JPH0770103B2 - Rotating head type recording / reproducing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rotary head type recording / reproducing apparatus, and more particularly to a rotary head type recording / reproducing apparatus having a recording signal cueing function.

<Description of Prior Art> Conventionally, various identification functions have been added to an audio signal recording / reproducing apparatus. Particularly, in a recording apparatus capable of recording for a long time and recording an audio signal with high sound quality, a cue function is required.

Conventionally, the cueing method for an audio tape recorder is to run the tape at a speed that is several to several tens of times as fast as when recording, and to detect the silent part of the audio signal that is reproduced. Was there.

On the other hand, in recent years, various techniques for recording an audio signal by using a rotating head have been proposed along with the improvement in audio quality of the audio signal. For example, as modulation for audio in a video tape recorder, FM modulation recording by a rotating head, and as a dedicated audio device, digital modulation recording by a rotating head is known.

Further, in response to this, an audio recorder for devising the audio signal by time axis compression and digital modulation recording has been devised.

Hereinafter, an example of an audio tape recorder for digitally modulating and recording an audio signal on the time axis by using a rotating head will be briefly described.

FIG. 1 is a diagram showing an example of a tape running system of a conventional audio tape recorder of this type. In FIG. 1, reference numeral 1 is a magnetic tape, and 2 is a rotating cylinder that holds rotating heads 3 and 4. As a result, the heads 3 and 4 trace the tape 1 obliquely to record an audio signal. Whenever the heads 3 and 4 rotate by 36 °, time-compressed audio signals are recorded in the six areas formed in the longitudinal direction of the tape 1, respectively, so that audio signals of a total of 6 channels can be recorded. That is, a dedicated tape recorder can be obtained.

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

In FIG. 2, CH1 to CH6 respectively trace head 3 or head 4 in FIG. 1 from A to B, B to C, C to D, D to E, E to F, F to G. It is an area where the audio signal is recorded during the period. It is possible to separately record audio signals in each area, and so-called azimuth overwriting is performed in each area, but the tracks in each area CH1 to CH6 do not have to be on the same straight line. The pilot signal for tracking control is recorded in each area, but it is assumed that it is recorded in a predetermined rotation (f ₁ → f ₂ → f ₃ → f ₄ ) for each area. There is no correlation between them.

Areas indicated by CH1 to CH3 are recorded and reproduced when the tape 1 is running at a predetermined speed in a direction indicated by an arrow 7 in FIG. 1, and areas indicated by CH4 to CH6 are also indicated in an arrow 9 direction. Recorded and played back while driving. Therefore, as shown in FIG. 2, the inclination of each track in the area shown in CH1 to CH3 and CH4 to C
The slope of each track in the area indicated by H6 is slightly different. However, the difference in relative speed at this time is not a problem because the tape 1 travels much less than the heads 3 and 4 rotate.

FIG. 3 is a time chart of recording / reproduction of the tape recorder as described above. In the figure, (a) is a phase detection pulse (hereinafter, PG) generated in synchronization with the rotation of the cylinder 2, which has a frequency of 30 Hz which repeats "high level (H)" and "low level (L)" in 1/60 seconds. It is a square wave. Further, (b) is a PG having a polarity opposite to that of PG (a). Here, in PG (a), the head 3 is B in FIG.
It is assumed that H during rotation from G to G and PG (b) is H during rotation of the head 4 from B to G as well.

FIG. 3 (c) is a pulse for reading data obtained from PG (a), which is for sampling the audio signal for every one field of the video signal (1/60 seconds) every other field. is there. FIG. 3 (d) shows a signal processing period H for adding error correction redundancy code or the like to the sampled audio data for one field by using RAM or the like. FIG. 3 (e) shows the period of data recording as H, and shows the timing of recording the recording data obtained by the above-described signal processing on the tape 1.

For example, when the signal flow is temporally traced using FIG. 3, t1
The data sampled during the period from t3 to t3 (while the head 3 is moving from B to G) is subjected to signal processing at t3 to t5 (head 3 is G to A), and t5 to t6 (head 3 is A to B). Will be recorded during the period. That is, the data is recorded in the CH1 area of FIG. 2 by the head 3. On the other hand, the data sampled while PG (b) is H is processed at the same timing,
Is recorded in the CH1 area by.

