JPH06150544A - Signal recording and reproducing system - Google Patents

Abstract

PURPOSE:To decelerate a required speed by returning respective outputs of plural converter circuits to an original frequency band with regenerative frequency converter circuits and synthesizing these outputs. CONSTITUTION:An analog signal with a high speed and a wide band is inputted to an input terminal 11 and distributed to (n) by a distribution circuit 13. Further, the (n) channel analog signals with the high speed and the wide band are inputted to the input terminals 121-12n, and whether the (n) distribution outputs of the circuit 13 are recorded or the (n) channel inputs are recorded is selected by switches 141-14n. The selected analog signals are converted to the same frequency band with a low band and a low speed by frequency converter circuits 151-15n. The output signals become digital signals by A/D converter circuits 161-16n, and (n) channel parallel inputs are synchronized by a recording control circuit and recorded in a storage 18 as serial data. The recording data are returned to the original frequency by regenerative frequency converter circuits 211-21n and synthesized a synthesizer circuit 22. Then, an operational speed is lowered at the low frequency band.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal recording / reproducing system for converting an analog signal of a high frequency wide band into a digital signal and recording / reproducing it.

[0002]

2. Description of the Related Art As is well known, when a high frequency and wide band analog signal is continuously converted into a digital signal for recording, sampling is performed at a sampling frequency matching the signal frequency, and A / D (analog / digital) After conversion,
The data is input to the storage device and recorded.

However, in the above signal recording / reproducing system, the higher the frequency of the input signal, the higher the sampling frequency, and the operating speed required for the A / D conversion circuit and its peripheral circuits to realize it. Very fast, and sometimes difficult to achieve.

When a signal to be recorded has a long time, a magnetic tape or the like having a large storage capacity is used as a storage device. However, at high speed, multi-channel simultaneous recording cannot be realized and a plurality of storage devices can be used. It is necessary to operate in parallel.

[0005]

As described above, in the conventional signal recording / reproducing system, the sampling frequency must be increased as the frequency of the input signal becomes higher.
The operation speed required for the A / D conversion circuit and its peripheral circuits becomes very high, and when the recording time is long, the high speed operation makes it impossible to realize multi-channel simultaneous recording.
It becomes impossible to use a storage device having only one input channel.

The present invention has been made in order to solve the above problems, and can reduce the speed required for the A / D conversion circuit and its peripheral circuits, and has a memory having only one input channel. An object is to provide a signal recording / reproducing system capable of simultaneously recording a plurality of different signals on a device.

[0007]

In order to achieve the above object, a signal recording / reproducing system according to the present invention provides a distribution circuit for distributing one input analog signal to a plurality of channels, and a distribution circuit provided for each distribution channel of the distribution circuit. A plurality of recording frequency conversion circuits for converting an input signal into a narrow band signal at a low frequency, a plurality of analog / digital conversion circuits for converting each output of these conversion circuits into a digital signal, and these conversions A storage control circuit for synchronizing and serializing each output of the circuit, and a storage device for recording the circuit output,
A reproduction control circuit that parallelizes the reproduction output of the storage device to return to a plurality of channel signals, a plurality of digital / analog conversion circuits that are provided for each output channel of this circuit, and that convert into corresponding channel signals, respectively. A plurality of reproduction frequency conversion circuits for returning the respective outputs of the conversion circuits to the original frequency band, and a combining circuit for combining the outputs of these conversion circuits.

[0008]

In the signal recording / reproducing system having the above structure, one high frequency wide band analog signal is distributed to a plurality of channels, and a frequency conversion circuit provided for each distribution channel converts the analog signal into a narrow band signal at a low frequency. After being converted into a signal, they are synchronized and serialized and recorded in a memory device, and the reproduction output of this memory device is parallelized and returned to a plurality of channel signals, and D / A for each output channel.
It is characterized in that high-frequency wideband signals are recorded and reproduced by converting, returning to the original frequency band, and synthesizing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an apparatus configuration using the signal recording method according to the present invention. A high-speed broadband analog signal is input to the input terminal 11, and the distribution circuit 13
To be distributed. On the other hand, high-speed wideband n-channel analog signals are input to the input terminals 121 to 12n, respectively. The switches 141 to 14n select whether to record the n-divided output of the distribution circuit 13 or the n-channel input.

The analog signals selected by the switches 141 to 14n are converted into the narrow and narrow same frequency band by the frequency conversion circuits 151 to 15n, respectively. Bands obtained by dividing the frequency band of the input signal into n are sequentially assigned to the respective circuits. FIG. 2 shows the situation, and shows that the input signal is continuous from the frequencies fL to fH, a part of the high frequency band is cut out, and is converted into the low frequency band.

The output signals of the frequency conversion circuits 151 to 15n are converted into digital signals (data) by the A / D conversion circuits 161 to 16n and sent to the recording control circuit 17. The recording control circuit 17 synchronizes an n-channel parallel input with a synchronizing circuit, and further converts it into serial data in a predetermined recording format. The converted data is recorded in the storage device 18 having a magnetic tape or the like as a storage medium.

