JPS6224476A - Recording track controller - Google Patents

Abstract

PURPOSE:To record surely a program of FM broadcast or the like on an idle track when said program, for instance, is required to record urgently, by performing the reproducing operation for 1-2sec to detect automatically an unrecorded track, and recording an audio signal there. CONSTITUTION:When a key 3 is operated, a system controller 11 performs the reproducing operation for 1-2sec, and a gate circuit 43 selects and outputs recorded data on the first-sixth tracks read out from a head HA, and only at M.T.S discrimination signal is taken out by a band pass filter 44. A Schmitt circuit 47 outputs signal '1' or '0' in accordance with the discrimination signal recording state, and a shift register 48 reads the output signal of the circuit 47 and shifts it successively. The system controller 11 judges whether an unrecorded track exists or not in accordance with latch data of a latch circuit 50, and a track selecting signal PSW is outputted from a PCM control signal generating circuit 13 to drive a track indicator 17 corresponding to the unrecorded track. The recording operation of the audio signal is started by a PCM recording circuit 24.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a recording track control device for recording audio signals on unrecorded tracks in a PCM multitrack system using a 3 mm videotape.

[Prior art and its problems] Conventionally, 1/2 inch VTRs have been widely used, but recently 8 mm VTRs have been put into practical use. This 8mm VTR has P as an option.
Recording/playback of CM audio signals is possible.

Recently, however, a PCM multi-track system has been considered that allows long-term recording of PCM audio signals using the above-mentioned 8 mm VTR tape. In this PC, M multi-track system, the PCM audio recording area of the 8mm video is set to one track, and the video signal recording area is set to 5.
According to this method, for example, 540 minutes (9 hours) of PCM audio signals can be recorded on a 90-minute 8 mm video cassette. If you use the 8mm video PCM multi-track system as described above, it is possible to record for a long time, but since recording is done on 6 tracks (1st to 6th), it is very difficult to understand the recording status of each track. It is. For this reason, for example, F
When a user wants to urgently record a M broadcast program or the like, he or she may not know which of the first to sixth tracks has already been recorded, and may end up erasing important recordings by mistake.

Furthermore, in the 8mm video PCM multi-track system, since different signals are recorded/reproduced using the same tape as the 8mm VTR, it is necessary to identify the two. To date, M, T, S (Mu
l t i-Track mode recogni
sion 3igna1) is recorded at the same time as the PCM multi signal, and the PCM multi signal is recorded depending on the presence or absence of this signal during playback.
Proposals have been made to determine whether it is multi-purpose or not. This is so that when recording PCM data on a tape, a 228.748 KHz signal is recorded by frequency multiplexing. As mentioned above, in the PCM multitrack system, it is necessary to record M, T, and S on the tape, but conventionally, M, T, and S are recorded on the tape.

It is merely used to determine whether or not the tape is for S@PCM multi use.

[Object of the Invention] The present invention has been made in view of the above points, and even in the case of emergency recording, it is possible to reliably record the recorded contents on an empty track without the risk of accidentally erasing the recorded contents. An object of the present invention is to provide a recording track control device.