FIG. 3 (f) shows a PG in which PG (a) is phase-shifted by a predetermined phase (here, 36 ° for one area).

Hereinafter, a case where an audio signal is recorded by PG (f) and a PG (not shown) having an opposite characteristic will be described. Fig. 3
The data sampled from t2 to t4 is the third data from t4 to t6.
The signal is processed according to the signal shown in FIG. 3G, and is recorded according to the signal shown in FIG. 3H during the period from t6 to t7.

That is, the head 3 records in the area indicated by CH2 in FIG. 2 while the head 3 traces B to C. The data sampled in the period of t4 to t7 in synchronization is the head 4
Is recorded in the area indicated by CH2.

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

Data reading from the tape 1 by the head 3 is performed at t6 to t7 (t1 to t2 are the same) in accordance with the signal shown in FIG. 3 (h), and t7 to t8 (t2 in accordance with the signal shown in FIG. 3 (i). The signal processing opposite to that at the time of recording is performed from ~ t3). That is, error correction is performed during this period, and then t8 is applied in accordance with the signal shown in FIG.
The playback audio signal is output at ~ t9 (t3 ~ t6). Of course, the reproducing operation by the head 4 is performed with a phase difference of 180 ° from the above operation, and a continuous reproducing audio signal can be obtained by this.

Also for other regions CH3 to CH6, PG (a) is set to n × 36 °.
It goes without saying that the recording / reproducing operation may be performed based on the phase division, and this does not depend on the running direction of the tape.

In this way, it became possible to use the VTR as a dedicated audio device that can record for a long time with multiple channels.

However, this kind of audio tape recorder can quickly find out what part of the tape is recorded, even though 90 minutes of recording for each area can be recorded for a long time of 9 hours. Is difficult to do.

That is, when a tape as a recording medium is run at high speed,
The head cannot trace accurately on the recording track. Therefore, the playback audio signal cannot be obtained from the PCM audio signal, and the silent part cannot be detected. In addition, regarding the silent part, the PCM corresponding to the information of the silent part.
Since the audio signal is recorded, it is impossible to detect the presence or absence of the recording signal.

<Objects of the Invention> The present invention has been made in view of the above problems, and provides a rotary head type recording / reproducing apparatus capable of easily discriminating a recording signal from an information signal recorded by any recording format. The purpose is to provide.

<Explanation by Examples> Hereinafter, the present invention will be described by using Examples.

FIG. 4 is a diagram showing a schematic configuration of a tape recorder as one embodiment of the present invention. In FIG. 4, the same components as those in FIGS. 1 and 2 are designated by the same reference numerals.

PG obtained from the rotation detector 11 of the rotary cylinder 2 is supplied to the cylinder motor control circuit 16 to rotate the cylinder 2 at a predetermined rotation speed and a predetermined rotation phase. Reference numerals 12 and 13 are rotation detectors of flywheels 17 and 18 of capstans 14 and 15, respectively, and outputs (FG) of these 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 through a switch 21 so that the capstan 14 or 15 can rotate at a predetermined speed during recording. The switches 19 and 21 are connected to the F side in the drawing when the tape is run in the direction (forward direction) shown in the arrow 7, and to the R side in the drawing when running the tape in the direction (reverse direction) shown in the arrow 9.

By operating the operation unit 24 manually, operation modes such as recording and reproduction, and an area to be recorded and reproduced are designated. Further, it is also specified whether the recording is performed exclusively for audio or whether the video signal is also recorded by the recording pattern of FIG.

These data are supplied to the system controller 25,
The system controller 25 is a capstan motor control circuit.
20, switches 19 and 21, area designation circuit 26, gate circuit 27
Further, it controls the capstan controller 53 and the like. Then, the area designating circuit 26 supplies the area designating data to the gate pulse generating circuit 23 to obtain a desired gate pulse.
The area designated when recording a video signal is naturally CH1.

As the control gate pulse of the gate circuit 28, based on the area designation data, for each of the head 3 and the head 4,
The aforementioned window pulse is selectively supplied.

