SU1319073A1 - Device for digital sound recording and reproducing - Google Patents

Abstract

This invention relates to audio engineering and can be used to produce digital phonograms. The purpose of the invention is to increase the reliability of the device. Sound vibrations from the sound receiver 1 through the voltage divider 2, one of the release keys and the emitter follower 4 are fed to the input of the amplifier 5, and after amplification are converted to a 17-bit code. The conversion into code is performed by scanning the light beam along the plane of the entrance pupils of one quantizing line 9 of the optical fibers with the reflecting surface of the piezoelectric deflector 6. The light signal is converted into an electrical 6vioKa 10 photodetector, which outputs the ready code from memory block 15. The first decoder 11 switches the output of the photodetector to the input of the corresponding cell of the block 15. The decoder 12, according to the incoming code, connects the corresponding stage of the divider 2 to the input of the emitter repeater 4, changing the transfer coefficient of the divider 2. The codes of the signals accumulate in the registration unit 20, where are digital soundtrack. When produced, codes are issued to a digital-to-analog converter 21, amplified by amplifier 23, and reproduced by loudspeaker 24. 2 sig. i (L with so about with v & /

Description

The invention relates to audio engineering and can be used to produce digital phonograms.

The aim of the invention is to increase the reliability of the device.

FIG. 1 is a block diagram of the device; in fig. 2 - the plane of the entrance pupils of the Quantuish, her line of light guides.

The block diagram of the device contains a sound receiver 1, a controlled voltage divider 2, a block of disconnecting keys 3, an emitter follower 4, a first low-frequency amplifier 5, an analog-to-digital voltage converter — a code within the piezoelectric deflector 6, a light source 7 node 8 of the beam aperture, a quantizing line of 9 optical fibers, a block of 10 photoelectric converters (solar cells), a first decoder 11 and a second decoder 12 within the block of 13 NAND elements and a reversible shift register 14, as well as contains a memory block 15, a code register 16, a control block 17 comprising a generator 18 clock pulses and a frequency divider 19, a recording block 20, a digital-to-analog converter (DAC) 21 code - voltage, a low frequency filter 22, a second low frequency amplifier 23 and loudspeaker 24.

The device works as follows.

The sound vibrations are perceived and amplified by the sound receiver 1 and are fed to the input of the controlled voltage divider 2. Voltage divider 2 is a step resistive voltage divider whose transmission coefficient is changed by signals from decoder 12 by means of block disconnecting keys 3, connecting the output of the corresponding divider 2 stages to the input of emitter follower 4, matching the output of divider the voltage and the input of the first amplifier 5. The signal amplified by the amplifier 5 is converted into an optoelectronic ADC code. The conversion into code is performed by scanning the light beam with a piezoelectric deflector 6 along the plane of the entrance pupils of the quantizing line of optical fibers 9, converting the light signals into electrical ones in block 10 of the FEP, which enter the decoder 11. The output signals from the decoder produce ready-made codes corresponding to the levels of sound signals, from memory block 15 to register 16 code. From the register 16, the control signals from the frequency division block 19, the codes are output to the registration block 20. The piezoelectric deflector 6 is face-shaped and consists of a bimorph piezoelectric element, on the end of which the mirror reflector is fixed.

For scanning, the reverse electrical effect arising from

0

under the influence of an electrical signal from the amplifier 5. The light beam to the mirror reflector comes from the source 7 of the light radiation. Node 8 aperture

the beam is formed in the form of a narrow rectangle with a width not exceeding 0.8 of the diameter of the entrance pupil of the optical fiber of the quantizing line of nine optical fibers. The piezoelectric deflector 6 controls the signals from the amplifier 5 and produces a vertical scan of the light beam along the input ends of the optical fibers of the ruler 3. The light signal of each fiber is converted by the photoreceiver of the unit 10 into an electrical signal. The outputs of the photoreceivers are connected to the corresponding inputs of the first decimator 11. The decoder 11 is a device that commutes the output of the corresponding P1, its photoreceiver to the input of the corresponding memory cell of the block 15. The decoder 11 is a linear decoder

0 of the logical elements AND-NOT, providing the minimum signal delay and the required response to the formation of a pulse at the output. Block 15 contains ready-made codes of sound vibration signals.

