JP2005287005A - Spatial transmission feedback semiconductor audio amplifier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure a spatial transmission feedback semiconductor audio amplifier with the aid of a structure and a circuit for a reproduction sound to feedback to the amplifier properly by combining a light emitting diode of a feedback element with a photodiode. <P>SOLUTION: The amplifier is constituted of combining a light emitting diode A with a photodiode A, combining the light emitting diode B with the photodiode B, and building them in a semiconductor amplifier circuit as the feedback element in a legged small-typed resonator with 70mm height, 150mm width, 135mm depth, made from a case combined by aluminum and iron which is thin with 1.0mm thickness and is apt to receive a resonance vibration. A terminal of the light emitting diode and the terminal of the photodiode are not cut and are attached directly to a substrate. The amplifier is set up holding a lower portion resonance adjusting body on a large-sized resonance body whose side face/bottom face are strong and whose upper face is made from the case to be apt to receive the resonance vibration, and the upper portion resonance adjusting body is placed on the amplifier and is set up on a strong table on a line of the loudspeaker. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention is a spatial transmission feedback semiconductor audio amplifier that uses a sound wave vibration emitted from a speaker to vibrate a light-emitting diode as a feedback element and applies feedback to an optical signal.

In recent semiconductor audio amplifiers, the quality of component elements has improved, and the development of circuit technology has made it impossible to improve performance further. The distortion data is lower than that of vacuum tube type audio amplifiers, and is measured. The limit low distortion amplifier has also appeared, and because the vibration is transmitted to each component in the amplifier, the amplifier case has a hard structure that is hard to transmit vibration inside, and it is transparent and stands up The sound is fast and good, but the sound is generally harder and cooler than a vacuum tube audio amplifier. S / N deteriorates due to noise from the power source, noise from the power source, and noise from the outside, and the stereo localization and the perspective of depth and stereoscopic effect deteriorate.

Semiconductor audio amplifiers are lower in distortion than vacuum tube audio amplifiers in data, and distortion in the sense of audition should be lower, but in general, vacuum tube audio amplifiers feel lower in auditory distortion, feel softer and warmer, and fluctuate Sound and lingering sound are good and shadows are rich, especially with 300B vacuum tube audio amplifiers, the perspective of localization, depth and three-dimensionality is good, and it is generally known in the audio world, but for fast-rising sounds In general, followability is poor compared to semiconductor amplifiers, which is a drawback.
Japanese Patent Application No. 2003-07185

The vacuum tube audio amplifier is easy to vibrate the grid due to the structure of the vacuum tube, and the sound wave vibration emitted from the speaker vibrates the glass tube of the vacuum tube, and the vibration is secondarily transmitted to the grid. The audio signal is shaken, the distortion in the sense of audition is low, the soft and warm sound is heard, the fluctuation sound and the reverberation sound are good, and the audio system is as shown in Fig. 1. (2) The measuring amplifier is the speaker In the state where it is placed on the line and placed on a hard stand with a height of 1 m, (4a) the low frequency transmitter A is connected to (3a) the left amplifier (3b) and the right amplifier as shown in FIG. 3) The left speaker (1b) emits a 5W output sound from the right speaker, as shown in FIG. 3 (2) In the experimental measurement with the method of connecting the low frequency transmitter B to the measurement amplifier, (2) the measurement amplifier The vacuum tube type (2) A sine wave is input to the measurement amplifier, and (4) the frequency of the low-frequency transmitter A in FIG. Then, when the output is set to 5 W, the waveform of the (5) thin cross copy of (2) the measurement amplifier output (2) input by the low frequency transmitter B of FIG. It is confirmed that the synchroscope waveform when the speaker input is 5 W in FIG. 4 is swung up and down as shown in (7) Waved waveform A, (8) Waved waveform B, and (9) Waved waveform C. it can.

(2) In the experimental measurement method in item 4, the input of the measurement amplifier is short-circuited between the ground and no signal, and (4) the frequency of the low frequency transmitter A in FIG. When the resonance frequency is set to 5 W, a waveform of several millivolts of the same frequency as the frequency of the low-frequency transmitter A is output from (2) the measurement amplifier by (5) the thin cross copy. Therefore, we are returning, and this is drawing out the good aspects of vacuum tube amplifiers, and even semiconductor audio amplifiers find materials that have the same effect as glass tube and grid of vacuum tubes, and make circuits and structures Is a point.