[Summary of the Invention] The present invention detects an unrecorded track on a tape by using M, T, and S when a specific key is operated when recording a PCM audio signal, and if there is an unrecorded track, An arbitrary track therein is automatically selected for signal recording.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the case where the present invention is implemented in a magnetic recording/reproducing apparatus equipped with a 3 mm VTR and a PCM multi-track system recording/reproducing function. In Figure 1,
10 is the key power section, 8mm VTR mode or PC
Mode switch 1, 1st to select and specify M multi mode
~ PCM track designation key 2 to specify the 6th PCM track, QREC (QU
ICK RECoRD) key 3, P to instruct playback operation
LAY key 4, RFC key 5 for instructing normal recording operation
It is equipped with various operation keys such as. The operation signal of each key in the key manual section 10 is transmitted to the system controller 1-1.
sent to. The system controller 11 outputs a display signal to the display drive circuit 12 in response to key operations, etc., and also outputs a signal corresponding to the track designated by the PCM track designation key 2 to the PCM control signal generation circuit 13. Further, the system controller 11 generates a mode designation signal V for switching the mode in response to the operation of the mode switch 1, and a recording/playback signal R for designating switching between recording and reproduction in response to the operation of the PSPLAY key 4 or the RFC key 5, etc. When the /P and QREC keys 3 are operated, a check phase signal QR, etc. which becomes high level for a part of the time is output. and,
The display drive circuit 12 drives the display unit 14 to display a display according to a signal from the system controller 11. On the display section 14, first to sixth track display sections 15 are printed on the central part thereof and are formed to be inclined to correspond to the PCMl-racks on the tape, and on both sides of each display track. A recorded track indicator 16 and a currently playing track indicator 17 are provided. Also, the above PCM! I
As shown in FIG. 2, the IIII signal generation circuit 13 generates track selection signals PSW1 to PSW6, A, B, which are delayed according to the designated track from the head switching signal H8W sent from the servo circuit (not shown). Rotating head of the channel) - IA, ) (track pulse PT synchronized with each successive track by B, rotating head) (first to
While reading the record of the sixth track, a check timing signal C8W which becomes high level is output. In this case, the track selection signal PSW1 is the head switching signal H.
It is output with the same phase as 8W, and PSW2 to PSW6 are 36
The output is sequentially delayed by ° minutes. The head switching signal H8W has a high level and a low level of 180, respectively.
°, that is, 16,6m5ec corresponding to 1 field
It has a time span of .

The above-mentioned rotating heads HA and HB are mounted on a rotating drum (not shown) with an interval of 180 degrees maintained therebetween, and this rotating drum is controlled by a servo circuit in synchronization with the above-mentioned head switching signal 1-(SW). The rotating drum is rotated at a constant speed.An 8 mm video tape is wound diagonally around the rotating drum at an angle of 221 degrees, and is driven one line at a constant speed.Therefore, as shown in FIG. 6m as shown
On the m-videotape 18, tracks 19 inclined at a constant angle are sequentially formed in parallel corresponding to the two rotary heads HA and HB. The recording track 19 is P
In the CM multi-track system, the track is divided into first to sixth tracks Tri to Tr6 by 36 degrees. The first track Tr1 is a PC normally installed on an 8mm videotape.
M audio track, 2nd to 6th track Tr2 to T
r6 is a track formed in a 180° video area.

Further, in FIG. 1, 21 is a recording video signal input terminal;
22 is a recording audio signal input terminal, the video signal externally input to the terminal 21 is sent to the video signal recording circuit 23, and the recording audio signal externally input to the terminal 22 is P.
It is sent to the CM recording circuit 24. Then, the output signal of the video signal recording circuit 23 is amplified by the amplifier 25, and then
The signal is input to a common terminal of a changeover switch 27 via a changeover switch 26 . The changeover switch 26 is controlled by the control signal V/P output from the system controller 11.
It is used to switch between the TR terminal and the PCM terminal, and the VTR terminal is connected to the common terminal of the changeover switch 27. This changeover switch 27 is set to a common "" by head changeover signal H8W.
The terminal is switched and connected to terminal H or terminal R.

The PCM recording circuit 24 operates in synchronization with the track selection signal PSW output from the PCM control signal generation circuit 13, and outputs a recording audio signal at the timing of the designated track. The recorded audio signal outputted from this PCM recording circuit 24 is inputted to a common terminal of a changeover switch 29 via an amplifier 28. This changeover switch 29 is connected to the PCM@'IIJ signal generation circuit 13.
The common terminal is connected to the terminal H or both terminals in accordance with the track selection signal PSW output from the switch 27, and that terminal is connected to the common terminal of the changeover switch 31 together with the terminal H of the changeover switch 27. In addition, the changeover switch 29
The terminal H of the switch 27 and the terminal H of the switch 32 are connected to a common terminal of the switch 32 . Above selector switch 3
1.32, the common terminal is set to terminal R or terminal P by the control signal R/P output from the system controller 11.
The terminal R is connected to the rotating head HA.
1He, respectively.

