JPS61211857A - Signal recorder for random access in pcm recorder - Google Patents

Abstract

PURPOSE:To improve the operability by constituting the titled device of a comparator means for comparing respectively an input audio signal to be recorded with a reference level, an inter-music flag set means and a number code setting means to record automatically a random access signal comprising an inter-music flag and a music number code. CONSTITUTION:While an audio signal incoming to an input terminal 1 is fed to an A/D converter 2, the signal is fed to a level comparator 13, where the signal is compared with a preset reference level and the result is converted into a binary signal depending on the quantity. A music number counter 14 adds and counts only the leading edge of the binary signal from the level comparator 13 or the trailing edge only to output a music number code whose value is increased by 1 each. A output modulated wave form an auxiliary signal generation and modulator 15 forms other auxiliary signal recording track by a fixed magnetic head 16 than n sets of parallel tracks formed by heads 6-1-6-n. Thus, a random access signal is recorded automatically on the auxiliary signal recording track.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a random access signal recording device for a PCM recorder, which determines whether a program is in progress (during a song) or a program interval (between songs). A random access signal consisting of a load (in-song flag) and a program number code (song number code) is digitally recorded on the recording medium at the same time as the audio signal, and the random access signal can also be read during high-speed fast forwarding and high-speed rewinding. P that can be regenerated
This invention relates to a random access signal recording device for a CM recorder.

Conventional technologyCurrently, for the purpose of higher quality audio signal transmission,
P obtained by pulse code modulation (PCM) of the audio signal
2. Description of the Related Art PCM recorders that record CM audio signals on magnetic tape using magnetic heads are actively being developed. There are currently two types of PCM recorders: a fixed multi-head type (hereinafter referred to as fixed head type) that uses a fixed multi-track head as the magnetic head, and a rotating head type that uses a rotating head. . FIG. 19 shows a block system diagram of an example of a conventional fixed head type PCM recorder. In the figure, an audio signal input to an input terminal 1 is supplied to an A/D converter 2, where it is sampled and quantized and converted into a C digital signal, and then converted to an encoder 3.
The signal is supplied to the data multiplexer 4, where it is encoded, etc., and then supplied to the data multiplexer 4. The PCM audio signal is distributed and recorded on 0 multi-tracks in order to obtain the required transmission rate 1 to n.
The block signals are distributed and supplied to the block signal generation/modulators 5-1 to 5-n, where the block signals are added with synchronization signals, parity, etc., and then modulated using a predetermined modulation method. and then supplied to the fixed heads 6-1 to 6-n. As a result, zero parallel disks are simultaneously recorded on the magnetic tape (not shown) along the longitudinal direction of the tape.

In order to perform high-speed random access in such a fixed head type PCM recorder, high-speed fast forward (hereinafter referred to as F) or high-speed rewind (hereinafter referred to as REW) is used, but generally when FF or REW is used, the number of times during normal playback is Since the tape running speed is approximately 10 times faster, it is possible to read the digital signal even if the tape running speed changes drastically. number code) is recorded on an auxiliary signal track that is installed separately from the audio signal recording track.

On the other hand, since the modulation method of the PCM audio signal is selected for the purpose of high recording density, it is impossible to read it during FF and REW.

As a modulation method for the random address signal, for example, a pi-phase mark modulation method is often used.

As shown in FIG. 20, the signal waveform modulated by this modulation method always inverts the polarity at the beginning of the bit period T, and
It is a pulse train that inverts the polarity even at the middle position of the bit period T only when the data is '1'', so there are only two types of signal inversion intervals: 1T and 0.5T.As a result, the playback speed changes significantly. However, by measuring the inversion interval using a high-frequency clock, calculating the playback speed at that time, and generating a pulse train reading clock (a clock with a frequency twice the bit rate at that speed), you can use that. It is possible to demodulate the data.

