SU1500977A1 - Arrangement for synchronizing separate image and sound carriers - Google Patents

Abstract

The invention relates to cinema engineering, namely, to synchronization devices of separate image and sound carriers, and allows for high-precision synchronization of carriers and using any devices without alterations, i.e., audio sources. without the introduction of additional heads, sensors, etc. For this, the device contains a quartz oscillator of the reference frequency with a dividend, synchronization indicators, electronic keys, schemes for generating and recognizing starting signals, pulse distributors. When recording audio, the synchronization signals generated by a quartz oscillator are recorded on a single track with a phonogram in the form of pulses of high duty cycle at a fixed frequency. During playback, the pulses are extracted by the identification device and are blanked with an electronic key to prevent them from being heard on the photogram. A feature of the device is the correction of the phase of the clock pulses, coming from the crystal oscillator, which are essential for the synchronization of the film projector. The formation and identification schemes of the start signal correct media positioning errors during recording and playback. 1 il.

Description

The invention relates to cinematography, in particular, to electronic devices for synchronizing image and sound in systems with distributed carriers of image and sound,

The purpose of the invention is to increase the accuracy and stability of synchronization, to expand the functionality by enabling the use of any sound reproduction devices without alterations and simplifying the control of the device as a whole.

FIG. 1 shows a block diagram of the device according to FIG. 2 - crystal oscillator, frequency dividers, pulse distributor, and a start signal identification circuit with corresponding connections.

The device contains a source of synchronizing pulses, consisting of a crystal oscillator 1 and frequency dividers 2, the outputs of which are connected via an electronic switch 3 to the synchronization indicator 4, connected to a code connected to an image carrier 6 through the control unit 5 (film kj

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vector), the output of which through the sensor 7 pulses is connected to the second input of the synchronization indicator 4. Other outputs of dividers are 2. Frequencies. connected to the switch 8, the pulse distributor 9, the start signal shaping circuit 10 and the start signal identification circuit 11, the outputs of the pulse distributor 9, the start signal shaping circuit 10, and the sound resistance source 12 are connected via the switch 8 to the sound carrier 13. The output of the sound carrier 13 through the frequency comparator 14, the pulse former 15, and the start signal identification circuit 11 is connected to the electronic key 3. The outputs of the pulse former 15 and the pulse distributor 9 are connected via the coincidence circuit 16 to the control input 2 of the frequency dividers 2. Output The starting signal shaping circuit 10 is connected to the image carrier 6 via the identification circuit 11 of the starting signal. The outputs of the power-on unit 17 are connected to the control inputs of frequency dividers 2, the distributor 9 pulses, the circuits 10 forming

the start signal, the start signal recognition circuit 11 and the image carrier 6. The output of the power-on unit 17 is connected to the sound carrier 13. The output of the sound carrier 13 is connected to the audio reproducing device 18 via a second electronic key 19, the control input of which is connected to the output of the matching circuit 16.

The device also contains a quartz resonator 20, counters 21-26, elements AND-NO 27, elements OR-NOT 28, and elements Y-NOT 29-.

. The device works as follows.

Audio recording mode. The beginning of the phonogram. When the power-up unit 17 is connected to the network, all units of the device are supplied with power supply voltage, except for the image carrier 6 and sound carrier 13, and the signals from block 17 set frequency dividers 2 and the recognition signal 11 of the start signal 11 to the initial position. When the block 17 is switched to the Record mode, the supply voltage enters the sound carrier 13, resulting in

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the blocking voltage is removed from the dividers of 2 frequencies and from the circuit 11 of the recognition of the starting signal. Frequency dividers produce infrasonic frequencies equal to 0.2-4 Hz (to stabilize the speed of the drive of the carrier 6; images, to record control sync signals on the sound carrier 13, to form and extract the starting signals) , and sound frequencies equal to 1-8 kHz (carrier frequency of clock pulses on sound carrier 13 is sound), all the signals from the dividers 2 frequencies are synchronous and highly stable due to the master quartz oscillator 1. The signals from frequency dividers 2 are fed to the circuit 10. Forming a start signal, circuit 11, identifying the start signal and switch 8. At the output of the circuit 10 for forming the start signal, a pulse-code combination of the start signals is formed, under which the switch 8 connects to the input Recording the carrier 13 of the sound carrier frequency of the clock from the output of the divider 2 frequency.

The start signal identification circuit 11 compares the signals from the start signal generation circuit 10 with a predetermined code on the reference signals of the splitter 2 frequency and, at the end of the start signals, turns on the motor of the image carrier 6 and closes the electronic key 3 connecting the splitter 2 output to the synchronism indicator 4, to the second the input of which receives signals from the sensor 7 of the speed pulses. image carrier 6. The indicator 4, synchronism, made in the form of a reversible counter or shift register, through the control unit 5 provides synchronization of the carrier 6, the image and stabilization of its speed in accordance with the signals divides the frequency 2 of the reference crystal oscillator 1. At the same time, the switch 8. 9 pulses alternately commute to the recording input of the carrier 13. the sound signals of the source 12 sound coil and the carrier frequency of the reference sync signals from the 2 frequency divider, which ensures high noise immunity of the media carrier synchronization device and allows to use for the synchronization of separate media 6 and 13 ibrazheni and sound, respectively, short control phasing pulses with high duty cycle In the intervals between which the soundtrack is recorded. For example, the duration of the control phasing signals may be 0.01-0.1 s, and the follow-up period is 1-6 s. In this case, recording of sound of sound signals and control signals of phase synchronization of dividers 2 frequencies is recorded to the common track of the carrier 13.