At the time of recording, the analog audio signal input from the terminal 29 is supplied to the PCM audio signal processing circuit 30 and is sampled at the above-mentioned timing related to the window pulse,
After being converted into digital data, the above-mentioned signal processing is performed. The recording audio data thus obtained is generated by the pilot signal generating circuit 32 at every rotation of f ₁ → f ₂ → f ₃ → f ₄ for tracking tracking pilot signals and other pilot signals described later and adder. It is added at 33. The output of the adder 33 is appropriately gated by the gate circuit 28 as described above, and written in a desired area by the heads 3 and 4.

At the time of reproduction, the reproduction signals of the heads 3 and 4 are also extracted by the gate circuit 28 by the window pulse, and the reproduction signals are transmitted through the A side terminal of the switch 34 to the low pulse filter (LPF) 3
5 and the PCM audio circuit 30. In the PCM audio circuit 30, signal processing such as error correction, time axis expansion, digital-analog conversion and the like is performed contrary to recording, and a reproduced analog audio signal is output from the terminal 36.

The LPF 35 separates the tracking pilot signal and supplies it to the ATF circuit 37. The ATF circuit 37 is a circuit for obtaining a tracking error signal based on the well-known 4-frequency system.
It is well known that the reproduced tracking pilot signal and the pilot signal generated by the pilot signal generating circuit 32 at the same rotation as at the time of recording are used. However, when it is used as an audio dedicated device, a tracking error signal is obtained for each area, so this is sampled and held. The tracking error signal thus obtained is supplied to the capstan motor control circuit 20, and the running of the tape 1 during reproduction is controlled via the capstans 14 and 15 to perform tracking control.

Next, recording / reproduction of a video signal will be described.

When a command to record / reproduce a video signal is issued from the system controller 25, the area designating circuit 26 forcibly designates the CH1 area and also operates the gate circuit 27 in accordance with PG. The video signal input from the terminal 38 is converted into a signal form suitable for recording by the video signal processing circuit 39 and is added to the post-adder.
Supplied to 40. Then, it is added to the pilot signal obtained from the pilot signal generating circuit 32 by the adder 40 and is recorded in the areas CH2 to CH6 by the heads 3 and 4 via the gate circuit 27. The recording operation of the PCM audio signal at this time is exactly the same as the above-mentioned recording operation for CH1.

During reproduction, the video signal picked up from the heads 3 and 4 is made a continuous signal through the gate circuit 27. This continuous signal is supplied to the video signal processing circuit 39, converted into the original signal form, and output from the terminal 41. 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 the pilot signal component and supplies it to the ATF circuit 37. At this time, it is not necessary to sample and hold the tracking error signal obtained from the ATF circuit 37, and it is directly supplied to the capstan motor control circuit 20. At this time, the PCM audio signal is also reproduced from the CH1 area and the 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 described. FIG. 5 is a diagram showing a specific configuration example of the cue control circuit 51 shown in FIG. 4, and FIG. 6 is a timing chart showing the waveforms of the respective portions of FIG.

In FIG. 5, reference numeral 61 is a terminal to which the L channel recording audio signal is supplied, and 62 is a terminal to which the R channel recording audio signal is supplied. 63 is an adder, 61,6
This is for temporarily returning the stereo audio signal input from 2 to a monaural audio signal.

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

When the output of the inverter 65 is at high level, there is a silent period. The mono-multi (MM) 66 triggers at the rising edge of the output of the inverter 65 and turns to a low level after a predetermined period (T1).
At this time, since the output of the inverter 68 shifts to the high level, 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)) also shift to the high level. On the other hand, the mono-multi 67 is triggered by the falling edge of the output of the mono-multi 66 and shifts to the low level after a predetermined period (T2). The OR gate 70 receives the output of the AND gate 69 and the output of the MM67, and turns to the low level when the output of the inverter 65 is turned to the low level and the output of the MM67 is turned to the low level.

FIG. 6 shows a case where the silent period is longer than T1 + T2. In this case, if the silent period is T _B during the period when the output of the OR gate 70 is at high level (T3), T ₃ = T _B −T ₁ . However, when T ₁ <T _B <T ₂ −T ₁ , T ₃ = T _{2 as} apparent from FIG. On the other hand, when T _B <T ₁ , T ₃ = 0.