FIG. 21 shows a block system diagram of an example of a conventional rotating head type PCM recorder. In the figure, the Δ-D A signal 1. which enters the human power 921 child 1. After being converted into a digital signal by the A/D converter 8, it is supplied to the encoder 9, where synchronization signal, parity, etc. are added, and the random access signal is also added. After being converted into one block of signals, they are passed through a modulator 10 to a rotary head 11a,
llb, respectively.

In addition, on the magnetic tape (not shown in the figure), a 1-rack inclined with respect to the longitudinal direction of the tape is mounted on the rotating head 11a.
and 11b are recorded sequentially and sequentially. Digital signals synthesized in block units in a time-series manner are recorded in each of the blocks 1 to B7, as schematically shown at 81 to B7 in FIG. In Fig. 23, 5YNC is placed at the beginning position of the 1 block signal.
AUX is an auxiliary signal that includes the above-mentioned song flag, song number code, etc., P is a parity for checking errors in the auxiliary signal, and the remaining part contains PCM data and its parity. is placed.

In such a rotary head type PCM recorder, in order to perform high-speed random access, when FF and RFW are performed while the magnetic tape is loaded on the rotary head drum, the rotary heads 11a and 1 are at similar azimuth angles to each other.
1b, when scanning a rack pattern to record 1 without a guard band as shown at 11 to t6 in FIG.
As shown in 13, it crosses multiple tracks,
During the scanning period of a track recorded with a rotary head with an azimuth angle different from that of the self, the signal level decreases significantly, and the diagonal line in Fig. 24 (A) recorded with a rotary head with the same azimuth angle as the self. It is well known that since the RF multiplied signal can be reproduced at a predetermined high level only during the 1 to easy partial scanning period, the reproduced RF signal waveform will be as shown in FIG. 24(B). Therefore, although it is impossible to reproduce PCM audio signals, it is possible to read some signals.

FF of 4T, rotating head type PCM recorder.

During REW, the change in the relative linear velocity between the tape and head is less noticeable than during normal playback, and as shown in FIG. If the period during which the reproduced RF signal level is normal is approximately 2 blocks, it will take 0.5 seconds for the phase-locked loop (PLi) for data demodulation to lock in. Assuming that it takes about 1.5 blocks, it is possible to read a signal of about 1.5 blocks.The PCM audio A signal itself cannot be reproduced correctly unless it continuously reads a signal string of about 100 blocks per track. It is impossible to play the signal from 1.5 blocks (), but the data for the song flag and song number code is about 10 bits and 1. Figure 23 shows the S''/NC, AUX and Since the total number of bits of each signal indicated by P is about 10 bits, it is possible to read it.Also, since the drum rotation speed is about 30 rpS, in the case of 2-head azimuth recording, it is possible to Since the signal is recorded with a length of about 17m5ec, the song flag and song number code will be the same data for more than a few dozen tracks, so there is no need to record it in all blocks of each track, for example, in 8 blocks. The above-mentioned in-song flag and song number code (random access signal) may be recorded at the rate of one trace.In the reproduced RF signal with the waveform shown in FIG. 24(B), there are about ten of them. It is sufficient if the random access signal can be read even from one of the playback periods at a substantially normal level ().

Problems to be Solved by the Invention However, in the conventional PCIv'l recorder, the method for recording the random access signal is to first record the time code together with the PCM audio signal, and then play back the recorded magnetic tape. While listening to the reproduced audio signal obtained through the process, a human determines whether it is during a song or between songs, as well as the song number, and then generates a mid-song flag and song number code based on the playback time code for fixed head PCM recording. Audio A on the machine
They were recorded later on a track that was set up separately from the signal recording track, and in rotary head type PCM recorders, they were inserted into the block signal when dubbing and recording. For this reason, conventionally there have been problems such as extremely complicated and time-consuming recording of random access signals.

