JPS61168190A - Device for recording and reproducing audio signal - Google Patents

Abstract

PURPOSE:To obtain a reproducing device which facilitates recording signal identification by generating information at the time of the detection of a no- sound part of an audio input and recording it on a medium together, and performing traveling control with information on a reproduced no-sound part. CONSTITUTION:Information DA recording a specified record start part is supplied and when it coincides with the counted value of a counter 84, a capstan is controlled through a monostable multivibrator MM86. When the audio signal after PCM processing enters a no-sound part, an MM157 is triggered, outputs of comparing circuits 158 and 159 fall to L at specific timing, and the output of an AND gate 161 is inverted to H; and an AND gate 163 supplies pulses of an MM160 to a counter 165, which generates a Q output H after counting up continuously to control the capstan, stopping the tape. The counter 165 is reset by an inverter 162 and an AND gate 164 and when an MM167 and an OR gate 166 detect that once, the counter 165 does not operate a while. Consequently, an audio signal recording and reproducing device which easily identifies a recording signal by heat black detection is obtained.

Description

TECHNICAL FIELD The present invention relates to an audio signal recording and reproducing apparatus, and more particularly to an audio signal recording and reproducing apparatus equipped with a recorded audio signal identification function.

(Description of the Prior Art) Conventionally, various identification functions have been added to audio signal recording and reproducing devices.Especially, recording devices that are capable of long-time recording and high-quality audio signal recording have been added. In some cases, a cueing function is necessary.

Conventionally, the method of cueing in an audio tape recorder is to run the tape at a speed several to several tens of times faster than the recording speed, and detect silent parts of the audio signal being played back. was.

On the other hand, in recent years, as the sound quality of audio signals has improved, various methods have been proposed for recording audio signals using a rotating head. For example, FM modulation recording using a rotary head is known as audio conversion in a video tape recorder, and digital modulation recording using a rotary head is known as an audio-only device.

Additionally, in response to this, an audio recorder has been devised that compresses the time axis of an audio signal and records it with digital modulation.

An example of an audio tape recorder that uses a rotary head to time-base compress an audio signal and record it with digital modulation will be briefly described below.

FIG. 1 is a diagram showing an example of a tape running system of a conventional audio tape recorder of this type. In Figure 1, l
2 is a magnetic tape, and 2 is a rotating cylinder that holds a rotating head 3.4. As a result, the heads 3 and 4 trace the tape l diagonally and record audio signals. Then, each time the head 3.4 rotates 36 inches, a time-axis compressed audio signal is recorded in each of the six areas formed in the longitudinal direction of the tape 1, so that a total of six channels of audio signals can be recorded. You can get a dedicated tape recorder.

This tape recorder will be briefly explained below. FIG. 1 is a diagram showing the tape running system of the above-mentioned tape recorder, and FIG. 2 is a diagram showing the recording locus on the tape by this tape recorder.

In Figure 2, CHI to CH6 are traced by Head 3 or Head 4, respectively, from A to B, B to C, C to D, D to E, E to F, and F to G in Figure 1. This is the area where audio signals are recorded during the period. Audio signals can be recorded on each side of each area, and so-called azimuth overwriting is performed in each area, but the tracks in each area CHI to CH6 do not need to be on the same straight line. In addition, pilot signals for tracking control are recorded in each area, but it is assumed that they are recorded in a predetermined rotation (f+ → f2 → f3 → fq) for each area, and there is no correlation between the areas. do not have.

Also, the areas indicated by CHI to CH3 are the areas indicated by tape l in FIG.
Recording and reproduction are performed when the vehicle is traveling at a predetermined speed in the direction shown by arrow 7, and recording and reproduction is performed in the area indicated by CH2-CH2 when it is also traveling in the direction shown by arrow 9. Therefore, the second
As shown in the figure, the inclination of each track in the area indicated by CHI-CH3 and the inclination of each track in the area indicated by CH2-CH2 are slightly different. However, regarding the difference in relative speed at this time, the difference due to the running of the tape 1 is extremely small compared to the difference due to the rotation of the heads 3 and 4, so it does not pose a problem.

