JPH0115221B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention enables an audio storage device in a store-and-forward system to erase unnecessary PB signals (push button signals) and store only audio signals.
This relates to a PB signal erasure control method.

Prior Art and Problems In a store-and-forward system, an audio storage device is provided, which stores audio signals in response to requests from subscribers, and reproduces and transmits the stored contents in response to requests from other subscribers. It is something that can be done. In such a storage device, in order to reduce the storage capacity, silent portions are compressed, and furthermore, a band compression means is used to reduce the amount of stored data. Furthermore, with the development of switching networks, it has become possible to control various devices in the home from outside the home using a telephone or the like. Similarly, even during audio storage operation, the PB signal can be used as a control signal to perform controls such as temporary stop. When such a PB signal is accumulated together with the audio signal, the reproduced audio becomes harsh, and furthermore, the reproduced PB signal acts as a control signal,
There is a risk of unexpected malfunction.

OBJECTS OF THE INVENTION The object of the present invention is to erase unnecessary PB signals when storing audio signals so that only audio signals can be stored.

Structure of the Invention The present invention includes a first silencing circuit that converts received accumulated data into silent data based on a PB signal detection signal from a PB signal receiver, and an output signal of the first silencing circuit that converts the output signal of the first silencing circuit into the PB signal. a delay circuit that delays a time corresponding to the dead time of the signal receiver; and a second silence circuit that converts the output signal of the delay circuit into silence data using the detection signal of the PB signal; The output signal of the silencing circuit is stored in a storage device, and an embodiment thereof will be described in detail below.

Embodiment of the Invention FIG. 1 is a block diagram of main parts of an embodiment of the present invention, in which 1 and 3 are first and second silencing circuits, 2 is a delay circuit, 4 is a storage circuit, and 5 is a timing control circuit. 6 is a PB signal receiver, and 7 is an accumulation control circuit. In a system in which the audio storage device is connected via a digital highway, the input signal a
is, for example, digital data of 8 bits per time slot based on a companding law such as μ-law, and is applied to the first silencing circuit 1 and the PB signal receiver 6.

The PB signal receiver 6 detects the PB signal and applies the detection signal b to the first and second silencing circuits 1 and 2 and the accumulation control circuit 7, and also outputs the received PB signal as the PB code f to the accumulation control circuit. This is in addition to 7. In this case, there is a dead time T (usually 20 to 40 mS) to distinguish between the audio signal and the PB signal, and the detection signal b is output after the dead time T after the PB signal is input. Become something. or
The detection signal b is continuously output for a short time after the PB signal disappears. Further, the timing control circuit 5 generates a timing signal specifying a time slot and applies it to the first and second silencing circuits 1 and 3. Further, the delay circuit 5 is
It has a delay time corresponding to the dead time T of the PB signal receiver 6.

When the PB signal receiver 6 detects the PB signal and outputs the detection signal b, the first silence circuit 1 converts the data input during the period of the detection signal b into silent data based on the detection signal b. It is converted and transferred to the delay circuit 2. In the second silence circuit 3, since the PB signal of the time corresponding to the dead time T of the PB signal receiver 6 remains in the data delayed by the delay circuit 2, this PB signal is converted into silent data. Convert to Therefore, the storage circuit 4 stores only the audio signal from which the PB signal has been completely removed.

Figures 2 a to e show examples of signals a to e of each part in Figure 1, where a PB signal is inserted between voice data and the input signal a is as shown in a. Expressed as an analog signal, the PB signal receiver 6 detects the PB signal, outputs the detection signal b as shown in b after the dead time T, and connects the first silencing circuit 1 and the second silencing circuit 1 to the second silencing circuit 1. Circuit 3 and accumulation control circuit 7
Add to. The first silencing circuit 1 identifies the time slot of the PB signal based on the timing signal from the timing control circuit 5, converts the PB signal into silent data based on the detection signal b, and outputs it. As shown in c, this output signal c remains for a dead time T of the PB signal receiver 6 without being erased.

This output signal c is delayed by the delay circuit 2 for a time corresponding to the dead time T, and the output signal d
is shown in d. Therefore, it remains
Since the PB signal has been delayed by the period in which the detection signal b from the PB signal receiver 6 exists, the remaining PB signal is converted into silent data in the second silence circuit 3, and the remaining PB signal is converted into silent data. The output signal e is as shown in e. That is, the PB signal is completely erased, and only the audio signal is stored in the storage device 4. Also, PB from PB signal receiver 6
The code f is applied to the accumulation control circuit 7, and controls such as temporary stopping of the accumulation operation are performed.

The storage device 4 compresses silent data and compresses and stores sound data using an arbitrary compression means. Also, the stored data is reproduced and sent out upon request, and the sending route is not shown.

Effects of the Invention As explained above, the present invention includes a first silencing circuit 1 that converts received accumulated data into silent data using a PB signal detection signal f from a PB signal receiver 6; A delay circuit 2 delays the output signal c of the silencing circuit 1 by a time corresponding to the dead time T of the PB signal receiver 6, and the output signal d of the delay circuit 2 is converted into silent data by the detection signal f of the PB signal. The output signal e of the second silence circuit 3 is stored in the storage device 4, and by converting the PB signal into silence data, the storage Since only audio data is stored in the device 4, when the stored contents are played back, no unpleasant PB signals are included, and there is no possibility of the sound data acting as a control signal. Furthermore, since it becomes possible to perform silence compression, it can also contribute to increasing the compression rate of audio data.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a main part of an embodiment of the present invention, and FIGS. 2 a to 2 e are explanatory diagrams of the operation. 1 and 3 are first and second silence circuits, 2 is a delay circuit, 4 is a storage circuit, 5 is a timing control circuit,
6 is a PB signal receiver, and 7 is an accumulation control circuit.

Claims (1)

[Claims] 1 The first step converts the received accumulated data into silent data using the PB signal detection signal from the PB signal receiver.
a silencing circuit; a delay circuit for delaying the output signal of the first silencing circuit by a time corresponding to the dead time of the PB signal receiver; A PB signal erasure control method comprising: a second silencing circuit for converting into silent data; and storing an output signal of the second silencing circuit in a storage device.