Abstract: A nitride semiconductor substrate includes: a silicon single-crystal substrate; and a nitride semiconductor thin film formed on the silicon single-crystal substrate, wherein the silicon single-crystal substrate has a carbon concentration of 5E16 atoms/cm3 or more and 2E17 atoms/cm3 or less. This provides a nitride semiconductor substrate resistant against plastic deformation and a manufacturing method therefor.

Abstract: When the signal level of a signal AOD, to which a cancellation signal CND of ACD is added, is larger than the signal level of ACD, a rate of change calculation part 173 calculates the maximum value (=1) as a rate of change parameter for showing that the degree of noise cancellation should be made highest. When the signal level of AOD, to which CND of ACD is added, is smaller than the signal level of ACD, the rate of change calculation part 173 calculates a change parameter rate to show that the larger the difference between both the signal levels are, the lower the degree of the noise cancellation becomes. A cancellation signal generation part 175 then generates CND and transmits it to an addition part 171 while taking the values of the change parameter rate into consideration. As a result, proper noise control can be easily performed.

Abstract: A music search device, a music search method, a music search program, and a recording medium having the music search program recorded on it are provided. There is included a memory means for relating a music to a characteristic of the music and memorizing the music and the characteristics; a reproduction means for reproducing the music; a process means for processing the characteristic of the music thus reproduced by the reproduction means based on an instruction of a manipulation input; a characteristic detection means for detecting the characteristic of the music thus processed; and a search means for searching the music thus memorized by the memory means based on the characteristic of the music thus detected.

Abstract: To provide an audio signal processing system, a surround signal generation method and so on that are capable of obtaining stable output signal level and feeling of soundscape without depending on an audio input signal. A DSP inputs audio input signals respectively corresponding to a plurality of channels, and generates surround signals that have reflection sound and reverberate sound and that respectively correspond to the plurality of channels. The DSP generates the surround signal corresponding to one channel based on an audio input signal corresponding to the one channel, a variable number changing within the predetermined range in response to a signal level of the surround signal at a preceding predetermined time corresponding to the one channel, and the audio input signal corresponding to the other channel.

Abstract: When the signal level of a signal AOD, to which a cancellation signal CND of ACD is added, is larger than the signal level of ACD, a rate of change calculation part 173 calculates the maximum value (=1) as a rate of change parameter for showing that the degree of noise cancellation should be made highest. When the signal level of AOD, to which CND of ACD is added, is smaller than the signal level of ACD, the rate of change calculation part 173 calculates a change parameter rate to show that the larger the difference between both the signal levels are, the lower the degree of the noise cancellation becomes. A cancellation signal generation part 175 then generates CND and transmits it to an addition part 171 while taking the values of the change parameter rate into consideration. As a result, proper noise control can be easily performed.

Abstract: A first harmonic sound generating unit 1 generates a first harmonic sound signal as a product of a multiplication of a signal of a specific frequency and a signal including frequency components of odd multiples of a music signal. Then, frequency components of non-integer multiples shifted back and forth in the specific frequency from the odd multiples are generated based on the first harmonic sound signal. A full-wave rectifying unit 21 rectifies the first harmonic sound signal to generate a second harmonic sound signal including frequency components of even multiples. An adding unit 4 adds the first harmonic sound signal and the second harmonic sound signal, and then adds the additional value to the music signal.

Abstract: When boosting treble, first a signal X(T) of a fundamental tone component which is to be a subject of overtone production is extracted by a fundamental tone extraction filter section 210 from the signal which is to be the subject for being boosted. Next, a clip level calculation section 221 calculates a clip level based upon the signal X(T). And a comparison calculation section 222 performs clipping processing upon the signal X(T) on the basis of the clip level W(T), and generates a signal that includes overtone components. Consequently, it is possible to produce overtones whose processed contents are suitable for digital signal processing, without performing any division computation, and, when boosting the treble register, appropriate overtones can be reliably produced in a manner which does not give the listener any sense of discomfort.