FIG. 3 is a time chart of recording and reproduction of the tape recorder as described above. In the figure, (a) is a phase detection pulse (hereinafter referred to as PG) generated in synchronization with the rotation of cylinder 2, which is l/6
It is a 30Hz square wave that repeats "high level (H)" and "low level (L)" in 0 seconds. Also, (b) is a PG
Dispense with PG of opposite polarity to (a). Here, PG (a) is H, PG (a) while the head 3 rotates from B to G in FIG.
b) is assumed to be H while the head 4 similarly rotates from B to G.

Figure 3 (C) shows the data reading pulse obtained from PG (a), which corresponds to one field of the video signal (1760 seconds).
This is for sampling the audio signal of the period corresponding to every other field. In FIG. 3(d), H indicates a signal processing period for adding a redundant code for error correction or changing the arrangement of the sampled audio data for l'inired using a RAM or the like.

In FIG. 3(e), the period of data recording is indicated by H, and the timing at which the recording data obtained by the above-mentioned signal processing is recorded on the tape 1 is indicated.

For example, if we follow the flow of the signal in time using Fig. 3, t
The data sampled during the period l-t3 (while head 3 is moving from B to G) is from t3 to t5 (head 3 is moving from G to A)
Signal processing is performed at t5 to t6 (head 3 is A-B)
recorded over a period of That is, the head 3 causes C in FIG.
Recorded in the HI area. On the other hand, data sampled while PG (b) is H is signal-processed at the same timing and recorded in the CHI area by the head 4.

PG (a) at a predetermined phase (here, 36° for one region)
The phase-shifted PG is shown in FIG. 3(f).

Hereinafter, a case will be described in which an audio signal is recorded using PG (f) and a PG (not shown) having the opposite characteristics.

The data sampled from t2 to t4 in FIG.
The signal is processed according to the signal shown in FIG. 3(g) during the period from t6 to t6, and recorded according to the signal shown in FIG. 3(h) during the period from t6 to t7.

That is, data is recorded by the head 3 in the area indicated by CH2 in FIG. 2 during the period when the head 3 traces B-C. The data sampled during the period t4 to t7 is recorded by the head 4 in the area indicated by CH2.

Next, the operation of reproducing the signal recorded in the area indicated by CH2 will be explained.

Reading of data from tape 1 by head 3 is shown in FIG.
t6 to t7 (same for tl to t2) according to the signal shown in h)
t7 to t8 (
From t2 to t3), signal processing opposite to that during recording is performed. That is, error correction and the like are performed during this period, and a reproduced audio signal is output from t8 to t9 (t3 to t6) in accordance with the signal shown in FIG. 3(j). Of course, the reproduction operation by the head 4 is performed with a phase difference of 180'' from the above-mentioned operation, so that a continuous reproduction audio signal can be obtained.

It goes without saying that for the other areas CH3 to CH6 as well, it is sufficient to phase PG(a) by nX36' and perform the above-mentioned recording and reproducing operation based on this.
Also, this does not depend on the running direction of the tape.

In this way, it has become possible to use the VTR as a dedicated audio device capable of long-time recording with multiple channels.

However, although this type of audio tape recorder can record for as long as 9 hours by recording 90 minutes for each area, it is still possible to quickly search for what is recorded on which part of the tape. It is difficult to do so.

In other words, when a tape as a recording medium is run at high speed,
The head cannot accurately trace the recording track. Therefore, a reproduced audio signal cannot be obtained from the PCM audio signal, and silent parts cannot be detected. Also, regarding the silent part, P corresponding to the information that there is no sound
A CM audio signal is recorded, and it is also impossible to detect the presence or absence of a recorded signal.

<Object of the Invention> The present invention has been made in view of the above-mentioned problems, and provides an audio signal recording and reproducing device that can easily identify audio signals recorded in any recording format. The purpose is to

(Explanation based on examples) The present invention will be explained below using examples.

FIG. 4 is a diagram showing a schematic configuration of a tape recorder as an embodiment of the present invention. Components in FIG. 4 that are similar to those in FIGS. 1 and 2 are given the same numbers.