The pulses from the outputs of the first decoder 11 are signals for issuing a willow code from the corresponding cells of block 15 to the register 16 of the code. Register 16 has 18 bits to receive 17 bits of the audio binary code. To each

0, the key in register 16 is preceded by a key, the keys are simultaneously opened by the control signal UCT from frequency divider 19 of control unit 17. In the open state, the keys pass the code bit signals to register 16. Following the UCT signal

5 follows the output signal from the frequency divider 19, which gives the code to the registration unit 20. The quantizing line 9 contains 2000 light guides and one central labeled “O, 1000 light guides up and down from the central one. The diameter of the entrance pupil of the optical fibers is 20 μm. The resolution resolution of the quantization is 100 µV, the coding range of the ruler is from minus 0.1 to plus 0.1 V (100 μVCSOO). Coded range

J-beeps from minus 10 to plus 10 B. The scanning spot of the beam is rectangular in shape with a vertical size of 15 µm and 2 mm horizontally (to facilitate alignment). Conversion of the signal from the amplifier 5 low frequency

0 into the code is produced as follows. In the absence of a signal at the output of the amplifier 5, the piezoelectric deflector 6 is in the neutral position and the scanning spot is fixed on the optical fiber. In the presence of the output of the amplifier 5 signal

5 for example, of a positive polarity under the action of the inverse piezoelectric effect, the reflecting surface of the deflector 6 is rotated to the corresponding

angle and moves the beam up. When the beam moves along the input ends of the optical fibers, signals are output to the corresponding inputs of the first decoder 11, which generates pulses at the output corresponding buses arriving at the inputs of the corresponding cells of block 15 and output codes from them to each other in register 16. Register bits 16 in the moments of the open state of the keys on the inputs that are opened by signals from the frequency divider 19.

The maximum opening frequency of the input keys is determined by the response time of the photodetector in block 10 and the time it takes for the signal to pass through the IS-NE decimator 11. At the photodetector response time of 1 µs and the signal delay time of an AND-NE element for ten nanoseconds, the maximum sampling rate is at least 500 kHz. The generator 18 generates clock pulses with a frequency of 500 kHz for frequency divider 19. To change the speed of information creation, a divider 19 is used with a corresponding sampling rate switch in the range from 40 to 500 kHz. The change in the transmission ratio of the divider 2 voltage in the digit range from 0.01 to 1, according to the amplitude of the input audio signal, is performed by the opening switches of block 3. During the recording of the sound, the opening switches connect different steps of dividers 2 to the input of the emitter follower 4 by control signal m from the decoder 12, respectively, to the codes from block 15. The decoder 12 is a linear decoder from block 13 of NAND logic elements and a reverse shift register 14 at the output with the number of bits equal to h SLE NC keys (the number of stages in the divider 2). Each bit output of the shift register 14 is connected to the input of its disconnecting key of unit 3. The first bit of the shift register is recorded when the device power is turned on, we determine the initial voltage divider transfer coefficient 1. When the amplitude of the audio signal increases, the divider 2 input the signal in the shift register 14 is shifted to the higher bits, controlled by turning on the release switches to reduce the transfer ratio of the divider 2, and with decreasing amplitude of the output signal, the signal in the shift register Line 14 is shifted to lower bits by controlling the on / off switch to increase the voltage ratio of voltage divider 2. The divider transmission ratio varies from 0.01 (at a signal at the input of the divider 10 V) to 4.0 (at a signal at the input of the divider to 0.1 V). The divider is made with a division factor error of 0.0005%.

The change in the transmission coefficient of the voltage divider 2 is made as follows.

When the signal from amplifier 5 is increased to deflect a scanning light spot on the upper light guide (with a positive signal polarity) or on the lower light guide (with negative polarity) 10, a pulse from the decoder 11 generates from the block 15 a code corresponding to 0.1 V signal at the input of the amplifier 5. Along with the arrival of this code, the register 16 enters (without the polarity sign) 15 and the input of the decoder 12. The output of the corresponding logic element of block 13 is a pulse that shifts the signal in the shift register 14 from the first o bit into the next one to turn on the corresponding disconnect key in

0 block 3. According to the control signal, the key connects to the emitter follower 4 input the next divider 2 stage, reducing the transmission coefficient by one level.

The signal from the output of amplifier 5 is reduced, the scanning spot is lowered below. At the same time, this pulse from the register 14 output goes to the corresponding input of the decoder 11 and, together with the signal from the photodetector of block 10, determines the appearance of a pulse on the corresponding output bus of the decoder 11, which issues from memory block 15 a code corresponding to the signal the input of amplifier 5 plus 0.1 V. With a further increase in the signal at the input of amplifier 5, the beam again hits the upper light guide and the signal from the output of the photodetector together with the present signal from the decimator 12 determines the output from block 15 of the code equal to 0.2 V. This code along with the issue in the register 16 enters

0 into the decipheror 12, the NAND element generates a pulse into the shift register 14, which shifts the signal present there to the next bit, closes the next key in block 3 (precedes it opens), switches the new section of the voltage divider, and the transmission coefficient decreases. This signal from register 14 is fed to the corresponding input of the first decoder 11 and, together with the signal from the photodetector unit 10, determines the output

0 c. Of the following code. With a further increase in the signal at the input of the divider 2, the process is similarly repeated. When reducing the input signal at the input of the amplifier 5, the scanning spot falls on the light guide “O in the center of the ruler 9.” From block 15

