JPH0438605Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a receiver that can record the sound received by a radio receiver or the like and play back the recorded information at any time. This relates to a receiver that can play back music.

[Prior Art] Conventionally, when listening to news etc. using a radio receiver or the like, important information may be missed due to slight inattention. This is particularly troublesome and occurs frequently during work such as driving a car.

One possible solution to this problem is to record the received information on an endless tape, but this has the drawback that the current radio broadcast cannot be heard during playback.

Also, JP-A-53-55906 and JP-A-61-
As described in Publication No. 79323, the audio signal is
A receiver has also been proposed that performs AD conversion and compresses recording, and can play back content from the past for a predetermined period of time when a playback request is received.

According to this receiver, since the current broadcast is sequentially compressed and recorded at the same time as it is reproduced, it is possible to switch to the original broadcast reception state without interrupting the broadcast content. However, since the time to go back in time is constant,
It is not always possible to reproduce the desired information.
Therefore, for example, if you want to listen to a broadcast from 2 seconds ago,
There was a case where if the video was played back from 10 seconds earlier, 8 seconds of time would be wasted.

[Problems to be Solved by the Invention] As described above, conventional receivers have the problem that desired information cannot be quickly reproduced because the past content is reproduced for a certain period of time.

This invention was made in order to solve the above-mentioned problems, and the purpose is to obtain a receiver that can easily and quickly reproduce desired information.

[Means for Solving the Problems] A receiver according to this invention includes a delay recording circuit that constantly records a compressed signal of a received audio signal and outputs a plurality of output signals with different delay times; a first selector switch that selects the output signal; a restoration circuit that restores the selected output signal to a reproduced audio signal; a second selector switch that selects and outputs the received audio signal or the reproduced audio signal; a playback switch for selecting one of the playback audio signals and outputting the selected one as a playback audio signal; and controlling a second changeover switch so that the on operation of the playback switch selects the playback audio signal; A control circuit is provided for controlling the first changeover switch to sequentially select adjacent output signals.

[Operation] In this invention, by repeating the ON operation of the playback switch, for example, playback audio signals going back in time are sequentially selected and output.

[Example] Hereinafter, an example of this invention will be described with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of this invention. In the figure, 1 is a receiving circuit for receiving radio waves A, 2 is a detection circuit for detecting the received radio waves, 3 is an amplifier circuit for amplifying the received audio signal B detected by the detection circuit 2, and 4 is an amplification circuit. circuit 3
A speaker that outputs an audio signal C via
These are well known configurations of conventional radio receivers.

5 is an AD converter as a conversion circuit for converting the received audio signal B into a digital conversion signal D suitable for recording, and includes a sample hold circuit and a low frequency circuit for preventing aliasing. For example, when converting to an 8-bit pulse code at a sampling frequency of 8KHz, the received audio signal B becomes a converted signal D with an information content of 64K bits/second, so the passband of the wave circuit is 4KHz or less. .

6 includes a circuit for omitting silent parts, etc., and converts the converted signal D into a temporally compressed digital compressed signal E.
7 includes a shift register (or digital memory) and a shift clock;
This is a delay recording circuit that records the compressed signal E every sampling period and outputs the delayed signal.

Note that information exceeding the memory capacity of the delay recording circuit 7 is discarded one by one, and only the compressed signal E corresponding to the most recently received received audio signal B is always recorded in the delay recording circuit 7. For example, 125μs sampling period (8KHz sampling frequency)
If the received audio signal B is converted to an 8-bit conversion signal D and the memory capacity of the delay recording circuit 7 is 512K bits, the delay recording circuit 7 records the latest received audio signal B for 8 seconds. There will be. However, if the memory capacity is increased, it is possible to record the converted signal D of any length, not just 8 seconds.

F1 to F4 are a plurality of output signals from the delay recording circuit 7;
This corresponds to a delay time of 4, 6, or 8 seconds. Note that the number of output signals is not limited to four, and the delay times may not be at equal intervals.

8 is a plurality of input contacts 8a to 8d and an output contact 8
is a first changeover switch having an input contact 8
One of the output signals 7a to 7d is selected via a to 8d, and outputted as a selection signal G from an output contact 8e.

9 is a restoration circuit that converts the selection signal G into an analog playback audio signal H at each sampling period.
It is a DA converter and includes a data latch circuit and a smoothing low-frequency circuit.

10 is a second changeover switch inserted between the detection circuit 2 and the amplifier circuit 3, and one input contact 1
0a selects the received audio signal B, the other input contact 10b selects the reproduced audio signal H, and outputs the output contact 10c to the amplifier circuit 3.

11 is a control circuit including a microcomputer, an operation program memory, etc., and a compressed signal E.
and the selection signal G, and outputs a first control signal J1 for controlling the first changeover switch 8 and a second control signal J2 for controlling the second changeover switch 10. .

Reference numeral 12 denotes a regeneration switch connected to the control circuit 11, which is closed by the user when a regeneration request is made.

Next, the operation of the embodiment of this invention shown in FIG. 1 will be explained with reference to the flowchart shown in FIG.

When the power is turned on, the second selector switch 10 selects the received audio signal B on the output side of the detection circuit 2 (step S1), outputs it as the audio signal C from the amplifier circuit 3, and transmits normal radio broadcasts to the speaker 4. Output from.

Further, the received audio signal B is converted into a digital conversion signal D by the AD converter 5, and becomes a compressed signal E which is temporally compressed by the compression circuit 6.
The converted signal D is recorded in the delay recording circuit 7 at every sampling period, and the converted signal D exceeds the memory capacity for 8 seconds or more.
is thrown away.