Therefore, the present invention sets the in-song flag to 10 based on the result obtained by comparing the input audio signal level with the set reference level.
'' or ``1'' and increasing the value of the song number code by 11'', thereby providing a signal recording device for random access in a PCM recorder that solves the above problems.

Means for Solving the Problems The present invention comprises comparison means for comparing levels of an input audio signal to be recorded and a reference level, an in-song flag setting means, and a number code setting means. The in-song flag setting means selects rOJ or "
The in-song flag with a value of 1 is obtained. Further, the number code setting means obtains a number code by increasing the value of the number code by "1" only when a predetermined output signal is supplied from the comparison means.

Operation: The in-song flag setting means obtains an in-song flag of "1" or rOJ based on the output signal of the comparison means obtained when the input audio signal becomes lower than the reference level. Since the in-song flag of "0" or "1" is obtained based on the output signal of the comparison means obtained when the in-song flag is reached, the in-song flag can be automatically obtained.

Further, the number code setting means can also automatically increase the value of the number code by "1" in response to a signal having a predetermined logical value among the output signals of the comparison means. Each embodiment of the present invention will be described below with reference to FIGS. 1 to 18.

Embodiment FIG. 1 shows a block system diagram of a first embodiment of the apparatus of the present invention. In the figure, the same components as those in FIG. 19 are denoted by the same reference numerals, and the explanation thereof will be omitted. The audio signal that has entered the input terminal 1 is supplied to the A/D converter 2, and is also supplied to the level comparator 13, where the level is compared with a preset reference level as described later, and the magnitude relationship is determined. It is converted into a binary signal accordingly. The song number counter 14 adds up only the rising edge or only the falling edge of the binary signal from the level comparator 13, and outputs a song number code whose value increases by "1". Therefore, the song number counter 14
For example, if the configuration is such that only the rising edge of the output binary signal of the level comparator 13 is counted, no counting is performed when a falling edge arrives, and when a rising edge arrives, the value is higher than the previous value. Outputs a song number code with a value incremented by 1.

The auxiliary signal generator/modulator 15 is supplied with the logical value of the output signal of the level comparator 13 and the counted value (music number code) from the tune number counter 14, respectively, and is used for random access consisting of a mid-song flag and a tune number code. After generating the auxiliary signal including the signal, it is subjected to, for example, the biphase mark modulation so that it can be read even during FF and REW. The output modulated wave of the auxiliary signal generation/modulator 15 is recorded by a fixed magnetic head 16 to form an auxiliary signal recording track different from the zero parallel tracks recorded and formed by the heads 6-1 to 5-n. Therefore, the random access signal is automatically recorded on the auxiliary signal recording track.

FIG. 2 shows a block system diagram of a second embodiment of the device of the present invention. In the figure, the same components as in FIG. 1 or FIG. 21 are designated by the same reference numerals, and their explanations will be omitted. Level comparator 13
The output binary signal and the output count value of the music number counter 14 are respectively supplied to an encoder 18, where the auxiliary signal in the block signal shown in FIG. 23 is generated. Encoder 18
generates the block signal shown in FIG. 23, but according to this embodiment, the auxiliary signal therein can be automatically generated and recorded without reproducing the recorded magnetic tape. become.

Next, each embodiment of the level comparator 13 will be described. FIG. 3 shows a block diagram of a first embodiment 13a of the level comparator 13. In the figure, the two-channel audio signals input to the input terminals 20a and 20b are mixed through mixing resistors 21a and 211), and then envelope-detected by the envelope detector 22, as shown in FIG. In A), the detection signal shown by ``■'' is used as a detected signal, and is further supplied to the non-inverting input terminal of the comparator 23. Comparator 2
A reference voltage at a constant level as shown by the broken line ■ in FIG. 6(A) is supplied to the inverting input terminal of No. 3 through the terminal 24.

As a result, as shown in FIG. 6(B), the comparator 23 is at a low level (rOJ
) is output to the output terminal 25.