Abstract: A corrective measurement part of a processing control part 119A measures an aspect of specific sound field correction processing performed on an acoustic signal received from a specific external device. Based on this measurement result, settings for cancellation of specific sound field correction processing performed on that acoustic signal are made for a correction cancellation part 310. Furthermore, an aspect of appropriate sound field processing corresponding to the actual sound field space is acquired by an appropriate correction acquisition part of the processing control part 119A. Based on the result acquired in this manner, settings for performing appropriate sound field correction processing upon a signal SND are made for a correction processing part 330. Thus, whichever one of acoustic signals received by a reception processing part 111 is selected, an output acoustic signal can be supplied to speaker units in after appropriate sound field correction processing.

Abstract: In a digital signal processor to perform digital signal process with respect to a music signal and to suppress a signal level to a maximum value when the signal level over the maximum value of processable values is generated by the digital signal processor, a first level correcting device corrects the signal level by multiplying the signal level of the music signal by a correction coefficient so as to make the signal level of the music signal over the maximum value, and a second level correcting device corrects the signal level by multiplying the signal level of the music signal corrected by the first level correcting device by a reciprocal of the correction coefficient.

Abstract: Problems To provide a harmonic sound generator and a method for generating harmonic sound so as to obtain frequency components of non-integer multiples shifted back and forth from the frequencies of odd multiples and even multiples with a simple configuration. Means for Solving Problems A first harmonic sound generating unit 1 generates a first harmonic sound signal as a product of a multiplication of a signal of a specific frequency and a signal including frequency components of odd multiples of a music signal. Then, frequency components of non-integer multiples shifted back and forth in the specific frequency from the odd multiples are generated based on the first harmonic sound signal. A full-wave rectifying unit 21 rectifies the first harmonic sound signal to generate a second harmonic sound signal including frequency components of even multiples. An adding unit 4 adds the first harmonic sound signal and the second harmonic sound signal, and then adds the additional value to the music signal.

Abstract: There is provided a music search device, a music search method, a music search program, and a recording medium having the music search program recorded on it, which enable to search a song other than that is currently reproduced while the user himself or herself processes the song that is currently reproduced and confirms a degree of process with his or her own ears. There is included a memory means for relating a music to a characteristic of the music and memorizing the music and the characteristics; a reproduction means for reproducing the music; a process means for processing the characteristic of the music thus reproduced by the reproduction means based on an instruction of a manipulation input; a characteristic detection means for detecting the characteristic of the music thus processed; and a search means for searching the music thus memorized by the memory means based on the characteristic of the music thus detected.

Abstract: Problems To provide a harmonic sound generator and a digital signal processor so as to surely generate harmonic sound on the basis of even a music signal with a small signal level. Means for Solving Problems In a digital signal processor to perform digital signal process with respect to a music signal and to suppress a signal level to a maximum value when the signal level over the maximum value of processable values is generated by the digital signal processor, a first level correcting device corrects the signal level by multiplying the signal level of the music signal by a correction coefficient so as to make the signal level of the music signal over the maximum value, and a second level correcting device corrects the signal level by multiplying the signal level of the music signal corrected by the first level correcting device by a reciprocal of the correction coefficient.

Abstract: To provide an audio signal processing system, a surround signal generation method and so on that are capable of obtaining stable output signal level and feeling of soundscape without depending on an audio input signal. DSP 5 inputs audio input signals respectively corresponding to a plurality of channels, and generates surround signals that have reflection sound and reverberate sound and that respectively correspond to the plurality of channels. The DSP 5 generates the surround signal corresponding to one channel based on an audio input signal corresponding to the one channel, a variable number changing within the predetermined range in response to a signal level of the surround signal at a preceding predetermined time corresponding to the one channel, and the audio input signal corresponding to the other channel.

Abstract: It is an object of the present invention to provide an acoustic system which, when producing a sound from pillow speakers, can provide a natural feeling, without bringing about any incongruity to a listener. The acoustic system is provided with a low pass filter for extracting a low frequency component of a reproduction signal outputted from a signal source and supplying the extracted signal to pillow speakers, and a high pass filter for extracting a high frequency component of the reproduction signal and supplying the extracted signal to a normal position speaker, thereby fixing a sound emitted from the pillow speakers and a sound emitted from the normal position speaker on the normal position speaker side.