JPS60177459A - Pcm recorder of fixed head type - Google Patents

Abstract

PURPOSE:To record and reproduce head positioning signals of music without degrading the recording density of a tape by recording a synchronizing signal and an analog head positioning control signal having a single frequency (f) when an inter-music part of a music signal is detected and detecting the analog signal with a prescribed BPF at a reproducing time. CONSTITUTION:The music signal inputted to an analog signal input terminal 2 passes an amplifier 10 and a rectifier 11 and is compared with a prescribed voltage by a comparator 12; and if it is lower than the prescribed voltage, a timing circuit 13 detects an intermusic part, and a head positioning signal generating circuit 15, a modulating circuit 6, and a switch 17 are controlled to record the synchronizing signal and the analog head positioning control signal having the single frequency (f) on a prescribed track if this state continues for a prescribed time. In case of high-speed search where the tape speed is N-number of times as high as the normal speed, recorded signals on a magnetic tape 9 are read out by a reproducing head 19, and head positioning signal is extracted by a regenerative amplifier 20 and a BPF26 having a center frequency fxN and is compared with a reference signal by a comparator 27; and if the head positioning signal is discriminated, it is sent to a control circuit 28.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a PCM recorder that converts music signals into digital signals and records them. Turn on the recorder.

[Background of the invention]

In a recording/reproducing apparatus t using magnetic tape, the access time is inherently slow, resulting in a large delay in use. To solve this problem, conventional analog day recorders have used the following first-order method.

The t-thread signal recorded on the magnetic tape is lost 8 times at a faster than normal speed, and this reproduced signal is rectified and converted into a DC voltage. At this time, if the signal amplitude remains small for 731T, this is regarded as an interval between songs, and the beginning of the song is searched.

Although this method has the advantage of requiring less manual operation during recording, it has the major disadvantage that when the length of one song is short, it becomes difficult to get used to it and malfunctions.

In addition, since the PCM recorder records the music signal not continuously but as discrete data, it is possible to include control signals for review and other control signals in the data when recording.

Especially in the case of rotary head mpcM recorders.

The above method is effective because it has the advantage of being able to read recorded signals at the same frequency as during normal running even if the magnetic tape is made to wander as usual.

FIG. 1 shows an example of the tape format of the Kaiju head tllpcM recorder. -1 In Figure 1, the control signal for control signal Ca1) is attached to the control signal for discharging the sword.

However, in the case of a fixed head 1) C'M recorder, if the magnetic tape is run more erratically than usual.

The frequency ratio of the Nyu signal frequency [forgivably, it will be too long, so if you record the control signal for dispensing at the same frequency as other PCM data, the control signal for dispensing from the main output when the horse runs continuously. There is a problem that it is difficult to obtain γL. Conventionally, this problem has been dealt with by dedicating several tracks to control signals in a tape pattern formed by multi-tracks.

Figure 2 shows 1-
An example of this format is shown below. Return to Figure 2 and select S Y
N (,' is the synchronization signal of each track.

C'& D are information for weaving and controlling the contents of the king data, )) ATA is the king data, and C is data for error detection 1 correction. As a side note, the AUX track in the figure is iclidm S, and is illuminated when driving in a erratic manner.

However, this method has the disadvantage that six tracks are required for the cue signal, which slows down the tape recording performance.

[Object of the Invention] The object of the present invention is to eliminate the above-mentioned drawbacks of the conventional mosquito control method, and to develop a structure that allows for the recording of tapes with a high density of 7x. There is a V company that provides head MP CM recorders.

[@Akira's summary vcJ The present invention uses a synchronization signal and a single frequency when detecting a music signal between songs) 7. &: When recording tic 8 on at least one track of the number N and detecting it at N times the number N of running back at the time of Nyu, the center frequency is set to fxN. By the bandpass filter,
This is due to the fact that the above analog signal was used during the TS to coincide with the song interval.

[Embodiments of the invention]

The following 1 center 1M of the present invention? Celebrate Il according to the diagram.

FIG. 3 shows an embodiment of a block signal band according to the present invention. In figure jg6, the cue signal is.

C&D, 1) ATA, recorded in CRCCO location.

The improvement will last for a long time to the extent that there are 2 to 5 lbt people in one block. For example, if the tape speed is 4.75 cn
When considering the y's system, one block length is generally about 100 μm, so the number N for one horse is I.
About KHz (temporarily set at 47.5μrIL) is good. Further, although the recording waveform is shown as a sine wave in FIG. 3, other waveforms such as a rectangular wave may also be used.

Generally, when recording a music signal, two methods can be considered. The first is when the songs are recorded continuously without stopping the recording medium midway, and the second is when the recording medium is stopped one concave at a time and six songs are recorded.

First, the tenth method will be explained. Regular analog records and compact discs have two unrecorded sections, ie, songs 1 & 1. In the present invention, the gap between BH is made clear by repeatedly recording the signal that is blank in this 2 seconds 1w''K m 3 diagram.

FIG. 4 shows an embodiment of the tape format according to the present invention. In Figure 4, an example is shown in which the start-up signal is recorded on track 10, but it may be recorded on other plural tracks in the same way, taking into consideration tape drop-out and head conditions.