FIG. 4 shows a circuit diagram of a second embodiment 13b of the level comparator 13. In the figure, the same reference numerals are given to the same parts as in FIG. 3, and the explanation thereof will be omitted.

In FIG. 4, a detection signal as shown by ■ in FIG. applied to the input terminal,
The level is compared with the first reference voltage indicated by the broken line (■) in FIG. 8(A), and a signal as shown in FIG. 8(B) is obtained. The output signal of the comparator 27 is integrated by an integrator 29 to produce a signal as shown in FIG. The level is compared with a second reference voltage shown by a broken line V in FIG. 8(C), which is applied to the non-inverting input terminal. As a result, from the comparator 30, as shown in FIG.
A signal as shown in FIG. 8(E) and FIG. After being made into a signal as shown in FIG. 6(C), it is output to the output terminal 34. According to this embodiment, the input audio signal becomes smaller than the first reference voltage when the period in which the input audio signal becomes smaller than the first reference voltage continues for a preset time T+ or more. A low level signal indicating this is output to the output j terminal 34. As a result, even if the level of the audio signal momentarily decreases during a song, it is possible to prevent this from being erroneously detected, and the detection between songs can be made more accurately.

FIG. 5 shows a circuit diagram of a third embodiment 13c of the level comparator 13. In the figure, the same components as those in FIG. 4 are denoted by the same reference numerals, and the explanation thereof will be omitted.

In FIG. 5, the output signal of the comparator 7 is supplied to one input terminal of a two-way NOR circuit 36, while being supplied to a monomulti 37, which is triggered by its rising edge. As a result, a high-level pulse is extracted from the Q output terminal of the monomulti 37 for a fixed period T3 from one trigger point and is applied to the other input terminal of the NOR circuit 36. As a result, the NOR circuit 36 outputs a signal at the frontage level of the period T3 to the output terminal 38 as shown in FIG. When this occurs, a low-level signal will continue to be output for a preset period of time T3 or more, so even if the input audio signal becomes equal to or higher than the reference voltage within period T3, the signal will continue to be output during period T2. This makes it possible to detect the in-song flag more reliably even if the reproduced RF signal periodically drops significantly, such as during random access in a rotary head type PCM recorder.

FIG. 7 shows a circuit system diagram of a fourth embodiment 13 (1) of the level comparator 13. In the figure, the same components as those in FIG.

In FIG. 7, the signal shown in FIG. 8(E) taken out from the OR circuit 32 is applied to the monomulti 40 to trigger it at a falling edge. As a result, as shown in FIG. 8(F), a low-level signal is extracted from the σ output terminal of the monomulti 40 for a certain period of time from the trigger point and is supplied to the AND circuit 41, where it is output from the OR circuit 32. After being ANDed with the signal to obtain a signal as shown in FIG. This embodiment is a combination of both the embodiments shown in FIGS. 4 and 5.

FIG. 9 shows a block system diagram of a third embodiment of the mounting according to the present invention. In the figure, the same components as in Figure 2 are designated by the same symbols.
The explanation of C and B will be omitted. The output digital signal of the A/D converter 8 is supplied to the mid-song/between-song discriminator/14, where it is compared in level with the MH digital value and converted into a binary signal according to the magnitude relationship. After being converted, it is output to the song number counter 45 and encoder 18. Song number J〕
The counter 45 operates in the same way as the song number counter 14.

FIG. 10 shows a circuit diagram of a first embodiment 44a of the mid-song/between-song discriminator 44. In the same figure, input terminal i6a, 4.51
The two channels of audio signals input to the terminal 1 are converted into digital signals for each channel by the A/D converter 8, and then supplied to digital comparators/17 and 48, respectively, where the reference level from the terminal 49 is - The value is compared with the digital signal 1 for each channel, and when the value is smaller than the reference digital value, it is converted to a low level signal, and when it is a human signal, it is converted to a high level signal. Each output signal of the digital comparators 47 and 48 is outputted to an output terminal 51 through an OR circuit 50. This embodiment differs only in that the digital signals are compared with each other, and similarly to the level comparator 13a shown in FIG. 4, it outputs a signal as shown in FIG. 6(B) to the output terminal 51. I can do it.

