JPS62164092A - Tuning apparatus with liquid crystal display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tuning device that displays the frequency deviation of a sound to be tuned, such as a voice or musical instrument sound, from a fixed reference sound and is used for tuning.

[Summary of the invention]

The present invention provides a tuner whose display contents can be read as t+' (t) by digitally displaying the tuner's display using a liquid crystal display device.

Further, in order to achieve uniform and high-intensity illumination of the entire display section of the liquid crystal display device, an electroluminescence light emitting plate installed at a rear position of the liquid crystal display section and an external switch means for setting the illumination are provided. ON, OFF
By selectively illuminating the display section, we have achieved a tuner with a liquid crystal display that is unprecedentedly sophisticated and clear.

[Conventional technology]

A conventional tuner inputs an electric signal manually input to a waveform shaping circuit for the sound to be tuned through an external input circuit, and compares the output signal of the waveform shaping circuit with a fixed reference frequency of the sound to be tuned. However, a method is known in which a signal corresponding to the frequency deviation is converted into a DC voltage via a frequency-voltage conversion circuit and the frequency deviation is displayed on a VU meter display device. Moreover, instead of the VU meter, there is an LED meter display device using an LED element. The LED meter display device has LED elements arranged in parallel on an arc to display a signal corresponding to the frequency deviation in a light emitting manner similar to the operation of the VU meter. '
It has been known to display data using an I-ED meter display device via a J-arithmetic conversion circuit.

In addition, LEDs are used as lighting for the display device of such tuners.
The lamp was known.

[Problem that the invention seeks to solve]

The conventional tuner display was an analog display using a meter, but it had drawbacks such as error display due to differences in posture and difficulty in reading when comparing the meter dial and meter pointer. To overcome this drawback, there is a tuner that uses an LED instead of a meter. However, when LEDs are used, there are drawbacks such as low power consumption and low cost.

In addition, the conventional display illumination device of such a tuner is
ED lamps are the mainstream, but they have the drawback of not being able to provide uniform, high-intensity illumination over the entire display area.

[Means for solving problems]

The present invention is intended to eliminate the above-mentioned drawbacks, and its means include extracting the pitch of the to-be-tuned tone, comparing the extracted pitch with a fixed reference signal of the to-be-tuned tone, and calculating the deviation value from the reference frequency. a liquid crystal drive circuit connected to the output of the data conversion circuit; and a liquid crystal display connected to the liquid crystal drive circuit. The structure includes a section.

Further, a means developed to eliminate the drawbacks of the illumination device of the display section includes an external switch circuit, an electroluminescent driving circuit, and an electroluminescent light emitting plate.

[Operation] The operation of the above configuration is that first, the pitch extraction calculating means extracts the pitch of the tuned note, and then w! , a data conversion circuit for converting the calculation result of the pitch name and deviation value of the tuned tone calculated by the comparison calculation means with a fixed reference signal of the tuner into a human input signal of the liquid crystal driving means, and the data conversion circuit Through the liquid crystal drive circuit connected to the liquid crystal display unit, the liquid crystal display section is operated to perform manual display, thereby achieving the purpose of digital display using the liquid crystal display.

Further, the illumination of the electroluminescent light emitting plate installed at the rear position of the liquid crystal display section includes an electroluminescent driving circuit for driving the electroluminescent light emitting plate in response to a lighting setting signal from an external switch circuit; The electroluminescent light emitting plate emits light upon receiving the driving voltage of the electroluminescent driving circuit, thereby achieving the purpose of an illuminating device with uniform and high brightness over the entire display area, which is unprecedented.

〔Example〕

Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a block diagram of a tuner with a liquid crystal display according to the present invention. 1 in Figure 1 is an external input circuit, and external input circuit 1
The tuned tone is input by . A waveform shaping circuit 2 connected to the output of the external input circuit 1 and a reference signal generation circuit 4
and receives the output signal of the waveform shaping circuit 2 and the output signal of the reference signal generation port li+84, calculates the pitch of the external input signal, and calculates the deviation value from the normal frequency,
It has a pitch extraction arithmetic circuit 3 that converts the calculated arithmetic signal into data for liquid crystal display. Displayed on LCD.