The output of the OR gate 70 is supplied to the pilot signal generating circuit 32 via the terminal 71, the cue detection pilot signals which will be described later only during the period T _3, PCM audio signal processing circuit 3
It is multiplexed with the digitally modulated audio signal via 0.

To consider this, first of all, when cueing, it is necessary to mainly detect the interval between songs, but a period of T ₁ is set so as not to distinguish a short period of silence from the interval between songs,
The silent period shorter than this period is not judged to be between songs. It seems preferable to set T ₁ to about 2 seconds, for example. Of course, this T ₁ can be appropriately determined according to the application.

Next, T ₂ is determined according to the ratio of the running speed of the tape during recording and during cue search. That is, it suffices to set a period sufficient to detect the cueing pilot signal when the tape is run at a high speed. For example, if you want to run the tape at 30 times speed, set the period to 30/60 seconds or more. Multiple detections (x times)
If you want to do it, it means x / 2 seconds or more. However, if this T ₂ is too long, the cueing pilot signal will be recorded in a portion other than the actual silent recording portion, which is not preferable.

FIG. 7 is a diagram showing a recording state of the pilot signal of such a cueing portion, in which T ₁ is a portion corresponding to T ₁ in FIG.
T ₃ indicates a portion corresponding to T ₃ in FIG. f ₁
~ F ₄ are tracking pilot signals (TPS), f _{5 respectively}
Indicates the frequency of the recorded detection pilot signal (MTS), which is all recorded in the portion where the PCM audio signal is recorded, and f ₆ indicates the frequency of the cueing pilot signal (BDS).

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

In FIG. 8, the reference frequency signal oscillated by the oscillator 120 is supplied to the frequency dividers 121 to 126 having different frequency division ratios.
Dividers with division ratios of 1 / N ₁ , 1 / N ₂ , 1 / N ₃ and 1 / N ₄ 121,122,123,124
Outputs TPSf ₁ , f ₂ , f ₃ , and f ₄ , respectively, and the division ratios are 1 / N ₅ and 1 / N _{6 respectively.}
The frequency dividers 125 and 126 output MTSf ₅ and BDSf ₆ , respectively.

135 is a terminal to which the PG is input, and by using the PG divided by the 1/2 divider 136, the logic gates 137, 138, 139,
140 outputs H output one after another every one field. As a result, the analog switches 131, 132, 133, and 134 are turned on one after another for each field, and the adder 128 is supplied with TPS at a rotation of f ₁ → f ₂ → f ₃ → f ₄ .

On the other hand, 141 is a terminal to which the output of the aforementioned cueing control circuit 51 is supplied, and the switch 127 adds f ₅ and f ₆ when H is supplied to the terminal 141, and only f ₅ at the other times, to the adder 128.
Supply to. In the adder 128, each pilot signal is added and supplied to the adder 33 via the terminal 129. On the other hand, TPS is also supplied to the adder 34 and the ATF circuit 37 via the terminal 142.

Consider each pilot signal. It has a known frequency for TPS. For example, if the oscillation frequency of the oscillator 120 is 378f, N ₁ = 58, N ₂ = 50, N ₃ = 36, N ₄ = 40, and f ₁ ≈6.5f _H , f ₂ ≈7.5f _H , f ₃ ≈ 10.5f _H, and f ₄ ≒ 9.5f _H.

However, at this time, unlike the conventional video tape recorder,
The recording level is increased by about 3 dB from the recording level of TPS when recording a video signal to obtain a tracking error signal by sample hold. This is also related to the fact that in the case of a video tape recorder it is not necessary to consider the interference with the chroma signal. For example, when the recording level of TPS when multiplex recording on a video signal is about -14 dB with respect to the recording level of a chroma signal, when it is used as a dedicated audio system, it is set at about -11 dB.

Then the frequency of f _5, f _6, adding the recording level. The basic idea is to have a frequency and recording level that are not affected by the azimuth angle during detection, have no adverse effect on TPS, and do not increase the error rate of the PCM audio signal.

