Apparatus, method and program for processing signal and method for generating signal

• US 20080189065A1
• Filed: 02/04/2008
• Published: 08/07/2008
• Est. Priority Date: 02/05/2007
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Nakano, Kenji, Asada, Kohei, Itabashi, Tetsunori
• Granted Patent: US 8,280,075 B2
• Time in Patent Office: Days
• US Class Current: 702/77
• CPC Class Codes: H04S 7/301 Automatic calibration of stereophonic sound system, e.g. with test microphone
• CPC Class Codes: H04S 7/302 Electronic adaptation of stereophonic sound system to listener position or orientation H04S7/301 takes precedence
• CPC Class Codes: H04S 7/307 Frequency adjustment, e.g. tone control H04S7/301 takes precedence

Abstract

A signal processing apparatus includes a signal output unit for outputting a measurement signal, the measurement signal being produced by synthesizing a signal composed of a concatenation of 2^d period signals with a sinusoidal signal, each period signal having a time-domain waveform period being 2ⁿ samples, the sinusoidal wave having a wave count within the concatenation period of 2^d period signals being other than an integer multiple of 2^d, and n and d being respectively natural numbers, and an analyzing unit for frequency analyzing a response signal obtained as a result of picking up the measurement signal output from the signal output unit.

Claims

1. A signal processing apparatus, comprising:

signal output means for outputting a measurement signal, the measurement signal being produced by synthesizing a signal composed of a concatenation of 2^d period signals with a sinusoidal wave signal, each period signal having a time-domain waveform period being 2ⁿ samples, the sinusoidal wave signal having a wave count within a concatenation period of 2^d period signals being other than an integer multiple of 2^d, and n and d being natural numbers; and

analyzing means for frequency analyzing a response signal obtained as a result of picking up the measurement signal output from the signal output means.

2. The signal processing apparatus according to claim 1, wherein the analyzing means synthesizes a first frequency analysis result obtained from frequency analyzing only a component of the period signal of 2ⁿ samples with a second frequency analysis result obtained from frequency analyzing only a component of the sinusoidal signal synthesized and obtains frequency analysis results of the measurement signal.

3. The signal processing apparatus according to claim 2, wherein the analyzing means obtains the first frequency analysis result from a result of a synchronization addition/averaging by an integer multiple of 2^d times the response signal of the measurement signal on a per unit of 2ⁿ samples basis and performing one of fast Fourier transform (FFT) and discrete Fourier transform (DFT) on the synchronization addition/average results, and obtains the second frequency analysis result by multiplying sine data and cosine data corresponding to the synthesized sinusoidal wave by the response signal of the measurement signal and summing resulting products.

4. The signal processing apparatus according to claim 2, wherein the analyzing means obtains the first frequency analysis result by synchronization addition/averaging by the integer multiple of 2^d times the response signal of the measurement signal on a per unit of 2ⁿ samples basis and performing one of fast Fourier transform (FFT) and discrete Fourier transform (DFT) on a synchronization addition/average results, and obtains the second frequency analysis result by performing one of FFT and DFT on a result obtained from downsampling the response signal of the measurement signal.

5. The signal processing apparatus according to claim 1, wherein the signal output means continuously outputs pre-stored period signals of 2ⁿ samples, outputs the sinusoidal wave signal generated based on a sine function and synthesizes the period signals and the sinusoidal wave signal on a real time basis.

6. The signal processing apparatus according to claim 1, wherein the measurement signal has a gain increased within a predetermined frequency band.

7. The signal processing apparatus according to claim 1, wherein each period signal is generated based on a signal containing a signal ranging from 0 Hz to Fs/2 Hz in steps of Fs/N Hz, N representing the number of samples of the period signal and Fs representing a sampling frequency, and

wherein the analyzing means calculates an impulse response by synchronization addition/averaging by the integer multiple of 2^d times the response signal of the measurement signal on a per unit of 2ⁿ samples basis and performing a calculation process on synchronization addition/averaging results and an inverted signal of the period signal.

8. A signal processing method, comprising steps of:

outputting a measurement signal, the measurement signal being produced by synthesizing a signal composed of a concatenation of 2^d period signals with a sinusoidal wave signal, each period signal having a time-domain waveform period being 2ⁿ samples, the sinusoidal wave signal having a wave count within a concatenation period of 2^d period signals being other than an integer multiple of 2^d, and n and d being natural numbers; and

frequency analyzing a response signal obtained as a result of picking up the output measurement signal.

9. A program for causing a computer to perform a signal processing method, comprising steps of:

outputting a measurement signal, the measurement signal being produced by synthesizing a signal composed of a concatenation of 2^d period signals with a sinusoidal wave signal, each period signal having a time-domain waveform period being 2ⁿ samples, the sinusoidal wave signal having a wave count within a concatenation period of 2^d period signals being other than an integer multiple of 2^d, and n and d being natural numbers; and

frequency analyzing a response signal obtained as a result of picking up the output measurement signal.

10. A method of generating a signal, comprising a step of generating a measurement signal, the measurement signal being produced by synthesizing a signal composed of a concatenation of 2^d period signals with a sinusoidal wave signal, each period signal having a time-domain waveform period being 2ⁿ samples, the sinusoidal wave signal having a wave count within a concatenation period of 2^d period signals being other than an integer multiple of 2^d, and n and d being natural numbers.

11. A signal processing apparatus, comprising:

a signal output unit outputting a measurement signal, the measurement signal being produced by synthesizing a signal composed of a concatenation of 2^d period signals with a sinusoidal wave signal, each period signal having a time-domain waveform period being 2ⁿ samples, the sinusoidal wave signal having a wave count within a concatenation period of 2^d period signals being other than an integer multiple of 2^d, and n and d being natural numbers; and

an analyzing unit frequency analyzing a response signal obtained as a result of picking up the measurement signal output from the signal output unit.