FIG. 2 is a circuit block diagram of a tuner with a liquid crystal display, illustrating the pitch extraction calculation circuit 3 in detail based on the block section shown in FIG.

In Fig. 2, 1 is an external input circuit, which includes a waveform shaping circuit 2 that converts the tuned sound into an electrical signal to be measured into a pulse signal B, a counter 7 that receives the pulse signal B, and a pitch extraction circuit. has a pulse control circuit 8 that gives a signal to 9;
A reference signal generation circuit 4 that generates the count clock signal C of the counter 7, a storage circuit 11 that stores a table serving as a reference for calculating scale names and deviation values based on fixed pitches, and signals of the pitch extraction circuit 9. It has an octave pitch name search circuit 10 which receives a signal from the storage circuit 11 and a signal to a cent value calculation circuit 12, and converts the calculation signal of the cent value calculation circuit 12 into an input signal of the liquid crystal drive circuit 5. a data conversion circuit 13 for displaying data, and a liquid crystal display section 6 for receiving and displaying signals from the liquid crystal drive circuit 5.
It consists of

The waveform shaping circuit 2 converts, for example, the output signal waveform A of the external input circuit 1 shown in FIG. 3 into a pulse signal waveform. The pulse control circuit 8 controls the counter 3 to count each rise interval of the pulse signal B, and outputs each rise timing to the pitch extraction circuit 9. The pitch extraction circuit 9 extracts the pitch of the pulse signal B from the count values t+, h+ t* of each rising interval counted by the counter 7.

and Σtk, and when 3(a matches), the pitch is extracted as a pitch count value.

The storage circuit 11 stores a count value corresponding to each octave of a fixed reference pitch, a count value for each scale name corresponding to one octave, and a count value per cent value difference.

The octave/pitch name search circuit 10 stores the pitch count value extracted from the pitch extraction circuit 9, the count value corresponding to each octave of the fixed reference pitch from the memory circuit 11, and the count value for each scale name corresponding to one octave. After receiving the counted value, a comparison calculation is performed to calculate the octave and pitch name of the signal under measurement. Further, the 3γ output signal of the calculated octave/pitch name is output to the cent value calculation circuit 12. The cent value calculation circuit 12 calculates a deviation value by calculating the counted values of the octave and pitch name calculated by receiving the stored data of the counted value per cent deviation from the storage circuit 11, and The value is output to the data conversion circuit 13. The data conversion circuit 13 receives the output signal of the cent value calculation circuit 12 and converts the pitch name and deviation value signals of the signal to be measured into data for making them correspond to the address of the liquid crystal drive circuit 5. Output to the drive circuit 5. The liquid crystal drive circuit 5 receives the output signal from the data conversion circuit 13 and outputs a drive signal for displaying the pitch name and deviation value on the liquid crystal. The liquid crystal display section 6 receives the output signal from the liquid crystal drive circuit 5 and displays a liquid crystal display.

FIG. 4 shows another embodiment of the present invention, which will be described in detail based on the drawings. It should be noted that among the constituent factors in the figure, those that are the same as those shown in FIG. 2 are given the same numbers and their explanations will be omitted. In the figure, 1 is an external input circuit, 2 is a waveform shaping circuit, 7 is a counter, 8 is a pulse control i15 circuit, and 9 is a pitch extraction circuit. A calculation circuit, 4 a reference signal generation circuit, 10 an octave/pitch name search circuit, 11 a memory circuit, 12 a cent value calculation circuit,
13 is a data conversion circuit, 5 is a liquid crystal drive circuit, and 6 is a liquid crystal display section. The circuit is as described in FIG.