The output impedance of recent audio equipment is very low, about 50-100Ω, and the input impedance is as high as 10KΩ or more. When high-frequency signals are connected with common-sense signal cables, standing wave noise due to mismatching, noise from the power source, In order to reduce the S / N ratio due to the effect of noise from outside, and the stereo sense and depth / stereoscopic view sound as if the sound is auditioned. When a resistor of 600Ω to 1KΩ close to the output impedance is connected in parallel to the input side of the amplifier, the semiconductor amplifier attenuates the high frequency information signal as well as each noise. Therefore, the sound wave vibration from the speaker is fed back to the amplifier and attenuated in the same way as the vacuum tube type. In that to recover the information signal of the high frequency range.

5 (10) In the small resonator with legs, as shown in FIG. 6, (14) The light emitting diode is attached to the substrate in a state of being easily shaken, (15) Direct audio using the combination with the photodiode as a feedback element (15) The output audio signal of the photodiode is also shaken and returned, and the feedback energy balance of the audio signal band is balanced, so that the best feedback effect is obtained. For this purpose, (11) a large resonator, (13) a lower resonance adjuster is sandwiched, (10) a legged small resonator is placed on top, and (12) an upper resonance adjuster is placed on each. The main feature is to adjust the material, volume and weight.

By inserting the spatial transmission feedback semiconductor audio amplifier of the present invention into an audio system, a pin plug / jack adapter with a built-in noise suppression resistor can be inserted between the input of the power amplifier and the audio signal cable. Pull out the goodness of each of the amplifier and semiconductor amplifier, the prospect is so good that the S / N is playing well in front of you, the sound rises quickly, but the sound does not become stiff, it is warm and soft, a sense of temperature The sound is dense and rich in reverberation, reverberation, and shadows.For example, the fluctuation sound of strings of stringed instruments, the reverberation of piano is very beautiful, and the peak due to the acoustic characteristics of the room is suppressed. In other words, CD is more than SACD and 2-channel 192KHz DVD audio. Becomes a reproduced sound, DVD audio of SACD and 2-channel 192KHz is close to the air feeling of the 5.1-channel playback playback sound, especially the music software of the current majority is in the CD, it can be said that the revolutionary invention of the audio.

In order to improve the sound quality of the entire audio system, including the room, capture the sound wave vibration of the audio emitted from the speaker and diffused into the space, and return it to the semiconductor audio amplifier. We devised and realized audition repeatedly.

(14a) Light emission in FIG. 7 within the height 70 mm, width 150 mm, and depth 135 mm of a small resonator with a leg made of a case of a combination of thin aluminum and iron of 1.0 mm thickness as shown in FIG. The diode A and (15a) the photodiode A are combined, and (14b) the light emitting diode B and (15b) the photodiode B are combined into a discrete semiconductor amplifier circuit as shown in FIG. (17) Light-emitting diode terminal and (18) Photodiode terminal is not cut off and is easily shaken. (16) Directly attached to the board. This amplifier is made of a metal case that has strong side and bottom and is easy to resonate. In addition, (11) a large resonator having a height of 80 mm, a width of 430 mm, and a depth of 300 mm, a 2 mm thick rubber (13) A lower resonance adjustment body is sandwiched between a sheet, 0.8mm thick punching metal and 1720g B5 size binding structure, and (10) 1000g B5 size on top of a small resonator with legs (12) Place the upper resonance regulator in the bookbinding structure, and install them on the speaker line due to differences in room characteristics and overall system characteristics, and adjust the installation position of the amplifier while listening to the playback sound. It is realized by moving back and forth from the line to the best state.

(12) Upper resonance regulator in FIG. 5 (10) Small resonator with legs, (13) Lower resonance regulator, (11) Volume of large resonator, thickness and weight of plate, (17) in FIG. The quality of the reproduced sound can be changed by changing the length of the light emitting diode terminal and (18) photodiode terminal. For example, from the feeling of listening (12) When the upper resonance adjuster is made heavy, the energy in the high range is strong. (13) Lower resonance adjuster, when it is lightened, the treble energy is lowered and the lingering sound is increased, the musicality is rich, the bass energy is increased, the excessive characteristics are improved, and the reproduced sound is good overall. If the lightening is made, the midrange energy increases, the reverberation decreases, the musicality decreases, and the prospects that rise are reduced, thus making it possible to create a sound with the characteristics that each producer thinks.

As shown in FIG. 7, the (19a) and (19b) current amplification transistors A and B of the complementary push-pull amplifier circuit with a power supply of ± 15 V have the same characteristics (14a) and (14b) light emitting diodes A and B (15a) and (15b) combining photodiodes A and B, (20) load resistance is 3 KΩ, (21) negative feedback resistance is 5 KΩ, and (22) negative feedback division resistance is 1 KΩ, An ideal spatial transmission feedback semiconductor audio amplifier having a rectangular wave / sinusoidal waveform correction / phase correction, flat from DC to 300 KHz, and having an amplification degree of 12.8 dB can be obtained.

