JPH0675235B2 - Tuner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a tuner that measures a deviation between a fundamental frequency of an input musical tone signal and a reference frequency which is a reference for comparison, and displays the deviation. is there.

<< Summary of the Invention >> The present invention provides a centimeter that is measured and calculated by a tuning device that displays a cent deviation on a display other than a VU meter, for example, a bar display as shown in FIG. By performing non-linear interpolation between the value and the cent value displayed on the display during measurement and calculation, and rewriting the cent value displayed on the display every certain time Δt, the VU meter needle To achieve continuous operation.
By displaying the cent value by such a method, even if the to-be-tuned signal fluctuates and the cent value is calculated in a scattered manner, it is easy to see, the response is good, the sense of stability is obtained, and the tuning can be easily performed. It was done.

<< Prior Art >> Conventionally, when the cent deviation of the tuning unit is displayed on a bar other than the VU meter using a bar as shown in Fig. 3, the calculated cent value is displayed as it is. However, if such a display is performed, the to-be-tuned signal fluctuates, and when the cent value is calculated in a scattered manner, the bars are also displayed in a scattered manner, so that it is very difficult to see and the tuning is difficult.

<< Problems to be Solved by the Invention >> In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to tune easily by continuously moving the bar display like a VU meter needle. It is

<< Means for Solving Problems >> In order to solve the above problems, the present invention continuously displays the bars by performing interpolation processing. The interpolation processing device calculates nonlinear interpolation based on the cent deviation calculated from the tuned signal and the cent deviation displayed on the display, and a bar display pattern corresponding to the cent deviation obtained by the interpolation processing is stored. The storage device and the display device for reading the display pattern of the bar from the storage device and displaying the display pattern on the display body are provided, and the display pattern of the bar is updated.

<< Function >> The bar display is performed as follows with the tuner configured as described above. The display is updated every certain time Δt. In the interpolation processing device, non-linear interpolation processing is performed using the cent deviation calculated from the tuned signal at time tn and the cent deviation displayed at the same time tn, and the cent deviation to be displayed next is calculated. The bar moves continuously by selecting the bar display pattern stored in the storage device according to the obtained cent deviation and rewriting the bar pattern displayed by the display device to the selected bar pattern. You can

<< Example >> This invention is demonstrated in detail below. FIG. 1 shows a block circuit diagram of a tuning device implemented in the present invention.

Musical sound signal input device 3 for converting musical sound signal 1 into electric signal 2
There is a pitch extraction device 4 for extracting the pitch from the electric signal 2, a cent value calculation device 5 for calculating the cent value from the pitch, and a storage device 8 for storing the calculated cent value.

There is an interpolation processing device 6 that executes an interpolation process between the calculated cent value and the currently displayed cent value stored in the storage device 8, and corresponds to the interpolated cent value.
There is a display device 7 for displaying a bar pattern as shown in FIG.

Next, a case where the tuner according to the present invention is operated in the above-mentioned configuration will be described.

The musical tone signal 1 is input to the musical tone signal input device 3 and converted into a rectangular wave electric signal 2. The pitch extracting device 4 extracts a pitch from the electric signal 2. The cent value calculation device 5 calculates the deviation between the extracted pitch and the reference pitch stored in the storage device 8 as a cent deviation, and stores the obtained cent deviation in the storage device 8. The processing up to this point is performed sequentially. The interpolation process is executed as shown in the flowchart of FIG. 2 at every certain time Δt. FIG. 2 will be described below.

The cent value displayed on the display at the same time is subtracted from the cent value stored in the storage device 8 and calculated by the cent value computing device 5, and the difference is set to A. (Flowchart in FIG. 2) If the difference A is 0, the interpolation process ends without updating the displayed cent value. (Flowchart in FIG. 2) If the difference A is in the range of +1 to +7, the displayed cent value is 1
Is added. (Flowchart in FIG. 2) If the difference A is in the range of -1 to -7, 1 is subtracted from the displayed cent value. (Flowchart in FIG. 2) When the difference A is larger than +8 and smaller than -8, the difference A
Is divided by 4 and the value after the decimal point is truncated is added to the displayed cent value. (Flowchart in FIG. 2) The interpolation processing device 6 executes the processings 1 to 5 to update the display cent value.

FIG. 3 is a display pattern of bar display implemented in the present invention.
When an analog display such as a VU meter is realized by using a display such as a liquid crystal or a light emitting diode, and a liquid crystal segment is arranged, for example, a bar 10, a display cent value output from the interpolation processing device 6 is displayed. FIG. 11 is a diagram showing a display pattern of a lighting segment 11 selected by 13 when there is no sound and between −50 cents and +50 cents.

The display pattern is stored in the storage device 9, and the pattern of the lighting segment 11 to be rewritten next time based on the cent value calculated by the interpolation processing device 6 is referred to. Then, in the display device 7, the display of the display body is rewritten from the pattern currently displayed on the display body to the referenced pattern.

In Fig. 4, when a controlled signal with a cent deviation of 0 is input,
It shows how the displayed cent value changes from the silent state to 0 cent. The displayed cent value of 13 when there is no sound is -50 cents. FIG. 4 will be described below.

