of two or more, and a mixing circuit configured to output a mixing signal obtained by mixing two or more of first to n-th multiplication data obtained by respectively multiplying first to n-th audio data by the first to n-th gains. In a case where the j-th gain of the first to n-th gains is set to a first value, when the j-th gain is to be set to a second value different from the first value, the gain setting circuit transitions the j-th gain from the first value to the second value in a stepwise manner in a j-th gain change section of first to n-th gain change sections.

Abstract: Provided is a semiconductor device including: a first modulation circuit configured to receive a first sound source signal, sigma-delta modulate a signal based on the first sound source signal, and output a first sigma-delta modulated signal; a second modulation circuit configured to pulse-width modulate a signal based on the first sigma-delta modulated signal, and output a first pulse-width modulated signal; a first modulation inspection circuit configured to inspect the first modulation circuit; and a second modulation inspection circuit configured to inspect the second modulation circuit, in which the first modulation inspection circuit and the second modulation inspection circuit are separated from each other.

Abstract: Provided is a semiconductor device including: a pulse-width modulation circuit configured to pulse-width modulate a signal based on a first pulse-code modulated signal that is a sound source signal, and output a first pulse-width modulated signal; a first conversion circuit configured to convert a second pulse-width modulated signal based on the first pulse-width modulated signal into a second pulse-code modulated signal; and a comparison circuit configured to convert the first pulse-code modulated signal into a first comparison target signal by an inversely convertible conversion method, convert the second pulse-code modulated signal into a second comparison target signal by the conversion method, and compare the first comparison target signal with the second comparison target signal.

Abstract: A circuit device (100) includes a PWM signal output circuit (110) that outputs a PWM signal (SPWM) to a sound outputter (10), and a processing circuit (120) that controls the PWM signal output circuit (110). The frequency band that the sound outputter (10) can output is denoted as an outputtable band, and the frequency band lower than a lower limit of the outputtable band is denoted as a non-output low frequency band. The PWM signal output circuit (110) outputs a PWM signal (SPWM) based on pseudo sound data in which overtones, of a plurality of overtones of a fundamental tone belonging to the non-output low frequency band, that belong to the outputtable band are used.

Abstract: An audio mixing device includes: a gain setting circuit configured to set first to n-th gains based on a command input from the outside, n being an integer of 2 or more; and a mixing circuit configured to output a mixing signal obtained by mixing two or more of first to n-th multiplication data obtained by respectively multiplying first to n-th audio data by the first to n-th gains.

Abstract: A circuit device (100) includes a PWM signal output circuit (110) that outputs a PWM signal (SPWM) to a sound outputter (10), and a processing circuit (120) that controls the PWM signal output circuit (110). The frequency band that the sound outputter (10) can output is denoted as an outputtable band, and the frequency band lower than a lower limit of the outputtable band is denoted as a non-output low frequency band. The PWM signal output circuit (110) outputs a PWM signal (SPWM) based on pseudo sound data in which overtones, of a plurality of overtones of a fundamental tone belonging to the non-output low frequency band, that belong to the outputtable band are used.

Abstract: A semiconductor device is provided with a data storage unit configured to store speech reproduction data that includes transition destination information or speech recognition option data that includes transition destination information, and a processor configured to perform processing for generating an output speech signal using speech reproduction data read out from the data storage unit or perform speech recognition processing on an input speech signal using speech recognition option data read out from the data storage unit, and to read out, based on the transition destination information included in speech reproduction data or speech recognition option data used in the processing, speech recognition option data or speech reproduction data to be used in the next processing from the data storage unit.

Abstract: A voice data creation system includes a dictionary data memory section that stores dictionary data for generating synthesized voice data corresponding to text data; an edition processing section that displays an edition screen for editing a voice guidance message as a sentence including a plurality of phrases to receive edition input formation so as to perform an edition processing based on the edition input information; a list information generation processing section that generates list information relating to each sentence and phrases included in the each sentence based on a result of the edition processing; a phrase voice data generating section that determines a target phrase for voice data creation based on the list information to generate and maintain voice data corresponding to the target phrase determined for voice data creation based on the dictionary data; and a memory write information generating section that determines a target phrase to be stored in a voice data memory based on the list informat

Abstract: An emulation system emulates a sound IC having a built-in ROM and reproducing sound data stored in the built-in ROM or received sound data. The emulation system includes: a sound data storage section storing sound data to be stored in the built-in ROM; a command reception section; a command conversion section that performs a command conversion process that converts a built-in ROM data reproduction command into a data-attached reproduction command having a format interpretable by the sound IC when the command conversion section has received the built-in ROM data reproduction command; and a converted command transmission section. The command conversion section reads sound data from the sound data storage section based on the received built-in ROM data reproduction command, and generates the data-attached reproduction command to which the read sound data is attached.

Abstract: To decrease the number of arithmetical operations in a filtering process for decoding a digital signal and reduce a cost required for decoding. A filtering method for use in decoding a digital signal from a frequency domain to a time domain includes: a first step of multiplying an input data stream and a transformation matrix that is decomposed into a sparse matrix from an inverse MDCT transformation matrix for making the inverse MDCT transformation of the input data stream composed of a plurality of data blocks, and has a smaller size than the inverse MDCT transformation matrix, to acquire an output data stream composed of a plurality of data blocks; a second step of storing predetermined data contained in each data block of the output data stream; and a third step of generating the digital signal in the time domain on the basis of each data block acquired at the first step and the predetermined data stored at the second step in processing the former stage data block.

Abstract: To decrease the number of arithmetical operations in a filtering process for decoding a digital signal and reduce a cost required for decoding. A filtering method for use in decoding a digital signal from a frequency domain to a time domain includes: a first step of multiplying an input data stream and a transformation matrix that is decomposed into a sparse matrix from an inverse MDCT transformation matrix for making the inverse MDCT transformation of the input data stream composed of a plurality of data blocks, and has a smaller size than the inverse MDCT transformation matrix, to acquire an output data stream composed of a plurality of data blocks; a second step of storing predetermined data contained in each data block of the output data stream; and a third step of generating the digital signal in the time domain on the basis of each data block acquired at the first step and the predetermined data stored at the second step in processing the former stage data block.