CS240533B1 - Sound records treatment device by means of electronic edition - Google Patents

Description

. The present invention relates to an apparatus for processing audio recordings by electronic editing, in particular in an embodiment. selective transcription of sound recordings on tape recorders on radio, television !, film, radio stations, etc. ¹ .

Audio tape recordings) need to be adjusted very often by selecting important parts and omitting irrelevant or disturbing passages of the recording. In practice, the most commonly used is a mechanical 'cut', by which the disturbing parts of the recording are cut by scissors, while the remaining parts need to be glued together. In addition to being labor-intensive and time-consuming, the adhesive also generates considerable waste of magnetorone tape, which is made from strategic raw materials and is costly. Finding the cut point by alternately moving the tape back and forth is, due to the required accuracy, mentally demanding and strenuous and, for a cassette recorder, only feasible after playback on the reel tape recorder.

Currently, in addition to mechanical shearing are used some methods of waste. from. electronic editing, in which individual passages are selected from the audio recording by replaying the recording from one tape recorder to the other. When manually operating both recorders, docie2

1'ujú. With good results, the transcription needs to be done gradually and requires very well-trained staff and high attention and concentration. Searching for a cut place is time consuming, and when listening, the speaker does not work well for coworkers. Synchronization of both machines requires longer training and good results in shear cleanness are achieved only at higher recording speeds, eg. 38.1 cm / sec on studio tape recorders. Such transcription is realized by the sound engineer in the presence of the editor.

Good results are obtained by using a time code which is recorded on a particular track, alongside the audio recording, by a separate recording head connected to the coding apparatus. When playing back a code track recording that has a fixed position relative to the sound recording, control pulses are obtained to control selective transcription with sufficient resolution.

The aforementioned methods of selective transcription and editing of the audio record have the disadvantages that the mechanical shearing caused by scissors causes, in addition to labor, a large waste of precious material. It cannot be performed on cassette recorders. Manually controlled electronic editing requires step-by-step editing of the cuts, such as mechanic cut and high dexterity, concentration, as well as consistent sound engineer training. Tape recorders which use counters to generate control pulses and electronic memory systems are expensive and are rare and cannot be used for direct, i.e. from. sharp electronic cuts. Here too, the accuracy is given by the accuracy of the running of the pickup rollers against the tape. There is no firm link between the generated control pulses and the audio recording on the tape. The resolution of counters is not sufficient. Recording the time code on a tape, together with audio recording, requires a separate device. The recording of code on archive images cannot be practically performed in a large number of phonograms. Likewise, it would be difficult to equip reportage tape recorders, but also the currently used studio machines with a hereditary coding device. No known system has so far been able to make a direct selective transcription of an audio recording from a cassette recorder if it is necessary to select a recording of audio phenomena with very short gaps of several milliseconds.

The above-mentioned drawbacks are solved by a device for editing audio recordings by electronic editing, especially in the implementation of selective transcription of audio recordings on tape recorders according to the invention, characterized in that the audio source is connected recording tape recorder through electronically controllable attenuator. a control unit for selecting a word or other audio signal to be followed by editing the audio record, the moment of editing being determined by a pulse from the modulation gap analyzer which analyzes the audio signal from the audio source. The moment of editing is realized by a damping element, which dampens the recorded signal with the control pulse from the analyzer, thus preventing further recording of the record and, while moving the tape, at the same time ensures deletion of the old record by the lubricating head connected. After passing the set time, the wrong walk of the tape recorder automatically turns on, the tape moves to sleep until the end of the recorded last word bow to the reproducing head. The electrical signal generated in the reproducing head after passing through the amplifier, rectifier, comparator and electronic switch stops the tape movement. The recorder is thus ready to receive the next resume of the recording. Continued recording is done similarly. By listening to the audio source, the control unit selects the word or audio that should be followed by the recording. At the same time, the motion controller PLAY turns on and the subsequent modulation gap analyzer instructs the recorder to turn on RECORD, which happens when the tape is already at the nominal motion speed, so that recording cannot be distorted.