The current cutoff frequency of light emitting diodes and photodiodes is as low as 15 MHz, so that the rise delay of the rectangular wave is reduced. (20) The load resistance can be improved by reducing the load resistance, but the output is also reduced. (20) Load resistance The value is set to a non-feedback state, and the value is 3 KΩ, which becomes the rectangular wave sync waveform of FIG. 8 at 20 KHz, and the waveform is corrected by negative feedback to the square wave sync waveform of FIG. (21) The negative feedback resistance is 20 KHz and the value of 5 KΩ, which is the square wave sync waveform of FIG. 10, is set to (20) the load resistance or (21) the negative feedback resistance is the power supply voltage. Since the characteristics of the rectangular wave change depending on the amplification factor of the element, the value is set to the rectangular wave synchronized waveform of FIG.

The audio system is as shown in Fig. 1. (2) The measurement amplifier is placed on the speaker line and placed on a hard stand with a height of 1m, as shown in Fig. 2. (3a) Left amplifier (3b) Right (4) Low frequency transmitter A is connected to the amplifier, (1a) Left speaker (1b) Outputs 5W output sound from the right speaker, as shown in FIG. 3 (2) Measurement amplifier (6) Low frequency transmitter In the experimental measurement using the method of connecting B, (2) the electrical negative feedback of the spatial transmission feedback semiconductor audio amplifier which is the measurement amplifier is removed, (2) a sine wave is input to the measurement amplifier, and (4) in FIG. When the frequency of the low-frequency transmitter A is set to a frequency at which the amplifier resonates due to the sound wave vibration from the speaker and the output is set to 5 W, (2) the measurement amplifier output of (6) input from the low-frequency transmitter B in FIG. (5) The waveform of the thin cross copy is the frequency of the entire band. As in the case of a vacuum tube amplifier, the waveform when the speaker input is 5 W is shaken up and down as shown in (7) Shake waveform A, (8) Shake waveform B, and (9) Shake waveform C. (2) The input of the measurement amplifier is short-circuited between the ground and no signal, and (2) the frequency of the low-frequency transmitter A in FIG. When the frequency is set to 5 W, it is confirmed that a waveform of several millivolts of the same frequency as the frequency of the low frequency transmitter A is output from (2) the measurement amplifier by (5) Thin Cross Coupling. The resonant frequency of the spatial transmission feedback semiconductor audio amplifier of this example can be 680, 620, 500, 440, 320, and 280 Hz. In some prototype experiments with different dimensions, the number of resonant frequencies increases from the sense of listening. , Audio Energy balance of the band will be better.

Analog records contain a lot of information such as indirect sounds and instrumental body sounds, and soft and warm sounds are produced. However, the sampling frequency of CD software is 44.1 KHz, and information audio signals of 20 KHz and above are rapidly attenuated and hardened. However, with the spatial transmission feedback semiconductor audio amplifier of the present invention, the information audio signal attenuated by the signal fluctuation due to the feedback vibration is restored, a soft and warm sound is produced, and the fluctuation sound, reverberation sound, reverberation sound is rich, A thick transmission sound can be confirmed by auditioning, and the spatial transmission feedback semiconductor audio amplifier of the present invention can sufficiently reproduce a sound that rises quickly and can reproduce a sound similar to a concert hall or live house performance.

As shown in FIG. 12, (28) spatial transmission feedback semiconductor audio amplifier is inserted between (27) preamplifier and (29) power amplifier, (26) the output side of CD player or general (27) preamplifier, 30) The standing wave noise mixed between the audio signal cables, the noise from the power supply, and the jumping noise from the outside can be reduced by setting the (23) input impedance resistance of the spatial transmission feedback semiconductor audio amplifier circuit of FIG. Due to the feedback effect of the spatial transmission feedback semiconductor audio amplifier, only the high frequency information audio signal, which is an indirect sound, is recovered, and a warm sound with a good S / N and a good view is obtained.・ Rich reverberation and reverberation are rich, enabling a good reproduction with rich shadows.

The spatial transmission feedback semiconductor audio amplifier of the present invention is capable of sufficiently recovering and increasing only the high frequency information audio signal, which is possible due to the occurrence of standing waves caused by impedance mismatching that occurs when the power amplifier and the signal connection cable are connected. As shown in Fig. 11, the (24) pin plug and (25) have the purpose of being able to easily insert a resistor between the input of the power amplifier and the signal cable to suppress noise, noise from the power supply, and external noise. Create a united structure of the pin jack part, and insert a pin plug / jack adapter with a built-in 1KΩ resistor for noise suppression (29) between the input side of the power amplifier and (30) the audio signal cable as shown in FIG. Reproduction with excellent S / N, clear localization, expanse, depth, and 3D effect Enable sound.