Audio recording mode. Intermediate stages of recording. When stopping and starting a set of equipment in the recording process, the power-up unit 17 remains in the Record mode, ensuring that the start signal identification circuit 11 is kept on. Stop and start media 6 and 13

image and sound, respectively, is carried out with the help of an additional temporary stop switch in the power-on unit 17, which simultaneously disconnects and triggers dividers 2 frequencies. In this case, the electronic key 3 is closed, as a result of which the image carrier 6 (film projector) is turned on simultaneously with the sound carrier 13. The synchronization indicator 4 eliminates positional errors between the image and sound carriers arising during the transition process when switched on and stopped.

instrumentation.

The playback mode of the phonogram. Dp of transfer of a set of equipment to this mode is the power-on unit 17 from the initial mode, in which the dividers 2 frequencies and the start signal identification circuit 11 are set in the initial position, the image carrier 6 and the sound carrier 13. are turned off, transferred to the Play mode. In this mode, frequency dividers 2 are turned on, as a result of which the starting signal shaping circuit 10 is turned off, and sound carrier 13 through the frequency comparator 14 and pulse generator 15 is turned on, i.e. On the circuit, 11 recognition of the start signal, signals of the sound carrier 13 begin to arrive. Diagram 11 Identification0

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The start signal is recognized. The code recognizes the start signal and, after passing through the entire code combination, turns on the image carrier motor 6 and closes the electronic key 3. In this case, the synchronization indicator 4 maintains the projection speed in accordance with the frequency of the divider 2 of the frequency of the crystal oscillator 1, The control phasing signals coming from the sound carrier 13 through the frequency comparator 14, the pulse shaper 15 and the coincidence circuit 16 are fed to the control input of the frequency dividers 2 and schestvl dissolved correction phase the output signals of two frequency dividers. The coincidence circuit 16 transmits the phasing signals according to the signals of the distributor 9 pulses only at certain time intervals, which increases the noise immunity of the device. In addition, the signal from the devices and the playback of the phonogram is fed to the audio playback device 18 via the second electronic key 19, which is controlled by the output signal from the coincidence circuit 16, thereby eliminating the interfering effect of the carrier frequency of the control phasing signals during audio playback.

Thus, the use in the device for synchronization of separate carriers of image and sound as a source of clock pulses: a quartz oscillator 1 with frequency dividers 2 and a scheme for recording on the carrier of sound and subsequent selection of the start signal of control phasing signals provides high-quality sounding of narrow-film films using household tape recorders and home players

5 lei. When using a sound player in the carrier 13, the start of the plate is carried out manually, and only a precise installation of the tape in the film projector at the initial

0 is marked, and the positional error when switching on the sound carrier is automatically eliminated by the start signal selection circuit. This ensures that synchronization is maintained.

5 movements of separate carriers and in case of damage of separate control phasing signals on the phonogram, due to the high stability of the synchronization of the image carrier,

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which ensures the use of a quartz oscillator with a frequency divider in the reference frequency source.

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Claims (3)

Invention Formula 1, A device for synchronizing separate sound and image carriers, containing a synchronization indicator, connected via an engine control unit to an image carrier, kinematically connected to a pulse sensor, a matching circuit, a frequency comparator, an input connected to the information output of the audio carrier, and output with the input of the pulse former, the sound reproduction device and the source of the sound signals, which is due to the fact that, in order to improve the accuracy and stability of synchronization, A crystal oscillator, a frequency divider, the first electronic key, a pulse distributor, a switchboard, a starting signal shaping circuit, a start signal identification circuit, a power-up unit are entered, the output of the crystal oscillator is connected to the first input, the first the output of the power-on unit, to the third output of the coincidence circuit, the first, second, third and fourth outputs of the frequency splitter are connected to the first inputs of the starting signal shaping circuit, pulse distributor, comm the initiator and the circuit, the recognition of the start signal, the second, third and fourth inputs of the switch are connected respectively to the source of sound signals, the signal, the first output of the starting signal formation circuit and the first eight 0 output of the pulse distributor, whose second output is connected to the first input of the coincidence circuit, the second input of which is connected to the output of the pulse former and connected to the second input of the start signal identification circuit, the third and fourth inputs of which are connected to the second outputs of the start signal and power switching unit , the first output is connected to the control input, the first key, and the second output to the additional input of the carrier of the invention, the third, fourth and fifth outputs of the power supply unit connecting The output of the first key is connected to the first input of the synchronization indicator, to the second input of which the pulse sensor is connected, and the output of the iTopa switch is connected to the information input of the first input circuit of the formation of the starting signal, the second input of the pulse distributor and the power input of the image carrier. sound carrier. 2. The device on r. 1, characterized in that, in order to extend the functionality by providing the possibility of using any sound reproduction devices, a second electronic key is inputted into it, the input of which is connected to the output of the sound carrier, the output to the audio playback device, and the output match schemes. 3. The device according to claim 1, characterized in that, in order to simplify the control of the device, the sixth output of the power-on unit is connected to the power input of the sound carrier. 0 five 0 five 0