If it detects the digital "o" aw in the f-Rakuiba, or detects that the amplitude of the cabinet or analog signal is smaller than the predetermined 1 section, and the detection state continues. Company 1 song A has finished Toko Nashi, track 1oVcgJ
Record the 4 output signal. This state continues until the next song B is enclosed, and 101, which is similar to deinotal, is recorded on the data frame of the other track. Naka, block number is 50utlz.

Song 11! If IJ is 2 seconds, 1ooo block V
The first drum number issued by C will be recorded by B.

It was. In Fig. 4, the number 100 of Todashi is an example of recording with 1 with -B circled from the time when it is detected that song A has ended, but it is not necessary to set PJi to this, even if it is You may record as many times as you like from the moment one song A ends (for example, 1 second...).At this time, if the next song starts within a short period of time, start the next song immediately. Try to be able to cut 9 lines into 6 pieces of a song.

Figures 5 and 7 show the circuit configuration for obtaining the tape format shown in Figure 4. In Figure 5, 1 is a tintal signal input terminal, 2 is an analog signal input terminal, 3 is an A-1) converter, 4 is a switch, 5 is a hoeing thread tit/tal signal processing circuit, 6 is a modulation circuit, 7 8 is a multi-track recording head, 9 is a magnetic tape, 10 is a platform @t, i, 11 is a rectifier, 12 is a comparator, 1
3 is a timing generation circuit, 14 is a digital fo1 detection circuit, 15 is a cue signal generator, and 16 is a digital 10
1 is Zhuangyuan Road, 17 is the switch, and 18 is the recording switch.

The music signal input from analog signal input terminal 2 is A-4.
) is converted into a digital signal by the conversion i6, and is transferred to the recording thread digital via the switch 4.17 (No. N processing circuit 5, courage (ro) route 6. recorder 17. multi-track recorder head 8) and the magnetic tape 9. It will be recorded.

The music signal generated by the digital No. 01 human power sardine 1 is also recorded in the magnetic chip 19 through the switch 4 and a similar circuit.

[For detection between 11I and 11I, if the human signal is analog,
First, the amplifier 1o amplifies it, the rectifier 11 converts it into a straight nine, and the comparator 12 compares it with the normal pressure.

b "When the voltage becomes smaller than the constant voltage, the status is sent to the timing generation circuit 16. Also.

If the human input signal is digital, the digital 101 detection signal generating circuit 13. send. The timing generation circuit 13 is.

When the inter-track detection state continues for a certain period of time, the loading/unloading signal generating circuit 15, modulating circuit 6, and switch 17 are controlled to record a signal as shown in FIG. 3 on a predetermined track. A digital aO° is recorded on the track.

Next, we will discuss the second recording method described above, in which recording is performed by stopping the recording medium after 1".

The sixth factor is an example of the first format when the tape is stopped at t-, ji+ and recording is started. The difference from the 2i84 version is that when the tape stops, an unrecorded area is created in the IC, as shown in the figure.

When recording is stopped by the user, - a cue signal is sent to the specific track, or a digital e-mail is sent to the other tracks.
O t is recorded. When recording is started again next time, the review signal and digital "o1" are recorded as described above until the beginning of one song is detected.

In FIG. 5, when the recording switch 18 is released, the timing circuit 16 switches the switch 17° to the cue signal generator 15. Control the variable B14 circuit 6.

The cue signal and the digital 0° are recorded for 114 J at a certain time, and then the chive running yarn is stopped. Next, when the recording switch 18 is turned on, the above recording continues until the start of a song is detected.

In Figure 7, the same part as the fifth factor was shown in the same previous issue. In both circuits shown in FIG. 5, the no-signal level is the amplifier 10, the rectifier 11. Although this is performed by the analog circuit of the comparator 12, in FIG. The operation is the same as in the case of digital signal input described above. However, if the input signal is an analog signal, the output of the AI) signal generator 3 may not be digital 0", and even if the input signal is a digital signal, the digital 0" detection circuit may Since it is conceivable that the digital signal ``ol'' may not be outputted, a signal of the comparator 11 at 5 may be detected at a level below the normal level.

The method of recording the one-heading signal has been explained above, but first, the method of actually performing FIRtB by cylinder speed search will be explained.

The 81st example is an embodiment of the reproducing circuit. In FIG. 7, 9 is a magnetic tape, 19 is a multi-track playback head,
20 is a reproduction amplifier, 21 is a waveform equalizer, and 22 is a reproduction WM@
23 is a reproduction system signal processing circuit, 24 is a D-Af converter,
25 is an output terminal, 26 is a band pass filter, a 2-channel filter, 28 is an output signal control circuit, and 29 is a tape running thread mechanism.

First, the normal playback mode will be explained.

The signal recorded on the cicada tag 9 is read out by a multi-track playback head and amplified by a playback amplifier 20.

After the waveform equalizer 21 removes regional attenuation and intersymbol interference occurring in the tape head transmission system, the demodulation circuit 22.
After passing through the reproduced yarn signal processing circuit 23 and the DA converter, the signal is reproduced from the output terminal 25 as the original music signal.

