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# SHCatalog

An abstract base class for storing reference signatures and their associated metadata.

```
class SHCatalog
```

## Overview

This is the base class of your custom catalog.

## Topics

### Accessing catalog properties

[`var maximumQuerySignatureDuration: TimeInterval`](/documentation/ShazamKit/SHCatalog/maximumQuerySignatureDuration)

The maximum duration of a query signature that you use to match reference signatures in the catalog.

[`var minimumQuerySignatureDuration: TimeInterval`](/documentation/ShazamKit/SHCatalog/minimumQuerySignatureDuration)

The minimum duration of a query signature that you use to match reference signatures in the catalog.

## Relationships

### Inherits From

[`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class)

### Conforms To

[`CVarArg`](/documentation/Swift/CVarArg)

[`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible)

[`Hashable`](/documentation/Swift/Hashable)

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

[`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible)

[`Equatable`](/documentation/Swift/Equatable)

### Inherited By

[`SHCustomCatalog`](/documentation/ShazamKit/SHCustomCatalog)

---

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