The PG obtained from the rotation detection @11 of the rotary cylinder 2 is supplied to the cylinder motor control circuit 16, which rotates the cylinder 2 at a predetermined rotation speed and a predetermined rotation phase. 12.
13 is the flywheel 1 of the capstan 14 and 15 respectively
7.18 rotation detectors, the outputs (FG) of which are alternatively supplied to a capstan motor control circuit 20 via a switch 19. The output of the circuit 20 is supplied to each capstan motor via a switch 21 so that the capstan 14 or 15 rotates at a predetermined speed during recording. Switches 19 and 21 are connected to the F side in the figure when the tape is run in the direction shown by arrow 7 (forward direction), and to the R side in the figure when the tape is made to run in the direction shown by arrow 9 (reverse direction).

By manually operating the operation unit 24, operation modes such as recording and reproduction, and areas to be recorded and reproduced are specified. It is also specified whether to record exclusively for audio or whether to record video signals in the recording pattern shown in FIG. 2 as well.

These data are supplied to the system controller 25, which controls the capstan motor control circuit 20, the switch 19.21, the area designation circuit 26,
The gate circuit 27 further controls the capstan controller 53 and the like. Then, the area designation circuit 26 supplies the area designation data to the gate pulse generation circuit 23 to obtain a desired gate pulse. Incidentally, in the case where a video signal is also recorded, the designated area is naturally CHI.

The control gate pulses of the gate circuit 28 are determined based on the area designation data of the head 3. The aforementioned window pulses are selectively supplied to each of the heads 4.

During recording, the analog audio signal input from the terminal 29 is supplied to the PCM audio signal processing circuit 30, sampled at the above-described timing related to the window pulse, converted into digital data, and then subjected to the above-described signal processing. The recording audio data obtained in this way is sent from the pilot signal generation circuit 32 to f1→f for each field.
The adder 33 adds the tracking pilot signal generated in the rotation 2→f3→f4 and other pilot signals to be described later. The output of the adder 33 is appropriately gated by the gate circuit 28 as described above, and written into a desired area by the head 3.4.

During playback, the playback signal from the head 3.4 is similarly extracted by the gate circuit 28 using a window pulse, and this playback signal is passed through the A-side terminal of the switch 34 to the lobal filter (
LPF) 35 as well as the PCM audio circuit 30. In the PCM audio circuit 30, signal processing such as error correction, time axis expansion, and digital-to-analog conversion is performed in contrast to recording, and a reproduced analog audio signal is output from a terminal 36.

The LPF 35 separates the aforementioned tracking pilot signal and supplies it to the ATF circuit 37.

The ATF circuit 37 is a circuit for obtaining a tracking error signal using a well-known four-frequency method, and uses a reproduced tracking pilot signal and a pilot signal generated by the pilot signal generation circuit 32 in the same rotation as during recording. As is well known. However, when used as an audio-only device, a tracking error signal is obtained for each region, so this is sampled and held. The tracking error signal thus obtained is supplied to the capstan motor control circuit 20, which controls the running of the tape 1 during playback via the capstans 14 and 15 to perform tracking control.

Next, recording and reproduction of video signals will be explained.

When the system controller 25 issues a command to record and reproduce a video signal, the area designation circuit 26 is forced to
The HI region is designated and the gate circuit 27 is operated according to PG. The video signal inputted from the terminal 38 is converted into a signal form suitable for recording by the video signal processing circuit 39 and is supplied to the post-adder 40 . And adder 40
The signal is added to the pilot signal obtained from the pilot signal generation circuit 32 and sent to the head 3.4 via the gate circuit 27.
is recorded in areas CH2 to CH6. The recording operation of the PCM audio signal at this time is exactly the same as the recording operation described above for CHI.

During playback, video signals picked up by the heads 3 and 4 are converted into continuous signals via a gate circuit 27. This continuous signal is supplied to a video signal processing circuit 39,
The original signal form is output from the terminal 41. Also,
The continuous signal obtained from the gate circuit 27 is supplied to the LPF 35 via the V-side terminal of the switch 34.