Next, the control circuit 11 determines whether or not the regeneration switch 12 is closed (on) (step
S2), if it is not turned on, continues outputting the normal received audio signal B.

Here, when the user turns on the playback switch 12, the recording and playback control state is entered, the second changeover switch 10 selects the playback audio signal H on the output side of the DA converter 9, and the first changeover switch 8 selects the playback audio signal H on the output side of the DA converter 9. The previous output signal F1 is selected (step S3).

At this time, the output signal F1 consisting of digital information
is output from the delay recording circuit 7 at every sampling period of the DA converter 9, and is input to the DA converter 9 via the first changeover switch 8. Then, the output signal F1 from two seconds ago becomes an analog reproduced audio signal H, is amplified by the amplifier circuit 3, and is output from the speaker 4.

Further, simultaneously with the reproduction operation, the contents currently being broadcast are sequentially recorded in the delay recording circuit 7 in the same manner as described above. At this time, while the input information of the delay recording circuit 7 is compressed, the output signal F1 is always output one clock at a time, so the amount of recorded information gradually decreases, and finally the delayed The reproduced audio signal H and the received audio signal B match.

In order to detect this, the control circuit 11 determines whether the compressed signal E and the selection signal G passed through the first changeover switch 8 match (step S4), and when they match, the process returns to step S1 to perform the normal operation. to receive broadcasts. Thereby, the user can listen to the current broadcast content continuously after listening to the past broadcast content.

On the other hand, if no match is found, the step
Proceeding to S5, it is determined whether the playback switch 12 has been turned on again. If it is not turned on, the process returns to step S4, and the reproduced audio signal H is output until the reproduced audio signal H matches the received audio signal B.

On the other hand, if the user finds that the output signal F1 from two seconds ago is not the information desired by the user, the user turns on the reproduction switch 12 again.

Therefore, the control circuit 11 determines whether the regeneration switch 12 is on or not, and the output contact 8 of the first changeover switch 8
Connect e to input contact 8b. As a result, information on the output signal F2 from two seconds ago, that is, four seconds ago, is output (step S6).

Thereafter, each time the playback switch 12 is turned on, steps S5 and S6 are repeated, the output contact 8e is connected to the input contact 8c or 8d, and the information of the output signal F3 from 6 seconds ago or the output signal F4 from 8 seconds ago is output. be done.

In this way, the information going back to the past is sequentially output by turning on the playback switch 12.
The user can easily and quickly obtain the information he or she wants to listen to again.

According to experiments, the appropriate time and pitch for one turn-on operation is 2 to 5 seconds, and it is easy to repeat the turn-on operation up to 5 times.
It was also found that the time required to determine whether the reproduced audio signal is appropriate or not is several seconds.

In the above embodiment, the audio signal B is digitized and recorded in the delay recording circuit 7.
A BBD element, a CCD element, or the like may be used to record an analog signal at each sampling time.

Moreover, although the case where the receiver is a radio receiver has been described as an example, it goes without saying that the same effect can be achieved even if the present invention is applied to other radio receivers.

Further, each time the playback switch 12 is turned on, the output signals F1 to F4 are sequentially selected, but the output signals F1 to F4 may be selected in reverse order from past information.

[Effects of the invention] As described above, this invention includes a delay recording circuit that constantly records a compressed signal of a received audio signal and outputs a plurality of output signals with different delay times, and a delay recording circuit that selects the plurality of output signals. a restoration circuit that restores the selected output signal to a reproduced audio signal; a second selection switch that selects and outputs the received audio signal or the reproduced audio signal; and a selection of one of the plurality of output signals. and a playback switch for outputting the reproduced audio signal as a playback audio signal, a second changeover switch is controlled to select the playback audio signal by the ON operation of the playback switch, and the first changeover switch is controlled to select the playback audio signal depending on the number of repetitions of the ON operation. A control circuit is provided to sequentially select adjacent output signals, and each time the playback switch is turned on, the playback audio signals shifted in time are sequentially selected and output. This has the effect of providing a receiver that can easily and quickly reproduce information.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of this invention, and FIG. 2 is a flow chart for explaining the operation of FIG. 1. 5... AD converter, 6... Compression circuit, 7... Delay recording circuit, 8... First changeover switch, 9...
DA converter, 10...Second changeover switch, 11...
...control circuit, 12...playback switch, B...received audio signal, D...conversion signal, E...compression signal, F
1 to F4...Output signal, H...Playback audio signal, J
1, J2... Control signals. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) A conversion circuit for converting a received audio signal into a converted signal suitable for recording, a compression circuit for converting the converted signal into a compressed signal compressed in time, and a delay recording circuit that constantly records a compressed signal and outputs a plurality of output signals with different delay times; a first changeover switch that selects the plurality of output signals; and a first switch that restores the selected output signal to a reproduced audio signal. a restoration circuit; a second selector switch that selects and outputs the received audio signal or the reproduced audio signal; and a reproduction switch that selects one of the plurality of output signals and outputs it as a reproduced audio signal. , the second changeover switch is controlled to select the reproduced audio signal by the ON operation of the playback switch, and the first changeover switch is controlled to sequentially select adjacent output signals depending on the number of repetitions of the ON operation. and a control circuit for controlling the receiver. (2) The conversion circuit is an AD converter, and the restoration circuit is
The receiver according to claim 1, which is a DA converter. (3) Utility model registration claim 1, characterized in that the control circuit controls the first changeover switch so that it sequentially selects previously output signals each time the playback switch is turned on. Or the receiver described in paragraph 2.