FIG. 11 shows a circuit diagram of a second embodiment of the mid-music/between-music discriminator 4/Ib. In the figure, the same components as those in FIG. 10 are denoted by the same reference numerals, and the explanation thereof will be omitted. OR circuit 50
The output signal of is applied to the clear terminal of the counter 52.

The counter 52 is cleared while a high level signal is applied to its clear terminal, and is not cleared when a low level signal is applied.

On the other hand, since the output signal of the OR circuit 50 is at a low level during the period in which the digital value of the input audio signal is smaller than the reference digital value, the counter 52 only receives the one-no-one ringing frequency input via the terminal 53 during this period. 1 count of clock pulses equal to .

Then, when 271 clock pulses have been counted, a high level signal is taken out from the output terminal C)+n of the counter 52, and after the polarity of this signal is inverted by the inverter 54, it is output to the output child 55. Applied to the terminal.

According to this embodiment, if the period in which the digital value of the input audio signal is -b smaller than the reference digital value continues for a certain period of time required for the counter 52 to count 2T1 clock pulses, Then, it is possible to digitally generate a signal that resets the in-song flag when the predetermined period of time has elapsed.

Next, embodiments for flagging the recording/coating signal during a song will be described with reference to FIGS. 12 and 13. 1st
In Figure 2, the input terminal 20a.

The two channels of A-to-A signals entering 20b are separately supplied to mini-linking circuits 61 and 62.

On the other hand, the input terminal 57 receives, for example, a high level signal when it is desired to mute the audio signal during recording, and a low level signal when not muting the audio signal, and is supplied to the muting circuits 61 and 62 to control their operations. , is outputted to the output terminal 58 and also supplied to the song number counter 59. In this embodiment, a person listens to a song by monitoring and reproducing an audio signal to be recorded, and when a switch called a recording mute is operated at the end of the song, a high-level recording muting signal is sent to the input terminal 57. is input, and this is output to the output terminal 58 as an in-song flag, while the muting circuits 61 and 62 are operated to block signal transmission to the A/D converter 2■, thereby recording inter-song noise, etc. To prevent. Further, the recording muting signal is supplied to a song number counter 59,
Here, the value is incremented by 4 and the value increased by "1" from the previous value is outputted to the output terminal 60 as the song number code.

FIG. 13 shows an embodiment in which muting is performed on digital signals, and the output digital signal of A/D converter 2 (8) is applied to one input terminal of each of AND circuits 65 and 66. On the other hand, when a high-level recording muting signal is input to the input terminal 57 in the same manner as described above, the recording muting signal outputted by the low level is transmitted to the AND circuit 65 and the inverter 6/I. 66 is applied to the other input terminal to return these to the goo 1 to [closed 1 state.
68 to the N A N l) circuit 69;
Furthermore, the signal S output from this to the output terminal 70 becomes low level (logic "O"). The signal output to the output terminal 70 is used as a mid-song flag.

Next, the relationship between the song flag and the song number code will be explained. The song number counters 1/I and /15°59 are configured to cover only one of the rising edge and the rising F edge of the input signal by the number hl.

Therefore, the song number counter l/l, 45.59, stands.
[Assuming that 4 counts are performed when Fuji enters, if the mid-song flag changes as shown in Figure 17'1 (A>), the value of the song number code will change as shown in Figure 17'1 (B). When the song number is in between, the song number increases by 111. On the other hand, the song number counter 1/
1. If the in-song flag changes as shown in Fig. 15 (A), the value of the song number code will change as shown in Fig. 15 (B). ), the song number increases by "1" each time the song enters the song.