500K for effect of azimuth angle and increase of error rate
It was confirmed that there was no problem if it was about Hz or less. Moreover, if the recording level was the same as that of TPS, it did not adversely affect the PCM audio signal. Specifically
Regarding the frequencies of f ₅ and f ₆ , it is desirable to divide the same oscillator of 378f _H by a division ratio of an integral multiple, for example, f ₅ = 14.5f _H , f ₆ = 16.5f _H Also N ₅ =
Set 26, N ₆ = 23. For the control of the tracking by the TPS performed by comparing the known as f _H, 3f _H component, f ₅ further 4f _H higher frequency than f _3, f ₆ is a further 2f _H higher frequencies. Here, f ₅ ≈ 218 KHz and f ₆ ≈ 259 KHz are actually obtained, and it can be seen that the values have a considerable margin compared to 500 KHz.

Next, the operation of cueing and blank search will be described. FIG. 9 is a diagram showing a specific circuit configuration example of the cue detection circuit 52 in FIG. Further, FIG. 10 is a timing chart showing the waveform of each part in FIG. 9, which will be described below with reference to these drawings. Gate input via terminal 71
The reproduction signal from 28 is supplied to the BPFs 151 and 152, and the f ₅ and f ₆ components are separated by the respective filters. The outputs of the BPFs 151, 152 are level-detected by the detection circuits 153, 154 and then supplied to the sample hold circuits (S / H) 155, 156. Incidentally, f _5, f ₆ is assumed to be a degree sufficiently low frequency that is not affected by the azimuth recording.

Monomulti 157 is triggered by the rising edge of the logical sum of gate pulses for head 3 and head 4, and the falling edge coincides with the timing of tracing the center of each area. At this timing,
S / H155, 156 operates. S / output H155,156 are compared with each comparator circuit 158, 159 a reference level Vref ', Vref "and, .160 output signal of H is obtained when there is f _5, f ₆ from the comparison circuit 158, 159 is sampled It is a mono-multi for generating a pulse immediately after operation.

The output (b) of the comparison circuit 159 is inverted by the inverter 169,
The monomulti 170, which is triggered by the rise of the output (c) of the inverter 169, is adapted to obtain a high level output (d) for a predetermined time. If the output (f) of the comparator 158 is H during this period, the output (g) of the AND gate becomes the H period H of the output of the monomulti 170. If the output (f) of the comparator 158 is L during this period, the output (g) of the AND gate remains L.

This generally means that when a user records a certain piece of music, there is a silent portion at the beginning and end of the piece. In this case, the silent parts at the beginning and the end of the music are judged to be between the respective songs, and if the recording part of the music having a silent part at the beginning and the end is unrecorded, the beginning and the end. Even if only one song is originally recorded, it is erroneously determined that the information for two songs is recorded even though the silent portions are judged to be between the songs.

Therefore, by using both the recorded detection signal and the cueing detection signal, it is detected whether or not the recording portion is immediately after the end of the silent portion (at the high timing shown in FIG. ) (By detecting the state of (f ')), it is detected whether or not the recording portion follows the silent portion, and based on this, the tape feeding for cueing is controlled.

In the present embodiment, when the unrecorded portion is detected after the silent portion (the case of FIG. 10 (g)), this detection result is invalidated.

The counter 84 is for realizing so-called jumping of several songs, and the count value of the counter 84 is incremented each time the recording start portion is detected. On the other hand, from the operation unit 24, the information (D _A ) indicating whether to detect the number of recording start portion from the current position is supplied to the comparison circuit 85, and this data D _A and the count data of the counter 84 match. At this time, a tape stop command pulse is obtained from the comparison circuit 85, and the capstan controller 53, which will be described later, is notified via the monomulti 86 and the terminal 87 that this is the desired beginning of the music.

Now, when the heads 3 and 4 plunge into the portion where the PCM audio signal is not recorded in the designated area, the comparison circuits 158 and 159
Is L, so that the output of NOR gate 161 is H.
Becomes After the output of the NOR gate 161 turns to H, the AND gate 163 supplies the pulse output from the monomulti 160 to the counter 165. When the counter 165 continuously counts this pulse for a predetermined number, it supplies the Q output of H to the capstan controller 531 via the terminal 168 and similarly stops the tape running.

The inverter 162 and the AND gate 164 are provided so that the counter 165 outputs H only after continuous detection, that is, in order to prevent a detection error, the counter 165 is reset when f ₅ or f ₆ is reproduced. There is. The monomulti 167 and the OR gate 166 are provided to keep the counter 165 inactive for a while once the detection is performed.