The LPF 35 continuously separates pilot signal components and supplies them to the ATF circuit 37. At this time, ATF circuit 3
The tracking error signal obtained from 7 does not need to be sampled and held, and is supplied as is to the capstan motor control circuit 20. At this time, a PCM audio signal is also reproduced from the CHI area, and an analog audio reproduction signal is obtained from the terminal 36, but tracking control using the output signal of the gate circuit 28 is not performed.

Next, the cueing function of the tape recorder of this embodiment will be explained. FIG. 5 is a diagram showing a specific example of the structure of the cue control circuit 51 shown in FIG. 4, and FIG. 6 is a timing chart showing the waveform of the numbered part in FIG.

In FIG. 5, 61 is a terminal to which an L channel recording audio signal is supplied, and 62 is a terminal to which an R channel recording audio signal is supplied. 63 is an adder for returning the stereo audio signal input from 61 and 62 to a -H monaural audio signal.

Now, when the recording audio signal is interrupted, a so-called silent state occurs, and the output signal level of the adder 63 decreases. The detection circuit 64 performs envelope detection of the output signal of the adder 63, etc.
When this detection level falls below a certain threshold level, the output of the inverter 65 (shown in FIG. 6(b)) changes to a high level.

When the output of the inverter 65 is at a high level, there is a silent period. The monomulti (MM) 6B is triggered by the rising edge of the output of the inverter 65, and turns to low level after a predetermined period (TI). At this time, the output of the inverter 68 changes to high level, so the output of the AND gate 69 (shown in FIG. 6(d)) and the output of the OR gate 70 (shown in FIG. 6(e))
He also moved to a high level. On the other hand, the mono multi 67 is triggered by the rising edge of the output of the mono multi 66, and is held for a predetermined period (T2).
Later it changes to low level. The OR gate 70 receives the output of the AND gate 69 and the output of the MM67, and the output of the inverter 65 is turned to low level, and the output of the MM67 is input to the OR gate 70.
It turns to low level when the output of M67 turns to low level.

FIG. 6 shows a case where the period of silence is longer than T1+T2, and in this case, the period (T3) during which the output of the OR gate 70 is at a high level is the period of silence T
B, then T3=TB-T1. However, when T1 x TB x T2 - T1, T3=T2 as is clear from FIG.

On the other hand, when TB<T, T3=O.

The output of the OR gate 70 is supplied to the pilot signal generation circuit 32 via the terminal 71, and a pilot signal for cue detection, which will be described later, is multiplexed onto the digitally modulated audio signal via the PCM audio signal processing circuit 30 only during the period T3. Ru.

Considering this, first of all, when searching for the beginning, it is necessary to mainly detect the interval between songs, but in order to prevent a short period of silence from being judged as an interval between songs, a period called T1 is set. A silent period shorter than the period is not determined to be between songs. T.

It is considered preferable to set the time to approximately 2 seconds, for example. Of course, this T can be determined as appropriate depending on the application.

Next, T2 is determined according to the ratio of tape running speeds during recording and during cue search. That is,
It is sufficient to set a period long enough for the cue pilot signal to be detected when the tape is running at high speed. For example, specifically when running the tape at 30x speed, 307
All you have to do is set it to a period of 60 seconds or more. If it is desired to perform detection multiple times (X times), it will take x/2 seconds or more. However, if this T2 is not long, the cue pilot signal will be recorded in areas other than the recording section in the actual silent state, which is not preferable.

FIG. 7 is a diagram showing the recording state of the pilot signal in the cue section, where 1ri in the figure corresponds to T1 in FIG. 6, and T3 corresponds to T3 in FIG. 6. It shows. f1 to f4 are tracking pilot signals (TPS), T5 is a recorded detection pilot signal (MTS) that is recorded in all areas where PCM audio signals are recorded, and T6 is a cueing pilot signal (BDS).
) frequencies are shown respectively.

FIG. 8 is a circuit diagram showing a specific example of the pilot signal generation circuit 32 shown in FIG. 4.

In FIG. 8, the reference frequency multiplied signal oscillated by an oscillator 120 is supplied to frequency dividers 121 to 126 having different frequency division ratios. The frequency division ratio is l/N1.

1/N2. 1/N3. 1/Na frequency divider 121°1
22.123 and 124 are TPSf1 respectively.