By using its own audio signal as a control medium, high precision electronic shear control is achieved when recording audio, since the output signals from the modulation gap analyzer are fixed to the audio signal. There is no need to record auxiliary signals, adjust the audio source or recorder. A non-erased tape can be used for the sample, as the old record is also erased at the cut point. Since the device makes it possible to make cuts in places where the spaces between words are only a hint of milliseconds, i. from. in fluent speech, no editing is required mechanically, - with scissors, which is a substantial benefit in reducing tape consumption. Significantly reduced laboriousness compared to mechanical cutting, there is no need to locate the cutting place by manual way by moving the tape in. in both directions while listening, which is not only time-consuming, but also mentally demanding and tiring. Furthermore, the gluing of the tape is eliminated and, after the entire operation has been completed, the recording is recorded on the uncut tape for broadcasting purposes where the glued tape is not to be used. An essential benefit of the application of the invention is that the device enables direct selective transcription of the cassette recorder without having to play the record at a higher speed onto a disc or reel tape recorder, which requires mechanical editing. Another advantage is that the primary recording remains intact for further use.

The device allows shifting the order not only of the whole flight, but also of individual words, which allows the editor, who himself carries out the whole operation without the help of a technician, edit the resulting image even in several variations and eavesdropping to choose the most appropriate combination. The device includes automatic switching of the tapping before and behind the belt, which allows immediate control of the cleanliness of the cut design.

The figure shows a block diagram of the individual functional parts of the device. To audio source 1, e.g. the cassette recorder is a modulating link connected to a recording tape recorder 2 via an electronically controllable damping element 3, realized e.g. electronic switch based on MOSFET in integrated form. The damping member 3 is connected to a modulation gap analyzer 4, e.g. using a rectifier, integration elements and a comparator, it evaluates the modulation gaps in the audio signal. The damping element 3 is actuated by the pulse from the evaluated gaps following the activation of the control on the control unit 5 in the word selected by the operator by listening to the audio source 1 by means of the monitoring monitor 6. The recording head 8 does not receive the audio signal from the audio source 1. however, the tape 11 moves further and the lubrication head deletes the old record on the tape 11. After a specified time, the control unit 5 sends a pulse for the wrong operation of the recording tape recorder 2. The tape 11 moves in the opposite direction. The control unit 5 then automatically connects the reproducing head 9 to the electronic unit 7, which evaluates the end signal of the last recorded word on the tape 11 as a control pulse for the STOP function and the tape 11 stops moving. The recorder is thus ready for further recording, with the necessary portion of the tape 11 being erased. The listening monitor 6 may be either an amplifier speaker or hearing aids. To resume recording after skipping an unnecessary portion of the audio signal from source 1, the operator selects the word, or other audio signal, and actuates the recorder 2 in the PLAY function by pressing the control on the control unit 5 and simultaneously switches the monitor 6 to the head 9 Then, the modulation gap analyzer 4 evaluates the subsequent gap in the modulation signal and connects the recording tape recorder 2 to the RECORD function via the control unit. The operator will assess the start of the recording, its cleanliness and the balance of the end-of-record level and the beginning of the recording, which can be adjusted by the controller 12 as needed. By selecting the PLAY start torque, the gap width between the end of the previous and the start of the new recording can be changed to a certain extent, with the purity and accuracy of the cut being determined by the pulse from the modulation gap analyzer. The orientation for selecting the gap width is given by the fact that when you turn on PLAY, the monitor monitor interconnects, thus interrupting the listening to the audio source 1 and the operator knows what change to turn on when the gap width needs to be adjusted.

Claims (2)

An apparatus for treating audio recordings by electronic editing, in particular in the implementation of selective transcription of audio recordings on tape recorders, characterized in that a recording tape recorder (2) is connected to the sound source (1) via an electronically controllable damping element (3) to create a functional artificial modulation a gap that is connected via a modulation gap analyzer (4) to a control unit (5) to select a sound to be heard from the monitor (6), and the gap gap analyzer (4) to evaluate the subsequent modulation gap determining the moment of electronic shear is connected to audio source (1). 2. A recording apparatus according to claim 1, characterized in that the reproducing head (9) of the tape recorder (2) is connectable to an electronic evaluating member (7) for generating a stop pulse by its own recorded signal when the tape (11) recording tape recorder (2).