Therefore, in the playback mode, the rotating heads HA, HB
The signal read out from the videotape by the switch 33.34 is input to the amplifier 35.36 via the terminal P of the changeover switch 33.34. The common terminal of the changeover switches 33 and 34 is connected to the terminal P or terminal R in response to the recording/playback signal R/P output from the system controller 11. The output signals of the amplifiers 35 and 36 are input to the PCM reproducing circuit 39 or the video signal reproducing circuit 40 via changeover switches 37 and 38. The changeover switch 37 has a common terminal connected to the terminal H or the terminal 35 in accordance with the track selection signal PSW from the PCM control signal generation circuit 13. The terminal 37 is connected to the amplifier 35, and the terminal H is connected to the amplifier 36. connected to. Further, the change-over switch 38 is configured to switch the common terminal to the terminal H or the terminal L according to the head switching signal H8W, and the terminal H is connected to the amplifier 35 and the terminal R is connected to the amplifier 36. Then, the PCM reproducing circuit 39
The input signal is reproduced according to the track selection signal PSW outputted from the control signal generation circuit 13, and outputted to the audio signal output circuit (not shown) via the output terminal 41. Further, the video signal reproducing circuit 40 receives the VTR/PCIVt signal V/P from the system controller 11.
The video signal is reproduced in the R mode and output to a video signal processing circuit (not shown) via the output terminal 42.

Further, the output signal of the amplifier 35 is input to a gate circuit 43. This gate circuit 43 receives a check timing signal C from the PCM control signal generation circuit 13.
While 8W is at a high level.

An input signal is selected and input to the bandpass filter 44. This bandpass filter 44 has M, T, and S, for example, 2
It is for extracting only the identification signal of 28.748 KHz, and after the output signal is detected by the diode 45, it is sent to the Schmitt circuit 47 via the low-pass filter 46. This Schmitt circuit 47 shapes the waveform of the input signal and outputs it to a 6-bit shift register 48. Further, the clock terminal of this shift register 48 has P
The check timing signal C8W and the track pulse PT output from the CM III m signal generation circuit 13 are inputted via the AND circuit 49. The shift register 48 sequentially reads and shifts the input signals in synchronization with the track pulse PT input through the AND circuit 49, and outputs each bit output to the 6-bit latch circuit 50. Further, the head switching signal H8W and the control signal QR output from the system controller 11 are input to the clock terminal of the latch circuit 50 via the AND circuit 51. The latch circuit 50 reads the output signal of the shift register 48 in response to a signal applied via the AND circuit 51 and outputs it to the system controller 11. The system controller 11 determines the unrecorded track from the latch data of the latch circuit 48, displays the determination result on the display section 14, and starts recording on the lowest track among the unrecorded tracks.

Next, the operation of the above embodiment will be explained. When recording/playing video signals, install a 6mm cassette tape.
The mode switch 1 in the key manual section 10 is switched to the VTR side. When the VTR mode is designated by the mode switch 1, the PCM III m signal generation circuit 13 outputs the track selection signal pswi at the same timing as the head switching signal H8W. And video chi 71
If you want to play back the video signal recorded in 8, select P.
If the LAY key 4 is to be operated and a video signal is to be recorded, the PLAY key 4 and the REC key 5 are to be operated at the same time.

When a video signal is reproduced, the R/P signal output from the system controller 11 turns off the changeover switches 31.32 and turns on the changeover switches 33.34. Therefore, the rotating head HA.

The signal read from HB is amplified by amplifiers 35.36 and input to switch circuits 37.38. The changeover switch 37 receives a track selection signal PS shown in FIG.
The switching is controlled by W1, and the rotating heads HA, H
The PCM audio signal of the first track Tr1 read by a is selected and inputted to the PCM reproduction circuit 39. This PCM reproducing circuit 39 reproduces the PCM audio signal input via the changeover switch 37 in synchronization with the track selection signal PSW1, and outputs it from the terminal 41. The changeover switch 38 also outputs a head changeover signal H3.
Switching is controlled by W, and the video signals read from the tracks Tr2 to Tr6 by the rotary heads HA and HB are output to the video signal reproducing circuit 40. The video signal reproducing circuit 40 reproduces the video signal and outputs it from the terminal 42 only when the VTR mode is designated.