Next, the operation of the capstan controller 53 in FIG. 4 will be described. Figure 11 shows the capstan controller.
Flow chart for explaining an example of the operation of 53, No. 12
The capstan controller 53 is a diagram for explaining the traveling control of the medium, and FIG. 13 is a flow chart for explaining another example of the operation of the capstan controller 53.

First, the operation based on the flow chart of FIG. 11 will be described. When a cueing command is issued from the operation unit 24 (step S1 in FIG. 11), if this command is a fast forward (FF) cueing, the tape 1 is fast-forwarded at a speed n times faster than when recording. (S5) and rewinding (FR) When the tape is at the beginning, the capstan control circuit 20 is controlled so that the tape is rewound at a speed n times as fast as the recording (S3). At this time, of course, the area is specified by the system controller 25, and the gate circuit 28 is operated by the gate pulse from the gate pulse generating circuit 23.

When the H output is obtained from the mono-multi 86 in Fig. 9 (S4) during the rewinding cue, it means that the portion corresponding to the period of the D _A th T ₃ is detected. The capstan control circuit 20 and the system controller 25 are controlled so that the tape is stopped (S9) and the reproduction is further started.

FIG. 12 (d) is a diagram showing this state. Between songs (MUSIC
Although f ₆ is recorded as described above corresponding to the silent part (BLANK) of (between 1 and MUSIC2), the output is actually obtained from the monomulti 86 after f ₆ is no longer detected. _{Since 5} is the timing of detection, in Fig. 12 (d)
The timing is shown in C3. If a tape stop command is issued at the timing of C3, it will actually stop due to inertia. ● Tape 1 has run to the stop position where heads 3 and 4 trace the part shown in ST ₂ . It will be later.

On the other hand, when the output of H is obtained from the mono-multi 86 during fast forward cueing (S6), stop the tape 1 once,
In the future, the reverse direction, that is, rewinding is started (S7). Then, when the output of the comparator 159 in FIG. 9 becomes H (S
8) Stop the tape and start playing again.

This is shown in Figure 12 (c). The mono-multi 86 becomes H at the timing of C1, and after this C1 is exceeded due to the influence of inertia, it is rewound at n times speed. Then, this time, the output of the comparison circuit 159 becomes H at the timing of C2, the tape stop is instructed, and the stop position shown in ST ₁ is actually taken.

Here, the influence of inertia is preferably about half of the period of T ₁ . That is, if n is too large, there is a possibility that the rear end of the music MUSIC1 will be reproduced if the reproduction is started from the stop position. For example, if T ₁ is 2 seconds, that is, 120 tracks, and T ₂ is 1 second, that is, 60 tracks, it is sufficient to determine the value of n so that the influence of inertia is about 60 tracks. In this way, the tape is always stopped at the position where it can be reproduced from the silent portion, and good reproduction can be performed.

Next, another operation example shown in FIG. 13 will be described. In this case, it is possible to further increase the tape running speed during fast forward cueing and rewinding cueing.

At the time of fast forward cueing (S15), when the output from the monomulti 86 is detected (S16), the tape is stopped as in the example of FIG. At this time, as shown in Fig. 12 (e), this stop position is
It is a position that is quite included in the music of MUSIC2. Next, the tape 1 is run in the rewinding direction at a speed that is m times as high as that at the time of recording.

m is set to be considerably smaller than n. For example, m = 5 is set for n = 60. When the tape is run at n times speed, X times f ₆ in the part corresponding to the period of T ₃
If the tape can be detected, it is possible to detect f ₆ nX / m times when the tape is run at m-times speed. Therefore, the rising and falling parts of T ₃ period can be detected fairly accurately.

When it is detected that the comparison circuit 159 becomes H at the timing shown in FIG. 9C5, counting of the FG of the capstan 14 is started (S19), and when the FG reaches the predetermined number (S20), the tape 1 is loaded. Stop it. This FG count is, for example, 120 trucks, and if 1 tractor 1 travels while k FGs are generated, a good stop position can be obtained by stopping when 120 × k are counted (Fig. 12). shown in ST _3), Note which T ₁ is 120 track component, T ₃ is based on the assumption that it is about 60 tracks min.