At this time, the digital data “0” recorded as described above,
Alternatively, the reproduction system signal processing circuit 23 may be controlled so as not to forcibly output the audio signal when the cue # signal is re-generated for a certain period of time.

Next, the Sl speed search will be explained. In the case of a high-speed search, recorded answers are read out at about 30 times the normal tape speed, so the cue signal recorded in the present invention is 501 times faster than normal tape speeds.
It is internally generated as a Jz signal. In other words, this 30KHz
When this signal is reproduced, it is determined that it is a song interval, and as soon as the tape is stopped, the first song gap is searched. At this time, the reproduced signal frequency is 50KH2, but the wavelength is 4Z
Since the wavelength is 5 μm and there is almost no attenuation due to the wavelength, reproduction can be performed with a good S/N ratio.

Here, the center frequency of the bandpass filter 26 is 30KH.
z, extracts only the cue signal, and inputs it to the comparator 27 connected to the primary. The reference voltage of the comparator 27 falls between the 30H2 component of the spectrum in 1 normal reproduction and the cue signal reproduction level.

When it is determined that it is a cue signal, the cue signal control circuit 2
A control signal is sent to 8. The cue signal control circuit 28 is
If a cue signal is detected, the tape running system mechanism section 29 is immediately controlled to switch to normal running or stop running. Next, the play string signal processing circuit 23 searches for the COD code of the song that has started, and if it is determined that the song is not the desired song, a control signal is sent to the cue signal control circuit 28 to start the high-speed search. To get it started.

Controls the tape running system mechanism section 29. The above operations can be repeated until the desired song is retrieved. Note that during high-speed search, the reproduction system signal processing circuit 23 is controlled to
)-A'l converter 24 is either sent with a digital value of "0" or is forcibly made not to output any sound.

Also, although 1 or more has been described for fast forward high speed search, the starting signal is the same for 1 rewind high speed search as well.
Since it is reproduced as a KHz signal, it is possible to produce 13N songs with similar creations.

〔Effect of the invention〕

According to the present invention, since a song cue signal is recorded on a data track, there is no need for a track dedicated to cue signals, and the recording efficiency of the tape can be increased. Even if the interval between songs is short, it can be detected at the same time, so detection errors can be eliminated.

[Brief explanation of the drawing]

Figure 1 is a diagram of the tape format of a rotary head mPcM recorder, and Figure 2 is a diagram of the tape format of a conventional fixed head PCM recorder. Fig. 6 is a diagram showing an embodiment of the signal configuration of one tape according to the present invention, Fig. 4 is a diagram showing an embodiment of the tape format according to the present invention, and Fig. 6 is a diagram showing another embodiment of the tape format according to the present invention. FIG. 7 is a diagram showing another embodiment of the recording circuit according to the present invention. FIG. 8 is a diagram showing another embodiment of the recording circuit according to the present invention. FIG. 2 is a diagram showing an example of a reproducing circuit. 1...Digital signal input terminal 2'...Analog signal input terminal 3...AD converter 4...Switch 5...Recording thread Digital signal processing circuit 8...Multi-track recording head 9... ... Magnetic tape 10 ... Multiplier 11 ... Rectifier 12 ... Comparator 13 ... Timing generation circuit 14 ... Digital 101 detection circuit 15 ... Cue signal generator 16 ... Digital 101 generation circuit 17...Switch 18...Recording switch 19...
・Multi-track playback head 23...Regenerated yarn signal processing circuit 24...DA converter 25...Output terminal 26...
Bandhus filter 27...Comparator 28...Cueing signal 1tllI@
1 circuit 29... tape running thread a kabumine 111iii] tane 2 times Akira 3 figure 4 goes to song Itofuyu 3 song B starts! 5 Continuation of Figure 1 4,000 off λπ also S
Hitachi, Ltd., Home Appliance Research Laboratory, Akiji Research Institute

Claims (1)

[Claims] A fixed head having a plurality of tracks per traveling direction of a magnetic tape is provided, and digitized audio and additional information are recorded and reproduced on the magnetic tape by the fixed head. A detection device that detects the No. 8 state with no audio information, and a detection device that detects the No. Regarded as a signal between songs (between songs),
A start-up signal recording control circuit that records a start-up control signal in place of the audio 1w signal on at least one track or more, and a start-up signal recording control circuit that detects the start-up control signal during playback and performs the desired operation. A ti!ij fixed head gpcM recorder, characterized in that it is equipped with a fixed-head signal reproduction control circuit that performs this.
In the recorder, the 100th No.
This is a fixed running head wrinkle PCM recorder that is patented to consist of an analog signal or a digital signal with a single frequency of /31T. 3. In the inner rectangular head type PCM recorder described in claim A2, N+¥! during normal running! When performing quick cueing, the center frequency is jXN in the cueing signal reproduction control circuit. In addition, in the fixed head type PCM recorder described in the first row of the scope 2, if the audio information is a digital signal, the output circuit uses digital 101 or a base in the vicinity thereof, In this case, a fixed head PCM recorder that does not rely on detection at a level below 7311 or a digital 101 or a nearby level.