In addition, when recording a video signal on the video chip 718,
In the above VTR mode, press PLAY key 4 and RFC key 5.
operate at the same time. The recording mode is specified by the above key operation, and R is output from the system controller 11.
The /P signal switches the changeover switches 31 to 34 to the R side terminal, turning the changeover switches 31.32 on and off, and the changeover switches 33.34. Therefore, the video signal input to the terminal 21 is transmitted to the video signal recording circuit 23 and the amplifier 2.
5. The signal is input to the changeover switch 27 via the changeover switch 26. This changeover switch 21 receives a head changeover signal H8.
The video signals amplified by the amplifier 25 are alternately outputted to the rotary head HA 18B and recorded on the tracks Tr2 to Yr6 of the video tape 18. Also,
At the same time, the audio signal input to the terminal 22 is input to the changeover switch 29 via the PCM recording circuit 24 and the amplifier 28. This changeover switch 29 is switched in synchronization with the track selection signal PSW1 to select the first track on the video tape 18.
A PCM audio signal is recorded on track Tr1.

When recording/playing only audio signals, attach an 8mm cassette tape for audio signal recording, switch to PCM mode with mode switch 1, and select and designate the desired track with PCM track designation key 2. .

When a desired track is designated by the PCM track designation key 2, the PCM control signal generation circuit 13 generates a track selection signal @PS according to the designated track as shown in FIG.
W1 to PSW6 are output.

In this state, by simultaneously operating the PLAY key 4 or the PLAY key 4 and the REC key 5, audio signals are read or recorded on the designated track.

Next, we will explain the operation in case of emergency recording of FM broadcast programs etc.
This will be explained with reference to the flowchart shown in the figure.

If you want to urgently record FM broadcast programs, etc., use PCM.
In the state where the mode is specified, the key human power section 10
Operate QREC key 3 in .

When the QREC key 3 is operated, the system controller 11 first executes the playback operation for N seconds, for example, 1 to 2 seconds, as shown in step A1 in FIG. Set the QR double signal to high level.

In the above playback mode, the selector switches 31 and 32 are turned off.
The changeover switches 33 and 34 are turned on, and the rotating head 1-
(The data read from A, 1-IB is
3.34 to amplifier 35.36. The output signal of the amplifier 35 is then input to the gate circuit 43.

This gate circuit 43 opens its gate while the check timing signal C8W given from the PCM control signal generation circuit 13 is at a high level to control the first to sixth tracks Tr1 to Tr6 that are successively output from the head HA.
Select and output recorded data. The recorded data of the first track Tr1 to the sixth track Tr6 selected by the gate circuit 43 is sent to the band pass filter 44, and as shown in FIG. T, S, that is, 228.748
Only the KHz identification signal is taken out. The output signals of the bandpass filter 44 in FIG.
This figure shows signal waveforms when data is recorded on tracks Tr1, Tr2, and Tr5. The identification signal output from the bandpass filter 44 is
After being detected by the diode 45, the signal is sent to the Schmitt circuit 47 via the low-pass filter 46. Therefore,
The Schmitt circuit 47 outputs a II 111 signal (high level) or a ``0'' signal (low level) depending on the recording state of the identification signal in the first track Tr1 to the sixth track Tr6 of the video tape 18. That is, the Schmitt circuit 47 outputs a ``1'' signal to the track where the identification signal is recorded, and a ``0'' signal to the track where the identification signal is not recorded, and the shift register 50 While the check timing signal C8W is at a high level, the track pulse PT from the PCM control signal generation circuit 13 is sent to the clock terminal of the shift register 50.
It is input via 9. Therefore, the shift register 48 receives the track pulse P input via the AND circuit 49.
Read the output signal of Schmitt circuit 4B in synchronization with T,
Shift sequentially. When the data corresponding to the first track Tri to the sixth track Tr6 is read into the shift register 48, the check timing signal C8W becomes low level, and the gate circuit of the AND circuit 49 is closed.

At the same time, since the head switching signal H8W falls, the output signal of the AND circuit 51 falls, and in synchronization with the falling, the data held in the shift register 48 is latched by the latch circuit 50 and sent to the system controller 11. After executing the reproduction operation for N seconds as described above, the system controller 11 sets the QR multiplication signal to a low level as shown in step A2 of FIG. 4, and then stops the tape running in step A3. Then, in step A4, the system controller 11 determines whether there is an unrecorded track based on the latch data of the latch circuit 50. For example, if a PCM audio signal has already been recorded in Trl, Tr2, and Tr5 of the first track Tr1 to the sixth track Tr6 as described above, the first and second tracks of the latch circuit 48 as shown in FIG. 2. ``1'' in the 5th bit
The PA signal is latched. Therefore, the system controller 11 can determine recorded tracks and unrecorded tracks based on the latch data of the latch circuit 50.