There are many types of amplifiers in the audio industry, and output impedance and input impedance vary widely. There is a need to match resistance values to suppress standing wave noise, power supply noise, and external noise. As a result, the minimum connectable impedance of the output connection of the preamplifier is various, and the value of (23) input impedance resistance of the spatial transmission feedback semiconductor audio amplifier circuit of FIG. 7 is 2KΩ, 1KΩ, 620Ω, 240Ω with a switch Make it possible.

The feedback element has a combination of a light emitting diode and a photodiode for low frequency use, and is used for an analog amplifier, and a digital use has a combination of a laser diode, a photodiode, a phototransistor, and a photo IC, and is used for a digital amplifier. In the spatial transmission feedback semiconductor audio amplifier of the present invention, an analog amplifier and a PWM (pulse width modulation) type digital amplifier can be manufactured. A vacuum tube also serves as a feedback element. Comprehensive adjustment is difficult due to the relationship between the heat generation and the structure, and the same effect as the present invention cannot be achieved.

The current music software is CD / SACD / DVD audio, most of which is CD software, and the price of CD is cheap, and most of the purchased software is CD. If a pin plug / jack adapter with built-in noise suppression resistors can reproduce higher quality than SACD / DVD audio, it will become popular in large quantities, and audio is gradually declining as the audio population is declining. Even if the system is cheap, if a spatial transmission feedback semiconductor audio amplifier that can be manufactured at a popular price of the present invention is introduced, if it can be reproduced as high-quality audio, the audio population will increase and the audio industry will flourish again It has potential.

1 is a layout drawing according to an embodiment of the present invention. It is a signal connection side view for the dial tone generation concerning the Example of this invention. It is a signal connection side view for the feedback signal measurement concerning the Example of this invention. It is a synchronized waveform figure concerning the Example of this invention. It is a figure of the resonance body and resonance adjustment body which concern on the Example of this invention. It is attachment sectional drawing of the feedback element concerning the Example of this invention. It is an amplifier circuit side view concerning the Example of this invention. It is a synchronized waveform drawing of a rectangular wave without negative feedback according to an embodiment of the present invention. It is a synchronized waveform drawing of the rectangular wave at the time of mass negative feedback according to the embodiment of the present invention. It is a synchronized waveform drawing of a rectangular wave at the time of an appropriate amount of negative feedback according to an embodiment of the present invention. 1 is a drawing of a pin plug / jack adapter with a built-in resistor according to an embodiment of the present invention. It is explanatory drawing of the system connection in connection with the Example of this invention.

Explanation of symbols

1a Left speaker 1b Right speaker 2 Measurement amplifier 3a Left amplifier 3b Right amplifier 4 Low frequency transmitter A
5 Synchroscope 6 Low frequency transmitter B
7 Waveform A whose synchro waveform is shaken
8 Waveform B with synchronized waveform B
9 Waveform C of the synchronized waveform
10 Small Resonator with Leg 11 Large Resonator 12 Upper Resonance Tuning Body 13 Lower Resonance Tuning Body 14 Light-Emitting Diode 14a Light-Emitting Diode A
14b Light emitting diode B
15 Photodiode 15a Photodiode A
15b Photodiode B
16 Substrate 17 Light-emitting diode terminal 18 Photodiode terminal 19a Current amplification transistor A
19b Current amplification transistor B
20 Load resistor 21 Negative feedback resistor 22 Negative feedback dividing resistor 23 Input impedance resistor 24 Pin plug part 25 Pin jack part 26 CD player 27 Preamplifier 28 Spatial transmission feedback semiconductor audio amplifier 29 Power amplifier 30 Audio signal cable 31 1KΩ resistance for noise suppression Built-in pin plug / jack adapter

Claims (3)

Spatial transmission feedback semiconductor audio amplifier with feedback element that captures sound wave vibration of audio emitted from the speaker and diffused into the space, and feeds it back to the amplifier. The light emitting diode is attached to the substrate in a state where it is easily shaken in the amplifier circuit, and the light of the light emitting diode is shaken by the sound wave vibration of the audio emitted from the speaker and diffused into the space directly through the audio signal as a feedback element, 2. The spatial transmission feedback semiconductor audio amplifier according to claim 1, wherein a feedback element mounted on the output audio signal of the photodiode is also shaken and fed back. The amplifier circuit according to claim 2 is installed in a small resonator with a leg that emits sound from a speaker and diffuses in space, and faithfully transmits an acoustic wave vibration of an audio. The space according to claim 2, wherein a feedback element is mounted on the resonator body, wherein a lower resonator adjuster is sandwiched between the resonator and a small resonator with a leg is mounted on the resonator, and an upper resonance adjuster is mounted on the resonator. Transmission feedback semiconductor audio amplifier.

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