JP2625802B2 - Recording and playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus suitable for recording and reproducing a broadcast program such as a weather forecast and news broadcast on a regular basis.

[Summary of the Invention]

According to the present invention, a memory for recording and reproducing an input analog signal converted into a digital signal is provided, the recording time of the memory is set, and the reproduction start time is arbitrarily set. By playing back from the point, if the playback start instruction is given even during recording, the contents can be played back from the start of recording or any time, and the information at any time can be immediately grasped immediately It is intended to make possible the effective use of the circuit.

[Conventional technology]

For example, a recording / reproducing device such as a tape recorder with a timer function is currently used in order to always keep the latest information when recording a broadcast program such as a weather forecast or news broadcast at a regular time.

Further, a recording / reproducing apparatus using a semiconductor memory has been proposed in order to prevent a head break at the time of reproducing recorded information (JP-A-61-225930).

[Problems to be solved by the invention]

By the way, in the case of a conventional recording / reproducing apparatus such as a tape recorder with a timer function as described above, it is inconvenient because reproduction cannot be performed until a predetermined recording operation is completed. It could not be used effectively.

Further, in the case of a conventional recording / reproducing apparatus using a semiconductor memory, since the semiconductor memory is always used to prevent a break in the head, there is a disadvantage that it is not possible to reproduce already recorded information or information recorded immediately before recording. there were.

The present invention has been made in view of the above points, and an object of the present invention is to provide a recording / reproducing apparatus which can reproduce information already recorded or information recorded immediately before at any point while recording.

[Means for solving the problem]

A / D converter (7) for converting an input analog signal into a digital signal, memory (9) for recording and reproducing a digital signal from A / D converter (7) for a predetermined time, and reproduction from memory (9) A digital-to-analog converter (10) for converting the converted digital signal into an analog signal, a clock signal generator (14) for generating a clock signal of a predetermined frequency, and the clock signal being supplied to the memory (9). Control signal,
Control means (8) and (15) for generating a read control signal and an address control signal and alternately outputting a write control signal and a read control signal to the memory (9) for each cycle of the clock signal having the predetermined frequency. ) To (18),
Timer means (19) for presetting a recording time in the memory (9) by the write control signal; address setting means (20) for setting an arbitrary read address of the digital signal recorded in the memory (9) for a predetermined time; (21), and the control means (8) and (15) to (18) generate an address control signal from the start of setting of the timer means (19) to the end of setting, and record the address control signal in the memory (9). The digital signal obtained is reproduced simultaneously with recording from the address set by the address setting means (20) and (21).

[Action]

The recording time in the memory (9) is set in advance by the timer means (19), and the A / D-converted input signal is stored in the memory (9) by the control means (8) and (15) to (18) for the set time. 9), the digital signal recorded in the memory (9) is converted by the control means (8) and (15) to (18) from an arbitrary address set by the address setting means (20) and (21). It is played back simultaneously with recording. As a result, information at any time can always be immediately grasped, and the circuit can be effectively used.

〔Example〕

Hereinafter, an embodiment in which one embodiment of the present invention is applied to a radio receiver will be described in detail with reference to FIGS. 1 to 3.

FIG. 1 shows a circuit configuration of the present embodiment. In FIG. 1, (1) is a receiving antenna, (2) is a high-frequency circuit,
(3) is a mixing circuit, (4) is a local oscillation circuit, (5) is an intermediate frequency circuit, and (6) is a detection circuit.

Audio signal (analog signal) from the detection circuit (6)
Is supplied to an A to D converter (7), where it is converted into a digital signal based on a control signal from a microcomputer (8), and is stored in a predetermined position of a memory (9) in a recording mode. Is recorded according to an address signal from the microcomputer (8).

The digital signal recorded in the memory (9) is read from a predetermined position in accordance with the analog signal from the microcomputer (8) in the reproduction mode, and is supplied to the D / A converter (10). The signal is converted into an analog signal based on the control signal, supplied to a low-frequency circuit (12) via a switch circuit (11), amplified, and emitted from a speaker (13). The switch circuit (11) is controlled by a control signal from the microcomputer (8). In the normal mode, the switch circuit (11) is connected to the contact N side, and passes an output signal from the detection circuit (6) to the low-frequency circuit (12) to perform special operation. In the mode, it is connected to the contact S side and outputs the output signal from the D / A converter (10) to the low-frequency circuit (1
2) Work to pass.

(14) is a clock generating circuit for generating a clock signals S ₁ as shown in FIG. 2 A, from the frequency of the clock signals S ₁ from the clock generator circuit (14) is A / D converter (7) the frequency of the digital signal is set to f _s to the example 2f _s. Clock signals S ₁ is supplied as the master clock signal to the microcomputer (8) is supplied as the chip Zener Bull (CE) signal to the memory (9).
The clock signals S ₁ the AND circuit (15) is supplied to the (16) one of the 1/2 frequency divider is supplied to an input terminal (17), whose output is 1/2 frequency-divided here signal S ₂ as shown in FIG. 2 B on the side is obtained. The signal S ₂ is supplied directly to the other input terminal of the AND circuit (16) is supplied through an inverter (18) to the other input terminal of the AND circuit (15). Therefore, the AND circuit (15) and (16) respectively to the output side of Figure 2 C and signals S ₃ and S ₄ as shown in D is obtained. Signal S ₃ is the memory (9) is supplied as a read enable (RE) signal, the signal S ₄ is supplied as a write enable (WE) signal to the memory (9). Therefore,
Memory (9) becomes the read mode at the rising edge of the signal S _2,
At the fall, the mode is the write mode.