Next, additional records of the device of the present invention will be explained.
As schematically shown in Fig. 6, audio signals up to the track number N indicated by diagonal lines have already been recorded on the magnetic tape F.
When newly recording an audio signal from the last recording position of the audio signal of song number N, play back the point immediately before the additional recording, read that the song number code value is Nc, and score 0 points. At the time when , recording is started and the music number code having the value of N+1 is recorded. After the recording starts, as described above, each time a song interval is detected, the song number code is automatically recorded as a value incremented by 11.

Next, to explain the correction record of the device of the present invention, the 17th
As shown schematically with diagonal lines in Figure (A), the song numbers N, N+
1. Correction recording in which the last point 0 of the song number N is erased from the recorded magnetic tape on which audio signals II to 2, etc. have already been recorded, and a new audio A signal is recorded from point 0. Before starting recording, the loading platform also plays back the part immediately before 1 Umazu ■ Tei, reads the value N of the song number code of that rank, and then returns to the recording mode when the magnetic tape reaches the 0 point.

After recording starts, the read song number code value N is set to 11.
” (generate and record the song number code of Ia,
Thereafter, each time a song interval is detected, the value of the song number code is automatically increased by "1".

Next, the song number code generation circuit and the like in the case of the above-mentioned additional recording and corrected recording will be explained with reference to FIG. 18. In the figure, the value obtained by reproducing the recorded edge number code immediately before the recording start point (point 0) is supplied to the register 73 via the terminal 72 and stored therein. Next, when the magnetic tape reaches the recording start point, the recording mode is switched and at the same time, a recording start pulse is input to the terminal 74. This recording start pulse is OR
The signal is applied to a clock terminal of a music number counter 76 through a circuit 75. Since the output value of the register 73 has been accessed from 1 to the music number counter 76 before the start of recording,
When the recording start pulse enters the clock terminal, a value obtained by adding 11 to the access value is generated, which is outputted to the output terminal 77 as a song number code and recorded.

After the start of recording, the level comparator 78 (this is the level comparator 13.13a to 13c described above, the mid-song/between-song discriminator 44)
44a, 44b) outputs the inter-song (in-song) detection pulse jJj' taken out every time the inter-song detection is performed as described above to the output terminal 79 as an in-song flag.
Since the signal is applied to the clock terminal of the song number counter 76 through the R circuit 75, a song number code whose value is automatically increased by "1" is taken out.

Effects of the Invention As described above, according to the present invention, a random access signal consisting of a song flag and a song number code can be automatically recorded, thereby eliminating the need for operations for recording a random access signal compared to the prior art. This allows for improved operability, and also because the period in which the audio signal to be recorded has been lower than the reference level continues for a certain period of time, and the -C mid-song flag is set to the inter-song detection value - 26=. , even if the A-dio signal is a song that can be stepped on momentarily, it can be prevented from being mistakenly detected as an inter-song interval. Since flags are recorded continuously over a certain period of time, for example, when a rotating head type PCM recorder is used for random access, the playback rotating head can record tracks with different azimuth angles. Even if there is a continuous drop in the playback RF signal level caused by alternately crossing tracks recorded by a rotating head with the same azimuth angle, the mid-song flag can be reliably read, and the recording mute switch can be Random access signals can be recorded depending on the presence or absence of operation, and even in the case of additional recording or correction recording, the song number code of the audio signal after recording starts is automatically set to the correct value following the previous song number code. It has a number of features, such as being able to record data visually.