In the figure, reference numeral 14 denotes a switch circuit, which receives a switch signal for lighting up the liquid crystal backlight by opening and closing the switch circuit 14, and drives the electroluminescent light emitting plate 16 which has been repositioned at the rear position of the liquid crystal display section 6. It is composed of an electroluminescence drive circuit 15.

The electroluminescence drive circuit 15 receives a switch signal from the switch circuit 14 to turn on the liquid crystal bank light, and applies a drive voltage to the electroluminescence light emitting plate 1 to light the electroluminescence light emitting plate 16.
Supply to 6. The electroluminescent light emitting plate 16 can be turned on in response to a driving voltage to illuminate the liquid crystal display section 6.

In the embodiment described above, by providing the liquid crystal display section 6 in the display section, it is possible to digitally display the pitch name and frequency deviation value of the to-be-tuned tone. By providing the plate 16, it is possible to provide a tuner that has unprecedented high brightness and clear illumination effects.

〔Effect of the invention〕

As described above, according to the present invention, since the display section of the tuner is equipped with a liquid crystal, digital display is possible, and the displayed contents can be read at a glance.Moreover, the power consumption of the display section can be reduced, and the display The device has an effect that can be achieved at low cost.

In addition, since it is equipped with an electroluminescent light emitting plate installed at the rear of the liquid crystal display section, uniform illumination can be achieved over the entire display section, and high brightness and clear lighting effects that could not be achieved with conventional lighting devices can be achieved. It is possible to realize a tuner that has the following characteristics.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a tuner with a liquid crystal display according to the present invention, FIG. 2 is a detailed circuit block diagram of the tuner with a liquid crystal display, and FIG. 3 is an input signal A and an output signal B of a waveform shaping circuit. FIG. 4 is a circuit block diagram of a tuner with a liquid crystal display equipped with an electroluminescent light emitting plate. 1.--External input circuit 2--1 Waveform shaping circuit 3--Pitch extraction calculation circuit 4--Reference signal generation circuit 5--1 Liquid crystal drive circuit 6-・1 liquid crystal display section? --- Counter 8 --- Pulse control circuit 9 --- Pitch extraction circuit 10 --- Octave/pitch name search circuit 11 ---
Memory circuit 12 --- Cent value calculation circuit 13 --- Data conversion circuit 111 --- Switch circuit 15 --- Electroluminescence IK FA Circuit 16 --- Electroluminescence insensitivity light emitting temporary Applicant Seiko Electronics Co., Ltd. Agent Patent Attorney Tsumugi Mogami (and 1 other person) Input signal of wave carving luxury circuit
figure

Claims (2)

[Claims] (1) In a tuner equipped with a display device that extracts the pitch of a sound to be tuned, such as a voice or musical instrument sound, and displays the deviation of the extracted pitch from a reference frequency, a reference signal generation circuit, an external input circuit, and the a waveform shaping circuit connected to the output of the external input circuit; a pitch extraction calculation circuit for receiving the output signal of the waveform shaping circuit and the output signal of the reference signal generation circuit and calculating the pitch of the external input signal; A tuner with a liquid crystal display, comprising: a liquid crystal drive circuit connected to an output of a pitch extraction calculation circuit; and a liquid crystal display section connected to the liquid crystal drive circuit. (2) In a tuner equipped with a display device that extracts the pitch of a sound to be tuned, such as a voice or musical instrument sound, and displays the deviation of the extracted pitch from a reference frequency, a reference signal generation circuit, an external input circuit, a waveform shaping circuit connected to the output of the external input circuit; a pitch extraction calculation circuit for receiving the output signal of the waveform shaping circuit and the output signal of the reference signal generation circuit to calculate the pitch of the external input signal; A liquid crystal drive circuit connected to the output of the pitch extraction calculation circuit, a liquid crystal display section connected to the liquid crystal drive circuit, an electroluminescent light emitting board installed at a rear position of the liquid crystal display section, and the electroluminescent light emitting board. A tuner with a liquid crystal display equipped with an electroluminescence drive circuit for driving.