On the other hand, in the case of rewinding cueing, when the output of the mono-multi 86 becomes H (S12), the tape running direction is reversed, and n is reversed.
Run the tape at double speed (S13). Then, this time, the tape is stopped when the output of the comparison circuit 159 becomes H, and the tape is run in the reverse direction at m times speed (S17). After that, it is the same as the case of fast forward cueing.

If the tape is stopped in accordance with the flow chart shown in FIG. 13, the search speed is once lowered, so the detection accuracy of the silent part is extremely improved, and the tape can be stopped reliably and at a fixed position.

According to the tape recorder as described above, since the silent period can be automatically detected and can be surely detected, it is possible to obtain a high-quality, long-time recording tape recorder which is extremely convenient for the user.

Although only the digital modulation recording (PCM) is described in the present specification, the same effect can be obtained by applying the present invention to an audio signal recording device which performs analog FM modulation recording.

Further, although only the recording of f ₆ as the cueing pilot signal has been described, the cueing data may be added to the audio signal data.
In this case, it is desirable to record this data close to the digital synchronization data in consideration of the difficulty of detection at the time of search.

<Explanation of Effects> As is apparent from the above description, according to the present invention, the recorded signal and the cue detection signal are used together, and the recorded part of the non-signal portion detected based on the cue detection signal is recorded. Since the inter-track detection is performed depending on the presence or absence of the detection signal, it is possible to prevent erroneous detection due to an unrecorded portion following the recording portion.

[Brief description of drawings]

FIG. 1 is a diagram showing a tape running system of a conventional tape recorder, FIG. 2 is a diagram showing a recording format of the recorder shown in FIG. 1, and FIG. 3 is a timing showing recording / reproducing timing of the recorder shown in FIG. FIG. 4 is a diagram showing a schematic configuration of a tape recorder as one embodiment of the present invention, FIG. 5 is a diagram showing a specific example of a cue control circuit in FIG. 4, and FIG. 5 is a diagram for explaining the operation of the circuit of FIG. 5, FIG. 7 is a diagram showing the recording state of the pilot signal at the cue portion, and FIG. 8 is a specific example of the pilot signal generating circuit in FIG. FIG. 9 is a diagram showing a specific example of the cue detection circuit in FIG. 4, FIG. 10 is a timing chart showing the operation of the circuit of FIG. 9, and FIG. 11 is a timing chart. FIG. 12 is a flowchart showing a specific example of the operation of the capstan controller. Diagram for explaining a tape travel control by the capstan controller in FIG. 4, FIG. 13 is a flow chart showing another specific example of the operation of the capstan controller in Figure 4. 3, 4 heads, 29 audio signal input terminals, 25 system controller, 30 PCM audio signal processing circuit, 3
2 is a pilot signal generation circuit, 33 is an adder circuit, 51 is a cue control circuit, 52 is a cue detection circuit, and 53 is a capstan controller.

(72) Inventor Masahiro Takei, 770 Shimonoge, Takatsu-ku, Kawasaki-shi, Kanagawa Canon Inc., Tamagawa Plant In-house (72) Inventor Tomohiko Sasaya, 770 Shimonoge, Takatsu-ku, Kawasaki-shi, Kanagawa Canon Inc. Tamagawa Plant (56) References JP49-40710 (JP, A) JP59-168961 (JP, A) ) Actual development Sho 61-48436 (JP, U)

Claims (1)

[Claims] 1. A tape-shaped recording medium is used to sequentially form tracks by a rotary head, and a plurality of information signals are sequentially recorded by the rotary head at predetermined intervals. Recording a cue detection signal on each predetermined track, the information signal from the recording medium by the rotary head,
A rotary head type recording / reproducing apparatus for reproducing a recorded detection signal and a cue detection signal, wherein the extracting means extracts each of the recorded detection signal and the cue detection signal from the reproduction signal of the rotary head, and the extracting means. On the basis of the recorded detection signal and the cue detection signal extracted in, a control means for controlling the conveyance of the tape-shaped recording medium, and the control means, the recorded detection signal and cue detection signal A rotary head type recording / reproducing apparatus, which is used together to detect the gap based on the presence or absence of the recorded detection signal after a no-signal portion detected based on the cue detection signal.