(19) a timer for selectively setting the recording time of the memory (9), (20) a console having a plurality of operation keys, (2)
Reference numeral 1) denotes a reproduction start address setting circuit for arbitrarily setting the reproduction start time of the memory (9).

If the recording time of the memory (9) is set in advance from what time to what time with the timer (19), the timer (1
An address signal is supplied from the microcomputer (8) to the memory (9) in response to a command from 9), and a digital signal from the A / D converter (7) is recorded at a predetermined position in accordance with the address signal. I do.

On the other hand, when, for example, a first operation key (not shown) of the console (20) is pressed, the command signal is supplied to the reproduction start address setting circuit (21), where the digital signal recorded in the memory (9) is stored. For example, the address is set so as to be read from the first address, and the memory (9)
Is read from the first address of the digital signal recorded in the.

When a second operation key (not shown) of the console (20) is pressed, for example, the command signal is supplied to the reproduction start address setting circuit (21), where the digital signal recorded in the memory (9) is sent. For example, an address is set so as to be read from the tenth address of the digital signal, and an address signal from the microcomputer (8) based on the address setting makes it possible to read the digital signal already recorded in the memory (9) from the tenth address. Done.

As described above, the operation console (20) is provided with a plurality of operation keys corresponding to the reproduction address so that the recorded information can be reproduced from an arbitrary point. At the time of reproduction, these operation keys are arbitrarily selected. do it.

The memory (9) may be any memory having a storage function, such as a semiconductor memory, a solid-state memory, a magnetic disk, and an optical disk.

Now, when the microcomputer (8) connects the switch circuit (11) to the contact N side and is in the normal mode, the audio frequency signal from the detection circuit (6) is directly supplied to the low frequency circuit (2). It is amplified and emitted from the speaker (13).

On the other hand, when the switch circuit (11) is connected to the contact S side by the microcomputer (8) to set the special mode,
Since a digital signal (recording data) as shown in FIG. 3A is supplied from the A / D converter (7) to the memory (9), when the time set by the timer (19) is reached, this digital signal Is recorded at a predetermined position in the memory (9) based on an address signal from the microcomputer (8).

Then, when, for example, the first operation key of the console (20) is pressed during the recording, the first address position of the record information is set by the reproduction start address setting circuit (21), and the microcomputer based on this address position setting is set. The digital signal is sequentially read from the first address position already recorded by the address signal from (8), and a digital signal (reproduction data) as shown in FIG. 3B is taken out from the memory (9). The signal is converted into an analog signal by a D / A converter (10), passes through a switch circuit (11) and a low-frequency circuit (12), and is emitted from a speaker (13).

Of course, any operation key may be pressed on the console (20) to reproduce the recorded information from any point.

In this manner, in this embodiment, the information already recorded can be reproduced and heard from any point at the same time as recording.
Since the reproducing circuit such as the low frequency circuit (12) can be operated during recording, the circuit can be used effectively.

In the above-described embodiment, other information already recorded is reproduced during recording. However, the recorded information may be reproduced simultaneously with recording. In the above-described embodiment, the case where the audio signal is substantially recorded and reproduced is described. However, the present invention can be similarly applied to the case where the other signals such as the video signal are recorded and reproduced.

〔The invention's effect〕

As described above, according to the present invention, the recording time of the memory is set and the reproduction start time is arbitrarily set, so that the recorded information can be reproduced from any point while recording. By instructing the start of reproduction, the contents can be reproduced from the start of recording or from an arbitrary point in time, so that the information at any point in time can be immediately grasped and the circuit can be effectively used.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIGS. 2 and 3 are signal waveform diagrams for explaining the operation of FIG. (7) is an A / D converter, (8) is a microcomputer,
(9) is a memory, (10) is a D / A converter, (19) is a timer, (20) is a console, and (21) is a reproduction start address setting circuit.

Claims (1)

(57) [Claims] An A / D converter for converting an input analog signal into a digital signal; a memory for recording and reproducing a digital signal from the A / D converter for a predetermined time; and a digital signal reproduced from the memory. A D / A converter for converting to an analog signal; a clock signal generator for generating a clock signal of a predetermined frequency; and the clock signal being supplied to generate a write control signal, a read control signal, and an address control signal for the memory. Control means for alternately outputting the write control signal and the read control signal to the memory for each cycle of the clock signal having the predetermined frequency; and a preset recording time for the memory by the write control signal. Timer means for setting an arbitrary read address of a digital signal recorded in the memory for a predetermined time; Setting means, wherein the control means generates the address control signal from the start of setting to the end of setting of the timer means, and converts the digital signal recorded in the memory from the address set by the address setting means. A recording / reproducing apparatus characterized in that reproduction is performed simultaneously with recording.