In this case, the system controller 11 controls the latch circuit 5
If the latch data of 0 is all "1", it is determined that there is no unrecorded track, and the process proceeds to step A5, where all the recorded track indicators 16 of the display section 14 are driven to display, and the process is immediately terminated. If the system controller 11 determines in step A4 that there is an unrecorded track from the latch data of the latch circuit 50, it proceeds to step 80 and specifies the lowest track.For example, Tr3, Tr4, Tr6. If the track is unrecorded, the PCM control signal generating circuit 13 outputs the track selection signal PSW3 to designate the third track Tr3.Then, the process advances to step A7, and the recorded track indicator 16 is The display bodies corresponding to the tracks Tri, Tr2, and Tr5 are driven to display, and the third track Tr
The track display body 17 corresponding to No. 3 is driven to display. Next, the process proceeds to step 88, where the PCM recording circuit 24 starts recording the audio signal on the third track Tr3. That is, the PCM recording circuit 24
The audio signal input to PSW 2 is pulse width modulated and output in synchronization with the track selection signal PSW3. The PCM audio signal output from this PCM recording circuit 24 is amplified by an amplifier 28, then alternately switched by a changeover switch 29 in synchronization with the track selection signal PSW3, and input to the rotary heads HA and HB. It is recorded on the third track Tr3 of the video channel 718. When the QREC keys 3 are operated as described above, an unrecorded track is automatically detected, and a PCM audio signal is recorded on the lowest track among the unrecorded tracks.

Note that in the above embodiment, when an unrecorded track is detected,
Although the audio signal is recorded on the lowest track, the recording of the signal is not limited to the lowest track, and it goes without saying that the signal may be recorded on any other track.

[Effects of the Invention] As described in detail above, according to the present invention, by operating the QREC key 3, an unrecorded track is automatically detected by performing a playback operation for, for example, 1 to 2 seconds, and the unrecorded track is automatically detected. Since audio signals can be recorded by specifying any track among the recording tracks, for example, when urgently recording an FM broadcast program, you can reliably select an empty track even if you do not know the recording status of the tape. This eliminates the inconvenience of accidentally erasing important recordings.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a block diagram showing the circuit configuration, FIG. 2 is a timing chart for explaining the operation, and FIG. 3 is a PC diagram for video tapes.
FIG. 4, which is a diagram showing the M multi-track format, is a flowchart showing the operation when performing emergency recording. 1...Mode switch, 2...PCM track specification key, 3...QREC key, 4...PLAY key,
5...REC key, 10...Key human resources department, 11...
・System controller, 12...Display drive circuit, 1
3... PCM suppression signal generation circuit, 14... Display unit,
15... Track display section, 16... Recorded track display body, 17... Track display body being played back, 18...-
Video tape, 19...track, 21.22...
Recording signal input terminal, 23...Video signal recording circuit, 24
...PCM recording circuit, 25.28.35.36...
Amplifier, 26.27.29.31-34.37.38・
...Selector switch, 39...PCM regeneration circuit, 40.
...Video signal reproduction circuit, 43...Gate circuit, 44.
・・Band pass filter, 4G river low pass filter, 4
7...Schmitt circuit, 48...shift register,
50...Latch circuit. Applicant's agent Patent attorney Takehiko Suzue Figure 3 Figure 4

Claims (1)

[Claims] In the PCM multi-track method, one track is divided into multiple tracks, and the signal is time-compressed and recorded in PCM for each track, and an identification signal of a predetermined frequency is frequency-multiplexed recorded. means for temporarily setting the playback state; means for detecting the recording state of each track of the tape based on the presence or absence of the identification signal during the playback; and selecting one of the unrecorded tracks according to the detection result of the means; 1. A recording track control device comprising: means for controlling a track to be recordable.