It outputs f2+f3+f4, and the frequency division ratio is 17N.

17N6 frequency dividers 125 and 126 are respectively MTSf5. and outputs BDS f&.

135 is a terminal to which PG is input, and by using the PG frequency-divided by a 1/2 frequency divider 136, logic gates 137, 138, 139, and 140 successively output an H output for each field. As a result, analog switch 13
1, 132, 133 and 134 are turned on one after another for each field, and TPS is supplied to the adder 128 in the rotation of fl+f2→f3→f4.

On the other hand, 141 is a terminal to which the output of the above-mentioned cue control circuit 51 is supplied, and when the H level is supplied to the terminal 141, the switch 127 outputs fS and +6.

At other times, only fS is supplied to adder 128.

The adder 128 adds each pilot signal to terminal 1.
It is supplied to the adder 33 via 29. On the other hand, TPS is also supplied to adder 34 and ATF circuit 37 via terminal 142.

Consider each pilot signal. Regarding the TPS, it has a well-known frequency. For example, if the oscillation frequency of the oscillator 120 is 378f, Nt = 58, N
2 = 50, N3 = 36, N4 = 40,
fl: 6.5fH1f2: 7.5f, fS:
+0.5fH, f o *9.5fH.

However, unlike conventional video tape recorders,
In order to obtain a tracking error signal by sample and hold, the recording level is raised by about 3 dB from the TPS recording level when recording a video signal. This is also related to the fact that interference with chroma signals in the case of video tape recorders does not have to be taken into account. For example, when the recording level of TPS when multiplexing a video signal is set to about -14 dB with respect to the chroma signal recording level, it is set to about -11 dB when used as an audio-only device.

Next, add fS, +6 frequency, and recording level. The basic idea is that the detection is not affected by the azimuth angle, does not have a negative effect on the TPS, and
This means a frequency and a recording level that do not increase the error rate of the CM audio signal.

50 for the influence of azimuth angle and increase in error rate.
It was confirmed that there was no problem if the frequency was about 0 KHz or less. Furthermore, if the recording level was set to the same level as TPS, there would be no adverse effect on the PCM audio signal. Specifically fs.

For the +6 frequency, 378f1. (For example, f s ” 14.5fH, f 6 = 1.
8.5 fH, and also N5=26. Set N6=23. As is well known, tracking control by TPS is performed by comparing the daily components < fH, 3f, so fS is a frequency further 4fH higher than fS, and +6 is a frequency further 2fH higher than fS.
f, high frequency. Here the actual fS 218K
Hz, +6: 259KHz, which is a value with a considerable margin compared to 500KHz.

Next, the operations of cueing and blank search will be explained. FIG. 9 is a diagram showing a specific example of the circuit configuration of the cue detection circuit 52 in FIG. 4. Further, FIG. 10 is a timing chart showing the waveform of the numbered part in FIG. 9, and the following description will be made using these drawings. The reproduced signal from the gate 28 input via the terminal 71 is supplied to the BPFs 151 and 152, and the fS, +6 components are separated by the respective filters.

The output of BPF151, 152 is the detection circuit 153.154
After the level is detected by the sample and hold circuit (S/f)
) 155, 156. It is assumed that fS, +6 is a sufficiently low frequency that it is not affected by azimuth recording.

Mono multi 157 has head 3. It is triggered by the rising edge of the logical sum of the gate pulses for the head 4, and the falling edge coincides with the timing of tracing the center of each dimension area, and the S/Hs 155 and 156 operate at this timing. S/H155,
The outputs of 156 are compared with reference levels Vref' and Vref' in comparator circuits 158 and 159, respectively, and the outputs of comparator circuit 1
From 58°159, an H output signal is obtained when fS, +6 exists. Reference numeral 160 denotes a monomulti for generating pulses immediately after the sampling operation.

The output (b) of the comparator circuit 159 is inverted by an inverter 169, and the monomulti 170, which is triggered by the rise of the output (C) of the inverter 169, can obtain a high-level output (d) for a predetermined period of time. During this period, if the output (f) of the comparator 158 is H, the output (g) of the AND gate is H
period H. Moreover, if the output (f) of the comparator 158 is L during this period, the output (g) of the AND gate remains L.