[Brief explanation of the drawing]

1, 2, and 9 are block diagrams, FIG. 3, and FIG. 4, respectively, showing respective embodiments of the apparatus of the present invention. 5 and 7 are block system diagrams or circuit system diagrams showing respective embodiments of the level comparator in the device of the present invention, and FIGS. 6 and 8 respectively show the operation of the level comparator in the device of the present invention. An explanatory signal waveform diagram, FIGS. 10 and 11 are circuit system diagrams showing respective embodiments of the in-song/between-song discriminator in the block system shown in FIG. A block system diagram and a circuit system diagram showing other embodiments of the main part of the inventive device, FIGS. 14 and 15 respectively show each side of the relationship between the change in the candy of the mid-song flag and the change in the value of the music number code. A diagram explaining
Fig. 16 is a diagram explaining how to record the song number code during additional recording, Fig. 17 is a diagram explaining how to record the song number code during correction recording, and Fig. 18 is a diagram explaining how to record the song number code during additional recording and correction recording. 19 and 21 are block diagrams showing each side of a conventional PCM recorder, and FIG. A diagram showing an example of a phase mark modulated signal waveform, FIG. 22 is a diagram schematically showing a signal recorded on one track by a rotating head type PCM recorder, and FIG. 23 is a diagram showing the signal shown in FIG. 22. 24(A) is a diagram showing an outline of the signal format of one block of FIG. 24(A). FIG. 24(B) is a diagram showing a head scanning locus and a reproduced RF signal waveform during random access of a rotating head type PCM recorder. 1 .7.20a, 20b, 46a, 46b...
・Audio signal input, 2, 8...A/D converter, 5-1 to 5-n...Block signal generation/modulator,
6-1 to 6-0...fixed head, 10...modulator,
11a. 111)--Rotating head, 13.13a to 13c. 78... Level comparator, 14.45.59... Song number counter, 15... Auxiliary signal generation/modulator, 16.
...Magnetic head, 18...Encoder, 22...Envelope detector, 23.27.30...Comparator, 24.28.31...Reference voltage input terminal, 29...
・Integrator, 37.40...Mono multi, 44.44a
. 4411...In-song/between-songs discriminator, 47.4.8...
Gauge digital comparator, 52... counter, 57.
...Record muting signal input terminal, 72...Playback song number code input terminal, 73...Register, 74...
- Recording start pulse input terminal.

Claims (5)

[Claims] (1) Random access in a PCM recorder that digitally records a random access signal consisting of an in-song flag that determines whether a program is in progress or a program interval and a number code that indicates a program number onto a recording medium at the same time as an audio signal. An access signal recording device,
Comparing means for comparing the levels of the input audio signal to be recorded and a reference level, and setting the mid-song flag to "1" when the output signal of the comparing means is supplied and the input audio signal exceeds the reference level. or "0" and sets the mid-song flag to "0" or "1" when the input audio signal becomes lower than the reference level; and a number code setting means that increases the value of the number code by "1" only when an output signal of the comparison means is supplied which sets the value to a predetermined value of either one of "1" and "1". PCM with
A signal recording device for random access in a recorder. (2) The comparison means determines that the input audio signal has become lower than the reference level when the period in which the input audio signal has been lower than the reference level continues for a set first time period or more. 2. A random access signal recording device for a PCM recorder according to claim 1, characterized in that said signal recording device is configured to generate and output a signal representing a random access signal in a PCM recorder. (3) The comparing means indicates that when the input audio signal becomes lower than the reference level, the input audio signal continues to be lower than the reference level for a set second time period or more. A PC according to claim 1 or 2, characterized in that the PC is configured to continuously generate and output a signal.
Random access signal recording device for M recorder. (4) A patent claim in which the in-song flag setting means sets the in-song flag to a value indicating a program interval when a muting signal that operates a muting circuit provided in a transmission system for the input audio signal is received. A random access signal recording device for a PCM recorder according to item 1. (5) The number code setting means includes a storage means for reproducing the recorded recording medium and storing the recorded number code immediately before the part to be added or corrected, and a record for starting the additional recording or correction recording. Claims 1 to 4 include means for outputting a value obtained by adding "1" to the output code value of the storage means as the number code when a start pulse is received. A signal recording device for random access in a PCM recorder according to any one of the items.