When the recorded data is reproduced from the storage device 18, the reproduced data is returned to the original n-channel parallel data by the reproduction control device 19. Each channel data is converted into a D / A (analog / digital) conversion circuit 20.
The signals are converted into analog signals at 1 to 20n and sent to the frequency conversion circuits 211 to 21n, respectively.

Each of the frequency conversion circuits 211 to 21n has a conversion function opposite to that on the input side, and converts the input signal to the original frequency. The outputs of the frequency conversion circuits 211 to 21n are combined by the combining circuit 22 and derived from the output terminal 23 when the recording data is n distribution input. Also,
When the recording data is n-channel input, it is directly derived from the output terminals 241 to 24n.

That is, in the signal recording / reproducing apparatus having the above-mentioned structure, the high-speed wideband analog signal from the input terminal 11 is distributed to the distribution circuit 13 by n, while the input terminals 121 to 12 are distributed.
The switches 141 to 14n can arbitrarily select whether to record the n-divided output of the distribution circuit 13 or the n-channel input, by treating it as a high-speed wideband n-channel signal from n.

The selected analog signal is converted into a narrow and low same frequency band as shown in FIG. 2 by frequency conversion circuits 151 to 15n which respectively handle different frequency bands, and further A / D conversion circuits 161 to 161. In 16n, each is converted into a digital signal (data). The A / D converted data of each channel is synchronized by the recording control circuit 17, converted into serial data, and recorded in the storage device 18.

The reproduction output of the storage device 18 is the reproduction control device 1.
At 9, the original n-channel parallel data is restored and converted into analog signals by the D / A conversion circuits 201 to 20n. These are low-speed narrow-band signals, which are respectively converted by the frequency conversion circuits 211 to 21n in the opposite manner to those on the input side and thereby returned to the original frequency band.

Here, each frequency conversion output is combined with the synthesizing circuit 22.
If combined with, it can be taken out from the output terminal 23 as a reproduction signal of a high-speed wideband analog signal input to the input terminal 11. Further, by directly taking out the respective frequency conversion outputs from the output terminals 241 to 24n, it is possible to obtain the reproduced signals of the n-channel analog signals input to the input terminals 121 to 12n.

As described above, in the signal recording / reproducing apparatus having the above configuration, the operating speed required for the A / D conversion and the D / A conversion is lowered by converting the frequency of the input signal into the low frequency band. ing. Furthermore, by dividing the bandwidth narrowly, it is easy to realize the entire circuit,
It contributes to the improvement of signal quality.

The ability to simultaneously record a plurality of different signals on one channel is most effective in applications where reproducibility of the temporal relationship between signals is important, and storage medium management becomes easy. There is also an advantage.

Therefore, the signal recording / reproducing system for realizing the above device can convert a wideband high frequency analog signal into a digital signal for recording / reproducing without using an ultra-high speed A / D conversion circuit. It is possible to record and reproduce a plurality of different analog signals in a storage device having only one channel input.

It is needless to say that the present invention is not limited to the above-described embodiments, and that various modifications may be made without departing from the scope of the invention.

[0023]

As described above, according to the present invention, the A / D
It is possible to reduce the speed required for the conversion circuit and its peripheral circuits, and to provide a signal recording / reproducing system capable of simultaneously recording a plurality of different signals on a storage device having only one input channel. .

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing a circuit configuration of an embodiment of a signal recording / reproducing system according to the present invention.

FIG. 2 is a diagram showing how signal frequency conversion is performed in the embodiment.

[Explanation of symbols]

11, 121 to 12n ... Input terminal, 13 ... Distribution circuit, 1
41 to 14n ... Switch, 151 to 15n ... Frequency conversion circuit, 161 to 16n ... A / D conversion circuit, 17 ... Recording control circuit, 18 ... Storage device, 19 ... Reproduction control device, 201
20n ... D / A conversion circuit, 211-21n ... Frequency conversion circuit, 22 ... Combining circuit, 23, 241-24n ... Output terminal.

Claims (2)

[Claims] 1. A distribution circuit for distributing one input analog signal to a plurality of channels, and a plurality of recording frequency converters provided for each distribution channel of the distribution circuit and converting the input signal into a narrow band signal at a low frequency. Circuits, a plurality of analog / digital conversion circuits for converting the outputs of these conversion circuits into digital signals, a storage control circuit for synchronizing and serializing the outputs of these conversion circuits, and recording the circuit outputs Storage device, a playback control circuit for parallelizing the playback output of this storage device into a plurality of channel signals, and a plurality of digital / analog converters provided for each output channel of this circuit and converting to corresponding channel signals. The conversion circuits, a plurality of reproduction frequency conversion circuits that return each output of these conversion circuits to the original frequency band, and the outputs of these conversion circuits. Signal recording and reproducing method comprising a combining circuit for combining the. 2. A plurality of switches for deriving analog signals of a plurality of channels to the plurality of recording frequency conversion circuits instead of the distribution output of the distribution circuit, each of the plurality of reproduction frequency conversion circuits. 2. The signal recording / reproducing system according to claim 1, wherein the output is directly derived.