Generally speaking, when a user records a song, there will be silence at the beginning and end of the song. In this case, if the preceding and following parts are unrecorded, it will be determined that there are two songs, which is not preferable for skipping to the beginning of several songs, which will be described later. Therefore, on the assumption that the beginning of the song is always detected, the detection of f6, which corresponds to the silent part at the end of the song, is disabled.

The counter 84 is used to find the beginning of a so-called skip over several songs, and counts the Q output of the counter 79 every time a recording start portion is detected. On the other hand, the operation unit 24 supplies information (DA) to the counter 84 indicating which recording start portion is to be detected from the current position, and when the count data of the counter 84 matches this data D.

A tape stop command pulse is obtained from the comparator circuit 85, and the fact that this is the desired beginning of the track is notified to the capstan controller 53, which will be described later, via the monomulti 86 and terminal 87.

Now, when the head 3.4 enters the part where no PCM audio signal is recorded for the specified information area, the comparator circuit 1
The output of 58,159 is L, and as a result, Noah game) 1
The output of 61 becomes H. After the output of the non-game) 161 changes to H, the anti-game) 163 supplies a pulse output from the monomulti 160 to the counter 165. When the counter 165 counts a predetermined number of consecutive pulses, it supplies an H Q output to the capstan controller 531 via the terminal 168, and similarly stops the tape running.

Inverter 162. The AND gate 164 is provided to reset the counter 165 when f5 or f6 is reproduced so that the counter 165 outputs H only when continuous detection is performed, that is, to prevent detection errors. Furthermore, the monomulti 167 and the game (or game) 166 are provided to keep the counter 165 inactive for a while once detection is performed.

Next, the operation of the capstan controller 53 in FIG. 4 will be explained. FIG. 11 is a flowchart for explaining an example of the operation of the capstan controller 53, FIG. 12 is a diagram for explaining media travel control, and FIG. 12 is a flowchart for explaining another example of the operation.

First, the operation based on the flowchart in FIG. 11 will be explained. When a cue command is issued from the operation unit 24 (step indicated by Sl in FIG. 11), this command is fast forwarded (F
F) If it is at the beginning, fast forward the tape l at n times the recording speed (S5) and rewind it.FR) If it is at the beginning, rewind the tape at n times the recording speed (S3). At this time, of course, the area is designated by the system controller 25, and the gate circuit 28 is operated by the gate pulse from the gate pulse generation circuit 23.

When rewinding and cueing, the monomulti 86 in Figure 9
When an H output is obtained (S4), it means that the portion corresponding to the DA-th T3 period mentioned above has been detected, and the capstan control circuit stops the tape (S9) and starts playback. 20 and system controller 25
control.

FIG. 12(d) is a diagram showing this situation. Between songs (MU
between SICI and MUSIC2).
), f6 is recorded as mentioned above, but the output from the mono multi 86 is actually obtained at the timing when f5 is detected after f6 is no longer detected. ), the timing shown in ■C3 is reached.

When a command to stop the tape is given at timing C3, the stop is actually completed due to the influence of inertia after the tape 1 has run to the stop position where the head 3.4 traces the part shown in ST2. It turns out that.

On the other hand, when performing fast forward cue, H from Mono Multi 86
When the output of 1 is obtained (S6), the tape 1 is temporarily stopped and rewinding is started in the opposite direction (S7). Then, when the output of the comparator 159 in FIG. 9 becomes H (S8), the tape is stopped and further reproduction is started.

This situation is shown in FIG. 12(c). Monomulti 86 is C
It becomes H at the timing of 1, and this 0 due to the influence of inertia.
After passing 1, rewind is performed at n times speed. Then, this time C
At timing 2, the output of the comparison circuit 159 becomes H, a command is given to stop the tape, and the tape actually takes the stop position shown in ST1.

Here, it is preferable that the influence of inertia be about half of the period of T1. That is, if n is too large, if playback is started from the stop position, there is a possibility that the last end of the song MUSICI will be played back. For example, now T1 is 2 seconds or 1
If T2 is 1 second for 20) racks, that is, 60 tracks, the value of n should be determined so that the influence of inertia is about 60) racks. In this way, the tape will always stop at a position where it can be played from the silent section,
Good reproduction can be performed.