The cent value of the to-be-tuned signal is calculated to be 0 by the cent value calculation device 5 and stored in the storage device 8. The cent value to be rewritten for the first time is calculated by the interpolation processing device 6 as follows.
The interpolation process is performed by referring to 0 cent stored in the storage device 8. If you subtract -50 cents from 0 cents (Fig. 2), the difference is greater than +7, so divide the difference by 4 and put -50
When added to cents, -38 cents is calculated (Fig. 2). Then, by referring to the lighting pattern of the bar corresponding to -38 cents from the storage device 9, the display on the display device 7 is rewritten from the silent display pattern to the -38 cents display pattern.

Even if the second rewrite, the calculated cent value 12 is 0 cents, so if -29 cents is calculated by performing the same interpolation process as at the first rewrite with -38 cents and 0 cents, it will be changed from -38 cents to -29 cents. The display is rewritten. In the third to 14th rewriting, the display cent value 13 processed in the same manner as above is −22, −17, −13, −10, −8, −6, −5, −4, −.
It changes from 3, -2, -1,0 cents and is rewritten to the display pattern corresponding to the cent value.

In this way, it continuously approaches the calculated cent value 12, which makes it easier to see, and when the difference between the calculated cent value 12 and the displayed cent value 13 is large, the change amount of the displayed cent value 13 is large, and when the difference is small, Since the amount of change in the displayed cent value 13 is small, the responsiveness is improved.

FIG. 5 shows a change in the displayed cent value 13 when the pitch of the to-be-tuned signal fluctuates. When the to-be-tuned signal is input from the silent state, the cent value calculation device 5 calculates +10 cents. In the interpolation processing device 6, the displayed cent value is −
Calculated to 35 cents. The display device 7 refers to the pattern corresponding to −35 cents from the storage device 9 and performs the first rewriting from the silent display to the −35 cents display pattern. From the second to the fifth rewrite, the calculated cent value is 12
Since there is no change in the value, the display cent value 13 is −24, −16, −10, − so that the interpolation processing device 6 gradually approaches +10 cents.
It is calculated as 5 cents and is rewritten into a display pattern corresponding to each cent value.

From the 6th to the 9th rewriting, the calculated cent value 12 is +10
Since the cent has changed from -20 cents, the displayed cent value 13 is -8, -from the current -5 cents due to the interpolation processing.
It changes to 11, −13 and −14 cents, and is rewritten to the display pattern corresponding to each cent value.

When the calculated cent value 12 changes from -20 cents to +5 cents from the 10th time to the 12th time, the displayed cent value 13 changes to -10, -7, -4 cents by the interpolation process and is rewritten to the display corresponding to each cent value. To be

From the 13th to the 15th time, the calculated cent value 12 has changed from +5 cents to −10 cents, so the displayed cent value 13 changes to −5, −6, −7 cents by the interpolation process, and the display is rewritten. .

In the 16th and 17th times, the calculated cent value of 12 is from -10 cents to +
Since it is changed to 5 cents, the displayed cent value 13 is changed to −4 and −2 cents by the interpolation processing and is displayed.

In the 18th and 19th, the calculated cent value of 12 is +5 cents to 0.
It changes to cent and the displayed cent value 13 is -1,
It changes from 0 cents and is displayed.

Since the tuner according to the present invention operates as described above, it requires rewriting several to several tens of times before displaying the calculated cent value, and even if the pitch of the tuned signal changes in a short time. Since it does not appear in the direct display, a stable display can be realized.

<< Advantages of the Invention >> Since the tuning device according to the present invention has the above-described configuration and operation, when a bar display is performed on a display body such as a liquid crystal or a light emitting diode, it is easy to see, has a sense of stability, and is responsive Since it is good, it has an effect that tuning can be easily performed.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of a tuner implemented in the present invention. FIG. 2 is a flowchart of the interpolation processing of the present invention. FIG. 3 is a bar segment lighting segment pattern diagram. 4 and 5 are change diagrams of the displayed cent value with respect to the calculated cent value. 1 ... tone signal 2 ... electrical signal 3 ... tone signal input device 4 ... pitch extractor 5 ... cent value calculator 6 ... interpolation processor 7 ... display device 8 ... storage device 9 ... storage device 10 ... bar 11 ... lighting segment 12 … Calculated cent value 13… Displayed cent value

Claims (1)

[Claims] 1. A musical tone signal input device for converting an inputted musical tone signal into a rectangular wave signal, a pitch extracting means for extracting a pitch from the rectangular wave signal, and a cent value calculating means for calculating a cent value from the extracted pitch. A first storage device for storing the cent value calculated by the cent value calculation means; a second storage device for storing a plurality of types of display patterns; and a cent value stored in the first storage device. The deviation value of the cent is calculated from the cent value currently displayed on the display device, a predetermined interpolation process is added to this, and the calculation is gradually performed to gradually approach the calculated cent value. An interpolation processing device that selects a display pattern in the second storage device corresponding to the above, and a plurality of displays that update and display the display pattern corresponding to each calculation result of the interpolation processing device. And a display device including a display device, and the interpolating process of the interpolating processing device, in accordance with a difference between the currently displayed cent value and the calculated cent value, changes the cent value when the difference is large. A tuning device characterized by repeating operations so as to reduce the amount of change in cent value when the difference is large and the difference is small.