5, a code is presented, represented by zeroes in ten lower order bits, in the seven leading bits of which there are signals corresponding to the size of the input signal. Soot5

Corresponding to the code at the output of a certain logic circuit of the IS unit of block 13, a pulse is formed, shifting the signal in the shift register 14 in the adjacent low-order bit, the corresponding key in block 3 is switched on to increase the transmission coefficient of the voltage divider 2. With a further decrease in the signal at the input of the divider 2, the process is repeated. The decoder 12 does not respond

low frequency light source with a beam aperture forming unit located in front of the light reflector of the piezoelectric deflector, a quantizing fiber line whose optical inputs are located opposite the piezoelectric deflector reflector, a block of photoelectric converters whose optical inputs are located opposite the corresponding optical outputs of the line 15; , but only on the fiber Yunikov, as well as consistently

low frequency light source with a beam aperture forming unit located in front of the light reflector of the piezoelectric deflector, a quantizing fiber line whose optical inputs are located opposite the piezoelectric deflector reflector, a block of photoelectric converters whose optical inputs are located opposite the corresponding optical outputs of the optical fiber lines, as well as consistently

connected memory unit, code register, recording unit, digital-to-analog converter, low-pass filter, second low-frequency amplifier, loudspeaker and series-connected generator

Dyes representing voltage values: 0; 01; 02; 0.3 V, etc. with discreteness from 0.1 to 10 V.

Controlled divider voltage 2

It has 100 stages, and block 3, respectively. .. "...,

It has 100 disconnecting keys on-clock pulses and a frequency divider, MOS transistors with a turn-on time, the corresponding outputs of which are connected to 1 ISS. The amplitude of the signal at the input of amplifier 5 varies in total from 0 to 0.1 V.

In the process of recording, the audio signal codes from the register 16 are received in a 20-minute manner by the reliability of the device, entered into it after the registration unit 20, where the sequentially connected controlled composition plays a digital phonogram. In the code, the voltage isolator, the block of the integral polarity of the signal are mi-keys and the emitter follower, the first one, is encoded by "1. When playing and the second decipherors, and the input of the scientific research institute from block 20, codes are issued to the post-controlled voltage divider, respectively, to the DAC 21, 25 out of the sound receiver output signals, and

to the corresponding inputs of the code register and to the input of the registration unit, characterized in that, in order to increase

Chi Uvyd with divider 19 frequency. The frequency of the signal Vyvil is set in block 19 by the switch. Analog signals pass a 22 low pass filter, amplified in a second low pass amplifier 23 and

the emitter follower is connected to the input of the first low-frequency amplifier, the first group of inputs of the first decoder is connected to the outputs of the block of photovoltaic converters, and the outputs of the first

converted into sound oscillations of the loud decoder are connected to the corresponding inputs of the memory block, the second decoder has a block of AND-NOT elements whose inputs are connected to the corresponding outputs of the memory block, and reverse shift 24.

Claims (1)

Invention Formula A device for digital recording and reproduction of sound containing a sound receiver, a first low-frequency amplifier, an analog-to-digital voltage converter — a code as part of a piezoelectric transducer with a light reflector installed on it, the input of which is connected to the output of the first amplifier 3.5 A key register whose inputs are connected to the outputs of the corresponding AND-NOT elements of the second decoder, and the outputs of the bits of the reverse shift register are connected to the inputs of the corresponding disconnecting keys and to the corresponding inputs of the second group of inputs of the first decoder. connected memory unit, code register, recording unit, digital-to-analog converter, low-pass filter, second low-frequency amplifier, loudspeaker and series-connected generator , .. "..., clock pulses and a frequency divider, the corresponding outputs of which are connected clock pulses and a frequency divider, the corresponding outputs of which are connected device reliability; a voltage divider controlled in series, a switch-disconnecting key block and an emitter follower, the first and second decimators are entered into it, the input of the voltage divider being controlled, the audio receiver output connector, and the output to the corresponding inputs of the code register and to the input of the registration unit, characterized in that, in order to increase the emitter follower is connected to the input of the first low-frequency amplifier, the first group of inputs of the first decoder is connected to the outputs of the block of photovoltaic converters, and the outputs of the first the decoder is connected to the corresponding inputs of the memory block, the second decoder has a block of NAND elements, the inputs of which are connected to the corresponding outputs of the memory block, and a reversible shift.35 A key register whose inputs are connected to the outputs of the corresponding AND-NOT elements of the second decoder, and the outputs of the bits of the reverse shift register are connected to the inputs of the corresponding disconnecting keys and to the corresponding inputs of the second group of inputs of the first decoder. YuOO with & cathode 333 Scanning spot I o - @ Svegtyum O §S3S 339 1000 light guide 2 Compiled by A. Lisitsyn Editor G. VolkovaTehred I. VeresKorrektor M. Demchik Order 2516/45 Circulation 345 Subscription VNIIPI USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, ul. Project, 4