Next, another example of operation shown in FIG. 13 will be explained. In this case, it is also possible to further increase the tape running speed at the beginning of fast forwarding or rewinding.

When searching for the beginning of fast forwarding (S15), when the output from the monomulti 86 is detected (S16) as in the example of FIG.
, stops the tape. At this time, as shown in FIG. 12 (E), this stop position is quite far into the music of MUSIC2. Next, the tape l is made to run in the rewinding direction at a speed m times the recording speed.

m is set considerably smaller than n. For example n=60
Set m = 5 for . If f6 can be detected X times in the portion corresponding to the period T3 when the tape is run at n times the speed, then f6 can be detected n X / m times when the tape is run at m times the speed.

Therefore, the rising and falling portions of the period T3 can be detected quite accurately.

When it is detected that the comparator circuit 159 becomes H at the timing shown in FIG. to stop. The number of FG counts is, for example, 120 tracks, and if one FG is generated while one track tape l runs, then the number of FGs is 120.
If it stops when Xk counts have been counted, a good stopping position is obtained (as shown in ST3 in FIG. 12).This is based on the premise that there are T1 for 120 tracks and T3 for about 60+ tracks.

On the other hand, in the case of rewinding and cueing the beginning, the output of the mono multi 86 is H.
If so (S12), the tape running direction is reversed and the tape is run in the opposite direction at n times the speed (S13). Then, when the output of the comparator circuit 159 becomes H, the tape is stopped, and the tape is run in the opposite direction at m times the speed (S17). The subsequent steps are the same as in the case of fast forward cueing.

If the tape is stopped according to the flowchart of FIG. 13, the search speed is temporarily reduced, so the detection accuracy of silent parts is greatly improved, and the tape can be stopped reliably at a fixed position.

According to the above-described tape recorder, a period of silence can be automatically detected and detected reliably, so that a high-quality, long-time recording tape recorder that is extremely user-friendly can be obtained.

In addition, in this specification, digital modulation recording (PCM)
Although the present invention is only described, similar effects can be obtained even if the present invention is applied to an audio signal recording apparatus that performs analog FM modulation recording.

Moreover, although only the case where T6 is recorded as a cue pilot signal has been described, it is also possible to adopt a configuration in which cue data is added to audio signal data. In this case, it is desirable to record this data close to the digital synchronization data in view of the difficulty of detection during a search.

<Description of Effects> As explained above, according to the present invention, it has become possible to easily search and identify recorded audio signals without bothering the user.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the tape running system of a conventional tape recorder, Fig. 2 is a diagram showing the recording format of the recorder shown in Fig. 1, and Fig. 3 is a diagram showing the recording and playback timing of the recorder shown in Fig. 1. 4 is a diagram showing a schematic configuration of a tape recorder as an embodiment of the present invention, FIG. 5 is a diagram showing a specific example of the cue control circuit in FIG. 4, and FIG. FIG. 8 for explaining the operation of the circuit in FIG. 5 is a diagram showing a specific example of the pilot signal generation circuit in FIG. 4, and FIG. 9 is a diagram showing a specific example of the cue detection circuit in FIG. 4. A flowchart showing a specific example of the operation of the roller, FIG.
13 is a flowchart showing another specific example of the operation of the capstan controller in FIG. 4. FIG. 3.4 is the head, 29 is the audio signal input terminal, 25
30 is a system controller, 30 is a PCM audio signal processing circuit, 32 is a pilot signal generation circuit, 33 is an addition circuit, 51 is a cue control circuit, 52 is a cue detection circuit,
53 is a capstan controller.

Claims (1)

[Claims] means for detecting silence in an input audio signal;
means for generating silence information at a timing based on the output of the detection means; means for recording the silence information on a recording medium together with the audio signal; transport means for driving the recording medium; An audio signal recording and reproducing apparatus comprising means for reproducing the silent part information from the recording means, and control means for controlling the transporting means based on the silent part information reproduced by the reproducing means.